Abstract: A heat storage type air conditioner which is free from a difficulty that, when a general cooling and heating circuit and a cold radiating and heat radiating circuit are operated separately or simultaneously, the quantities of refrigerant in those circuits become smaller or larger than required, so that its compressor is damaged or the cooling or heating capacity is lowered. When, in a heat storage type air conditioner, first and second bypass circuits 22 and 23 are closed, a general cooling and heating circuit 18 driven by a compressor 1 and a cold radiating and heat radiating circuit 21 driven by a refrigerant gas pump 13 are made independent of each other, so that a cooling operation or a heating operation is carried out with the aid of a first use-side heat exchanger 4a and a second use-side heat exchanger 4b. Therefore, in the air conditioner, the refrigerant or refrigerating machine oil will never concentrate in any one of the two circuits.

Abstract: An air conditioner employs a refrigerating cycle involving a compressor 1, an outdoor heat exchanger 5, an indoor heat exchanger 9, an expansion valve 7, and a non-azeotropic coolant mixture composed of high and low boiling coolants sealed in the refrigerating cycle. The outdoor heat exchanger 5 is provided with a first blower 15 and a second blower 17. A speed controller 18 drives and controls the first, and second blowers 15 and 17. The speed controller 18 achieves a first mode to decrease an air quantity to part of the outdoor heat exchanger located on the upstream side of a flow of the coolant smaller than an air quantity to part of the outdoor heat exchanger located on the downstream side of the flow of the coolant, and a second mode to increase the air quantity to the upstream side of the outdoor heat exchanger greater than the air quantity to the downstream side of the outdoor heat exchanger.

Abstract: An air conditioner is selectively operable in a main heating mode, a cooling mode and an auxiliary heating mode. In the main heating and cooling modes, refrigerant is circulated through a main line which includes a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. In the auxiliary heating mode, the compressor is not activated, and the refrigerant is circulated through an auxiliary line having opposite ends connected by valves to the main line at opposite sides of the indoor heat exchanger. A pump and heater are disposed in the auxiliary line so that in the auxiliary heating mode, refrigerant is circulated by the pump through the heater and the indoor heat exchanger and back to the pump.

Abstract: A heat pump and air conditioning system is provided with a thermal storage device, a variety of distribution devices for blocking or allowing flow of the system working fluid, and a controller for manipulating the distribution devices to control flow of the working fluid through the thermal storage device to allow thermal energy storage or thermal energy discharged depending upon sensed conditions. In addition, a thermal storage device is provided which is suitable for use in a heat pump and air conditioning system. The thermal storage device includes a container through which refrigerant coils pass. The container is filled with an unencapsulated phase change material having a first melt temperature and an encapsulated phase change material having a second melt temperature higher than the first melt temperature. Further disclosed is a method for conditioning a space by use of heat pump and air conditioning systems incorporating thermal storage.

Abstract: A heat-pump type air-conditioner includes a potentiometer provided to output a voltage corresponding to a position of a slidable terminal movable on a register element. Based on the magnitude of the output voltage, one of a cooling mode, a stop mode and a heating mode is set, as is the speed of the compressor consequently, both the modes selection and the temperature control can be performed with one switch operation.

Abstract: In a heat pump system having supplemental heat for application to the supply air during periods of defrost operation, a "cold blow" condition is avoided by turning on a supplemental heater and by sensing the temperature of the supply air and responsively turning on additional heat in stages when necessary to maintain the temperature level of the supply air at a comfortable level.

Abstract: According to this invention, a plurality of indoor units each having an indoor heat exchanger are connected to a heat source unit having a compressor and a water heat exchangers, thereby constituting a multi-type air-conditioning apparatus. The heat source unit has an operation switch operated when a refrigerant amount is to be checked. When the operation switch is turned on, the refrigerant discharged from the compressor is circulated in only the heat source unit. At this time, the temperature of predetermined positions in the heat source unit is detected by a temperature sensor, and it is determined, in accordance with the detection temperature, whether the refrigerant amount in a refrigerating cycle is normal or abnormal. The determination result is displayed on a display unit of the heat source unit.

Abstract: A method of starting a compressor of an air conditioner involves raising the operation frequency of the compressor from zero to a target operation frequency in different patterns (stages), depending upon (1) whether the air conditioner is being operated in a heating mode or a cooling mode, and (2) whether, during a heating mode, the target operation frequency is in a high range, a medium range, or a low range. During a heating mode at either of the high and medium target frequency ranges, the compressor frequency is increased and decreased on its way to reaching the target operation frequency.

Abstract: A "DX" heat pump is provided herein which is based on the principle of providing optimal heat exchange in the heating mode through three parallel ground loops, two of which can be cut off from the system and evacuated of refrigerant in the cooling mode. The loops are designed in terms of volume so that the refrigerant charge is correct in the heating mode when split in three loops and also correct in the cooling mode when only one loop is used, but it contains the full system refrigerant charge.

Abstract: Refrigerant is metered through the expansion valve based on compressor discharge temperature and ambient air temperature measurements. The microprocessor-based control system selects the appropriate stepper motor valve setting to achieve optimal performance. The temperature measurements used in the control system are decoupled from fluctuations due to shifting of the refrigerant dry out point. This allows the system to be operated at much lower superheat temperatures than heretofore attained, yielding improved performance and longer component life.

Abstract: An electric expansion valve is arranged between a first indoor heat exchanger and a second indoor heat exchanger. At a time of cooling operation, the electric expansion valve is fully opened to connect both the indoor heat exchangers to each other. At a time of dehumidifying operation the electric expansion valve is narrowed to apply a pressure reducing action across these indoor heat exchangers so that the first indoor heat exchanger acts as a reheater and the second indoor heat exchanger as an evaporator. The indoor air is cooled and dehumidified by the second heat exchanger and then reheated by the first indoor heat exchanger and blown into the room. At a time of dehumidifying operation, the temperature of the air blown into the room varies by controlling the speed of an outdoor fan.

Abstract: The microprocessor-based control system selects the appropriate indoor airflow (fan speed) to place the system in an optimal efficiency range. The indoor fan speed is further controlled based on humidity measurements, to produce a slower airflow when conditions are humid. This helps remove a greater amount of moisture from the air. Occupant comfort is enhanced by microprocessor control of the indoor fan speed to stay within the boundaries of the cooling mode comfort envelope.

Abstract: An air conditioning apparatus suitable for an electric car without a hot water source, while preventing the windshield from fogging up when switching from a cooling or dehumidifying operation to a heating operation. Upon the commencement of a heating operation following the end of a preceding cooling or dehumidifying operation lasting for a period longer than a predetermined value, a switching damper 104 is forced to move to the outside air inlet position 104A, when it is determined that a predetermined first time has not elapsed from the end of the last cooling or dehumidifying operation, and a predetermined second time has not elapsed from the commencement of the first heating operation following the end of the last cooling or dehumidifying operation.

Abstract: An air conditioning apparatus which includes a single heat source device and plural indoor units including indoor heat exchangers. Some of the indoor units include a fan for introducing outdoor air, while others include a fan for circulating indoor air. In addition, a controller is provided for controlling operation of one or more of the indoor units to carry out heating, cooling or ventilation in response to a determination of the operation of one or more other indoor units.

Abstract: An air conditioning system includes: a compressor, an outside air heat exchanger, an outside air heat exchanger fan, an expansion valve, an interior heat exchanger, an interior heat exchanger fan, and a four-way switching valve further comprises an outside air induction/venting device provided outside the outside air heat exchanger. A device for switching or opening/closing the air intakes and/or outlet of the outside air heat exchanger are provided in the outside air induction/venting device and are operated to enable the efficient use of waste heat from the drive shaft motor or inside the passenger compartment, and to provide a defrost cycle in the heat pump heating mode.

Abstract: An air-conditioning system for a cooling operation and a heating operation comprises a first heat exchanger to which a high-pressure and high-temperature refrigerant which has not been substantially cooled and adiabatically expanded after being compressed is supplied to heat the inside of a room to be air-conditioned during both of the cooling operation and the heating operation, a second heat exchanger to which a low-pressure and low-temperature refrigerant which has been substantially cooled and adiabatically expanded after being compressed is supplied to cool the inside of the room during both of the cooling operation and heating operation, and an air flow generator for generating an air flow which passes the first heat exchanger and the second heat exchanger, wherein the second heat exchanger is arranged at an upstream side of the first heat exchanger in the air flow.

Abstract: A system for sending programs for controlling an air conditioner, comprising at least one indoor unit and an outdoor unit connected to the indoor unit, the outdoor unit including a first memory for storing a program for controlling the room condition, a second memory for storing a program for controlling the outdoor unit in cooperation with the room condition control program, and a communication circuit for sending contents of the program in the memory to the indoor unit, the indoor unit including a third memory for storing a receiving execution program for executing the receiving of the room condition control program from the outdoor unit, a communication circuit for receiving the program from the outdoor unit, and a fourth memory for storing the program received. The third memory has stored therein the receiving program at an address at which the execution thereof is started when power is turned on.

Abstract: An air conditioning apparatus including an indoor device having a first heat exchanger, a second heat exchanger, and a radiant panel. Air circulation mode is switched to radiant mode when a room temperature has reached a temperature set by a user. Refrigerant is changeably circulated through the first and second heat exchangers in a cooling operation so that dew is not formed on the radiant panel.

Abstract: An outdoor unit has a compressor and an outdoor heat exchanger. Each of a plurality of indoor units has an indoor heat exchanger. The outdoor unit is connected in parallel with the plurality of indoor units to form a multi-type air conditioner system having a plurality of refrigeration cycles. A plurality of gaseous flow adjustment valves are provided to the gaseous sides of the indoor units, respectively. A plurality of liquid expansion valves are provided to the liquid sides of the indoor unit, respectively. A refrigerant super-heat degree detector detects a refrigerant super-heat degree of the outdoor heat exchanger or the indoor heat exchangers.

Abstract: For use with a heat pump to increase cooling and heating efficiency, between an outdoor condenser and an indoor evaporator, a refrigerant receiver or sub-cooler is provided within the high pressure liquid refrigerant portion of the system, including at least one high flow, low pressure release check valve having an internal control element with a refrigerant turbulence producing backside that serves as an incremental expansion device to cool, by incremental expansion, and heat, by turbulence, the high pressure liquid refrigerant.

Abstract: An air conditioning apparatus (1) is disclosed which includes a pair of adjacent parallel air ducts, namely a conditioned air duct (4) and an ambient air duct (5), wherein the ducts (4,5) have a common side wall (7). A fan (14) delivers an air stream through the conditioned air duct (4) to condition the air stream. A fan 15 delivers ambient air through the ambient air duct (5). Mounted within the ambient air duct (5) is a refrigeration unit having a condenser (20) and an evaporator (21). The condenser (20) and evaporator (21) are slidable between the two ducts (4,5) along tracks (43,46) extending through openings (25,26) in the side wall (7) to condition air passed through the conditioned air duct (4) to a pre-set desired condition.

Abstract: An electronic expansion valve is provided between first and second indoor heat exchangers. At the time of cooling operation, the electronic expansion valve is fully opened with the result that the first and second indoor heat exchangers are communicated with each other. At the time of dehumidifying operation, the opening of the electronic expansion valve is decreased to apply the effect of pressure reduction between the indoor heat exchangers, so that the first indoor heat exchanger functions as a reheater and the second indoor heat exchanger functions as an evaporator. The air in the room is cooled and dehumidified by the second indoor heat exchanger and then discharged into the room after being reheated by the first indoor heat exchanger. At the time of the dehumidifying operation, controlling the speed of the outdoor fan permits the temperature of the air discharged into the room to be varied.

Abstract: A refrigeration system of the type having an economizer cycle is provided with a null cycle, in addition to heating and cooling cycles, without shutting a compressor prime mover down, to preserve air flow in a conditioned space. First, second and third controllable valves respectively: (1) select main and auxiliary condensers, (2) open and close a liquid line, and (3) open and close a line which provides a warm liquid to an economizer heat exchanger. The valves are controlled in at least one predetermined open/close pattern during a null cycle, and preferably in a plurality of selectable predetermined open/close patterns, to provide a null cycle at any instant which substantially matches the net heat gain or loss taking place in the conditioned space. Thus, the temperature of the served space will be more apt to remain in a null temperature range close to set point, providing smoother and more accurate control over the temperature of the conditioned space for longer shelf life of perishables stored therein.

Abstract: A split system ice-maker having a main unit, which houses the ice-making evaporators, and a remote unit, which houses an accumulator, a compressor and a condenser. At least two refrigeration lines are provided which connect the main unit to the remote unit. A four-way valve is located in the remote unit which directs the flow of refrigerant from the compressor to the condenser and then to the evaporator, during an ice-making mode, and additionally directs the flow of refrigerant directly to the evaporators during a harvest mode. The reversed flow in harvest mode briefly defrosts the evaporators, containing the ice-making grid, facilitating harvesting of the ice.

Abstract: In an air conditioner having a single outdoor unit and a plurality of indoor units, if at least two indoor units supply operation commands, an indoor unit allowed to be operated and an indoor unit not allowed to be operated are determined in accordance with a predetermined operation priority order. An operation standby signal is sent to the indoor unit not allowed to be operated. If the indoor unit allowed to be operated stops its operation, a new indoor unit is determined by again referring to the operation priority order. A confirmation signal is then sent to the determined new indoor unit under the standby state until then. If the indoor unit received the confirmation signal sends a response signal indicating that the indoor unit still intends to operate, then an operation permission signal is given to the new indoor unit.

Abstract: A low refrigerant charge detector is operatively connected in either the suction or discharge line of a compressor of a heat pump system, wherein the compressor is in turn connected to a reversing valve. The detector includes a pressure sensor connected in one line and transmits pressure readings to a computer. During reversal of the flow of liquid in the system by the reversing value, the time at which the pressure exceeds or drops below a predetermined value is measured. The comparison depends on if the sensor is connected in the suction line or discharge line. If the time exceeds a minimum time, a low charge of refrigerant is indicated.

Abstract: A transport refrigeration unit, and method of operating same, with the unit being associated with a vehicle having a drive engine and a cargo space to be conditioned to a predetermined set point temperature. The transport refrigeration unit includes a refrigerant compressor driven directly, or indirectly, by the vehicle engine. Sensors and control determine when the engine may be safely started and stopped under control of the transport refrigeration unit. A comparison between cargo temperature and set point temperature determines when a refrigeration cycle is required to maintain the set point temperature, and when the cargo space temperature is satisfied. The engine is started, when off, when the engine may be safely started and the cargo space requires a refrigeration cycle to maintain the set point temperature. The engine is stopped, when running, when the engine may be safely stopped and the cargo space is satisfied.

Abstract: A pool heater to be installed on a commercially available residential heat pump in order to add swimming pool heating to the basic functions of the heat pump, i.e. heating and cooling of a dwelling. This "add-on a heat pump" pool heater comprises a refrigerant-to-water heat exchanger with a water flow control and associated piping, a water temperature control, a flow detecting device and a specialized control logic which is integrated to the heat pump control. The heat exchanger is connected on the refrigerant side to the outlet of the compressor of the heat pump circuit and to the inlet of the reversing valve. On the water side, the heat exchange is connected on a diversion loop of the pool water filtration system to allow water to be heated by the refrigerant exiting the compressor. The integrated control conserves all the basic modes of the heat pump, i.e.

Abstract: Disclosed is an air conditioner and, in particular, an air conditioner which is capable of blowing out warm air in heating mode. In the air conditioner of this invention, the condenser is thermally separated into an air-upstream-side and an air-downstream-side heat exchanger, and the heat exchange capacity of the air-downstream-side heat exchanger is adjusted, so that, under preset operating conditions, the entire refrigerant in the air-downstream-side heat exchanger can be kept in the superheated-gas phase, thus making it possible to blow out warm air having a temperature higher than the condensation temperature. Further, the refrigerant temperature at the outlet of the air-downstream-side heat exchanger is measured by a temperature sensor, and the revolving speed of the compressor, the revolving speed of the fan, etc., is so controlled that the temperature measured is kept at a level higher than the condensation temperature.

Abstract: An air conditioning apparatus carrying out a refrigerant collecting operation for a given operation period before the heating operation is begun if the standby period Et from the halt of the heating operation to the restart of the heating operation greater than the prescribed period Pt, the temperature Ta in a defined space to be heated lower than the predetermined temperature value Ts1, and the external temperature Tex lower than the given temperature value Ts2 are satisfied when the restart of the heating operation is commanded.

Abstract: A method of operating a transport refrigeration system having a compressor driven by a prime mover at a selected one of high and low speeds, an evaporator, and an evaporator blower driven by the prime mover. Refrigeration control provides an error value which controls the temperature of a load space to a predetermined set point via heating and cooling modes. The method includes the steps of driving the compressor at high speed during pull down, and injecting hot gas into the evaporator when the error is reduced to a predetermined value. The prime mover is maintained at high speed, to keep evaporator air flow at a high rate, continuing a relatively rapid temperature pull-down across the entire load space. The speed of the prime mover is reduced to low speed when the error is further reduced to a second value, which also initiates suction line modulation while maintaining hot gas injection.

Abstract: A compartmentalized transport refrigeration system which holds selected set point temperatures in at least first and second served spaces via heating and cooling cycles. The system includes a refrigerant circuit having high and low pressure sides, including a compressor, a condenser, a receiver, at least first and second evaporator sections respectively associated with the first and second served spaces, an accumulator, and a mode selector valve having heating and cooling positions. Control provides a heat signal when the need for a heating cycle in one of the served spaces is detected. The receiver is connected to the low pressure side of the refrigerant circuit for a predetermined period of time in response to the heat signal. At the end of the period of time the mode selector valve is operated from the cooling position to the heating position, and the connection between the receiver and low pressure side is terminated.

Abstract: An integrated heat pump and hot water system can be operated in a space heating mode, a space cooling mode, or a water heating mode, with or without space heating or cooling. In the event that water heating is demanded without either space heating or cooling, a flow restriction arrangement in the liquid refrigerant line is actuated to limit the capacity of the compressor, and thus match the water heat exchanger capacity as much as possible. The selective restrictive arrangement has a valve arrangement selectively blocking the full flow of refrigerant along the condensed refrigerant line, and a restrictive bypass arrangement bridging around the valve arrangement. This can comprise one or more capillary tubes. A quenching branch line extends between the selective restricting arrangement and the suction line that returns evaporated refrigerant to the suction port of the compressor. This quenching branch line favorably comprises a solenoid valve and a flow restricting device connected in series.

Abstract: A method of operating a compartmentalized transport refrigeration system having first, second and third compartments respectively served by a host refrigeration unit and first and second remote refrigeration units. The method includes the steps of providing a first signal when either of the first and second remote refrigeration units is in a cooling cycle, cycling the host refrigeration unit between cooling and heating cycles to hold a selected set point temperature of a fresh load in the first compartment, in the absence of the first signal, and providing a predetermined null period between the heating and cooling cycles of the host unit when the first signal is present. In a preferred embodiment a prime mover for a refrigerant compressor is operable at a selected one of high and low speeds, with the method including the step of preventing high speed operation when any remote refrigeration unit is in a heating cycle.

Abstract: A control circuit for a cool/heat pump in which two separate motors are utilized, each with a main winding and an auxiliary winding. A single dual rated capacitor is provided in series with the auxiliary windings and an alternating current line and a selectively operative switch, which may be in the form of a thermostat, is provided in series between one of the alternating current lines and a main winding of one of the motors to selectively terminate power to that main winding while maintaining power to both auxiliary windings and the main winding of the other motor. Such a control circuit allows a de-icing operation with the cool/heat pump working in a heating mode, without blowing cold air into the room which is to be heated.

Abstract: A heat-pump refrigeration cycle is constructed using a compressor, a four-way valve, a water heat exchanger, a receiver, and air heat exchangers. The compressor draws in, compresses, and discharges refrigerant. The four-way valve switches a direction of refrigerant flow, and a water heat exchanger allows an exchange of heat between inflow refrigerant and water supplied from a water supply unit. The receiver stores liquefied refrigerant, and a parallel circuit of a plurality of air heat exchangers allows an exchange of heat between the inflow refrigerant and indoor air. The water heat exchangers are positioned at a location higher than the receiver, which, during the cooling operation, permits liquefied refrigerant generated at the water heat exchanger to run down into the receiver. This prevents the refrigerant from remaining in the water heat exchangers.

Abstract: An air conditioning apparatus comprising: a single heat source device including a compressor, a reversing valve, an outdoor heat exchanger and an accumulator; a plurality of indoor units including indoor heat exchangers and first flow controllers; a first main pipe and a second main pipe for connecting between the heat source device and the indoor units; a first branch joint which can selectively connect one end of the indoor heat exchanger of each indor unit to either one of the first main pipe and the second main pipe; a second branch joint which is connected to the other end of the indoor heat exchanger of each indoor unit through the first flow controllers, and which is also connected to the second main pipe through a second flow controller; the first branch joint and the second branch joint being connected together through the second flow controller; the second branch joint being connected to the first main pipe through a fourth flow controller; a junction device which includes the first branch joint, th

Abstract: In multiple system type air conditioner, there are provided an auxiliary outdoor heat exchanger provided in an outdoor unit, and defrosting device that, on heating operation, periodically or as needed feeds the refrigerant discharged from the compressor to the outdoor heat exchanger and all the indoor heat exchangers. After the refrigerant has passed through the outdoor heat exchanger and all the indoor heat exchangers, the refrigerant returns to the compressors through the auxiliary outdoor heat exchanger.

Abstract: An air conditioning system for multiple rooms, comprising:an outdoor unit including a variable delivery compressor, a four way reversing valve and an outdoor heat exchange unit;two main connecting pipes composed of a high pressure main pipe and a low pressure main pipe to connect between outdoors and indoors;a distribution controller which is connected to the main connecting pipes to divide them into a high pressure pipe, a low pressure pipe and a medium pressure pipe therein;a plurality of indoor units which include indoor heat exchangers, respectively, which are one end connected to the medium pressure pipe through electronic expansion valves, respectively, and which are the other end selectively connected to either one of the high pressure pipe and the low pressure pipe, respectively;detecting means for detecting either one of refrigerant temperatures and refrigerant pressures; andcontrol means for carrying out a predetermimed control based on such detection.

Abstract: A control system for use in an air conditioner including a room heat-exchanger and an outside heat-exchanger. For controlling the room temperature, the control system sets a plurality of cooling start temperatures and a plurality of heating start temperatures and compares the room temperature, sensed by a temperature sensor, with the plurality of cooling start temperature and the plurality of heating start temperatures so as to control the outside heat-exchanger in accordance with the comparison results. The plurality of cooling or heating start temperatures includes a first cooling or heating start temperature and a second cooling or heating start temperature lower or higher than the first cooling start temperature. The control system first performs the temperature control on the basis of the first cooling or heating start temperature and then controls it on the basis of the second cooling or heating start temperature under predetermined conditions.

Abstract: An air conditioning apparatus in which one outdoor unit is connected to several indoor units through respective refrigerant tubes and signal conductors. The outdoor unit has compressors for discharging refrigerant and an outdoor heat exchanger. Each outdoor unit has an indoor heat exchanger and an indoor heat exchanger temperature sensor. When an operating device signals a check node, the compressors are stopped for a predetermined time period. Then the compressors are operated to sequentially discharge refrigerant to each indoor unit. A checking device then monitors the signal conductors of each indoor unit for a signal indicating a certain temperature condition. Based on the signals received, the checking device determines whether the indoor units are properly connected to the outdoor unit.

Abstract: For use with a heat pump to increase cold weather heating efficiency, a supplemental heat exchanger and associated refrigerant flow lines for generating additional expanded refrigerant and transferring the additional expanded refrigerant to the heat pump compressor during the cold outside conditions, included isn a monitoring system for detecting and actively regulating the refrigerant pressure and temperature at a location in the supplemental heat exchanger and associated refrigerant flow lines just prior to the refrigerant entering the compressor. The monitoring system automatically connects the supplemental heat pump, to enhance the heating cycle capabilities, and disconnects the supplemental heat pump, when the enhanced heating cycle capabilities are no longer required.

Abstract: A transport refrigeration system including host and remote refrigeration systems having local and remote evaporators, respectively, for respectively controlling the temperatures of first and second compartments via cooling and hot gas heating cycles. The host and remote refrigeration systems each have a plurality of controllable valves, including a controllable valve in their respective suction lines, and they each have a suction line to liquid line refrigerant by-pass lines, enabling either the host or remote evaporator to function as a condenser for the other, while by passing the normal condenser function, and further enabling either evaporator to control to a lower temperature than the other, as desired.

Abstract: An air conditioner comprising a compressor, a four-way directional control valve, an outdoor heat exchanger, and a plurality of indoor heat exchangers, which are arranged to enable the cooling/heating combined operation. The air conditioner further comprises a first connecting pipe bypassed from a piping line, which is adapted to feed a compressed coolant from the compressor toward the outdoor heat exchanger, for line communication with at least one indoor unit, and a second connecting pipe bypassed from a piping line, which is adapted to feed the compressed refrigerant from the compressor toward at least one indoor heat exchanger, for line communication with the outdoor heat exchanger.

Abstract: A heat pump system selectively operable in cooling and heating modes of operation and having an internal combustion engine prime mover which produces refrigerant vapor compression, and which produces excess heat for rejection, is provided with a first heat exchanger that evaporates compressed refrigerant in the system heating mode of operation, with a second heat exchanger which uses prime mover rejected heat to heat a working fluid, and with a fluid distribution arrangement which is selectively operable to flow the heated working fluid in heat exchange relation to said first heat exchanger also, in the system heating mode of operation to provide a defrost capabilities and to improve heat pumping heating capacity at low ambient temperatures.

Abstract: A heat pump is provided with a reversible fan motor in its outdoor coil and, after a delay period following initiation of the defrost cycle, the fan is caused to operate in a reverse direction to thereby cause the surrounding air to flow through the outdoor coil in a direction opposite to that in which it flows during the heating mode operation. During this time, the fan is operated at a relative slow speed to thereby prevent the convective flow of heat upwardly, while at the same time causing little, if any, flow of ambient air downwardly into the coil.

Abstract: An environmentally safe cooling system employing a non-freon base Stirling cycle cooler whereby a collant is cooled in a heat exchanger, circulated to a remote location to a set of refrigeration coils (over which air is circulated) and subsequently recirculated to the heat exchanger for removal of the coolant absorbed heat to repeat the cycle.

Abstract: An air conditioning system including a refrigerant circuit having a compressor, a three port switching valve, a four port reversing valve, an outdoor heat exchanger, a first throttle device including a first decompression device, a second throttle device including a first decompression device, an indoor heat exchanger and an accumulator connected in series by use of refrigerant pipes; a first bypass circuit which is constructed to carry out heat exchange with the intake pipe connecting between the accumulator and the compressor, and which is connected as a bypass to the pipe connecting between the first and second throttle devices; a second bypass circuit having a check valve to bypass the first decompression device; a third bypass circuit having a check valve to bypass the second decompression device; a fourth bypass circuit which is connected as a bypass to the pipe between the first and second throttle devices, and which is smaller than the discharge pipe in inside diameter; and a fifth bypass circuit whic

Abstract: A cooling and heating concurrent operation type of multiple refrigeration cycle comprises an indoor unit including a variable delivery type of compressor and an outdoor heat exchanger; indoor units including indoor heat exchangers, respectively; triple connection pipes of a high pressure gas pipe, a high pressure liquid pipe and a low pressure gas pipe, the triple connection pipes connecting between the outdoor unit and the indoor units; pressure detection means for detecting the intake pressure of the compressor and the discharge pressure of the compressor; and calculation and control means for comparing two detected values of the intake pressure and the discharge pressure of the compressor with two set values of a set intake pressure and a set discharge pressure, and for making variable controls of the compression capability of the compressor and the heat exchange capability of the outdoor heat exchanger based on the respective deviation values between the respective detected values and the respective set v

Abstract: A refrigeration cycle comprising a compressor and an outdoor heat exchanger, both of which are arranged outside a room to be air-conditioned, to communicate with an indoor heat exchanger and a radiant heat exchanger, both of which are arranged inside the room, and are operated simultaneously in a heating operation mode. A fan delivers air to the indoor heat exchanger. A temperature sensor detects the temperature of the radiant heat exchanger. A controller controls the indoor heat exchanger fan speed so as to control the radiant heat temperature from the radiant heat exchanger in accordance with a temperature detection signal from the sensor.