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: A system for controlling the operation of an HVAC system which includes a direct expansion coil, a condenser, a pre-cool coil, and a control system. The control system includes a controller and sensors. The controller receives signals indicative of air flow through the direct expansion coil from the sensors, compares the received signal to a stored air flow rate, and disables the compressor if the stored air flow rate is equal to or greater than the stored value. The controller is also adapted to vary air flow into an occupied space for small changes in the cooling load. In addition, the controller can artificially load the compressor during periods of small cooling load by restricting flow of a cooling agent between the cooling tower and the condenser, or by directing warm water from the condenser through the pre-coil coil.

Abstract: A system for controlling the operation of an HVAC system which includes a direct expansion coil, a condenser, a pre-cool coil, and a control system. The control system includes a controller and sensors. The controller receives signals indicative of air flow through the direct expansion coil from the sensors, compares the received signal to a stored air flow rate, and disables the compressor if the stored air flow rate is equal to or greater than the stored value. The controller is also adapted to vary air flow into an occupied space for small changes in the cooling load. In addition, the controller can artificially load the compressor during periods of small cooling load by restricting flow of a cooling agent between the cooling tower and the condenser, or by directing warm water from the condenser through the pre-coil coil.

Abstract: A method of controlling a multiplicity of condenser fans in a refrigeration system comprising the steps of: calculating a first difference in state between a high pressure side and a low pressure side of the refrigeration system; determining an optimum state for the refrigeration system; determining a second difference in state between the first difference and the optimum difference; and controlling the multiplicity of condenser fans if the second difference exceeds a predetermined value.

Abstract: A system for controlling the operation of an HVAC system which includes a direct expansion coil, a condenser, a pre-cool coil, and a control system. The control system includes a controller and sensors. The controller receives signals indicative of air flow through the direct expansion coil from the sensors, compares the received signal to a stored air flow rate, and disables the compressor if the stored air flow rate is equal to or greater than the stored value. The controller is also adapted to vary air flow into an occupied space for small changes in the cooling load. In addition, the controller can artificially load the compressor during periods of small cooling load by restricting flow of a cooling agent between the cooling tower and the condenser, or by directing warm water from the condenser through the pre-coil coil.

Abstract: An air conditioning condenser cooling device is characterized by a unique valve assembly which delivers a spray mist to the coils of the condenser only while the condenser is operating. A vibration transducer is provided which senses vibrations of the condenser when the condenser is in operation. The transducer produces a signal which opens a valve to supply fluid such as water from a fluid supply to a spray nozzle adjacent the condenser coils. When the condenser is off and thus not vibrating, the valve closes and the spray is terminated.

Abstract: A method for controlling a motor vehicle air conditioning system is described. The motor vehicle air conditioning system comprises a refrigeration circuit including a refrigerant compressor, a condenser, an evaporator and a throttle device arranged upstream of the evaporator. The condenser is associated with a ventilating fan and the evaporator is associated with a blower. The compressor capacity, the condenser capacity and the evaporator capacity are directly or indirectly sensed by sensor means and supplied as electrical variables to an electronic control circuit which logically combines these input signals and generates output signals in dependence on at least two of these capacity values and including further parameters. The control circuit acts on electrically controllable acturators for influencing the compressor capacity, the condenser capacity and/or the evaporator capacity.

Abstract: A compression-type air-conditioning system for a railraod car, intended in particular for a high-speed train, includes a refrigerant compressor, a condenser with tubes in which compressed fluid is cooled by circulation of air around the tubes and is thereafter liquified, an expansion valve supplying a low-temperature refrigerating gas, and an evaporator following the expansion valve. The tubes of the condenser form an oblique bank between a floor of the railroad car and an underframe of the air-conditioning system. The oblique bank enables, on the one hand, the number of the tubes and consequently the cooling capacity of the air-conditioning system to be increased. On the other hand, space is freed up in a vertical direction for fitting damping devices at different fastening points on the condenser. As a result of the invention, there is an improvement in the comfort of passengers, both in terms of air-conditioning and in terms of reducing vibrations. Furthermore, there is a reduction in operating costs.

Abstract: An integrated air conditioning and water heating system provides cooling of a comfort zone, as required, as well as water heating. A variable speed compressor delivers compressed refrigerant first to a water heat exchanger and then to an outdoor condenser coil. From there the refrigerant cycles through an indoor evaporator coil back to the compressor. When the demand for water heating is above a predetermined amount and the cooling load is below a predetermined cooling load threshold, a full condensing mode is selected in which most of the heat from the comfort zone is used for water heating. If the cooling demand is high or if the water heating demand is low, a desuperheating mode is selected in which most of the heat is transferred to the outdoor air. The outdoor coil temperature is monitored and if it is above a safe limit, the desuperheating mode is selected. In the full condensing mode the outdoor fan is held off. In the desuperheating mode, the outdoor fan is energized.

Abstract: A self-contained ice making machine including a cabinet divided into first and second separate compartments with an ice making head including an evaporator disposed in the first compartment and with a compressor and air cooled condenser disposed in a second compartment. Air from the room surrounding the ice machine is drawn through an air intake in a side of the cabinet and through the condenser into the second compartment by a condenser cooling fan, and a vent pipe having an exhaust fan is connected to an air discharge opening in the top of the second compartment for venting the second compartment outside of the room in which the ice making machine is installed.

Abstract: An external water supply tank having a relatively large water storage capacity fixed to the outside of a portable air conditioning apparatus to supply water to a spray device disposed in the air conditioning apparatus for cooling a condenser subject to generation of heat.

Abstract: There is disclosed a new and improved cooling system and method for cooling the air in an enclosed space. The cooling system includes a cooling tower having a plurality of fans arranged to cool a first fluid and a chiller including a condenser thermally coupled to the first fluid, a compressor, and an evaporator. The chiller further includes first conduit means for carrying a refrigerant. A chilled fluid loop including second conduit means circulates a second fluid through the evaporator for cooling the second fluid and is arranged to flow air over the second conduit means and into the enclosed space for cooling the air in the enclosed space. Fan control means controls the speed of the cooling tower fans to minimize the total power consumption of the fan motors and the compressor.

Abstract: A novel apparatus for harvesting ice from an ice maker is disclosed. A refrigeration system having a hot gas bypass valve and a water cooled condenser is used to make ice. A programmable controller interrupts the water supply to the condenser, causing the condensing pressure to rise rapidly. This pressure increase is sensed by a pressure sensor, which then opens the hot-gas valve, sending hot gaseous refrigerant to the evaporator to harvest the ice.

Abstract: The refrigeration plant disclosed herein includes an evaporator, a compressor connected to the outlet of the evaporator, a condenser connected to the outlet of the compressor, a controllable expansion valve connected to the outlet of the condenser and having its outlet connected to the evaporator and condenser pressure controls for providing at the least possible condenser pressure, the degree of opening of the expansion valve to obtain an optimum ratio between the condenser pressure and the evaporator evaporator performance. That is, the degree of opening of the expansion valve lies in a range giving the least possible condenser pressure.

Abstract: In the supermarket cooling system disclosed herein, a variety of evaporative loads having different suction requirements are served by respective compressors, each operating across a corresponding pressure differential but pumping into a common high side header. A single condenser unit serves the combined refrigerant flow from all loads and, from the condenser, the refrigerant flow normally passes through an air-cooled heat reclaim exchanger which is downstream of an air conditioning evaporator in the air conditioning ductwork. The heat reclaim exchanger can be selectively bypassed for certain extreme conditions of operation. By varying the air flows through the condenser unit and the heat reclaim exchanger, a highly efficient thermal operation under the most prevalent conditions is achieved in a very simple hardware configuration.

Abstract: A multi-zone thermal energy storage variable air volume heat pump system for capacity effective averaging of continuously operable heat pumps of varied capacity and each operable at its optimum capacity and assigned to a separate zone space, wherein variable air volume by-pass ducts and zone space dampers operate in response to zone space temperature, and characterized by a chilled water storage tank and pump circulating chilled water through one closed circuit, and a hot water storage tank and pump circulating hot water through another closed circuit and through a water conditioning coil, there being a downstream charging coil and a re-cooling coil in the supply air duct upstream from the air conditioning coil and each selectively in closed circuit through the chilled water storage tank, and the re-cooling coil selectively in closed circuit through the hot water storage tank, and control means therefor.

Abstract: The dry cleaning machine according to the invention comprises: a rotating drum (1) disposed in an enclosed chamber (2); an air flow duct (3) in the form of a closed loop in association with the chamber (2); and a cooling circuit having a condenser (6) disposed in the air flow duct (3) downstream of an evaporator (10) and is characterized by a control circuit (11) comprising: an internal heat exchanger (12) interlaced at least to some extent with the condenser (6); and means (13) for controlling the flow of a fluid in the control circuit (11).

Abstract: A liquid cooled refrigerant condenser comrpises an enclosure with an upper chamber and a lower chamber forming a partitioned liquid reservoir containing cooling liquid. The enclosure contains a refrigerant condensing manifold with an inlet pipe for receiving refrigerant gas from a compressor, an intermediate portion disposed within the lower chamber and submerged in the liquid, and an outlet portion for conducting the refrigerant gas to an evaporator coil. The manifold inlet pipe is coiled in a square helical coil above the liquid level in the reservoir. A blower mounted at the top of the enclosure directs the flow of air onto the liquid reservoir at sufficient velocity to entrain some of the liquid and direct a mixture of liquid and air onto the coiled inlet pipe of the manifold to remove heat from hot refrigerant gas passing through the coiled manifold.

Abstract: There is disclosed by the present invention a device for increasing the efficiency of the condenser unit of an air conditioner which consists of a predetermined length of copper tubing having perforations punched into it at regular intervals of approximately two inches, and which is covered by a sleeve made up of a woven textile material which is of the length equal to that length of tubing having perforations punched into it. The perforated length of tubing, ensheathed in the sleeve of woven textile material is laid atop the fins, of a condenser unit, which have been bent to accommodate this portion of the device resting on top of the condenser unit. When ambient atmospheric temperature rises above a certain temperature a thermostat causes a valve to allow water to flow into the device, when it flows out of the perforations in the copper tubing and is diffused by the wicking material along the length of the device until the wicking material is saturated.

Abstract: A cooling system for radiator and condenser with an air conditioner having first and second electrically driven blowers for cooling the radiator and condenser, and a cooling cycle operation switch which comprises a control circuit provided on at least one side of the first and second blowers for either stopping or operating at low speed the one of the first and second blowers when any electrical equipment of vehicle such as headlights, wipers, is operated during the cooling cycle, an engine cooling water temperature switch operative to turn on and off the first blower by releasing the control of the control circuit when any of the electrical equipments is operated, and/or a thermal load switch operative to turn of and off the second blower in accordance with the outside temperature conditions by releasing the control of the control circuit, when any of the electrical equipments is operated.

Abstract: A cooling system for a radiator in an internal combustion engine is provided with a pair of fans connected to a first motor for a small electric current and a second motor for a large electric current, respectively. Relays are provided for operating the first and/or second motor sequentially in accordance with the degree of cooling requirement of the engine. A delay device is provided for delaying the operation of the relay(s) for attaining a stronger cooling requirement for a predetermined short period just after the engine is started. A generation of rush current in the relay contacts is prevented.

Abstract: A refrigeration unit (10) includes a temperature control circuit (42) in which a plurality of coils (32) are wrapped around associated compressors (24, 26, 28, 30, 38 and 40) and are arranged in parallel between a supply manifold (44) and a return manifold (46) so that as long as one of the compressors is operating, heat will be transferred into a working fluid flowing through the coils in order to heat any non-operating ones of the compressors. Further, during warm weather, any excess heat can be dissipated from the working fluid to a suitable heat sink as by use of a heat exchanger or any appropriate heat reclaiming process. In extremely cold environments, heat can be added to the working fluid in a suitable manner to maintain the fluid above a predetermined minimum level necessary to assure proper functioning of the compressors.

Abstract: A method for controlling the temperature of water to be fed into a water cooling tower in which when the driving power required to drive motors to be controlled is in excess of the power which can be derived from a frequency converter, some of the motors are driven by a constant-frequency power supply while the remaining motors are driven by the frequency converter. Therefore, the temperature of water to be fed into the water cooling tower can be continuously controlled without increasing the capacity of the frequency converter.

Abstract: In a heat pump system according to the present invention, a plurality of heat exchangers are arranged in sequence in the vertical direction in a tank for storing a heat medium therein, and these heat exchangers are connected in series to a heat exchanger arranged outside the tank to construct a cooling medium circulating passage. A by-passing passage by-passing the heat exchanger arranged outside the tank and expanding means arranged in series to this heat exchanger is formed in the cooling medium circulating passage, and an expansion passage is arranged in parallel to the cooling medium circulating passage connected to the heat exchangers within the tank.

Abstract: The invention relates to a method and a plant for the central heating of a building provided with at least one thermodynamic machine such as a heat pump or a refrigerating machine. The method is characterized in that, without affecting the normal operation of the thermodynamic machine, during the heating period:when the temperature of the heat transfer fluid in the exchanger-accumulator tank reaches a certain threshold, the conduits via which the auxiliary boiler is connected to the circuit supplying the exchanger network are isolated and the return of this circuit to the tank is released while, on the other hand, when the temperature of the heat transfer fluid in the exchanger-accumulator tank drops below a certain threshold, the return to the exchanger-accumulator tank of the circuit supplying the exchangers is cut off and the auxiliary boiler whose discharge and return conduits are connected to the circuit is actuated.

Abstract: A vapor generating and recovering apparatus for vaporizing a liquid and condensing a vapor, the apparatus including a container having a liquid therein with a heating and cooling system in heat transfer relation with the liquid and vapor in the container. The heating and cooling system includes means to vaporize the liquid; means to condense the vaporized liquid; and, means to compress a refrigerant. The means to compress the refrigerant is in fluid communication on its high pressure side with the means to vaporize a liquid or heat a liquid and on its low pressure side with the means to condense or cool a liquid. The heating and cooling system further includes a complementary condenser system on the high pressure side of the means to compress a refrigerant, discharging its heat external to said apparatus and pump down valve means selectively closeable so that refrigerant can be pumped out of the means to compress a refrigerant.

Abstract: The disclosed invention is an energy conservation system for heating and ventilating structures, particularly buildings with large refrigeration units such as convenience stores, grocery stores and restaurants. The system employs a plurality of manifold assemblies in conjunction with existing air conditioning and heating units to control air flow to recover heat from external heat exchangers of refrigeration units or provide interior ventilation with exterior air. The manifold assemblies preferably employ either a flexible damper gate sliding along tracks on a pivoted gate damper to control air flow.

Abstract: A cooling system for use with an engine driven vehicle having an air conditioning system to cool the air conditioning condenser and vehicle engine. The cooling system is connected to the evaporator plenum chamber of the air conditioning system and a blower passes cool air from the evaporator plenum chamber to cooling pipes positioned adjacent the air conditioning condenser. A control turns the system on and off and controls the volume of cool air passing through the system. In the version used with a liquid cooled engine, the cooling pipes are positioned in front of the radiator.

Abstract: A de-superheater is positioned between the compressor and the condenser of a refrigeration circuit and a pump circulates heat-transfer fluid past the de-superheater to heat it to a temperature higher than fluid heated by the condenser. The de-superheater is by-passed by a refrigerant line and a valve controls the amount of refrigerant passing through the de-superheater in accordance with the demand for the heated fluid as sensed by a temperature sensor at the heated fluid outlet of the de-superheater. The pressure of the refrigerant entering the condenser is measured to determine the amount of heat being taken therefrom. If this is insufficient to allow condensation of refrigerant to be completed in the condenser, a heat exchanger and a variable speed fan provide additional cooling of the refrigerant to ensure its complete condensation.

Abstract: A multi-mode water heating system wherein a capacity control mechanism is provide so that no additional heat source is required and via use of capacity control, either solar radiation energy or ambient air energy is selectively utilized dependent on the availability of sunshine. A system configuration is so arranged as to maximize the system seasonal coefficient of performance by a refrigeration cycle optimization which adjusts both a pump/compressor speed and pressure regulating valve opening.

Abstract: A combination refrigeration circuit and hot water preheater is disclosed. Specific temperature sensing arrangements in combination with a bypass circuit and a continually operating pump are disclosed to obtain effective control of the hot water preheating system in combination with a refrigeration circuit. Additionally disclosed is an air conditioning system having a combination desuperheater hot water preheater built into a compressor section thereof to eliminate field connections to a hot water preheater.

Abstract: An energy conservation arrangement for household refrigerators and water heaters, in which the source of cold water to the hot water heater is divided and part is caused to flow through and be warmed in the condenser of the refrigerator. The warmed water is then further heated in the oil cooling loop of the refrigerator compressor, and proceeds then to the top of the hot water tank.

Abstract: The invention presented herein provides an improved method for controlling the blowdown of recirculating water for an industrial cooling system or the like, in direct proportion to the heat load on refrigeration systems. A temperature probe is positioned in the recirculating water which is in communication with a blowdown valve. As the heat load on the system increases the temperature of the cooling water increases and the blowdown valve is then regulated to release more of the circulating water. Additional makeup water and chemicals may be also supplied to the cooling system to maintain a proper chemical balance.In the preferred embodiment of the invention the probe is positioned between the refrigerant condenser and the cooling tower in the circulating water system. Appropriate chemical feed systems and makeup water can be regulated to function in relation to the amount of blowdown to insure that the desired chemical balance is maintained.

Abstract: A system for optimizing the control of the water temperature within a cooling tower is disclosed. The temperature and the relative humidity of the air outside the cooling tower are measured and are selectively utilized as inputs to a plurality of modules containing function blocks in a logic arrangement. The function blocks produce an output signal indicative of the wet bulb temperature of the outside air which is compared to the cooling tower water temperature causing the speed of the cooling tower fans to be adjusted in response to the temperature difference therebetween.

Abstract: In a heat pump system for domestic hot water, a compressor section 18 provides working fluid at a multiplicity of pressures. Multiple condensers 12, 14 are arranged so that higher pressure working fluid is in heat exchange relationship with higher temperature water. Upon leaving the condensers 12, 14, working fluid is independently expanded and then combined, and it runs through a single evaporator 31 before returning to the compressor 18. The water may be circulated past an external condenser 12, 14 or the condensers 46, 48 may be immersed in a hot water storage tank 38.

Abstract: A heat pump with a compressor arrangement whose condenser forms a heater for water, and whose evaporator is arranged to be heated by air which by means of a fan in a fan space is blown through the evaporator. An air path for ambient air or an air pass for room air is connected alternatively to the fan space. A control means is arranged between the fan space and two air passes for selective connection of one or the other air pass to the fan space, and with the control means in a first position, the fan is arranged to blow air through an air path with ambient air and through the evaporator for water heating, and with the control means set in another position, the fan blows air through another air path with room air and through the evaporator.

Abstract: Air conditioning systems and methods for use in multi-unit buildings wherein an air conditioning system is provided with an air handling unit which includes a water cooled first heat absorbing means, a mechanical refrigerant cooled second heat absorbing means, and means for circulating air successively through the first and second heat absorbing means. Means is provided for circulating cooling water successively through a first heat absorbing means and a refrigerant condensing heat exchanger in series relation with a flow rate through at least the first heat absorbing means substantially independent of the operating condition of the refrigerant compressor and the refrigerant condensing heat exchanger.

Abstract: Method and apparatus to extract heat by transferring heat from hot compressed refrigerant to a coolant, such as water, without exceeding preselected temperatures in the coolant and avoiding boiling in a water system by removing the coolant from direct or indirect contact with the hot refrigerant.

Abstract: In a heat pump plant, a hot gas heat exchanger (8) is connected to the refrigerant circuit between a compressor (4) and a condenser (5) having a built-in sub-cooler (6), the heating medium side of said hot gas heat exchanger being connected to a domestic water heating device (9). An extra sub-cooler (10) having its heating medium side connected to a separate low temperature heating circuit is interconnected between the built-in sub-cooler and an expansion valve (11). An ejector (12) is connected to the supply line from the hot gas heat exchanger to the domestic water heating device, said ejector being also connected via a domestic water heating pump (13) to the heating medium outlet of the condenser-sub-cooler combination (5, 6). The return line from the domestic water heating device to the hot gas heat exchanger is connected via a line (15) to the heating medium inlet of the condenser-sub-cooler combination.

Abstract: An auxiliary condensing coil is interposed between the compressor and primary coil of a refrigerated air conditioner through a pressure sensor operative in response to excessive head pressure for energizing an auxiliary coil fan motor and sump pump. The auxiliary coil is cooled by ambient air and moisture.

Abstract: A device for supplying cooling air under pressure, e.g. for cooling the electric apparatus in an aeroplane at rest on the ground, comprising an internal combustion motor, such as a diesel motor, an air compressor having its suction line connected to the atmosphere, the pressure side of this air compressor supplying air under pressure; and a cooling circuit for cooling this air under pressure, said cooling circuit including a compressor, a condenser and a cooler. A cooler with air-cooling is operative between the air compressor and the said cooler in the cooling circuit, while actuating means, which reacts to the temperature of the atmosphere switches the compressor in the cooling circuit on and off when the temperature of the atmosphere rises or falls to a predetermined value.

Abstract: This invention relates to heating and cooling systems and more particularly to an improved system utilizing a Stirling Cycle engine heat pump in a refrigeration cycle.

Abstract: Useful heat from an ice-maker is efficiently recovered and employed to heat water without any significant increase in the energy normally expanded in making ice. During ice-making, liquid refrigerant from a high-pressure receiver is expanded and supplied to an evaporator where ice-making occurs. Expanded refrigerant is returned to a compressor through an accumulator, and high-pressure vapor is condensed by heat-exchange with a circulating stream of water withdrawn from a storage tank. Condensed refrigerant is returned to the receiver through a restrictor. During the harvesting cycle, relatively warm, high pressure vapor from the receiver is fed to the evaporator, and any of it condensed to liquid therein is trapped in the accumulator. The compressor runs continuously throughout harvesting and ice-making, and any refrigerant trapped in the accumulator is used to subcool the high-pressure liquid prior to its expansion in the subsequent ice-making cycle.

Abstract: A cylindrical convection heat dissipation tower is shown having a top and bottom cap with wound heat exchange coils dispersed within the tower. Cooling fluid is introduced gradually at the bottom of the tower while warmer cooling fluid is discharged from the top of the tower. The tower utilizes "stacking" principles to gradually lower the temperature of the refrigerant fluids entering at the top of the tower, passing downwardly through the coils, and rising upwardly through an insulated portion of that coil, exiting from the top of the tower.

Abstract: The jacket-like precooler embraces the condensing unit of a residential air conditioning system to position porous fill media of the jacket in upstream airflow relationship to air inlets of the unit. A water discharge manifold along the upper extent of the media may be connected to an outdoor spigot, and a pump situated in a reservoir at the base of the jacket, when plugged into an outdoor electrical outlet, is operable to recirculate water to the manifold after gravitating through the media and precooling ambient air drawn transversely into the unit. A float valve prevents makeup water supplied by the spigot from entering the system when the reservoir is filled to a certain depth, and actuation of the pump is withheld until the ambient air exceeds a certain predetermined temperature. Moreover, the pump is only actuated when the condensing unit itself is in operation as determined by a pressure sensitive device situated within the stream of air drawn into the unit.

Abstract: A control system for regulating the flow of water to the condenser to maintain most effective loading of the compressor in a water-to-air heat pump arrangement. The system incorporates a temperature sensitive valve which has a thermal transfer contact with the refrigerant flowing through the heat pump compressor which upon sensing the heat in the refrigerant rising or falling correspondingly variably opens and closes the water line to the heat exchanger so as to maintain the temperature at the compressor within a predetermined range, and maintain proper loading on the compressor during heating and cooling cycles of the heat pump.

Abstract: An engine-driven refrigeration unit includes a first heat exchanger functioning alternatively as a refrigerant condenser or as a refrigerant evaporator. When the heat exchanger is functioning as a refrigerant evaporator the heat transfer medium furnished thereto for providing a source of heat to vaporize the refrigerant is preheated by absorbing heat from a relatively warm fluid employed as the cooling medium for the engine driving the refrigeration unit.

Abstract: A refrigeration system in which compressors are mounted in one compartment of the housing and condensers and receivers are mounted in an adjacent compartment. Ambient cooling air flows first into the compressor compartment, then into the condenser compartment, and then to the atmosphere. Parallel flow paths from the compressor compartment to the condenser compartment are provided--one flowing the air over the condensers, the other bypassing the condensers, before being expelled. The bypass has a movable flapper valve controlled by the ambient air temperature which causes the ambient air to bypass when its temperature drops below a given point. A shroud encloses the receivers and has a fan-driven heater controlled by the same thermal sensor that controls the flapper valve.

Abstract: A refrigerant condensing system for heating water includes a thermostatically-operated valve for delivering 140.degree. F. water from a condenser to the top of a water storage tank and a by-pass valve for allowing the heated water from the condenser, which is then heated to a lower temperature, to flow directly to the bottom of the storage tank after the upper third of the tank has been filled with 140.degree. F. water, thereby increasing the efficiency and heating capacity of the refrigeration system.

Abstract: A converter for connecting a second condenser in series in a process fluid chilling loop system including a compressor, a discharge service valve mounted on the compressor outlet, a condenser, and a refrigerant-to-process fluid heat exchanger. The converter includes a housing, mounted on the compressor interposed between the compressor outlet and the discharge service valve, which includes first and second separate transfer chambers. The first transfer chamber connects directly to the compressor discharge port and the second transfer chamber connects directly to the discharge service valve. Each transfer chamber is connected to an external port on the housing by a plurality of small tunnel passages, thereby affording a thin, flat converter for connecting a second condenser in series with the system. An inclined web that extends from an annular wall on one side of the housing to an annular wall on the other side of the housing divides the housing into the first and second separate transfer chambers.