Abstract: A cooling system for use with a heat source is disclosed. The cooling system has an oil cooler, a fluid pump driving fluid through the cooling system, a first heat exchanger, and a first bypass line to direct fluid around the first heat exchanger. The cooling system also has a first electrically-controlled valve to selectively direct at least a portion of the fluid to at least one of the first heat exchanger and the first bypass line based on a fluid temperature. The cooling system further has a second heat exchanger, and a second bypass line to direct fluid around the second heat exchanger. The cooling system additionally has a second electrically-controlled valve located upstream of the oil cooler and configured to selectively direct at least a portion of the fluid to at least one of the second heat exchanger and the second bypass line based on an oil temperature.

Abstract: An intercooler system includes an air duct configured to be supplied with outside air, an evaporator, and a heater core of an air-conditioning system being disposed within the air duct. An intercooler is supplied with the outside air from the air duct and configured to cool intake air passing therethrough using the outside air. A valve unit regulates flow of the outside air such that the outside air passes at least one of the evaporator and the heater core and is then supplied to the intercooler. Also, a control unit controls operation of the air-conditioning system and the valve unit.

Abstract: The present invention relates to a heat exchanger which can suitably regulate the quantity, the feeding position or the feeding order of heat exchange medium fed into tubes to adjust heat exchange performance according to cooling and heating load. The heat exchanger comprises a plurality of tubes placed at least one header, each tube having both ends fixed to the header, medium-distributing means installed at the header for feeding heat exchange medium to the specific tubes, a tank placed over the medium-distributing means, the tank having a medium-inlet pipe, a medium-outlet pipe and distribution passages for feeding heat exchange medium to specific regions of the medium-distributing means, and medium-regulating means installed at the tank and operated in response to a control signal for adjusting the feed of the heat exchange medium.

Abstract: An electronic equipment is provided, which comprises a liquid-cooling system and a cooling fan as a cooling system, efficiently cools the liquid-cooling system, and reduces fan noise.

Abstract: A system for the control of the contents of a reactor which employs a control element of variable area containing flowing heat transfer fluid. The area available for the for the control of the contents of the reactor is controlled is changed by opening and closing a bank of conduits in a cascade and the conduits are opened and closed according to a temperature measurement device in the medium whose temperature is to be controlled.

Abstract: A refrigerant system heat exchanger is characterized by improved airflow distribution through the use of at least one of the fans operating in the pulse width modulation or variable speed mode. Improved airflow distribution can be used to alleviate the effects of refrigerant maldistribution, enhance heat exchanger performance, prevent compressor flooding and improve comfort in the conditioned space.

Abstract: Some embodiments of a method, apparatus and computer system are described for configuring one or more air movers. A computer system may include a housing and an air mover coupled to an electronic device and positioned in relative proximity to an electronic component. In some embodiments, the air mover has an intake region, and is configured such that the intake region may include a first bisection larger than a second bisection. In some embodiments, a configuration module may be coupled to the air mover, such that the configuration module may alter the configuration of the air mover such that the intake region is altered. Other embodiments are described.

Abstract: An inverter apparatus includes heating components housed in an inverter main body and cooling fans for cooling the heating components. The inverter apparatus includes a fan unit case in which the cooing fans are housed as one integral unit, a housing space formed on an outer side of a ceiling surface of the inverter main body, and a fan cover that fixes the fan unit case. The fan unit case is slid to be housed in the housing space. The inverter apparatus makes it easier to replace cooling fans, reduce the number of components, enhance cooling efficiency, and secure high reliability.

Abstract: A system for defrosting an air-to-air heat pump system is disclosed. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil. The bypass loop includes a valve movable between closed and open positions. A sensor monitors a preselected condition indicative of outdoor coil performance. A controller communicates with the valve and the sensor. Once the controller determines that a preselected set point of a preselected condition indicative of deteriorating performance has been reached, the controller sends a signal to open the valve, allowing warm refrigerant to bypass expansion valves and flow to the outdoor unit to defrost the outdoor unit. Once defrosting is accomplished, the valve can be moved to a closed position to resume normal operation of the heat pump unit.

Abstract: An integrated cooling system for cooling systems such as laptops or subsystems such as a graphics card is disclosed. An integrated cooling system includes a first layer having a contact area configured for coupling to a heat source, wherein the first layer has a fluid path passes adjacent to the contact area where the heat source is in thermal contact with first layer. Coupled to the first layer is a second layer to which a number of air fins are attached. The invention includes a pump that is connected to the fluid path forming a closed path for circulating a fluid through the first layer. Within the first layer, the fluid path will contain a plurality of fluid fins which control the flow of a fluid within the fluid path. Within the fluid path, a structure providing a double-counter flow adjacent to one or more electronic devices. Additionally the fluid path can include a microchannel plate structure.

Abstract: A heat pump type air conditioner having an improved defrosting structure and a defrosting method for the same. When frost is not excessively accumulated on piping of an outdoor heat exchanger, a solenoid valve is controlled such that warm refrigerant from a compressor intermittently passes through a second pipe line, a heat discharging pipe line, and a third pipe line. When the air conditioner is operated in heating mode, the amount of frost accumulated on the outdoor heat exchanger is deduced from the temperature of the piping of the outdoor heat exchanger, and then a defrosting operation is performed based on the temperature of the piping of the outdoor heat exchanger. Consequently, the frost accumulated on the outdoor heat exchanger is quickly removed based on the amount of frost accumulated on the outdoor heat exchanger, and the period of time for which the air conditioner is not operated is reduced, whereby more comfortable and pleasant heating function is provided to a user.

Abstract: In a method for operating a cooling and heating circuit of a motor vehicle driven by an internal combustion engine, a first cooling medium path is provided through a bypass conduit, a second cooling medium path is provided through a main cooler of the internal combustion engine, a third cooling medium is provided through a heating heat exchanger, and a fourth cooling medium path is provided through a heat accumulator. The cooling medium flows through the paths are subdivided by an electrically operated valves, and the cooling medium flows are generated by at least one pump. The valves are controlled by a control unit based on operational and environmental parameters as well as nominal values, and a third control valve which is controlled by the control unit is arranged in the fourth cooling medium path.

Abstract: A control is provided for controlling the operation of a climate control system, which includes a processor that is capable of receiving power from a low voltage power supply adapted to be connected to an external alternating current power source, or a second external low voltage power supply. The processor is capable of storing diagnostic information pertaining to the operating status of at least one component of the climate control system. The processor is configured to retrieve stored diagnostic information from memory pertaining to the climate control system and send the diagnostic information to the display means when the processor receives power from the external low voltage power supply and detects the absence of a connection to an external alternating current power source.

Abstract: A method for adjusting temperature of a machining liquid, e.g., slurry, etching liquid, by passing the machining liquid through a heat exchanger. The heat exchanger, which adjusts the temperature of the machining liquid, includes a ceramic heat exchanging tube which is made by baking silicon carbide (SiC).

Abstract: The invention refers to a plate heat exchanger, which includes a sensor device and a plate package of heat transfer plates (1). The heat transfer plates form between the plates (1) first passages (3) for a first fluid and second passages (4) for a second fluid. The sensor device includes a space (21), which is closed to the first passages (3) and the second passages (4). The closed space (21) is arranged to contain a medium, which can be influenced by the temperature of at least one of the fluids, and to be connectable to a device (14) for sensing a pressure change of the medium in the closed space (21). The closed space (21) is at least partly defined by at least one of the plates (1).

Abstract: The heat exchange apparatus and method is provided with an indirect evaporative heat exchange section and a direct evaporative heat exchange section. An evaporative liquid is sprayed downwardly into the direct evaporative section to directly exchange heat from the evaporative liquid flowing across fill sheets. The evaporative liquid is then collected in a re-spray tray. The collected evaporative liquid is then sprayed onto an indirect evaporative heat exchange section to indirectly exchange sensible heat from a fluid stream flowing within a series of enclosed circuits comprising the indirect evaporative heat exchange section.

Abstract: Process and device for controlling the temperature of an outbound secondary flow in a secondary circuit from a heat exchanger by a primary flow in a primary circuit, via a member that regulates the primary flow, influenced by a control unit. The enthalpy difference between inbound and outbound primary flow to and from the heat exchanger and the secondary flow are determined. The flow in the primary circuit is determined, and the parameters are supplied to the control unit for controlling the member, whereby the primary flow is controlled in dependence of the secondary flow, so that power supplied to the heat exchanger substantially equals the sum of the power needed to raise the temperature of the secondary flow from the initial temperature to the desired outbound temperature; the assumed power requirement for compensating for energy stored in the heat exchanger; and the assumed leak power from the heat exchanger.

Abstract: A cooling apparatus and method, and more particularly, an apparatus and method for cooling the air exiting an electronics enclosure, are disclosed. Air is taken into the enclosure and heated by the electronic equipment. The air is then expelled through a heat exchanger, which cools the exiting air. The exiting air is cooled using an external source of cooling liquid, which absorbs the heat from the exiting air. This absorbed heat is then expelled from the liquid outside of the environment containing the enclosure. Cooling the air exiting the enclosure causes the enclosure to present a neutral heat load to a room containing such an enclosure. Cooling the exiting air obviates the necessity of increasing the room air conditioning capacity to account for the heat added to the room by the electronics within the enclosure.

Abstract: A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a temperature sensor, a power regulator and a controller, the temperature sensor is utilized for determining the working fluid temperature and compare the actual input temperature, the actual output temperature and the predetermined temperature, and the controller is utilized for controlling the first solenoid valve, the second solenoid valve and the third solenoid valve for conveying the fluid to flow through various heat exchangers so that the working fluid is heated or cooled, with the result being that the working fluid temperature outputted is to reach the predetermined temperature, so as to acquire the working fluid having the exactly and precisely predetermined low temperature (?40° C. to 25° C.

Abstract: A system and method of supplying conditioned air to an aircraft environmental control system during ground support operations that uses at least one flow control door to control the flow of cooling air through a heat exchanger. The heat exchanger removes heat from a flow of compressed air supplied to the system. The temperature of the conditioned compressed air is controlled by selectively positioning the flow control door, which regulates cooling air flow through the heat exchanger.

Abstract: An improvement in defrosting an air-to-air heat pump system when in the heating mode. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil, The bypass loop includes a valve movable between closed and open positions. A sensor monitors a preselected condition indicative of outdoor coil performance. A controller communicates with the valve and the sensor. Once the controller determines that a preselected set point of a preselected condition indicative of deteriorating performance has been reached, based on received sensor signals, the controller sends a signal to open the valve, allowing warm refrigerant to bypass expansion valves and flow to the outdoor unit to defrost the outdoor unit. Once defrosting is accomplished, the valve can be moved to a closed position to resume normal operation of the heat pump unit.

Abstract: The invention relates to a controlling method of the discharge of coolant medium, and more particularly to a controlling method of the discharge of coolant medium in the heat exchange wind box. By mainly controlling the discharge of coolant medium in the heat exchange wind box, it is able to directly control the volume of discharged coolant medium that supplies the circulation need of the heat exchange tube according to the variations of the target volumes of environmental heat energy in the freezing and air-conditioning area. Therefore, it increases the operation efficiency of the freezing and air-conditioning equipment and achieves the heat balance stability of the freezing and air-conditioning area. Furthermore, by saving the circulated volume of the coolant medium, it achieves the energy saving objective.

Abstract: A horizontal rooftop engine cooling system includes one or more radiator units horizontally mountable to the rooftop of a bus and including a radiator interconnected to one or more passages of an engine of the bus to allow coolant to flow between the engine and the rooftop cooling system to cool the engine. The cooling system can incorporate a fan mounting shroud, a ram-air aerodynamic shroud, and/or an ornamental aesthetic appearance shroud.

Abstract: The device concerns among other things a plate heat exchanger having at least one pile of plate elements, each of which plate elements has a central heat transferring part and an edge part (15) surrounding this part, the heat transferring parts of the plate elements delimiting flow spaces between one another for at least one heat exchanging fluid (F1) and every plate element being of a double wall construction and having two heat transferring plates (1, 5; 2, 6; 3, 7; 4, 8) with a space therebetween. At least one layer element (16) is present in the space between the heat transferring plates (1,5; 2,6; 3,7; 4, 8) in at least one of the plate elements, every layer element (16) having at least one electrical connected resistive layer making electrical heating of the layer element (16) possible.

Abstract: A device for cooling electric or electronic devices includes a heat exchanger and a adapter means connected to the heat exchanger via a fluid line for connecting the heat exchanger to the electric or electronic device. The heat exchanger, the fluid line and the adapter means contribute to a closed fluid circuit through which a primary fluid may be driven from an output of the heat exchanger to the device and from the device to the heat exchanger, so that waste heat from the device may be transported to the heat exchanger and there be given off to a secondary fluid.

Abstract: An air conditioning system has a refrigerant cycle, a coolant cycle, a refrigerant/coolant heat exchanger, coupling these cycles so as to transfer heat, and a valve for operating mode-dependent control of the refrigerant flow, whereby the air conditioning system can be operated not only in air conditioning mode but also in a heat pump or reheat mode. An internal combustion engine exhaust gas/coolant heat exchanger is connected upstream in series to the refrigerant/coolant heat exchanger in the coolant cycle in the heat pump mode; and/or in the reheat operating mode the refrigerant/coolant heat exchanger functions as a condenser/gas cooler, connected upstream in series on the coolant side to the supply air/coolant heat exchanger. In addition or as an alternative, a drying operating mode can be provided for drying the supply air/refrigerant heat exchanger with reversed air conveying direction.

Abstract: A baking system includes a heat pipe including a top surface for receiving a wafer to be baked, the heat pipe to be filled with a predetermined amount of working fluid and having wicks formed on sides and a ceiling thereof for supplying the working fluid, a heater for heating the top surface by heating the working fluid, a subsidiary cooling system, which contains a liquid coolant that is to be exchanged with the working fluid from the heat pipe through circulation, a connection pipe for providing fluid communication between the heat pipe and the subsidiary cooling system to circulate the working fluid and the liquid coolant, and a control unit, which is installed in the connection pipe, for controlling a flow of the working fluid and the liquid coolant through the connection pipe.

Abstract: A heat exchange method and apparatus having a cooled fluid flowing in contact with a first surface of a heat exchange wall and a cooling fluid flowing in contact with a second surface of the wall. At least one temperature sensor is located to directly monitor the temperature of the first surface. Flow of the cooling fluid is throttled when the temperature of the first surface drops at least 50 degrees below the freezing temperature of the cooled fluid.

Abstract: A heat circulation apparatus includes a housing that has a perimeter wall for defining an interior space. The interior space includes an intake port and an exhaust port. The housing is designed for positioning under the steam radiator. A fan member is rotatably coupled to the housing such that the fan member is positioned in the interior space of the housing. The fan member is for drawing air through the intake port into the interior space of the housing and forcing air out of the interior space of the housing through the exhaust port. The fan member is designed for drawing cooler air into the housing and forcing the air out of the housing to be warmed by the steam radiator when the fan member is rotated with respect to the housing.

Abstract: A truck-mounted carpet-cleaning system that replaces the separate heat exchangers used in conventional systems having a single unit. It also merges several exhausts before they are used in the exchanger. This allows the system to be able to better regulate the temperature of the water. This improved regulation eliminates the need for a water bypass system. Because of the improved heat exchange system, the solenoids, sensors, thermo relief valves, bypass orifices and other components found in traditional systems can be eliminated. This results in a more reliable system, with more tightly regulated water temperature.

Abstract: An environmental air treatment system has a living space, a rooftop combination air intake and exhaust housing with an internal hollow chamber, and a thermal exchange unit within the chamber forming intake and exhaust sides and openings. A plurality of ducts form a continuous duct work system and have a plurality of duct work registers. An air movement fan housing is coupled to the duct work and the registers. Within the fan housing are a plurality of components: a fan, fan motor, a plurality of heat exchange units, and a plurality of pipe connections coupling with the heat exchange units. A hot water source and a cold water source are coupled to the heat exchangers. A thermostat is electronically controlled. A plurality of water mixing valves are coupled in-line of the hot and cold water supply pipes.

Abstract: A work machine, such as a wheeled loader or dumper, has a cooling and heating system comprising a main line (2) arranged to contain a fluid, a first heat exchanger (4) which is connected to the main line (2), and a charge-air cooler (8) for cooling compressed charge air for an internal combustion engine (12) arranged in the machine, which charge-air cooler (8) is connected to the main line (2). A second heat exchanger (10) is connected to the main line (2) downstream of the charge-air cooler (8), to which second heat exchanger (10) a hydraulic liquid line (14) is connected, so that heat can be transferred between the fluid in the main line (2) and the hydraulic liquid in the hydraulic liquid line (14).

Abstract: The invention relates to a controlling method of the discharge of coolant medium, and more particularly to a controlling method of the discharge of coolant medium in the heat exchange wind box. By mainly controlling the discharge of coolant medium in the heat exchange wind box, it is able to directly control the volume of discharged coolant medium that supplies the circulation need of the heat exchange tube according to the variations of the target volumes of environmental heat energy in the freezing and air-conditioning area. Therefore, it increases the operation efficiency of the freezing and air-conditioning equipment and achieves the heat balance stability of the freezing and air-conditioning area. Furthermore, by saving the circulated volume of the coolant medium, it achieves the energy saving objective.

Abstract: A method of controlling temperature of a heat source in contact with a heat exchanging surface of a heat exchanger, wherein the heat exchanging surface is substantially aligned along a plane. The method comprises channeling a first temperature fluid to the heat exchanging surface, wherein the first temperature fluid undergoes thermal exchange with the heat source along the heat exchanging surface. The method comprises channeling a second temperature fluid from the heat exchange surface, wherein fluid is channeled to minimize temperature differences along the heat source. The temperature differences are minimized by optimizing and controlling the fluidic and thermal resistances in the heat exchanger. The resistances to the fluid are influenced by size, volume and surface area of heat transferring features, multiple pumps, fixed and variable valves and flow impedance elements in the fluid path, pressure and flow rate control of the fluid, and other factors.

Abstract: A heat exchanger apparatus and method of manufacturing comprising: an interface layer for cooling a heat source and configured to pass fluid therethrough, the interface layer having an appropriate thermal conductivity and a manifold layer for providing fluid to the interface layer, wherein the manifold layer is configured to achieve temperature uniformity in the heat source preferably by cooling interface hot spot regions. A plurality of fluid ports are configured to the heat exchanger such as an inlet port and outlet port, whereby the fluid ports are configured vertically and horizontally. The manifold layer circulates fluid to a predetermined interface hot spot region in the interface layer, wherein the interface hot spot region is associated with the hot spot. The heat exchanger preferably includes an intermediate layer positioned between the interface and manifold layers and optimally channels fluid to the interface hot spot region.

Abstract: Air temperature is adjusted by employing a tangential fan having a vertically-oriented axis to direct air over a coil assembly, directing a fluid through the coil assembly, and adjusting the temperature of the fluid to cool or heat the air, wherein the coil assembly provides thermal communication between the air and the fluid.

Abstract: A temperature control system includes an enclosure having a plurality of adjoining walls. At least one inlet is disposed within at least one of the walls. The at least one inlet has an electrically controlled inlet fan associated with it. A plurality of outlet louver assemblies are disposed within at least an other wall and include a plurality of moveable louvers. An actuator is coupled with each outlet louver assembly to move the plurality of moveable louvers. An ambient air sensor is disposed within the enclosure for sensing the ambient temperature within the enclosure and providing an output signal which is conducted to an electrical processing circuit. Alternatively, the ambient air sensor may be located without the enclosure. Temperature sensors are also coupled with the engine, charge air and transmission cooler for sensing their respective temperatures and providing output signals which are conducted to the electrical processing circuit.

Abstract: An improvement in defrosting an air-to-air heat pump system when in the heating mode. A bypass loop transfers refrigerant that is at a higher temperature and pressure than refrigerant normally cycled through the outdoor unit and transfers it to the outdoor coil. This higher temperature refrigerant can then defrost the outdoor coil and any ice that has been formed on the outdoor coil by heating it as the refrigerant passes through it. The bypass loop includes a valve that is capable of being controlled remotely, the valve being movable from a closed position to an open position. A sensor is positioned to monitor a preselected condition indicative of performance of the outdoor unit. The performance of the outdoor unit is an effective way of determining whether icing is inhibiting its operation. A controller is in communication with both the valve and the sensor.

Abstract: A heat exchange method and apparatus having a cooled fluid flowing in contact with a first surface of a heat exchange wall and a cooling fluid flowing in contact with a second surface of the wall. At least one temperature sensor is located to directly monitor the temperature of the first surface. Flow of the cooling fluid is throttled when the temperature of the first surface drops at least 50 degrees below the freezing temperature of the cooled fluid.

Abstract: A method for regulating a fan in a compressor unit which having at least one compressor element, a motor connected to the compressor element, and a cooler including at least one radiator and a fan cooperating therewith; driven by a motor. The motor of the compressor element is driven at a speed varying as a function of it's a load and the number of revolutions of the motor of the fan is regulated as a function of a selected lever of cooling, thereby mitigating condensation of moisture by excessive cooling. The unit includes a speed regulation device connected to the motor of the compressor element.

Abstract: A temperature control system includes an enclosure having a plurality of adjoining walls. At least one inlet is disposed within at least one of the walls. The at least one inlet has an electrically controlled inlet fan associated with it. A plurality of outlet louver assemblies are disposed within at least an other wall and include a plurality of moveable louvers. An actuator is coupled with each outlet louver assembly to move the plurality of moveable louvers. An ambient air sensor is disposed within the enclosure for sensing the ambient temperature within the enclosure and providing an output signal which is conducted to an electrical processing circuit. Alternatively, the ambient air sensor may be located without the enclosure. Temperature sensors are also coupled with the engine, charge air and transmission cooler for sensing their respective temperatures and providing output signals which are conducted to the electrical processing circuit.

Abstract: A method of exchanging heat is disclosed. Process fluid is passed through a dry indirect contact heat exchange section while a main air stream is also passed through that section. The process fluid is passed through a second indirect contact heat exchange section while a second air stream is passed through that section. A third air stream is passed through a direct contact heat exchange section and mixed with the second air stream to define the main air stream. Evaporative liquid is selectively distributed over the second indirect contact heat exchange section and over the direct heat exchange section. The distribution of evaporative liquid over one section is independent of the distribution of evaporative liquid over the other section.

Abstract: An air supply control device for use in the heating, cooling, and conditioning of an air supply to a predetermined temperature. The device includes a cooling unit that is adapted to cool the air passing through the unit. The device incorporates a variable speed cooling fluid pump that pumps cooling fluid through a heat exchanger in the cooling unit, and a variable frequency drive (“VFD”) that is electrically connected to the pump and which can vary the speed of the pump. The device also incorporates a temperature sensor that is positioned to detect the temperature of the air after it has passed through the cooling unit. A programmable logic controller (“PLC”) is included in the device and is in electronic communication with the temperature sensor and the VFD. The PLC is programmed to vary the speed of the cooling fluid pump to adjust the temperature of the air passing through the cooling unit to the predetermined temperature.

Abstract: A catalytic combustion heater having, in a fuel gas flow passage in which an inflammable gas- and combustion support gas-containing fuel gas flows, tubes in which an object fluid to be heater flows, and an oxidation catalyst provided on outer surfaces of the tubes and contacting the fuel gas to generate an oxidation reaction, comprising a catalyst-carrying heat exchanger adapted to heat the object fluid with the oxidation reaction heat of the fuel gas, a detecting member adapted to detect the temperature of a combustion exhaust gas in the fuel gas flow passage to check whether the temperature is at the level of a dew point thereof or not, and a control unit adapted to control at least one of a feed rate of the combustion support gas, which is supplied to the fuel gas flow passage, and a feed rate of the inflammable gas.

Abstract: A low-cost vehicle air-conditioning apparatus for idle stopping vehicles is capable of performing both cooling and heating operations throughout the year. The air-conditioning apparatus includes an engine-driven compressor and engine-driven pump for a heating unit. The air-conditioning apparatus includes a motor-driven compressor and pump. A control unit drives the motor such that the motor-driven compressor is operated when there is a need for cooling and the motor-driven pump is operated when there is a need for heating when the engine is stopped. Battery power is conserved through various methods.

Abstract: A temperature control system comprises a reservoir that is holding a hot fluid; a heat exchanger, for an electronic component, coupled to an input conduit that carries the hot fluid from the reservoir into the heat exchanger; an output conduit coupled to the heat exchanger, that carries the hot fluid from the heat exchanger back to the reservoir; a first temperature sensor, coupled to the input conduit; and a second temperature sensor, coupled to the output conduit. A heater is coupled to the output conduit which adds heat to the hot fluid in the output conduit in response to a heater control signal; and a cooler is coupled to the reservoir which adds cold fluid to the reservoir in response to a cooler control signal. A temperature controller generates the heater control signal and the cooler control signal as respective functions of both sensed temperatures.

Abstract: A fan cooling system for cooling heat transfer devices associated with a particular work machine, the system including a plurality of fans positioned and located in the same plane preferably one on top of the other, a first heat transfer device positioned upstream relative to the plurality of fans, a second heat transfer device positioned downstream and adjacent to one side of the fans, a third heat transfer device positioned downstream and adjacent the opposite side of the fans, and suitable shrouds or other separating members positioned around the plurality of fans so as to guide the flow of air into and expelled by each respective fan, the fans being operable to as to create air flow through the first, second and third heat transfer devices.

Abstract: A catalytic combustion heater having, in a fuel gas flow passage in which an inflammable gas- and combustion support gas-containing fuel gas flows, tubes in which an object fluid to be heater flows, and an oxidation catalyst provided on outer surfaces of the tubes and contacting the fuel gas to generate an oxidation reaction, comprising a catalyst-carrying heat exchanger adapted to heat the object fluid with the oxidation reaction heat of the fuel gas, a detecting member adapted to detect the temperature of a combustion exhaust gas in the fuel gas flow passage to check whether the temperature is at the level of a dew point thereof or not, and a control unit adapted to control at least one of a feed rate of the combustion support gas, which is supplied to the fuel gas flow passage, and a feed rate of the inflammable gas.

Abstract: A catalytic combustion heater having, in a fuel gas flow passage in which an inflammable gas- and combustion support gas-containing fuel gas flows, tubes in which an object fluid to be heater flows, and an oxidation catalyst provided on outer surfaces of the tubes and contacting the fuel gas to generate an oxidation reaction, comprising a catalyst-carrying heat exchanger adapted to heat the object fluid with the oxidation reaction heat of the fuel gas, a detecting member adapted to detect the temperature of a combustion exhaust gas in the fuel gas flow passage to check whether the temperature is at the level of a dew point thereof or not, and a control unit adapted to control at least one of a feed rate of the combustion support gas, which is supplied to the fuel gas flow passage, and a feed rate of the inflammable gas.

Abstract: Decentralized centrifugal pumps (62) with variable speed drivers located at cooling or heating coils (74) are utilized to circulate and regulate liquid through the coils, main supply line (42), and main return line (48). Pump speed is controlled to satisfy temperature or pressure settings of a control agent served by the coil. Central distribution pumps, modulating control valves, and balancing valves are no longer required to circulate and regulate the flow. Without the balancing valves and control valves, there will be less pressure drops and waterpower losses in the piping system. Thus, the decentralized pumping system will require less pump power and energy consumption than the central pumping system.