Abstract: A heat exchanger with a multi-zone heat transfer surface is disclosed. The heat exchanger includes a fluid flow passage extending between and interconnecting a fluid inlet and a fluid outlet. A heat transfer surface is disposed within the fluid flow passage wherein the heat transfer surface includes at least one heat transfer-reducing zone disposed in thermal contact with a portion of at least one of the walls of the fluid flow passage and at least one heat transfer-augmenting zone disposed in thermal contact with a portion of the at least one of the walls of the fluid flow passage. The configuration of the heat transfer-augmenting zones with the heat-transfer-reducing zones is such that heat transfer across the surface of the heat exchanger in contact with the heat transfer-augmenting zones is increased relative to the heat transfer across the surface of the heat exchanger in contact with the heat transfer-reducing zones.

Abstract: A system, method, and WiFi test chamber. The WiFi test chamber includes a case defining a number of isolation chambers. The case is configured to prevent radio frequency signals from entering the number of isolation chambers. The WiFi test chamber includes a number of wireless access points (WAPs) with one of the wireless access points in each of the number of isolation chambers. The WiFi test chamber includes interfaces extending from the exterior from the case and connected to the plurality of WAPs.

Abstract: A fluid heater for a heating fluid and having a fluid inlet and a fluid outlet may comprise a heater housing defining an interior with a combustion chamber being positioned in the interior of the housing, and fluid tubing in the interior of the housing and adjacent to the combustion chamber, with the fluid tubing defining a fluid path through the housing between the fluid inlet and the fluid outlet. The heater may also include a burner configured to combust a fuel in the combustion chamber to heat the fluid tubing. At least a portion of the fluid path may comprise a bifurcated fluid path between the fluid inlet and the fluid outlet.

Abstract: By a feedback arithmetic operation based on a temperature deviation, an input number is set which corresponds to a requested heat quantity generation, which is a controlled object, to a hot water supply apparatus. The temperature deviation is calculated by correcting a deviation of a tapping temperature with respect to a set hot water temperature with use of a Smith compensation temperature calculated by a Smith compensator for predicting a variation in a tapping temperature prior to an elapse of a dead time corresponding to a detection lag of the tapping temperature. The Smith compensator calculates a Smith compensation temperature to be used in the next control cycle based on the input scale number, the present Smith compensation temperature, and a time constant set in accordance with a flow rate of the hot water supply apparatus.

Abstract: A control method for a heat transfer system, wherein the heat transfer system comprises a supply conduit (12), at least one load circuit (2) and a heat transfer device (6; 28) between the supply conduit and the at least one load circuit, wherein a supply flow (qS) in the supply conduit (12) is detected on the basis of a desired entry-side load temperature (Tref), of an actual entry-side load temperature (TL) which is detected in the load circuit (2) and of a load flow (qL) in the load circuit (2), as well to as a heat transfer system, in which such a control method is applied.

Abstract: A system for regulating the temperature and flow rate of a heat transfer fluid for use in a hybrid steam-generating plant is described. A bypass section may be incorporated into the piping network of a primary steam-generating source to route heat transfer fluid from a hot source to a mixer downstream of at least one heat exchanger. Heat transfer fluid from the hot source may be mixed with cooler heat transfer fluid exiting the heat exchanger in the event that the supply from a secondary steam-generating source is lost or becomes intermittent. The result is a system that maintains a constant flow rate of heat transfer fluid through the heat exchangers while minimizing adverse temperature gradient effects that may result from steam production variability and plant operation outside of design point parameters.

Abstract: Method of controlling a variable delivery pump fitted to a heating system comprising: a heat exchanger connected to two circuits of fluids, the variable delivery pump making it possible to vary the flow-rate of the first fluid inside the heat exchanger; a return loop on the primary circuit allowing the first fluid reaching the input of the heat exchanger to mix with a portion of the first fluid coming from the output of the exchanger; a first temperature sensor measuring a temperature of the second fluid coming from the secondary circuit; a second temperature sensor measuring a temperature of the first fluid coming from a primary circuit; a control unit electrically connected to the first and second temperature sensors, the sensors generating electrical signals as functions of the temperatures and constituting electrical input signals of the control unit.

Abstract: Method of controlling a variable delivery pump fitted to a heating system comprising: a heat exchanger connected to two circuits of fluids, the variable delivery pump making it possible to vary the flow-rate of the first fluid inside the heat exchanger; a return loop on the primary circuit allowing the first fluid reaching the input of the heat exchanger to mix with a portion of the first fluid coming from the output of the exchanger; a first temperature sensor measuring a temperature of the second fluid coming from the secondary circuit; a second temperature sensor measuring a temperature of the first fluid coming from a primary circuit; a control unit electrically connected to the first and second temperature sensors, the sensors generating electrical signals as functions of the temperatures and constituting electrical input signals of the control unit.

Abstract: A zoned HVAC system comprises an HVAC unit including a climate control system and an air mover. In addition, the system comprises a supply air duct in fluid communication with the outlet of the HVAC unit. Further, the system comprises a return air duct in fluid communication with the inlet of the HVAC unit. Still further, the system comprises a plurality of zones positioned between the supply air duct and the return air duct. Moreover, the system comprises a bypass duct extending between the supply air duct and the return air duct. The bypass duct includes an active bypass damper having an open position, a closed position, and a plurality of partially opened positions. The system also comprises a control device configured to control the position of the bypass duct.

Abstract: A temperature control system includes a first temperature adjustment unit storing fluid at a first temperature; a second temperature adjustment unit storing fluid at a second temperature higher than the first temperature; a low-temperature flow path for passing fluid supplied from the first temperature adjustment unit; a high-temperature flow path for passing fluid supplied from the second temperature adjustment unit; a bypass flow path for circulating fluid; a combination flow path for passing fluid from the low-temperature flow path, the high-temperature flow path, and the bypass flow path merged at a merging part; a temperature adjustment part that passes fluid from the combination flow path and cools/heats a member of a semiconductor manufacturing device; and a control device that controls valve positions of variable valves attached to the three flow paths upstream of the merging part and adjusts the flow rate distribution ratio for the three flow paths.

Abstract: A system for cooling an engine is described. The system includes a heat exchanger having a first heat exchange portion that removes heat energy from coolant fluid flowing therein, and a second heat exchange portion that removes heat energy from coolant fluid flowing therein; a first thermostat integral to the heat exchanger and fluidically and mechanically coupled to at least one of the first and second heat exchange portions; and a second thermostat, integral to the heat exchanger and fluidically and mechanically coupled to at least one of the first and second heat exchange portions.

Abstract: A brewing process including taking off a fluid having a starting temperature from a heat store; feeding the fluid to a plurality of heat consumers for releasing heat; and returning to the heat store the fluid which has a final temperature. The brewery installation has a heat store for controlling the flow of the fluid in the installation, and a plurality of heat consumers each of which is connected to the primary circuit for releasing heat. Improved efficiency is achieved in part by the final temperature of the fluid which flows out of the respective heat consumers is measured and the return of the fluid is controlled as a function of the measured final temperature.

Abstract: In an exemplary embodiment, a method to control excessive temperature changes in a coolant circuit includes providing a coolant circuit including a bypass flow pathway bypassing a heat exchanger, said coolant circuit at an elevated operating temperature; providing an adjustable coolant flow through said bypass flow pathway and said heat exchanger; providing a coolant pump in said coolant circuit; determining a temperature change in said coolant circuit in response to initiating a coolant flow from said heat exchanger into said coolant circuit, said temperature change greater than a predetermined limit; and in response to said determined temperature change, adjusting at least one or more of said coolant pump speed and said coolant flow to maintain said coolant circuit within a predetermined temperature range.

Abstract: A vehicle cooling system comprises a vehicle unit, a heat exchanger, a cooling fan, a coolant pump, a three-way valve, and a control unit. The heat exchanger is arranged in the coolant route to selectively receive a coolant from the coolant outlet of the vehicle unit. The cooling fan is arranged to blow cooling air to the heat exchanger. The coolant pump is arranged to circulate the coolant through the coolant route. The three-way valve is arranged to switch the coolant route between a heat exchanger route that passes through the heat exchanger and a bypass route that bypasses the heat exchanger. The control unit is configured to control operation of at least one of the cooling fan, the three-way valve and the coolant pump based on a temperature of the coolant at the heat exchanger and a temperature of the coolant at the coolant outlet of the vehicle unit.

Abstract: A heat exchanger structure of an automatic transmission stabilizing a temperature of oil is provided. A heat exchanger structure of an automatic transmission includes an automatic transmission, a first heat exchanger provided on an upstream side and a second heat exchanger provided on a downstream side, each capable of cooling oil ejected from the automatic transmission, and a thermo valve capable of supplying oil subject to heat exchange by at least one of first and second heat exchangers to the automatic transmission. When a temperature of the oil is relatively low, the thermo valve supplies oil passed through the first heat exchanger to the automatic transmission and shuts off a flow of oil from the second heat exchanger to the automatic transmission. When a temperature of the oil is relatively high, the thermo valve supplies oil passed through first and second heat exchangers to the automatic transmission.

Abstract: An improved shell-and-tube steam instantaneous heat exchange system of a closely coupled feedback design which overheats water in the heat exchanger portion of the system and then blends the water, as needed, with proportional amounts of cold water to achieve the correct outlet temperature for a wide range of flow rates. The system uses at least two primary heat exchangers to provide redundancy in the case of failure of a major component of the system. Steam flow through the heat exchangers is controlled by the use of steam traps, rather than using a thermostatically controlled valve to vary the supply of steam. To obtain precise temperature control during varying water volume use, water is directed from the blended outlet of a first water tempering valve into the hot inlet port of a second water tempering valve.

Abstract: A heat exchanger including an inlet port, an outlet port, a header, a plurality of cooling tubes, and a thermal bypass valve integrated therein. The thermal bypass valve is located in the header and is configured to restrict the flow of fluid through the cooling tubes of the heat exchanger below a target fluid temperature. The thermal bypass valve includes a valve body that is movable between first and second operational modes to restrict and not restrict the flow of fluid.

Abstract: An improved shell-and-tube steam instantaneous heat exchange system of a closely coupled feedback design which overheats water in the heat exchanger portion of the system and then blends the water, as needed, with proportional amounts of cold water to achieve the correct outlet temperature for a wide range of flow rates. The system uses at least two primary heat exchangers to provide redundancy in the case of failure of a major component of the system. Steam flow through the heat exchangers is controlled by the use of steam traps, rather than using a thermostatically controlled valve to vary the supply of steam. To obtain precise temperature control during varying water volume use, water is directed from the blended outlet of a first water tempering valve into the hot inlet port of a second water tempering valve.

Abstract: A spray cooling system for extreme environments for providing a desired enclosed environment for electronic devices regardless of external environmental conditions. The spray cooling system for extreme environments includes an enclosure that isolates the electronic components from the external environment, a spray unit within the enclosure for thermally managing one or more electronic devices, a pump unit fluidly connected to the spray unit, a heat exchanger unit fluidly connected to the pump, and a control valve fluidly connected between the heat exchanger unit and the pump. An independent chamber preferably houses a heater unit, a first power supply and a control unit, whereby the heater unit initially heats the coolant within the independent chamber to a minimum operating temperature prior to operation of the electronic components.

Abstract: A computer component mounting apparatus includes a bracket assembly (200) secured in a computer chassis (10), and a top panel (30) attached to the bracket assembly. The bracket assembly includes a first bracket for receiving fans (50) therein. The first bracket includes a pair of side panels (21), and a number of spaced beams (25) connecting top extremities of the side panels. A pair of retaining tabs (26) depends from opposite side edges of each beam. A number of supporting tabs (24) are formed from inner surface of the side panels in the bottom. The fans are disposed in the first bracket, held by the supporting tabs and the retaining tabs. The top panel is covered on the top of the bracket assembly by fasteners to hold fans in the computer chassis.

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: Method and apparatus for heating gases cooled by an aftercooler that receives hot gases from a compressor. The method includes the steps of directing at least a portion of said hot gases to means for bypassing the aftercooler, and using the bypass means to direct hot gases to a location that receives cooled gases from the aftercooler. The hot gases are used at the location to heat the cooled gases when ambient temperature is at or below freezing, and are used downstream from the aftercooler when moisture freezes in the aftercooler.

Abstract: A temperature control and process for adjusting the temperature of a workstation and a work medium at a workstation to a predetermined temperature. The temperature control comprises a cooling vehicle such as a heat exchanger, a coolant temperature sensor and control, a source of fluid coolant such as a manifold, a recirculating pump, a flow line to circulate the coolant to the workstation with the flow line containing a flow regulator and a heater, a bypass valve for bypassing the flow regulator and heater, and a workstation temperature sensor and control. The workstation temperature control controls the operation of the heater and bypass valve so that the temperature of the coolant is below the desired temperature for the workstation, thus achieving a rapid transient response while avoiding overcooling. The coolant temperature control and workstation temperature control may be in a temperature control computer, thus providing a large number of different operating sequences.

Abstract: An apparatus providing effective control of fluid temperature to achieve temperature control precision of ±0.1° F. at flow rates exceeding five gallons/minute includes a hot and a cold reservoir of process fluid maintained at their desired temperatures by a high-accuracy industrial chiller and an industrial heater, respectively. A control valve mixes fluid from the reservoirs to produce a precisely controlled stream of process fluid delivered to the point of usage. Another flow control valve maintains system flow at a precise value.

Abstract: A U flow radiator 10 with a header tank 12 split into inlet and outlet sides I and O by a lengthwise divider wall 18 has a coolant inlet consisting of a cylindrical pipe 22. A hollow cylindrical barrel 24 co extensive and coaxial with pipe 22 and extending across divider wall 18, with cut outs 26 and 28 opening respectively into both sides I and O. A thin walled, hollow cylindrical sleeve 30 turns within barrel 24 with windows 36 and 38 that alternately block or open the cut outs 26 and 28, or open both partially. A rotary actuator 40 turns sleeve 30 within barrel 24. Coolant can be selectively routed all to the tank outlet side O, by passing the radiator 10 for quick warm up. After warm up, coolant can be routed to I or O in desired proportions to increase or decrease cooling capacity. With high engine cooling demand, all coolant is routed to the inlet side I and all coolant passes through radiator 10.

Abstract: A flash water heater using a heat pump includes a heat exchanger in which a refrigerant flow path exchanges heat with a water flow path. Tap water is led directly to the water flow path, and hot water supplied from the water flow path is used. The water heater includes at least one of the following elements: 1) a load setter for setting a heating amount in the heat exchanger, and a heating controller for regulating a heating amount in response to an amount set by the load setter; 2) a heater for heating water flowing through the water flow path in the heat exchanger and water flowing the path before and after the heat exchanger; 3) plural compressors; and 4) plural heat-pump cycles. The water heater is excellent in start-up of hot water temperature when the hot water supply starts, controllability, and efficiency.

Abstract: An air conditioner controller comprises a supply air duct with an air inlet, an air outlet and a blower. An evaporator is within the duct adjacent to the inlet. A subcooling heat exchanger is within the duct between the evaporator and the outlet. A liquid line feeds coolant from a condenser. The liquid line has a primary outlet coupled to the subcooling heat exchanger and a secondary outlet coupled to a first valve. A coupling line feeds coolant from the subcooling heat exchanger to an evaporator. The coupling line has a second valve adjacent to the subcooling heat exchanger and an intermediate line. A humidistat, under the control of an operator, controls the first and second valve to thereby vary the operating parameters.

Abstract: A VAV air handler includes a cooling coil with a return air bypass damper for improved dehumidification. The bypass interjects into the supply air a portion of relatively warm, dry return air downstream of the cooling coil. This allows the cooling coil to absorb more latent heat from the incoming outside air and the remaining portion of the return air over a broad range of operating conditions, but especially at low load conditions.

Abstract: A heat exchanger has a core provided with passages for a liquid to keep cool and passages for a cooling medium, a first collection tank for supplying the liquid, a second collection tank for withdrawing the liquid, at least one third collection tank, the core being divided into at least two sections through which the liquid successively flows and which are interconnected by the at least one third collection tank, one of the sections being connected with the first collection tank, while the other of the sections being connected with the second collection tank, a bypass line connected with the third collection tank and in parallel with the other sections, and structure for activating and deactivating the bypass lines.

Abstract: A VAV air handler includes a cooling coil with a return air bypass damper for improved dehumidification. The bypass interjects into the supply air a portion of relatively warm, dry return air downstream of the cooling coil. This allows the cooling coil to absorb more latent heat from the incoming outside air and the remaining portion of the return air over a broad range of operating conditions, but especially at low load conditions.

Abstract: An apparatus and method for improving the cleaning and deicing effectiveness of a washer fluid in a motor vehicle before spraying it against a windshield, headlamps, etc., utilizes the heat from the engine coolant to elevate the temperature of the washer fluid. In addition, a mixing valve arrangement is used to maintain the temperature of the heated washer fluid at a predetermined difference value from that of the windshield, etc., outside surface. The cleaning effectiveness of the heated washer fluid is superior to that of ambient temperature washer fluid, and is also advantageous for deicing purposes.

Abstract: An apparatus providing effective control of fluid temperature to achieve temperature control precision of ±0.1° F. at flow rates exceeding 5 gallons/minute includes a hot and a cold reservoir of process fluid maintained at their desired temperatures by a high-accuracy industrial chiller and an industrial heater, respectively. A three-way control valve mixes fluid from the reservoirs to produce a precisely controlled stream of process fluid delivered to the point of usage. Another flow control valve maintains system flow at a precise value.

Abstract: In an air feeder for supplying air with a predetermined temperature and humidity into a cup in a resist coating unit provided in a coating and developing system, a cooling section, a by-pass, a heating section, a humidifying section, and a blower are provided. 55% of introduced air is cooled in the cooling section, 45% of the introduced air passes through the by-pass, and mixed air of the cooled air and the air from the by-pass is heated in the heating section and humidified in the humidifying section, thereby enabling energy-saving and space-saving temperature and humidity control.

Abstract: A down flow, two tank, two pass radiator includes a flow division baffle in the center of the upper tank that automatically vents any air trapped behind the baffle as the engine operates. When the engine starts, colder coolant has contracted a thermo wax operated baffle slide to an open position, allowing any trapped air to vent through. As the engine and coolant warm to normal operating temperature, the wax expands, pushes the slide closed, and the baffle operates as a solid piece.

Abstract: An air-mix door control device for an automobile air-conditioning system home-position-sets the air-mix door for the full-hot position or the full-cool position when it is necessary to control an air-mix door for a new target opening position other than a full-hot position or a full-cool position under a condition that an opening position detecting unit for detecting an opening position of the air-mix door causes a trouble. Also, the air-mix door control device calculates a reverse drive time required for reversely driving the air-mix door from the home-position-set position to the new target opening position so as to correct a time error derived from a torque variation of an air-mix door motor actuator due to a battery voltage. Thus, the air-mix door control device reversely drives the air-mix door according to the reverse drive time and controls the air-mix door for the new target opening position.

Abstract: In order to control the temperature of the transmission oil of a motor vehicle driven by a liquid-cooled engine, a coolant/transmission oil heat exchanger is provided. The coolant stream supplied to the heat exchanger is miscible in a thermostatic valve from recooled and non-recooled coolant in order to achieve a desired temperature. Preferably the thermostatic valve is controlled by the temperature of the transmission oil, but it is also possible to have two expanding material elements as control pistons of the thermostatic valve, with one control piston being provided in the oil chamber of the thermostatic valve and the other control piston being provided in the coolant mixing chamber of the thermostatic valve. It is also possible, for purposes of precontrol, to electrically heat at least one of the control pistons.

Abstract: A combined safety shower and eyewash station utilizes steam to heat water in a heat exchanger. Cool water is combined with heated water from the water outlet of the heat exchanger by a temperature-regulated mixing valve. If the water at the water outlet of the heat exchanger becomes too hot, some of the water is fed to the steam inlet of the heat exchanger. This makes it easy for the mixing valve to regulate water temperature even though the shower uses water at a much higher rate than does the eyewash station. Steam is fed to the heat exchanger through a steam valve which is opened automatically when a demand for warm water is sensed by a pressure-drop flow sensor. An overtemperature responsive actuator overrides the demand sensor to shut off the steam. A steam trap at the inlet of the steam valve eliminates cold condensate so that the apparatus is able to deliver warm water substantially immediately upon demand.