Abstract: A method and means for extracting heat from an exhaust stack under highly corrosive and fluctuating conditions. An in-line exhaust gas heat exchanger having selective dual concentric exhaust paths and having a plurality of longitudinal structural stringers to insure against weakening of the exhaust stack. A plurality of heat exchanger coils are located in the outermost exhaust path and means is provided for fully draining the liquid contents thereof. Temperature control method means is provided for regulating the temperature of fluid within the coils due to exhaust stack temperature fluctuations for controlling critical dew point situations.

Abstract: A solar efficient structure is disclosed which comprises a central chase positioned vertically within the structure and connected in fluid communication with a duct network positioned in thermal contact with the ground and with the attic of the structure. A fan is provided for circulating air through a perforated attic duct, through the various rooms of the structure, and through the duct network and the chase. In one embodiment, the fan is reversible so as to circulate the air in one direction, or in the other direction. When operating in the heating mode, the ground acts as a heat source to heat the air circulating through the duct network. Conversely, when operating in the cooling mode, the ground acts as a heat sink to cool the airflow circulating therethrough. A dehumidifier, and a heating or cooling means is provided for assisting in the conditioning of the circulating airflow.

Abstract: A fuel/oil heat exchange system is proposed for an aircraft gas turbine engine for heating fuel leaving the aircraft fuel tanks before it enters the engine fuel system. The proposed system eliminates the separate fuel heater. The oil system is designed so that the fuel is not overheated at the hottest engine conditions, and the fuel/oil heat exchange system is made to increase the temperature of the oil if the fuel temperature drops below a pre-determined limit.Referring to FIG. 2 of the drawings, oil from the engine gearbox 16 is passed by scavenge pump 20 to a fuel heating coil 14 in the heat exchanger 12. Fuel from the aircraft passes through the heat exchanger prior to entering the fuel system 7 through fuel filter 6. A temperature sensing device 26 signals a reduction in fuel temperature below a desired level and closes a valve 24 preventing oil passing beneath baffle 25 to the scavenge pump.

Abstract: A regenerative room air exchanger for use in a house has a first vertically disposed conduit through which room air flows to be exhausted, the first conduit including a first set of vertically disposed channels, a second vertically disposed conduit through which fresh air flows to the room, the second conduit including a second set of vertically disposed channels with the first and second sets of channels being interdigitated and in counterflow heat exchange relationship with each other, and a jacket surrounding and spaced from the interdigitated channels to form a third vertically disposed conduit between the jacket and the channels, the third conduit being in fluid communication with the first conduit. An exhaust blower is in fluid communication with the first conduit and an inlet blower is in fluid communication with the second conduit.

Abstract: In a temperature control unit for a vehicular air conditioning unit including a blast unit and control for the blowoff temperature thereof, a control circuit is provided with a variable gain so that the gain is increased when the blast unit blows air with a high velocity and is decreased when the blast unit blows air with a low velocity whereby a temperature control which does not cause discomfort to a human body may be carried out promptly and automatically. The variable gain of the control circuit may be provided in the form of a feedback loop of the control circuit with at least one of variable resistance or capacitance so as to vary the time constant of the feedback loop and therewith the gain in accordance with the air velocity.

Abstract: A heat exchanger for cryosurgical instruments comprises a mantle containing individual layers of a heat exchange substance, such as a heat exchange material or a heat exchange filler, an outer jacket surrounding the mantle, a contact zone within the outer jacket for receiving cooling fluid, and a heat detector in thermal contact with the outer jacket but separated by the mantle from the cooling fluid contact zone. Each of the individual layers of heat exchange substance is positioned within the mantle a spaced distance from every other individual layer, so that these individual layers of heat exchange substance are mutually separated from one another.

Abstract: The invention relates to air preheaters and discloses a preheater in which the air is heated in two stages of heat exchange, the heat source being flue gases. Air to be heated is passed along a path having two portions. Air in the second portion is in heat exchange relation with the flue gases and air in the first portion is in heat exchange relation with air in the second portion. By this means, direct heat exchange between flue gases and cold air is avoided, with the consequent reduction in the risk of condensation of harmful fluids from the flue gases. The respective portions of the air flow path are normally one within the other, enabling the conduit defining the inner portion to be removed without interfering with the flue gas ducting.

Abstract: Apparatus and a method for providing failsafe supplemental heat operation of an air conditioning control are disclosed. Operating power to a microprocessor control is discontinued when the air conditioning unit is placed in a supplemental heat mode by the user. The microprocessor control is so arranged that appropriate connections are made to operate a supplemental heat source in response to a first stage heating need being sensed by the thermostat when operating power to the microprocessor control is discontinued. Under normal conditions multiple stage heating operation is provided with a supplemental heat source being operated under control of a programmed microprocessor.

Abstract: A radiant tube to be heated by high-temperature gases supplied from its one end. The tube supplys a heat radiation by being thus heated. The gases used for the heating are discharged from the other end of the tube. Inside the tube a heat exchanger is provided in the proximity of the gas outlet of the tube so as to recover thermal energy from the used gases before they come out from the outlet.

Abstract: A shell and tube type heat exchanger having one or more intermediate baffles through which the tubes pass, with the tubes being secured at the baffles to prevent or reduce the probability of potentially damaging vibrations. Each baffle comprises a plurality of parallel plates placed closely adjacent each other or sandwiched together and having clearance holes through which the tubes pass. Individual plates of a baffle are offset in different directions and secured in the offset position to secure the tubes by the opposing engagement of the edges of their clearance holes.

Abstract: Apparatus for installing a condition-sensing element or the like in a heat exchanger, such as a radiator, comprising an elongated probe containing the sensing element, and a device securing the probe in a space defined between two adjacent cooling fins in the heat exchanger. The latter device comprises an elongate member dimensioned for insertion through one of the interfin spaces, and a pair of retention elements attached to either end of the elongate member. The retention elements have apertures for receiving the probe when the probe is inserted through an inter-fin space proximate the space through which the elongate member is inserted. The retention elements are lockable into a position of engagement with either side of the heat exchanger, and, when so locked in position, capture the probe so as to retain it in place. The retention elements are dimensioned to block the flow of air through the inter-fin spaces adjacent to the probe.

Abstract: A vehicle air conditioner control apparatus for supplying into the passenger compartment of a vehicle a flow of air which is temperature controlled in accordance with air conditioner control conditions, automatically controls an air change-over damper in response to a manual setting device for selectively commanding the induction of outside air, the induction of inside air and the induction of outside and inside air into an air duct and in response to a signal indicative of an absolute temperature of air inducted into the air duct, which is computed and generated in accordance with the outputs of a plurality of sensors.

Abstract: An improved conduction cooling system for a semiconductor package that includes a slidable conduction cooling piston in contact with a device and mounted in a cap or cold plate, a means for urging the piston longitudinally and laterally into contact with the device and the cap or cold plate, respectively, and a means to prevent rotation of the piston.

Abstract: A device for air control for an air ventilated room is provided with an outer pane on its weather side and at its room side with an inner pane. An air channel is formed between the panes for the exhausted room air and a fresh air channel with a weatherside fresh air suction opening and a room side fresh air discharge opening is provided in connection with the air channel. The air channel is connected to a weather side exhaust air opening on its downflow side and is also in connection with a heat exchanger disposed in front of the weather side exhaust air opening through which the exhaust air can transmit heat to the fresh air flowing through the fresh air channel. The air control device is a compact structural unit and is exclusively disposed on the inside of the room. The compact structural unit comprises a separate air control box and a ventilator box.

Abstract: A device for controlling the temperature of rooms in a building comprising curtain walls having a skeleton made up of columns and horizontal members to which facade elements and, if required, window surfaces are secured so as to be substantially free from heat bridges, comprising a temperature-control facility substantially in the form of a pipeline system in which a heat transfer fluid flows, said pipeline system being constructed and arranged to dispose inside the room and adjacent the skeleton of columns and horizontal members and relative to the skeleton so as to produce a thermal coupling between the skeleton and the temperature control facility. In certain applications the temperature control facility is disposed at a relatively short distance from and in facing relation to the skeleton in an arrangement producing a close radiation coupling between the skeleton and the temperature control facility.

Abstract: Air conditioning apparatus for conditioning the air supplied to a vehicle passenger space is provided which includes an air conditioning air cooling evaporator and an air heater unit arranged in series. An evaporator bypass duct extends in bypassing relationship to the evaporator and a heater bypass duct extends in bypassing relationship to the heater. To control the temperature of the air conditioned by the apparatus two temperature mixing air flaps are provided, one air flap controlling the proportion of air flow through the evaporator and its bypass duct and the other air flap controlling the proportion of air through the heater and its bypass duct.

Abstract: An improved heat exchanger in which a liquid is cooled by contacting a surface to crystallize a component therefrom by indirect heat exchange with a fluid on the otherside of the surface, having a layer of a polymeric material, to which the crystallized component does not significantly adhere, on the surface which contacts the liquid, and with said layer being sufficiently thin for efficient heat transfer through the surface.An improved method of crystallizing a component from a liquid by indirect heat exchange by passing the liquid into contact with a surface covered with a thin layer of a polymeric material to which the crystals do not substantially adhere, and cooled by a cooling fluid which is sufficiently cold to cool the liquid to a temperature low enough to form crystals as the liquid contacts the surface.

Abstract: A metal recuperator is described as having an exterior casing with a replaceable inner housing which forms with the casing a pair of separated fluid passageways through which two fluids, at different temperatures, are circulated into heat exchanging relationship. Special seals are provided to allow relative movement between the casing and the housing while sealing the passageways from each other and the ambient atmosphere.