Showing papers on "Micro heat exchanger published in 1974"
108 citations
Patent•
04 Dec 1974
TL;DR: In this article, a method and apparatus for heating tap water and radiator water by means of a heat pump, and complementarily also by using a conventional fuel-fired furnace is described.
Abstract: There is provided a method and apparatus for heating tap water and radiator water by means of a heat pump, and complementarily also by means of a conventional fuel fired furnace. The condensor unit of the heat pump is divided into two heat exchangers. The first heat exchangers takes care of the superheat, and some of the condensation heat of the coolant vapor of the heat pump, and heats the tap water to a temperature which is higher than the condensation temperature. The second heat exchanger condensor heats the radiator water to a temperature corresponding to the condensation temperature of the coolant vapor.
33 citations
Patent•
17 May 1974TL;DR: In this paper, the temperature profile established across a heat exchanger, such as employed on an extrusion die, is controlled by introducing fluid into the heat exchange at a predetermined temperature.
Abstract: The temperature profile established across a heat exchanger, such as employed on an extrusion die, for example, is controlled by introducing fluid into the heat exchanger at a predetermined temperature. The temperature of the fluid withdrawn from the heat exchanger is measured, and the rate of flow of fluid through the heat exchanger is controlled in response to the measured temperature to maintain the measured temperature at a predetermined value.
24 citations
Patent•
01 Apr 1974
TL;DR: One of two axially spaced annular heat exchangers, interconnected in a closed circuit traversed by a fluidic heat carrier, serves to preheat a flow of ambient air downstream of a compressor which impels that flow toward a combustion chamber where an air-fuel mixture is ignited to drive a turbine coupled with the compressor as discussed by the authors.
Abstract: One of two axially spaced annular heat exchangers, interconnected in a closed circuit traversed by a fluidic heat carrier, serves to preheat a flow of ambient air downstream of a compressor which impels that flow toward a combustion chamber where an air-fuel mixture is ignited to drive a turbine coupled with the compressor. The other heat exchanger, which extends radially beyond the first-mentioned heat exchanger to create a thermosiphon effect for the circulation of the carrier, abstracts residual heat from the expanding gas flow downstream of the turbine. In one embodiment, the compressor and the turbine are interconnected by a central shaft surrounded by a coaxial tubular member which carries the two heat exchangers; in another embodiment this relationship is reversed.
24 citations
Patent•
Behr1
TL;DR: In this paper, the cooling radiator is used for diesel engines in which the first radiator which faces the air stream was used for cooling engine oil and the adjacent radiator was used to engine cooling water.
Abstract: The cooling radiator is used for diesel engines in which the first radiator which faces the air stream is used for cooling engine oil. The adjacent radiator is used for engine cooling water. The production of this combined radiator is simplified by using common, continuous cooling ribs for both radiators. Each separate flow path has its own heat exchanger (1, 2, 5 and 3, 4, 6). These heat exchangers are fitted closely together. These heat exchangers have common cooling ribs (7) which cover pipes of both heat exchangers. The low temp. fluid heat exchanger is arranged to face the incoming cooling air stream.
19 citations
TL;DR: Newman, R. D., Prausnitz, J. P. as mentioned in this paper, Tewari, Y. B., Schreiber, H. E., and Patterson, D., Macromolecules, 2, 672 (1969).
Abstract: Conder. J. R., Purnell. J. H., Trans. Faraday Soc.. 65, 824 (1969). Flory. P. J . , J. Chem. Phys., 9, 660 (1941). Flory, P. J . . J. Amer. Chem. SOC., 87, 1833 (1965). Flory, P. J.. Discuss. faraday Soc., 49, 7 (1970) Heil, J. F.. Prausnitz, J. M., Amer. lnst. Chem. Eng. J.. 678 (1966) Hijrnans, J., Hollernan, T., Advan. Chem. Phys.. 16, 223 (1969) Huggins, M. L.. J. Chem. Phys., 9, 440 (1941). Newman, R. D., Prausnitz, J. M., J. Phys. Chem., 76, 1492 (1972). Newman, R. D., Prausnitz, J. M., AlChEJ., 19, 704 (1973). Patterson, D.. Macromolecules, 2, 672 (1969). Patterson, D., Tewari, Y . B., Schreiber, H. P., Guillet, J. E.. Macromole(1973).
18 citations
TL;DR: In this paper, a model for calculating heat transfer in certain types of rotary heat exchangers is presented which allows for a simple way of specifying the main design parameters under given terminal conditions.
16 citations
Patent•
29 May 1974
TL;DR: The level of primary fluid is controlled to change the effective heat transfer area of a heat exchanger utilized in a liquid metal nuclear power plant to eliminate the need for liquid metal control valves to regulate the flow of primary fluids and the temperature of the effluent secondary fluid as discussed by the authors.
Abstract: The level of primary fluid is controlled to change the effective heat transfer area of a heat exchanger utilized in a liquid metal nuclear power plant to eliminate the need for liquid metal control valves to regulate the flow of primary fluid and the temperature of the effluent secondary fluid.
15 citations
TL;DR: In this article, the authors predict the condensation rate and height of a single bubble train in a counter and co-current multi-bubble system using the effect of the bubbles' spatial density, i.e. bubble frequency and horizontal spacing.
Patent•
22 Jul 1974TL;DR: A heat transfer interface between and separating a high temperature heat source and a heat sink is formed by the adjacent walls of the heat source with a thin gap between these walls and helium gas sealed in the gap, the walls preferably defining concentric hemispheres as discussed by the authors.
Abstract: A heat-transfer interface between and separating a high temperature heat source and a heat sink is formed by the adjacent walls of the heat source and heat sink with a thin gap between these walls and helium gas sealed in the gap, the walls preferably defining concentric hemispheres; this interface being particularly feasible as separable walls of the heater portion of a Stirling engine and a heat source.
Patent•
03 Jun 1974
TL;DR: A closed helium gas circulatory system includes a compressor, nuclear reactor, turbine, and heat exchanger installation serving as recuperator and precooler, the recuperative heat exchange and the precooling heat exchange of the installation both having tubes, the tubes of one of the heat exchangers being disposed concentrically or coaxially to those of the other heat exchange.
Abstract: A closed helium gas circulatory system includes a compressor, nuclear reactor, turbine, and heat exchanger installation serving as recuperator and precooler, the recuperative heat exchanger and the precooling heat exchanger of the installation both having tubes, the tubes of one of the heat exchangers being disposed concentrically or coaxially to those of the other heat exchanger.
Patent•
30 Aug 1974
TL;DR: In this article, a semiconductor device with a cooling element for transferring loss heat from a heat source in the semiconductor to a heat sink, using circulating coolant, is described.
Abstract: In a semiconductor device with a semiconductor and a cooling element for transferring loss heat from a heat source in the semiconductor to a heat sink, using circulating coolant, the semiconductor contains a capillary structure, through which the coolant flows to the heat source and is incorporating (partly) in a closed system connected to the heat sink. This arrangement is more efficient than others depending on convection, e.g. (built-in) heat pipe structures. It satisfies both the hgih electrical and the space- and weight-saving requirements.
TL;DR: In this paper, a heat sensor for uniform cooling of the fluid layer and preventing heat losses to ambient air or other parts of the apparatus is described. But this sensor is not suitable for the measurement of the heat flow through a horizontal fluid layer.
Abstract: A device is described which permits accurate measurements of the heat flow through a horizontal fluid layer. The heat sensor provides for a uniform cooling of the fluid layer and prevents heat losses to ambient air or other parts of the apparatus.
Patent•
13 Jun 1974
TL;DR: In this article, a thermal transformer in thermal contact with a heat pipe and proximately disposed to a heat source is presented, whereby a uniform heat transfer from said heat source to a heating system is obtained.
Abstract: The present invention comprises (1) a heat source, (2) a heat pipe, and (3) a thermal transformer in thermal contact with said heat pipe and proximately disposed to said heat source, whereby a uniform heat transfer from said heat source to a heating system is obtained. The thermal transformer includes (1) a container, (2) a working fluid and its vapor which are essentially in equillibrium, (3) evaporating surfaces depending from the internal surfaces of the transformer that are wetted with the working fluid and that are proximate to the heat source, and (4) condensing surfaces depending from the exterior of those areas of said heat pipe that are in thermal contact with said transformer.
TL;DR: In this article, the surface efficiencies of the parallel flow heat exchanger and a discrete heat exchange element are defined and computed using the continuous counterflow heat exchangers as a standard of comparison, and a method for optimizing the efficiency of such a chain is discussed.
TL;DR: In this article, a direct analog model of the basic types of heat exchangers is presented in the form of dimensionless temperature distribution curves, which simplify the heat exchanger calculations.
Patent•
12 Nov 1974
TL;DR: In this article, a compressor heat pump is provided with calibrated non-return valves to reverse the direction of flow of the fluid flowing in the heat pump for winter or summer operation.
Abstract: A heat exchanger containing two heat-exchange fluids flowing in countercurrent irrespective of the direction of heat exchange selected. In the specific case of a compressor heat pump, the exchangers 2 and 3 are provided with calibrated non-return valves 1A, 1B, 4A, 4B and 1C, 1D, 4C, 4D respectively to reverse the direction of flow of the fluid flowing in the heat pump for winter or summer operation. These valves automatically assume the required position when the four-way valve 5 of the compressor is actuated. Application to compressor heat pumps.
01 Jan 1974