Micro technology in heat pumping systems

Munkejord, Svend Tollak; Mæhlum, H.S.; Zakeri, Golbon; Nekså, Petter; Pettersen, Jostein

doi:10.1016/s0140-7007(00)00036-0

Cited by 25 publications

(8 citation statements)

References 6 publications

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“…7, the heat sink thermal resistances computed from Eqs. (6) and (7) as functions of coolant flow rate and microchannel geometry are shown. Both thermal resistances have the same trend of variation with the coolant flow rate.…”

Section: Heat Sink Thermal Resistance Estimationmentioning

confidence: 99%

“…The miniature vapor compression refrigerator principle is the same as that for a conventional sized refrigerator except that the size is reduced to the centi-or milli-meter order. Currently a miniature vapor compression refrigerator is under development using microelectromechanical system (MEMS) technologies [4][5][6]. The main difficulty is the micro-scale compressor design and fabrication [7].…”

Section: Introductionmentioning

confidence: 99%

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Performances of thermoelectric cooler integrated with microchannel heat sinks

Chein

Chen

2005

International Journal of Refrigeration

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Section: Heat Sink Thermal Resistance Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performances of thermoelectric cooler integrated with microchannel heat sinks

Chein

Chen

2005

International Journal of Refrigeration

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“…In addition, due to the development of MEMS such as micro heat pumps with dimensions in the order of centimeters, a number issues have yet to be solved. These including the determination of micro heat exchanger heat transfer capacities (Munkejord et al, 2002). In this aspect, it is necessary to understand the fundamental phenomena of two-phase flow and flow boiling in small and mini channels.…”

Section: Two-phase Flow and Flow Boiling Of Mixtures In Small And Minmentioning

confidence: 99%

“…With the rapid development of micro-electro-mechanical systems (MEMS), the development of compact and micro evaporators for mixture fluids is becoming essential. For example, potential development of micro heat pumps (Munkejord et al, 2002) using newly friendly refrigerant mixtures requires to understand two-phase flow and flow boiling phenomena of mixtures in small and mini channels. Other new technologies such as micro energy systems, micro chemical and bio-medical systems etc also require to understand the fundamental aspects of twophase flow and flow boiling of mixtures in small and mini channels.…”

Section: Introductionmentioning

confidence: 99%

Review of two-phase flow and flow boiling of mixtures in small and mini channels

Cheng

Mewes

2006

International Journal of Multiphase Flow

170

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“…Such minipumps are primarily topical for cooling microprocessors and minicomputers, as well as the electronic drive on transport [34][35][36][37][38]. The currently existing technology of producing chips in electronic devices can be useful for making heat-exchangers with minichannels made in silicon plates by the etching method [39].…”

Section: Thermodynamics and Heat And Mass Exchange In Sorption Heatmentioning

confidence: 99%

Prospects for employing heat pumps in the Republic of Belarus

Васильев

2005

J Eng Phys Thermophys

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ev UDC 621.577A brief analysis of the possibilities of employing sorption heat pumps in the Republic of Belarus is given. Primary consideration is given to the light-duty heat pumps used for air-conditioning systems with automatic switching from the heating to the cooling state (air/water). One important component of sorption heat pumps is the low-temperature power source, which strongly influences the design of the heat pump in terms of economy and environmental protection.The Republic of Belarus is situated in a geographical zone where the average summer temperature exceeds 20 o C and in winter it is close to 0 o C. Therefore, the application of heat pumps is economically sound mainly for heating, although in a certain period of the summertime they can also be used for air/water cooling. It is known that 90% of the global population need heat pumps for the purposes of heating and cooling. In the present paper, primary consideration is given to the light-duty heat pumps used for air-conditioning systems with automatic switching from the heating to the cooling state (air/water). In international practice, to achieve the above purpose, electrically operated steam compression heat pumps [1], in which, instead of the ecologically dangerous coolant R22, coolants R410A and R407C, as well as propane, propylene, ammonia, and CO 2 are used, are widely used. However, in the last few years, publications devoted to the development and implementation of sorption (absorption and adsorption) gas-operated (flame, gas burners) heat pumps have appeared. Unfortunately, quantity production of sorption heat pumps has been set up so far only in Japan and in the USA, while two or three years ago China began their quantity production as a part of air-conditioning systems for industrial enterprises (absorption heat pumps: heat-transfer material -lithium bromide/water) [2]. At present, of the 9 million heat pumps installed throughout the world, Europe has only 450 thousand, and they are used mainly on the basis of the gas-gas cycle for the purposes of heating in winter and cooling in summer. Of these, 135 thousand heat pumps operate in Central Europe only for air and water heating. The demands for heat pumps are satisfied mainly due to their importation from the USA and Japan. Therefore, national programs of production of heat pumps are welcomed and stimulated in every way. In Switzerland, 40% of new one-and two-family houses are equipped with heat pumps. A similar situation occurs in Austria. For private homes, of great interest are light-duty adsorption heat pumps (zeolites/water, silica gels+salts/water; active carbons/alcohol, etc.) [3][4][5][6]. One important component of sorption heat pumps is the low-temperature energy source, which strongly influences their design in terms of economy and environmental protection. Consequently, the design of a heat source depends in many respects on the chosen low-temperature energy source: atmospheric air, outflowing air of rooms (ventilation release), waters of rivers and lakes and ground waters...

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Micro technology in heat pumping systems

Cited by 25 publications

References 6 publications

Performances of thermoelectric cooler integrated with microchannel heat sinks

Performances of thermoelectric cooler integrated with microchannel heat sinks

Review of two-phase flow and flow boiling of mixtures in small and mini channels

Prospects for employing heat pumps in the Republic of Belarus

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