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Showing 1 to 7 of 7 for “"Microchannel Evaporator"”.
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Prediction and mitigation strategies for the transient thermal performance of low thermal resistance microchannel evaporators
Microchannel flow boiling heat transfer offers an effective thermal management solution for high heat flux microelectronic devices such as laser diodes. The high heat transfer rates, nearly isothermal flow conditions, high surface area-to-volume ratios, and lower required pumping powers facilitate …
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Two phase flow distribution in parallel flow heat exchangers -- experimentally verified model
… of refrigerant is a problem in parallel microchannel heat exchangers that lowers their potential effectiveness, especially when controlled by superheat. This paper describes modeling and numerical simulation of two phase mass flow distribution in a microchannel evaporator, on the basis of …
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Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… phase adiabatic flow in headers of parallel flow evaporators, of typically microchannel design. Three main issues that will be explored in this thesis are: 1) separation of vapor-liquid refrigerant immediately after an expansion device in a compact T-junction and design options to enhance its …
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Periodic reverse flow in microchannel evaporators
… scale heat removal applications, for instance, microchannel heat sinks for cooling of electronics. Due to the industry’s strict requirement for thermal stability, previous research on flow instabilities in microchannels has been largely focused on heat sinks for electronic cooling. There is a …
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Experimental and modeling study of lubricant effect on refrigerant distribution in microchannel evaporators
Microchannel heat exchanger has been used in industry for decades. But the problem of refrigerant maldistribution can significantly deteriorate the performance of heat exchanger (especially evaporator) and system. In real air conditioning systems especially automobile air conditioning systems where …
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Performance measurement and visualization on the refrigerant distribution in the vertical manifold of the microchannel tube heat exchanger
… intermediate vertical manifold in a multi-pass evaporator. A new test rig is designed and built to circulate R410A through the vertical microchannel manifold. Refrigerant is circulated into the manifold through the lower set of parallel microchannels and exits through the upper set. Three …
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Instability of flow boiling in parallel microchannels
… systems, including HVAC&R equipment. The compact microchannel design of a heat exchanger (MCHX) allows for significant reduction of its volume, weight, and raw material, in comparison to conventional fin-and-tube heat exchangers in HVAC&R systems. The current generation of microchannel evaporators …