The increasing heat generation rates in VLSI circuits motivate research on compact cooling technologies with low thermal resistance. This paper develops a closed-loop two-phase microchannel cooling system using electroosmotic pumping for the working fluid. The design, fabrication, and open-loop performance of the heat exchanger and pump are summarized. The silicon heat exchanger, which attaches...

JSC Heat Pump Development StatusMichael K. Ewert/ (281)483-9134/ [email protected] Heat pumps can be used in warm thermal environments to raise the temperature of wasteheat to a level that makes it more efficient to reject to space through thermal radiatorpanels. This reduction in radiator panel volume and mass comes at the expense of poweruse. However, in many c...

A heat pump uses natural energy from renewable sources such as air, ground or water. The pump, acquiring thermal the environment (75%) and using electricity (25%), supplies it to heated object. pump-based system consists of a source (heat is taken it), unit an upper transferred it). refrigerant transfers lower source. paper discusses types pumps in terms use technical economic analysis was carr...

This paper presents the benefits in capacity and performance of a hybrid control of expansion valves for two 5-ton (17.6 kW) domestic heat pumps (HPs) based on experimental results. The hybrid control, as proposed by Kim et al. (2008a), employs a primary expansion valve that provides most of the pressure drop, while small secondary/balancing valves in the distributor lines to the circuits of th...

In low-heating-energy buildings heat pumps have become an attractive heating system due to a notable reduction of the space heating requirements and the introduction of low temperature heating systems. Comfort cooling becomes also more important, especially in lightweight buildings with large south-oriented windows, which partially tend to overheat in summer. A heat pump has the unique feature ...