Topic
Subcooling
About: Subcooling is a research topic. Over the lifetime, 6150 publications have been published within this topic receiving 99125 citations.
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01 Jan 1990
TL;DR: In this article, a model was developed to determine the least-cost cooling strategy for a building by using the building mass for thermal storage, which is achieved by subcooling the mass immediately before the peak utility rate period, thereby shifting a portion of the cooling load off-peak.
Abstract: A model has been developed to determine the least-cost cooling strategy for a building by using the building mass for thermal storage. The savings is achieved by subcooling the mass immediately before the peak utility rate period, thereby shifting a portion of the cooling load off-peak. The method described formulates an objective function based on the energy consumption of a simple building model. The building is subject to thermal loads from solar and ambient temperature influences., Daily energy use is broken up into three phases: coast-up, maintenance, and subcooling, which are multiplied by an appropriate energy cost to find the total daily cooling cost. The cooling cost is then optimized with respect to an appropriate independent variable. Analytical results using the characteristics of a light commercial structure have shown cooling cost savings of 18% when compared to base case simulations.
35 citations
TL;DR: In this article, the significant effects of imposed wall heat flux oscillation on bubble characteristics of subcooled flow boiling with R-134a in horizontal annular ducts are experimentally performed in details.
35 citations
TL;DR: In this article, the authors proposed to flood the compressor with a large quantity of oil to achieve a quasi-isothermal compression process, in addition to using a regenerator to increase refrigerant subcooling.
Abstract: Vapor compression refrigeration technology has seen great improvement over the last several decades in terms of cycle efficiency through a concerted effort of manufacturers, regulators, and research engineers. As the standard vapor compression systems approach practical limits, cycle modifications should be investigated to increase system efficiency and capacity. One possible means of increasing cycle efficiency is to flood the compressor with a large quantity of oil to achieve a quasi-isothermal compression process, in addition to using a regenerator to increase refrigerant subcooling. In theory, compressor flooding and regeneration can provide a significant increase in system efficiency over the standard vapor compression system. The effectiveness of compressor flooding and regeneration increases as the temperature lift of the system increases. Therefore, this technology is particularly well suited towards lower evaporating temperatures and high ambient temperatures as seen in supermarket refrigeration applications. While predicted increases in cycle efficiency are over 40% for supermarket refrigeration applications, this technology is still very beneficial for typical air-conditioning applications, for which improvements in cycle efficiency greater than 5% are predicted. It has to be noted though that the beneficial effects of compressor flooding can only be realized if a regenerator is used to exchange heat between the refrigerant vapor exiting the evaporator and the liquid exiting the condenser.
35 citations
TL;DR: In this paper, the impacts of roughness and inhibitor concentration on the freezing temperature, subcooling and the heterogeneous nucleation energy at the surface of aluminum, copper and Teflon plates were studied.
35 citations
TL;DR: In this paper, some closure correlations of the bubble departure diameter, active site density and bubble waiting time were tested in the frame of the two-fluid model and the CFX code.
35 citations