The Experimental Study of Shell and Tube Gas Coolerin Trans-critical Carbon Dioxide Heat Pump System

摘要

As one of the core device of the carbon dioxide heat pump system,the level of heat transfer coefficient of gas coolers has direct impact on the performance and efficiency of the heat pump system.By selecting different experimental conditions,the thesis makes experimental studies that how relevant parameters influence the coefficient of heat transfer on the shell and tube gas cooler when the system is running.Studies have shown that under the same pressure,with the increase of carbon dioxide and water flow,the average heat transfer coefficient of gas cooler also increases,but in the same state inlet temperatures of carbon dioxide almost have no affect on the average heat transfer coefficient and the maximum of heat transfer coefficient decreases gradually with the pressure increasing.