SUPERMARKET APPLICATION. EFFECTS OF SUB-COOLING ON REAL R744 BASED TRANS-CRITICAL PLANTS IN WARM AND HOT CLIMATE. DATA ANALYSIS

摘要

Several techniques are under development worldwide to expand the convenient use of Carbon Dioxidern(R744) in region with high external temperature. This paper analyses the effect of a sub-cooling device inrnreal R744 trans-critical plants for supermarket application. A sub-cooling device is a system able to assistrna gas cooler to cool a stream of trans-critical R744 before its expansion in the high pressure valve. Thernaim of the study is to understand how much the presence of a sub-cooler device helps the efficient use ofrnR744 for refrigeration in commercial application in the hot and warm temperature region. The use of thernsub-cooler reduces the discharging temperature and pressure peaks, as well as the power peaks and thernoverall energy consumption. This paper analyses a collection of data coming from different storesrnequipped with sub-cooling in order to compare them with stores without the sub-cooling device. Storesrnwith different sub-cooling techniques have been analyzed such as mechanical, groundwater andrnintegration with A/C.