Experimental study on refrigeration and dehumidification performance of capillary gravity circulation cabinets in summer

In order to determine the influence factors of cooling capacity and the dehumidification performance of the capillary gravity circulation cabinet (gravity cabinet), the Songjiang area of Shanghai is selected as a representative high-humidity area to build a test platform of the gravity cabinet. The effects of indoor load, water supply temperature, water supply flow rate and radiation plate insulation on the refrigeration and dehumidification performance of gravity cabinet and indoor temperature and humidity are studied through the experimental test, and the cooling capacity fitting formula in summer is obtained. The test results show that the refrigeration and dehumidification performance of the gravity cabinet can better meet the requirements of the room in summer. When the room load is 1 300 W, the total cooling capacity of the gravity cabinet is 1 400-2 100 W without insulation and 1 500-2 300 W with insulation. When the room load is 1 500 W, the cooling capacity increases to 1 600-2 300 W without insulation and 1 750-2 600 W with insulation. The cooling capacity will be enhanced with the decrease of water supply temperature, the increase of water supply flow rate and room load, and the addition of thermal insulation to external radiant panels. The radiation cooling capacity of the gravity cabinet accounts for a small proportion, which is 3.0%-4.5% without insulation and reduces to 0.5%-1.0% with insulation. In summer, the indoor temperature range is 24-25 ℃, the relative humidity range is 45%-50%, and the dehumidification performance of the gravity cabinet ranges from 400 to 1 000 g/h under normal working conditions.