Experimental Study of the Heat Flow and Energy Consumption during Liquid Cooling Due to Radiative Heat Transfer in Winter

Radiation cooling is a passive energy saving technology. The process of heat transfer liquid due to the combined effect night radiative and convection air at negative temperatures (in winter) studied. radiator used for was built into roof building. Its radiating plate made steel sheet coated with zinc oxide. In it, dissipation carried out both from upper lower sides plate. experimental values flux ranged 20 80 W·m−2 temperature difference between 5 15 °C ambient −17 +5 °C. correctness model calculating in winter conditions confirmed. A theoretical calculation showed that, winter, removed by will be 15% less than summer. amount transferred per watt electrical power refrigeration unit reached 8 W·W−1. To keep more efficient conventional vapor compression chiller, should 6 above atmospheric air. results study show that can may useful development energy-efficient systems various purposes (air conditioning, industrial fruit storage chambers).