Design and Modelling of Water Chilling Production System by the Combined Effects of Evaporation and Night Sky Radiation

Abstract

The design and mathematical modelling of thermal radiator panel to be used primarily to measure night sky radiation wet coated surface is presented in this paper. The panel consists of an upper dry surface coated aluminium sheet laminated to an ethylene vinyl acetate foam backing block as an insulation. Water is sprayed onto the surface of the panel so that an evaporative cooling effect is gained in addition to the radiation effect; the surface of a panel then is wetted in order to study and measure the night sky radiation from the panel wet surface. In this case, the measuring water is circulated over the upper face of this panel during night time. Initial TRNSYS simulations for the performance of the system are presented and it is planned to use the panel as calibrated instruments for discriminating between the cooling effects of night sky radiation and evaporation.

Opportunities and prospects for the use of solar energy for refrigeration of public buildings

“…The temperature of the water chilled in this way is 3-4 ℃ lower than the temperature of the water chilled during the day, and the final water temperature is close to the saturation temperature of the outside air. Another advantage of night-time evaporative cooling, compared to daytime evaporative cooling, is the possibility of additional water cooling by using the effective radiation of the water surface to the night sky, the conditional temperature of which, determined according to [5][6][7][8] (Eq. 1 and 2).…”

“…In accordance with the principle calculation diagram in Figure 1, the differential equations (Eq. [3][4][5][6][7][8][9][10][11][12] for the heat balance of water flowing down the sloping plane is given. For simplicity, the friction forces between the air and the surface of the flowing water, and between the surfaces of the solid inclined plane on which the water flows and the surface of the flowing water are neglected [15][16][17][18][19][20].…”

“…The demand for energy efficient air conditioning systems to minimize the energy consumption worldwide has been an important issue for researchers since the invention of active air conditioning system. In parallel with the researchers conducted to create new conventional air conditioning technologies, researches to find noncompressor systems took a place [7,8]. The aim of the work is to develop the scientific and technical foundations of evaporative and solarevaporative devices for comfortable and technological air conditioning, the creation and production testing of an air conditioning system based on them and to summarize the experience of their operation.…”

Use of evaporative cooling units in solar air conditioning installations

“…during the day, and the final water temperature is close to the saturation temperature of the outside air. Another advantage of night-time evaporative cooling, compared to daytime evaporative cooling, is the possibility of additional water cooling by using the effective radiation of the water surface to the night sky, the conditional temperature of which, determined according to [3][4][5][6].…”