小型太阳能驱动单效溴化锂吸收式制冷机组的模拟研究

Performance of solar-energy single-effect lithium bromide absorption refrigeration unit is numerically simulated. The solar collector simulation system is established by TRNSYS. The effects of solar radiation intensity and solar driving temperature on the refrigeration performance of the unit are analyzed. The EES programming is used to establish a small single- effect lithium bromide absorption refrigeration unit(12 kW)model. The dynamic numerical simulation is used to study the thermal performance and unit operating state under design conditions and variable operating conditions. The coupling research method is used to analyze the effects of driving heat source temperature,heat source flow,inlet and outlet temperature of refrigerant water,cooling water inlet temperature and other factors on the refrigeration performance of the unit. The research results show that the operating temperature range of the low temperature collector is better matched with the single-effect lithium bromide refrigerator,which not only avoids the waste of energy grade,but also avoids causing the driving heat source temperature too high,resulting in the crystallization of lithium bromide solution. The effective solar radiation intensity has a significant impact on the refrigeration performance of the unit. When the radiation intensity increases from 550 W/m² to 990 W/m²,the cooling capacity increases from 5.0 kW to 16 kW. According to the design parameters,the coefficient of performance of the small solar absorption chiller can reach 0.70.