| Solar powered absorption system drive the absorption system for cooling and heating by using the heat obtained by solar energy collector. The application of solar power, which is a renewable energy resource, can reduce building energy conservation and carbon emissions. The performance improvement and economic applicability of solar powerd absorption system creates conditions for its development. In this paper, a combined operation system of solar powered double effect LiBr-H2O absorption geothermal heat pump and compression chiller was developed. The energy consumption of this system was simulated based on the experimental research of Parabolic Trough Collector (PTC) and double effect LiBr-H2O absorption geothermal heat pump. The energy saving and efficiency was also analyzed. The research contents and conclusions are as follows:Firstly, the PTC performance was researched and analyzed by using available experimental data. The efficiency of PTC changes with thermal oil temperature and solar radiation intensity were obtained. The results revealed that heat collection efficiency and thermal oil outlet temperature of PTC increased while the solar radiation intensity increasing, and the optical efficiency and heat loss coefficient of PTC were 0.5895 and 0.1661, respectively. In the second place, the COP under cooling and heating conditions of double effect LiBr-H2O absorption system were obtained in different chilled water and hot water inlet temperature conditions by using available experimental data. The results revealed that the maximum COP under cooling and heating condition was 1.23 and 2.23, respectively. A TRNS YS model of solar powered double effect absorption geothermal heat pump system was established, and the mathematical model of each part of the module were developed and analyzed. The model was simulated and validated by applying the experimental performance data. The maximum relative error between the experimental results and the simulation values was 4.71%.The overall performance of solar powered double effect absorption geothermal heat pump system was simulated by using the TRNSYS simulation model. The results showed that the optimum overall COP was obtained when the heat source temperature reached 180?, and the value was 0.6625. A combined operation system model of solar powered double effect LiBr-H2O absorption geothermal heat pump and compression chiller was established basing on analysis. The model was used to simulate the summer and yearly operation condition in Shanghai, Guangzhou, Beijing, and Xi'an. he performance of energy saving and efficiency were analyzed by comparing with compression chiller and gas boiler system.Under the operation condition in summer, the lowest annual cost under 15 years operation period would be achieved by setting the load of solar powered absorption chiller as 10%, PTC aperture area as 800W/m2 and the unit price was less than ?500/m2. The ratio between combined operation system and compression chiller and gas boiler system in Shanghai, Guangzhou, Beijing, Xian were 0.915?0.926?0.997?0.974, respectively. The payback periods of the combined operation system were 6.5,6.6,13,11.5 years, respectively. It was also noticed that the bigger solar powered absorption chiller loads ratio was, the more economical combined operation system would be.Under the yearly operation condition, the lowest annual cost under 15 years operation period ratio in Beijing and Xi'an would be achieved by setting the load of solar powered absorption chiller as 15% and PTC aperture area as 600W/m2. The ratio between combined operation system and compression chiller and gas boiler were 0.426 and 0.491, respectively. The payback periods of the combined operation system were 3.3 years and 4.1 years, respectively. But the lowest cost in Shanghai would be achieved by setting the load of solar powered absorption chiller as 10% and PTC aperture area as 600W/m2. The ratio was 0.801, and the payback period of the combined operation system was 7.5 years. In Shanghai, the annual cost ratio of the combined operation system would be the lowest while solar powered absorption chiller undertook 20% load and PTC unit price was less than (?)800/m2. In Beijing and Xian, the annual cost ratio of the combined operation system would be the lowest while solar powered absorption chiller undertook 15% load.In this paper, the performance of the solar powered double effect LiBr-H2O absorption geothermal heat pump system was investigated, the energy saving efficiency and economy was analyzed through the energy consumption simulation. This paper provided reference for application and promotion of the combined system. |
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