基于氨水吸收循环远距离输送低品位热能性能研究

STUDY ON LOW-GRADE HEAT TRANSPORTATION OVER LONG DISTANCE BY AMMONIA-WATER ABSORPTION CYCLE

采用氨水吸收循环,将热源端低品位热能转变为化学能储存于氨水溶液浓度差中,可在环境温度下远距离输送氨水液体至用户端,实现吸收制冷或放热。建立系统数学模型和实验样机,模拟研究表明发生温度为110℃时,远距离制冷热力效率为0.5,制热热力效率为0.6;当输送距离为50km时制冷或制热电力效率均可达到50以上;通过实验样机验证了此理论的可行性,制冷实验热力效率相比理论值平均偏差21%,制热实验热力效率偏差17%,用户端输出温度能够满足夏季空调或冬季供暖需求。

Low-grade heat released by industrial area which is far away from city is hard to utilize due to heat losses. An ammonia-water absorption cycle was suggested to realize this target, in which thermal energy is transferred into chemical energy in source site by the change of solution concentration. There are no heat insulation requirements for the transportation pipelines. In user site heating or cooling could be released. Both mathematical model and experimental prototype has been built and analyzed. The simulation results showed that thermal COP as high as 0.5 or 0.6 can he reached to produce cooling or heating when generation temperature is about 110℃. Electrical COP is above 50 in which the transportation distance is 50km. The experimental prototype is used to testify the theory. The experimental results show 21% and 17% diversities with the theoretical cooling or heating results. The temperatures of cooling and heating obtained could satisfy the air conditioning in summer and heating in winter.