2022 Volume 39 Issue 1 Pages 43-
For the low-temperature waste heat utilization, we have developed a “middle-low temperature absorption chiller” that provides 1 to 3 °C chilled water to promote waste heat utilization. This chiller has almost the same structure as a present single-stage absorption chiller and uses LiBr/H2O as its working pair. A small amount of absorbent (LiBr) is mixed in the evaporator to prevent the refrigerant from freezing. In this paper, we developed a production prototype as the practical use stage and verified the performance and behavior under the conditions of a 1 to 3 °C chilled water outlet. As a result of the experiments, the coefficient of performance (COP) was 0.71~0.73 by supplying 90 °C heat source hot water and 28 °C cooling water. The prototype operated successfully during the experiments without any problems such as refrigerant freezing or solution crystallization. We also computed the characteristics of the prototype using the cycle simulator with the same condition as the experiment. The simulation results agreed with the experimental results within ±5% for the cooling capacity and heat input and ±0.005 for the COP. Based on these results, we have put the “middle-low temperature absorption chiller” in practical use.
