Study on multi-objective decision-making operation strategy of heat supply tower

In northern China, the long-term operation of ground source heat pumps brings the problem of soil cold accumulation, which can be effectively solved by adopting the heat supply tower to recharge the ground in summer. In this paper, seven indexes affecting the performance of the heat supply tower, such as temperature difference between inlet and outlet water, heating approach, thermal efficiency, and exergy destruction, are studied experimentally, and the energy efficiency ratio of the heat supply tower is analyzed. Then, based on the experimental data, the decision of the operating conditions is made. The results show that it is impossible to judge the performance of the heat supply tower based on a single index, and multiple criteria need to be considered at the same time. The energy efficiency ratios of the heat supply tower range from 12.7 to 22.5 and the optimal operating conditions of the heat supply tower under the experimental conditions are derived based on the TOPSIS decision. This paper provides a theoretical basis for the performance analysis and operation condition study of the heat supply tower.