Study on the effect of different types and distribution ratio of heat users on operation performance of the distributed solar centralized heating system

Abstract

The distributed solar centralized heating system (DSCHS) is formed by connecting the dispersed solar heating users through the heat pipe network. This system is designed based on research into the effect of various types of distribution ratios of heat users on the overall operating performance of the heating system. Based on the energy balance process analysis of the distributed solar heating system, the mathematical model of thermodynamic analysis is established. Three performance evaluation indexes of solar fraction, available heat collection coefficient, and cluster effect coefficient are proposed to quantitatively analyze the cluster heating characteristics of different types of heat users. The thermal profit and loss characteristics of various types of heat users are obtained by numerical simulation, and the influence of user types and distribution ratio on system performance is quantitatively analyzed. The results indicate that when a system has the surplus, self-satisfaction, and unsatisfied users concurrently, the system's performance parameters are optimum. Especially the cluster effect coefficient increases by 55.2% compared with the system with only one type of user. The cluster effect coefficient of the three types of users with uniform distribution is 8.9% − 21.3% higher than that of the extreme distribution. Meanwhile the system's solar fraction and available heat collection coefficient remain elevated, indicating that the advantage of user cluster heating is obvious.