Optimization and economic analysis of heating scheme of a gymnasium

To determine the optimal heating method for gymnasiums, this study focuses on a specific gymnasium. The heat load of the gymnasium is analyzed by importing the meteorological data of Xi’an, and energy consumption simulation models for four heating systems are developed using the TRNSYS simulation software. The economic evaluation of these systems is conducted using the annual cost value method, and the optimal solar collector area is proposed. Additionally, the study examines the impact of different electricity prices on the annual cost value of the heating systems, as well as the optimal heating system configuration and its effect on the annual cost value under varying electricity prices. The main conclusions are as follows: (1) The density of people in the competition hall is much higher than that in the practice area, and the competition hall is located in the inner area with no external heat transfer protection structure, only the roof is used for heat exchange. The heat load in the competition hall (14.43 W/m2) is lower than that in the practice area (81.41 W/m2); (2) Through the economic analysis of two solar composite heating systems with different heat collection areas. The optimal heat collection area of the solar coupled electric boiler system and the solar coupled air source heat pump are 3024 and 2394 m2, respectively, and the minimum annual cost are 1,132,300 and 699,200 CNY, respectively; and (3) An economic analysis is conducted on the four heating systems at different electricity prices. When the electricity price is between 0.5 and 1.0 CNY/kWh, the air-source heat pump coupled with electric boiler system has the lowest annual cost value. However, when the electricity price is between 1.1 and 1.5 CNY/kWh, the solar energy coupled with air-source heat pump system has the lowest annual cost value.