Abstract
The ground water-source heat pump system for the plant factory lacks a scientific operation strategy to solve the problem of high energy consumption in winter and summer. It is very difficult and uneconomical to change the operation conditions by experimental means to obtain actual operation data. The current study aims to build a TRNSYS simulation model of the ground water-source heat pump system of Shanghai Chongming Natural Light Plant Factory. For the heating season, the simulation of energy consumption was 2315 GJ. Compared with the actual energy consumption, the relative error is -0.98%, which indicates that the simulation results are accurate and the simulation model developed is appropriate and usable. Numerical simulations for the whole year on this basis yielded that the plant factory energy supply system operates from November to March with a heating energy consumption of 3530.84 GJ and from June to September with a cooling energy consumption of 1126.24 GJ. In most cases, the indoor temperature fluctuates within a reasonable range, but in the summer high-temperature season, the plant factory temperature will reach above 40℃, which seriously affects plant growth. After optimization, the plant factory stops production in July and August, and the system stops running, the results are that the optimized system can save 56% of the annual cooling energy consumption, totalling 767.48 GJ, which can reduce the costs by 160,318.05 RMB.
Highlights
The ground water-source heat pump system is highly efficient and environmentally friendly [1]
The results show that hybrid ground source heat pump systems with solar collectors are significantly more energy-efficient in predominantly heating areas
The TRNSYS model can be used for yearround energy consumption simulation
Summary
The ground water-source heat pump system is highly efficient and environmentally friendly [1]. Research on the application of ground water-source heat pump technology in the plant factory sector is relatively extensive, focusing on system design [2,3], system performance [4], technical and economic feasibility [5], operational effectiveness [6], and thermodynamic analysis [7]. Since it is time-consuming and expensive to change the operating conditions by experimental means, some scholars have tried to use numerical calculation methods and TRNSYS software to carry out simulation studies [8]. This paper is based on the study of the Chongming natural light plant factory to simulate the energy consumption of ground water-source heat pump system by TRNSYS software for a typical year throughout the year and optimize the operation strategy
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