| 摘要 |
[Objectives] To improve the thermal insulation performance of solar greenhouses in winter, enhance solar energy utilization efficiency, reduce additional carbon emissions, and lower winter heating costs for greenhouses. [Methods] An active heat storage and release water bag was added inside the solar greenhouse. Comparative experiments were conducted between the experimental greenhouse K1 equipped with the heat storage water bag and the control greenhouse K2 under different winter night weather conditions. [Results] On sunny days, the maximum temperature difference between K1 and K2 was 2.3 ℃, and the average temperature during the water bag’s heat release period increased by 2.2 ℃; on cloudy days, the maximum temperature difference was 2.2 ℃, and the average temperature increased by 2.0 ℃; on snowy days, the maximum temperature difference was 1.8 ℃, and the average temperature increased by 1.6 ℃. Additionally, the heat storage capacities of the water bag on sunny, cloudy, and snowy days were 491.4, 453.6, and 365.4 MJ, respectively. The corresponding nighttime heat release amounts were 378, 302.4, and 226.8 MJ, respectively. The corresponding heat storage-release efficiencies were 76%, 66.2%, and 62%, respectively. The service life of the heat storage water bag can reach 10 years, with an annual operating cost of approximately 2 500 yuan. [Conclusions] By comprehensively analyzing the initial costs, operating expenses, and cost savings rate compared to coal burning for current main energy-saving heat storage and warming equipment in solar greenhouses, this study provides reference suggestions for the promotion, application, and selection of winter heat storage and warming equipment for solar greenhouses in different regions. Users can choose to install the equipment based on the performance characteristics of the heat storage water bag and their actual needs. |
