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为了明确土壤新风系统在日光温室中应用的可行性,设置了不同风速(5.8、4.6、3.1m·s~(-1))条件,以监测土壤新风系统进出口空气温湿度及不同管道长度的气流温度,并计算了系统的热特性。结果表明:日光温室内部≥50cm深土壤的温度比较恒定,日变化幅度≤0.3℃。在5.8、4.6、3.1m·s~(-1)的流速下,新风经过系统温度分别提高了7.8~8.9、9.8~11.9、6.3~7.8℃;出口空气湿度分别为42.3%~52.0%、35.4%~40.3%、61.6%~83.6%;进出口焓差分别为7.7~9.4、9.9~12.1、9.3~12.5kJ·kg~(-1);运行时段内吸收土壤的热量分别为23 160、23 492、14 884kJ。土壤新风系统可以显著提升新风温度,出口处新风湿度低于室内空气湿度,具有良好的吸热能力,说明土壤新风系统可以用于冬季日光温室空气环境的调控。
In order to clarify the feasibility of soil fresh air system applied in solar greenhouse, different wind speed conditions (5.8, 4.6, 3.1m · s -1) were set to monitor the temperature and humidity of air inlet and outlet of soil fresh air system and the length of different pipelines Airflow temperature, and calculated the thermal characteristics of the system. The results showed that the temperature of ≥50cm depth soil in solar greenhouse was relatively constant, and the daily variation range was less than or equal to 0.3 ℃. Under the flow rates of 5.8, 4.6 and 3.1m · s -1, the fresh air temperature increased by 7.8 ~ 8.9, 9.8 ~ 11.9 and 6.3 ~ 7.8 ℃, respectively; the outlet air humidity were 42.3% ~ 52.0% and 35.4 % ~ 40.3% and 61.6% ~ 83.6%, respectively. The enthalpy difference between import and export was 7.7 ~ 9.4,9.9 ~ 12.1,9.3 ~ 12.5kJ · kg ~ (-1) respectively. The heat absorbed by the soil during operation was 23 160 and 23 492,14 884kJ. The soil fresh air system can significantly improve the fresh air temperature, the fresh air humidity at the outlet is lower than the indoor air humidity, and has a good ability of absorbing heat, indicating that the fresh air system of the soil can be used for controlling the air environment in a solar greenhouse in winter.