Research On Dehumidifying By HRV Based On Humidity Model In Solar-greenhouse

The solar greenhouse is the unique greenhouse structural style in the world. The humidity is one of important environmental factors in it. In winter, the relative humidity in the solar greenhouse is very high, because the greenhouse is closed very well for the heat preservation, and the high humidity environment is harmful to the crops. A model for forecasting the effect of dehumidifying by HRV is established in this paper, basing on lots of researches on humidity. The model describes the concreting of the steam, the transpiration of the crops, the evaporating of the soil, the physical exchange and so on;Three HRV were used to dehumidifying to test the model, and a experiential expressions about the effect of dehumidifying by HRV is concluded at last.It is tested that, when the HRV run lasting for one hour, the reduction of the relative humidity is approximately 4%;the reduction is approximately 7%, when lasting for 2 hours. Although the effect of dehumidifying is not so good, it can reduce the water on the leaves of the crops, and prevent diseases from the crops.The model and the test indicating that, the domestic evaporation (it mainly refers to transpiration of the crops, because of plastic covering the soil) and the small k are the main reasons why the effect of the dehumidifying is not so good.The balance point of the profit and loss is 1.2 Yuan/m~2·year, using HRV for dehumidifying.A experiential expressions about the effect of dehumidifying by HRV is concluded by the model at last.