北方日光温室的冬季除湿技术

针对冬季北方日光温室高湿的特点,采用高性能除湿机对日光温室进行除湿。试验主要包括2个阶段:第1阶段采集日光温室热环境参数,找到日光温室内部温度和相对湿度(RH)参数的时间分布规律;第2阶段采用除湿机进行除湿试验,分别选取相对湿度70%和60%2种不同的设定湿度,对除湿机的除湿能力进行评定,最后衡量冬季除湿机除湿的经济盈亏点。结果表明:当除湿机设定RH为70%时,在5 h的工作期间内除湿机工作了1.12 h,日光温室内RH均值为63.01%,比不使用除湿机RH降低5.06%。冬季收入盈亏点为2.287元/m2。当除湿机设定RH为60%时,除湿机工作2.02 h,可以将RH均值维持在55.10%,比不使用除湿机RH降低12.97%。过冬收入盈亏点为2.637元/m2。在无法使用通风除湿的情况下,可以采用除湿机对日光温室进行除湿,控制日光温室RH过高的情况。

Dehumidification Technology of Solar Greenhouse in Winter of the Northern Area

According to high humidity characteristic of solar greenhouse in northern winter, high-performance dehumidifier should be used in solar greenhouse. The experiment mainly includes two phases. The first phase is to collect environmental parameters in the solar greenhouse to find temper-ature and time distribution of relative humidity inside the greenhouse. The second phase is to use de-humidifier in the experiment to assess effects of the dehumidifier under the set humidity of 70% and 60%, and finally measure the benefits and cost by using dehumidifier in winter time. The experi-mental results show that when humidity is set on 70%, the dehumidifier humidifies for 1. 12 h during 5 h, and the mean relative humidity is 63. 01%, which is reduced by 5. 06% compared with that when dehumidifier is not used. The winter income break-even point is 2. 287 yuan/m2 . When humid-ity is set on 60%, the dehumidifier works for 2. 02 h, and the mean relative humidity maintains at the level of 55. 10%, which is reduced by 12. 97% compared with that when dehumidifier is not used. The income break-even point over the winter is 2. 637 yuan/m2 . When ventilation and dehu-midification conditions are not accessible, we can use dehumidifier to prevent RH of solar green-house from being too high.