【摘要】 针对于恒温恒湿系统的除霜最佳时刻的研究 ,本文提出了在户外温湿度恒定 ,室内温湿度变化状况下 ,当蒸发器表面上所结的霜的面积达到蒸发器总换热面积的 75 %时 ,利用此时的冷凝压力与蒸发压力的比值作为对机组除霜指令发出的基准。经实验的验证此方法还是可行的 ,能够运用于实际的工业恒温恒湿机组的最佳除霜时刻控制。更多还原

【Abstract】 The paper makes out a case that the optimal defrosting point of the constant temperature and humidity system under the constant outdoor temperature and humidity, variational indoor temperature and humidity situation. The ratio of the condensing pressure to the evaporating pressure, when the area of the frost covered the evaporator comes up to 75 per cent of the heat-exchanging area of the evaporator, is set as the standard of the system’s defrosting control. According to the ratio, heat exchanger can be defrosted at the optimal defrosting point, which can reduce the operating cost and avoid frequent switching the solenoid valve. And the defrosting control on the basis of the ratio is proved by the experiment.更多还原