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    • 9. 发明授权
    • Defrost mode for HVAC heat pump systems
    • HVAC热泵系统的除霜模式
    • US07707842B2
    • 2010-05-04
    • US11744339
    • 2007-05-04
    • Julio ConchaYu ChenYoung Kyu ParkTobias H. Sienel
    • Julio ConchaYu ChenYoung Kyu ParkTobias H. Sienel
    • F25D21/06
    • F25B30/02F25B47/022F25B2339/047F25B2400/0403F25B2500/18F25B2500/19F25B2700/133F25B2700/2106F25B2700/21151
    • A heat pump, and in particular a heat pump for heating a hot water supply is provided with an improved defrost mode. The defrost mode is actuated to remove frost from an outdoor evaporator that may accumulate during cold weather operation. An algorithm for operation of the defrost mode is developed experimentally by seeking to maximize the heat transfer provided by the refrigerant. A heating system condition is experimentally related to the heat transfer capacity. One then maximizes the average heat transfer capacity to determine the optimum initiation point for the defrost mode. Further, protections are included into the defrost mode. When the heat pump is utilized to heat hot water, methods are provided to prevent the water that remains in the heat exchanger from becoming unduly heated. In one method, the water pump may be periodically operated to move the water. In a second method, a control ensures the discharge pressure of the refrigerant leaving the compressor is reduced, and that the water pump is not stopped until that reduced temperature falls below a predetermined maximum. The temperature reduction is achieved through a dual control loop wherein a temperature that is too high results in a new desired discharge pressure. The control achieves the new desired pressure by controlling the expansion device. In another protection feature, as a control determines that the defrost mode is nearing its end, an evaporator fan is run to remove melted water from the evaporator coils, and also to ensure the refrigerant leaving the evaporator does not reach unduly high pressure or temperatures.
    • 具有改进的除霜模式的热泵,特别是用于加热热水源的热泵。 启动除霜模式以从室外蒸发器中除霜,这可能会在寒冷天气下运行时积聚。 通过试图使制冷剂提供的热传递最大化,实验地开发了除霜模式的操作算法。 加热系统条件实验上与传热能力有关。 然后将平均传热能力最大化,以确定除霜模式的最佳起始点。 此外,保护被包括在除霜模式中。 当使用热泵来加热热水时,提供了防止热交换器中残留的水变得过度加热的方法。 在一种方法中,水泵可以周期性地操作以移动水。 在第二种方法中,控制器确保离开压缩机的制冷剂的排放压力降低,并且水泵不停止,直到降低的温度降到预定的最大值以下。 通过双重控制回路实现温度降低,其中太高的温度导致新的期望排出压力。 该控制通过控制膨胀装置实现新的期望压力。 在另一个保护特征中,当控制器确定除霜模式接近其结束时,运行蒸发器风扇以从蒸发器盘管去除熔化的水,并且还确保离开蒸发器的制冷剂不会达到过高的压力或温度。