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    • 2. 发明授权
    • Control system for refrigeration apparatus
    • 制冷设备控制系统
    • US4102150A
    • 1978-07-25
    • US737233
    • 1976-11-01
    • Kenneth John Kountz
    • Kenneth John Kountz
    • B60H1/00B60H1/32F24F11/02F25B1/00F25B49/02G05D23/24F25B49/00
    • B60H1/3211F25B49/02G05D23/1913G05D23/24B60H2001/3263B60H2001/3275
    • A controlled space is maintained at a desired set point temperature by adjusting the refrigerant temperature at the evaporator outlet in a refrigeration system, thereby controlling the evaporator effectiveness or capacity which is inversely proportional to the outlet temperature. When the space temperature tends to vary from the desired set point due to a changing heat load, the control system automatically changes the refrigerant flow through the evaporator to establish the evaporator outlet temperature at the control point required to maintain the controlled space at the desired temperature. More specifically, in response to a space temperature increase, the flow rate of the refrigerant increases; and in response to a drop below the set point, the refrigerant flow decreases. Such control of the flow rate is achieved by varying the displacement of a controlled displacement compressor included in the refrigeration system. When the heat load on the evaporator is constant, the refrigerant flow is controlled in order to hold the evaporator outlet temperature fixed at the required control point.
    • 通过调节制冷系统中的蒸发器出口处的制冷剂温度,将受控空间维持在所需设定点温度,从而控制与出口温度成反比的蒸发器有效性或容量。 当空间温度由于热负荷变化而趋向于从期望的设定点变化时,控制系统自动地改变通过蒸发器的制冷剂流量,以便在将受控空间维持在所需温度所需的控制点处建立蒸发器出口温度 。 更具体地,响应于空间温度升高,制冷剂的流量增加; 并且响应于低于设定点的下降,制冷剂流量减少。 通过改变包括在制冷系统中的受控排量压缩机的排量来实现流量的这种控制。 当蒸发器上的热负荷恒定时,控制制冷剂流量,以将蒸发器出口温度固定在所需控制点。