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    • 3. 发明授权
    • Centrifugal compressor controller for minimizing power consumption while
avoiding surge
    • 离心式压缩机控制器,用于在消除浪涌的同时最大限度地降低功耗
    • US4686834A
    • 1987-08-18
    • US872314
    • 1986-06-09
    • Paul F. HaleyBrian S. JunkMerle A. RenaudPaul C. Rentmeester
    • Paul F. HaleyBrian S. JunkMerle A. RenaudPaul C. Rentmeester
    • F04D27/02F25B1/053F25B49/02F25B41/00
    • F04D27/0261F04D27/02F04D27/0246F04D27/0284F25B1/053F25B49/022F25B2600/021Y02B30/741
    • This controller is used for controlling a centrifugal compressor along its path of minimum power consumption while avoiding a surge condition. It is especially useful in a refrigeration system having a variable speed centrifugal compressor with adjustable inlet guide vanes. In such an application, the controller opens the inlet guide vanes enough to satisfy the cooling demand and then, to minimize power consumption, reduces the speed of the compressor while further opening the vanes (compensating for the reduced speed) until either the inlet guide vanes are fully open or an impending surge condition is detected. The onset of a surge condition is detected by monitoring motor current fluctuations. When fluctuations above a predetermined amplitude occur in excess of a predetermined frequency, the controller determines that a surge is impending. The controller continues to control the compressor in this manner, providing a capacity that is minimally above a level that would cause a surge yet is sufficient to satisfy the cooling demand.
    • 该控制器用于沿其最小功耗的路径控制离心式压缩机,同时避免浪涌状况。 特别适用于具有可调进口导向叶片的变速离心式压缩机的制冷系统。 在这种应用中,控制器打开入口导流叶片以满足冷却需求,然后为了最小化功率消耗,在进一步打开叶片(补偿降低的速度)的同时降低压缩机的速度,直到入口导向叶片 完全打开或者即将发生喘振状态。 通过监测电机电流波动来检测浪涌状态的开始。 当超过预定频率的波动超过预定频率时,控制器确定浪涌即将到来。 控制器以这种方式继续控制压缩机,提供最小程度高于会导致浪涌但足以满足冷却需求的能力的容量。
    • 5. 发明授权
    • Control and method for modulating the capacity of a temperature
conditioning system
    • 用于调节温度调节系统容量的控制和方法
    • US4689967A
    • 1987-09-01
    • US800426
    • 1985-11-21
    • Doyoung HanMerle A. Renaud
    • Doyoung HanMerle A. Renaud
    • F25B49/02G05D23/19F25D17/02
    • G05D23/1912F25B49/022G05D23/1917
    • A control and method for varying the capacity of a centrifugal chiller system used to cool a liquid to a setpoint temperature. The control permits the user to select the setpoint, the control gain, and two variables that determine a first deadband and a second relatively wider deadband about the setpoint. If the absolute value of the difference (error) between the actual fluid temperature and the setpoint is increasing, the control uses the first deadband, and conversely, if the error is decreasing, it uses the second deadband to vary chiller capacity. The control also permits the user to select a limit for various operating parameters associated with protective shutdown of the system to avoid catastrophic failure, and adjusts the chiller capacity according to one of two predefined functions of the deviation of the operating parameter from its limit, dependent on whether that deviation is greater or less than a predefined deadband.
    • 用于改变用于将液体冷却到设定点温度的离心冷却器系统的容量的控制和方法。 该控制允许用户选择设定点,控制增益以及确定关于设定点的第一死区和第二相对更宽的死区的两个变量。 如果实际流体温度和设定点之间的差值(误差)的绝对值增加,则控制器使用第一个死区,相反,如果误差在下降,则使用第二死区来改变冷却器容量。 该控制还允许用户选择与系统的保护性关闭相关联的各种操作参数的限制,以避免灾难性故障,并且根据操作参数的偏差与其极限相关的两个预定义功能之一来调节冷却器容量 关于该偏差是大于还是小于预定义的死区。
    • 6. 发明授权
    • Heat pump system selectively operable in a cascade mode and method of
operation
    • 热泵系统可选择性地以级联模式操作和操作方法
    • US4149389A
    • 1979-04-17
    • US883604
    • 1978-03-06
    • Floyd C. HayesMerle A. RenaudPaul R. Glamm
    • Floyd C. HayesMerle A. RenaudPaul R. Glamm
    • F25B7/00F25B13/00
    • F25B7/00F25B13/00F25B2313/0292F25B2700/2104F25B2700/2106
    • A system is disclosed for the transfer of heat from an ambient heat sink of variable temperature to a conditioned space, said system being operable in a first mode when the temperature of the heat sink is at a relatively high level, and in a second mode when its temperature is at a relatively low level. The system includes a first refrigerant circuit which is operable in said first mode as a heat pump of the vapor compression type to absorb heat from the ambient heat sink and transfer same to the conditioned space. A second refrigerant circuit is provided which is operable in the second mode, when the temperature of the ambient heat sink is at a relatively low level, to absorb heat from the ambient heat sink and transfer same to the first refrigerant circuit, which then transfers the heat to the conditioned space. Thus, in second mode operation, the first and second refrigerant circuits operate in a "cascade" relationship. Suitable control means are disclosed for effecting operation of the system as described above, and, in addition, a suitable method of operation for such a system is disclosed.
    • 公开了一种用于将热量从可变温度的环境散热器传递到调节空间的系统,当散热器的温度处于相对较高的水平时,所述系统可以以第一模式操作,并且在第二模式中, 其温度处于相对较低的水平。 该系统包括第一制冷剂回路,其可以在所述第一模式中作为蒸气压缩式的热泵来吸收来自环境散热器的热并将其转移到调节空间。 提供第二制冷剂回路,其可在第二模式中操作,当环境散热器的温度处于较低水平时,吸收来自环境散热器的热量并将其传送到第一制冷剂回路, 加热到空调空间。 因此,在第二模式操作中,第一和第二制冷剂回路以“级联”关系操作。 公开了合适的控制装置,用于实现如上所述的系统的操作,并且还公开了用于这种系统的合适的操作方法。
    • 8. 发明授权
    • Control and method for modulating the capacity of a temperature
conditioning system
    • 用于调节温度调节系统容量的控制和方法
    • US4715190A
    • 1987-12-29
    • US13110
    • 1987-02-10
    • Doyoung HanMerle A. Renaud
    • Doyoung HanMerle A. Renaud
    • F25B49/02G05D23/19F25D17/02F25B1/00
    • F25B49/022G05D23/1912G05D23/1917
    • A control and method for varying the capacity of a centrifugal chiller system used to cool a liquid to a setpoint temperature. The control permits the user to select the setpoint, the control gain, and two variables that determine a first deadband and a second relatively wider deadband about the setpoint. If the absolute value of the difference (error) between the actual fluid temperature and the septoint is increasing, the control uses the first deadband, and conversely, if the error is decreasing, it uses the second deadband to vary chiller capacity. The control also permits the user to select a limit for various operating parameters associated with protective shutdown of the system to avoid catastrophic failure, and adjusts the chiller capacity according to one of two predefined functions of the deviation of the operating parameter from its limit, dependent on whether that deviation is greater or less than a predefined deadband.
    • 用于改变用于将液体冷却到设定点温度的离心冷却器系统的容量的控制和方法。 该控制允许用户选择设定点,控制增益以及确定关于设定点的第一死区和第二相对更宽的死区的两个变量。 如果实际流体温度和分辨率之间的差异(误差)的绝对值在增加,则控制器使用第一死区,相反,如果误差减小,则使用第二死区来改变冷却器容量。 该控制还允许用户选择与系统的保护性关闭相关联的各种操作参数的限制,以避免灾难性故障,并且根据操作参数的偏差与其极限相关的两个预定义功能之一来调节冷却器容量 关于该偏差是大于还是小于预定义的死区。