System for monitoring the operation of a compressor unit
First Claim
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1. A system for monitoring the electrical current drawn by a drive motor for a compressor unit of a chiller that includes an evaporator unit with a heat exchange medium passing therethrough, said system comprising:
- an electrical current sensor for sensing the electrical current drawn by the drive motor for the compressor unit;
means for computing a real time alarm limit for the electrical current drawn by the drive motor for the compressor unit based upon the flow rate of the heat exchange medium passing through the evaporator unit, the temperature of the heat exchange medium entering the evaporator unit and the temperature of the heat exchange medium leaving the evaporator unit under a real time cooling load condition being experienced by the chiller;
means for comparing the sensed electrical current drawn by the drive motor unit with the computed real time alarm limit for the electrical current drawn by the drive motor; and
means for generating a warning when the sensed electrical current drawn by the drive motor exceeds the computed real time alarm limit.
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Abstract
The electrical current drawn by a drive motor for the compressor unit of a chiller is monitored relative to a real time alarm limit for this electrical current. The real time alarm limit is computed from time to time by a microprocessor. The value of the computed alarm limit will vary with the cooling load being experienced by the chiller'"'"'s evaporator unit.
84 Citations
12 Claims
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1. A system for monitoring the electrical current drawn by a drive motor for a compressor unit of a chiller that includes an evaporator unit with a heat exchange medium passing therethrough, said system comprising:
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an electrical current sensor for sensing the electrical current drawn by the drive motor for the compressor unit; means for computing a real time alarm limit for the electrical current drawn by the drive motor for the compressor unit based upon the flow rate of the heat exchange medium passing through the evaporator unit, the temperature of the heat exchange medium entering the evaporator unit and the temperature of the heat exchange medium leaving the evaporator unit under a real time cooling load condition being experienced by the chiller; means for comparing the sensed electrical current drawn by the drive motor unit with the computed real time alarm limit for the electrical current drawn by the drive motor; and means for generating a warning when the sensed electrical current drawn by the drive motor exceeds the computed real time alarm limit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for monitoring the electrical current drawn by a drive motor for a compressor unit of a chiller that includes an evaporator unit with a heat exchange medium passing therethrough, said process comprising the steps of:
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sensing the electrical current drawn by the drive motor for the compressor unit; computing a real time alarm limit for the electrical current drawn by the drive motor based upon sensing the flow rate of the heat exchange medium passing through the evaporator unit, the temperature of the heat exchange medium entering the evaporator unit and the temperature of the heat exchange medium leaving the evaporator unit under a real time cooling load condition being experienced by the chiller; comparing the sensed electrical current drawn by the drive motor with the computed real time alarm limit for the electrical current drawn by the drive motor; and generating a warning when the sensed electrical current drawn by the drive motor exceeds the computed real time limit. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification