HVAC compressor prognostics
First Claim
1. An HVAC compressor prognostics system, comprising:
- a compressor having an inlet and an outlet;
an electric motor operatively coupled to the compressor;
a suction pressure sensor operatively coupled to the inlet of the compressor;
a discharge pressure sensor operatively coupled to the outlet of the compressor;
a motor speed indicator operatively coupled to the electric motor;
a motor input power indicator operatively coupled to the electric motor; and
a prognostic-diagnostic unit coupled to the suction pressure sensor, the discharge pressure sensor, the motor speed indicator, and the motor input power indicator,wherein the prognostic-diagnostic unit determines an expected input power from a suction pressure signal received from the suction pressure sensor, a discharge pressure signal received from the discharge pressure sensor, and a motor speed signal received from the motor speed indicator, andwherein the prognostic-diagnostic unit compares the expected input power to the motor input power indicated by the motor input power indicator to determine compressor health.
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Accused Products
Abstract
Systems and methods for determining the health of a compressor are disclosed. In one embodiment, a prognostic-diagnostic unit (PDU) compares expected compressor power consumption, based on current operating conditions of the HVAC system, to actual compressor power consumption. If the actual power consumption is within a predefined range of the expected power consumption under current operational conditions, the HVAC system is determined to be operating properly. If the actual power consumption deviates from the expected power consumption, a fault is indicated. An appropriate action is taken, such as displaying a fault alert, transmitting a fault message to another device, and storing information relating to the fault for later retrieval to assist troubleshooting.
43 Citations
12 Claims
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1. An HVAC compressor prognostics system, comprising:
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a compressor having an inlet and an outlet; an electric motor operatively coupled to the compressor; a suction pressure sensor operatively coupled to the inlet of the compressor; a discharge pressure sensor operatively coupled to the outlet of the compressor; a motor speed indicator operatively coupled to the electric motor; a motor input power indicator operatively coupled to the electric motor; and a prognostic-diagnostic unit coupled to the suction pressure sensor, the discharge pressure sensor, the motor speed indicator, and the motor input power indicator, wherein the prognostic-diagnostic unit determines an expected input power from a suction pressure signal received from the suction pressure sensor, a discharge pressure signal received from the discharge pressure sensor, and a motor speed signal received from the motor speed indicator, and wherein the prognostic-diagnostic unit compares the expected input power to the motor input power indicated by the motor input power indicator to determine compressor health. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification