Patent ID: 8448459
Filing Date: 2013-05-28
Classification: F25B,G01K,G05B,Y02B

Abstract:
1. A system comprising: a compressor connected to a condenser and an evaporator; a condenser sensor that outputs a condenser signal corresponding to at least one of a condenser pressure and a condenser temperature; an evaporator sensor that outputs an evaporator signal corresponding to at least one of an evaporator pressure and an evaporator temperature; an inverter drive that modulates a frequency of electric power delivered to said compressor to modulate a speed of said compressor; a control module that receives compressor power data and compressor speed data from said inverter drive, determines a measured condenser temperature based on said condenser signal, determines a measured evaporator temperature based on said evaporator signal, calculates a first derived condenser temperature based on said compressor power data and said compressor speed data, calculates a second derived condenser temperature based on said measured evaporator temperature, said compressor power data and said compressor speed data, and compares said measured condenser temperature with said first and second derived condenser temperatures to determine whether any of said measured condenser temperature and said first and second derived condenser temperatures are inaccurate.