Method for detecting a fault in an HVAC system

Details Method for detecting a fault in an HVAC system Method for detecting a fault in an HVAC system

2005-01-04

2009-02-24

Smith, Duane S (Department: 1797)

Gas separation: apparatus

With signals, indicators, measuring, or testing means

C096S026000, C096S414000, C096S117000, C096S421000, C055SDIG034, C116S268000, C116S271000, C116SDIG025, C062S198000, C062S199000, C062S200000, C062S225000, C062S227000

Reexamination Certificate

active

07494536

ABSTRACT:
A bypass factor of an evaporator is used to indicate when an air filter of an HVAC is clogged. The bypass factor represents the amount of air that is bypassed without direct contact with the evaporator. As the air filter clogs, the bypass factor decreases. The bypass factor can also be used for early detection of clogging of the air filter. A first bypass factor is calculated by using the temperature measurements, and a second bypass factor is calculated by using the airflow rate of the air. The difference between the two bypass factors determines the error. An increase in the error indicates that the air filter is clogged. A coefficient of performance of the evaporator can also be calculated to detect if the air filter is clogged. A decrease in the coefficient of performance indicates that the air filter is clogged.

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