Method and device to detect the charge level in air conditioning

Details Method and device to detect the charge level in air conditioning Method and device to detect the charge level in air conditioning

1998-11-05

1999-11-23

Bennett, Henry

Refrigeration

With indicator or tester

Condition sensing

62126, 62127, 622283, F25B 4900

Patent

active

059879033

ABSTRACT:
A method for detecting a refrigerant charge in an air conditioning system. A charge detection device is connected to the air conditioning system that is operated to produce cooling air. The input temperature and pressure are measured from sensors in the air conditioning system. The charge detection device determines an actual sub cooling value of the air conditioning system from the input temperature and pressure. A desired sub cooling value is then assigned based on the ambient temperature and humidity of the air in which the air conditioning system is operating. The desired sub cooling value is obtained from a database in the charge detection device. The database stores predetermined sub cooling values at an optimum charge for a fixed compressor rpm, a fixed evaporator airflow and various ambient conditions encountered during normal operation. The charge detection device selects the desired sub cooling value according to the specific ambient temperature and humidity during operation of the air conditioning system. The actual sub cooling value is than compared to the desired sub cooling value. The difference between the actual sub cooling value and the desired sub cooling value is compared to the acceptable predetermined sub cooling value range. If the difference is outside of the range, the user is informed that the air conditioning system requires service.

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