Freeze point protection for water cooled chillers

Details Freeze point protection for water cooled chillers Freeze point protection for water cooled chillers

1999-01-15

2000-02-22

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62130, 62201, 340588, F25D 1702

Patent

active

060266503

ABSTRACT:
A freeze point protection method and system is provided for water cooled chillers. The method prevents freezing of chilled water and damage to the chiller. The method allows the evaporator temperature to drop below a freezing temperature for a predetermined amount of time prior to shutting down the chiller. The temperature of the refrigerant in the water chiller is periodically sensed. The amount of time that the chiller is below a predetermined freezing temperature is periodically counted and compared with a determined maximum time that the chiller may operate at a sensed temperature below the predetermined freezing temperature without damaging the chiller. The method will shut down the water chiller if the counted time exceeds the determined maximum time. A system for shutting down a water cooled chiller to prevent freezing of chilled water is also provided.

REFERENCES:
patent: 4270361 (1981-06-01), La Barge
patent: 4493191 (1985-01-01), Hanson
patent: 4538422 (1985-09-01), Mount et al.
patent: 4549403 (1985-10-01), Lord et al.

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