Supervisory control of chilled water temperature

Details Supervisory control of chilled water temperature Supervisory control of chilled water temperature

1983-05-26

1984-07-17

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62210, 62224, 62230, F25D 1702, F25B 4104

Patent

active

044598181

ABSTRACT:
An arrangement and method of controlling optimum chilled water temperature supplied to a process by a pump, the water being chilled by coolant in a coolant cycle having a compressor and a load valve, comprises first and second sensors for sensing a supply and a return temperature to and from the process. A value is obtained for the amount of work done by the pump and the compressor with that value as well as the supply and return temperature values being supplied to a supervisory control. The supervisory control operates to generate a reference temperature which is a function of the supply temperature but which is either above or below the supply temperature depending on a ratio between the difference in work and a change in the difference between the supply and return temperatures. When the ratio is about zero this indicates the difference between supply and return temperature is at an optimum and the reference temperature is the same as the supply temperature. When the ratio is negative, the reference temperature is below the supply temperature and when the ratio is positive the reference temperature is above the supply temperature. The reference temperature is used in a temperature controller which is connected to the load valve for adjusting the setting of the valve according to a load demand signal which is chosen to be either the reference temperature if that is less or a demand value which depends on the amount of demand necessary for the process.

REFERENCES:
patent: 3204423 (1965-09-01), Resh, Jr.
patent: 3499297 (1970-03-01), Ruff et al.
patent: 4201061 (1980-05-01), Heffernan
patent: 4270361 (1981-06-01), La Barge
patent: 4282718 (1981-08-01), Kountz et al.
patent: 4429541 (1984-02-01), Kamejima et al.

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