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Cooling Control Disclosure Number: IPCOM000084381D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 73K

Publishing Venue


Related People

Enrietto, RA: AUTHOR [+1]


A building chilled water cooling system is controlled by an analog/digital computer processor.

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Cooling Control

A building chilled water cooling system is controlled by an analog/digital computer processor.

In Fig. 1, a single power demand meter is connected to a series of chillers used for cooling buildings. Each chiller, for example chiller A in Fig. 2, pumps chilled water from an evaporator to heat exchangers in the buildings. Heat is returned to the evaporator by further circulation of the water. At the evaporator, the heat is removed by a standard FREON* compression/expansion refrigeration cycle and is transferred to another water circulation system that dissipates the heat into the atmosphere through an evaporation cooling tower.

Total chill water system efficiency is optimized, power consumption is reduced, power demands are reduced and greater utilization of chiller resources is realized by controlling the refrigeration-compressor vane angle on the chillers, adjusting cooling tower fan speed and by reporting other critical data. Control adjustments are made as a function of the electrical power demand, outside wet- bulb temperature, the cooling tower temperature, FREON evaporator temperature and chilled water supply temperatures.

Initially, the number of online chillers required is determined and the corresponding monitor and control signals are activated by a computer. Then, in Fig. 3, cooling tower fan speeds are increased until the water returning from the tower drops to the optimum temperature, which is determined by the outside wet- bulb temper...