Refrigeration – Automatic control – Of external fluid or means
Patent
1978-03-24
1981-04-21
Wayner, William E.
Refrigeration
Automatic control
Of external fluid or means
62201, 62209, 62229, 236 91F, F25D 1702, G05D 2300
Patent
active
042624916
ABSTRACT:
Modulating system for electrically or pneumatically controlled chillers in which a sensor senses the space condition, in a controlled environment or space. Output signals from an enthalpy sensor or other sensor representing the space condition are fed to chiller modulator electronic controls and thence to the chiller modulator interface controls, be they electric or pneumatic. The sensor monitors the conditions in or returning from the controlled space or environment. By measuring both humidity and temperature, the enthalpy sensor generates an effective temperature or comfort level. The input signal from the sensor is compared to an operator adjustable set-point. If the measured condition is less than the set-point, an error signal is generated which is proportional to the difference multiplied by an operator-set sensitivity control. The modulator interface control converts the error signal into a physical offset either applied in series with the chiller's own sensor, or is used to reset the set-point of the chiller control system. In the case of a chiller with a negative temperature coefficient resistance sensor, an appropriate amount of resistance is added in series with the sensor. In the case of a chiller with a positive temperature coefficient resistance sensor and appropriate amount of resistance is subtracted in series with the sensor. If the chiller sensor is pneumatic, a bleed valve is opened to change pressure which resets the set-point of the pneumatic control system.
REFERENCES:
patent: 3204423 (1965-09-01), Resh, Jr.
patent: 3362185 (1968-01-01), Harnish
patent: 4060997 (1977-12-01), Shultz et al.
patent: 4201061 (1980-05-01), Hefferman
Burch John
Chorey James E.
Controlled Energy Systems Company
Tanner Harry
Wayner William E.
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