Download PDF by K. M. Letherman, N. S. Billington: Automatic Controls for Heating and Air Conditioning.

By K. M. Letherman, N. S. Billington

ISBN-10: 0080232221

ISBN-13: 9780080232225

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Extra info for Automatic Controls for Heating and Air Conditioning. Principles and Applications

Sample text

The electrodes must be thin enough to permit the passage of water vapour. Since the dielectric constant of water is high, absorption of water molecules by the polymer film causes a large change in the electrical capacitance. The change in capacitance as relative humidity increases from zero to 100% is about 30% of the capacitance when exposed to dry air. An electronic circuit is used to generate a voltage output directly proportional to the change in capacitance and hence to relative humidity. 05% change in reading for 1°C change in temperature).

When power fails, an electromagnetic clutch, normally held in by the supply, is released and the spring is able to drive the valve or damper to a selected position. An alternative method is to provide a battery-operated power supply, also brought into operation by a line failure. For actuation of modulating valves, the motors are of reversible type, but for operation of two-position valves such as small butterfly valves, unidirectional motors may be used, with associated limit switches to stop the motor when the valve has been driven either fully closed or fully open.

0 ÙT, 1 Simple heating system w i t h modulating dampers and heater battery. D j , D 2 , D 3 : inlet, exhaust and recirculation dampers, T j : exhaust air sensor, T 2 : supply-air-limit sensor. not shown, is an essential component of the system. In cold-weather conditions the dampers are modulated to their extreme positions, with minimum fresh air and maximum recirculation. The valve on the heater battery provides control of the supply air temperature to offset heat losses. Note that the overall control is provided from the space temperature detector.

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Automatic Controls for Heating and Air Conditioning. Principles and Applications by K. M. Letherman, N. S. Billington

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