Automatic Controls for Heating and Air Conditioning. - download pdf or read online

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

ISBN-10: 0080232221

ISBN-13: 9780080232225

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Variable air-volume systems are most commonly applied to those buildings where there is a continuous requirement for cooling. 1 Zoning Although central plant for heating or air-conditioning has to be sized with regard to the total load occurring over the whole building, it is not true that all parts of the building experience their peak heating or cooling loads simultaneously. This is especially the case for cooling loads, which are strongly determined by solar intensity on particular faces of the building.

1. Main components in the compressed-air-supply system. reservoir at a pressure of about 5 bar. The compressor is controlled by an on/off pressure switch with a wide hysteresis (about 2 bar) so that the compressor is not switched on too frequently. The air is fed to a second filter and drier unit with a moisture trap which extracts any liquid water which has condensed in the air and 45 46 Automatic Controls for Heating and Air Conditioning would be carried along with it. 2 bar by a pressure-reducing valve and fed to a pipe manifold from where it can be distributed by narrow-bore copper or plastic pipework to the various controllers and sensors.

Individual control, where one thermostat can be affected by a terminal unit controlled by another thermostat, will produce unsatisfactory conditions due to simultaneous heating and cooling. The hot and cold deck temperatures are reset depending on outside temperature, according to a predetermined schedule. This type of system can give accurate control, but is rather wasteful of energy since there is unavoidable mixing of hot and cold air streams. Separate and individual control of both temperature and humidity are not really possible.

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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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