Control Systems for Heating, Ventilating, and Air by Roger W. Haines
By Roger W. Haines
Control structures for Heating, Ventilating and air-con, 6th Edition is whole and covers either regulate platforms and glossy regulate expertise. the fabric is gifted with no bias and with no prejudice towards specific or software program. Readers with an engineering measure should be reminded of the psychrometric procedures linked to heating and air-con as they study of a number of the controls schemes utilized in the range of heating and air con procedure varieties they are going to encountered within the box. upkeep technicians also will locate the ebook worthwhile since it describes a variety of regulate and keep an eye on techniques that have been utilized in the earlier and are commonly used in such a lot current heating and air con systems.
Designers of latest structures will locate the basics defined during this ebook to be an invaluable place to begin, and they're going to additionally take advantage of descriptions of latest electronic applied sciences and effort administration platforms. This expertise is located in sleek construction HVAC procedure designs.
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Extra resources for Control Systems for Heating, Ventilating, and Air Conditioning
This is the solenoid that can then be used to operate a valve or a set of contacts. Solenoid valves are made in many sizes and arrangements, for control of water, steam, refrigerants, and gases. Figure 3-4 shows a typical two-way valve. This valve is held in the normally closed position by fluid pressure. When the coil is energized, the plunger is lifted and opens the valve. Some models are arranged with an internal pilot: a small port that is opened by the solenoid allowing fluid pressure to open the valve.
POINT ADJUBTllEN1' CAPACITY AMPliFIER OPTION EXH IlRANCHLINE PRESSURE TO CONTROlLEO DEVICE Figure 2-9 Single-input PI sensor-controller system. ) This will provide an additional downward acting force on the diaphragm assembly, closing the nozzle. The output pressure will build up causing the pressure P4 to build up. Assuming that pressure P1 changes slowly and that the diaphragm separating chambers 2 and 3 is twice the area of the other diaphragms, the pressure P4 would increase to 11 psig before the system reaches a temporary balance.
REMOTE SENSOR r*:t:=_SUPPLY AIR ~ 36 Control Systems for Heating, Ventilating, and Air Conditioning DAY INDEXING SWITCH LEI/ERS ADJUSTING SCREWS -~ -~ -5 . ;"J. - I SWITCH LINE Figure 2-22 Dual-temperature thermostat. (Courtesy Johnson Service Company). 10 Dead-Band Thermostats The dead-band or zero-energy band thermostat was developed to conserve energy. Its design is based on the assumption that the comfort range of temperature is fairly wide, and no heating or cooling is required over that range.