Simple equations are presented for the control characteristics of a heated room with closed loop negative feedback proportional control. The combined effects of heating load, set point and proportional band on the controlled temperature are demonstrated. An expression is derived for the range of outside temperature over which control of the inside temperature is effective. The overall inside/outside temperature characteristic is illustrated.
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References
1.
1 Wolsey, W. H., Basic principles of automatic control, Hutchinson Educational, London (1975).
2.
2 Letherman, K. M., Automatic controls for heating and air conditioning, Pergamon, Oxford (in the press).
