Abstract
A control strategy for the chiller outlet water temperature reset of a chiller plant with the objective of saving energy was developed. The reset scheme was verified against a hypothetical air conditioning plant which supplied conditioned air to a large single room. The dynamic mathematical models of the hypothetical air conditioning system and the room developed in References 1 and 2 were used in the study. These dynamic mathematical models were simulated and set up on an analogue computer which was linked to a digital computer where the reset scheme was programmed and implemented. The dynamic behaviours of the hypothetical air conditioning plant and the room were monitored and used by the digital computer for the reset scheme. In the reset scheme, the effects of the airside control valve position, the room temperature and the time interval for the chiller outlet water temperature setpoint increment or decrement were investigated. The objective function used in the reset scheme was found to be: 0.08 room temperature error + 1.64 (0.75 - control valve position), indicating the dominance of the airside control valve position in the reset scheme.
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