To study the variation of performance of air conditioning system in the condition of variable chilled water temperature

a performance prediction model for air conditioning system including chiller and cooling coil which based on the modeling method making unknown parameter lumped and getting model parameters from measured data is developed. An experimental device is built up to validate this performance prediction mode

and simulation on performance of air conditioning system under variable chilled water temperature condition is studied. The results show that the relative errors of performance parameters such as cooling capacity and COP (coefficient of performance) between simulation and experiment are within 10%. The increase of COP caused by chilled water temperature increasing from 7℃ to 15℃ is 21.1% when return-air dry-bulb temperature of cooling coil is 28℃

and the dehydration quantity decrease 96.4%. It can be concluded that return-air dry-bulb temperature influences the energy saving effect and dehydration quantity of air conditioning system with variable chilled water temperature

the influence of chilled water temperature on performance of air conditioning system and comfort of indoorenvironment should be considered

and the variation range should be controlled based on setting indoor temperature and supply-air state.