Operational optimization of a hybrid desiccant cooling system for building air conditioning system

초록

Hybrid desiccant cooling system has a higher electric coefficient of performance than that of electric heat pump system because evaporative cooler highly contributes to diminishing the cooling load. An abundant waste heat must be secured because of a thermal requirement for regenerating a desiccant rotor. However, the cooling capability of the evaporative cooler is not necessarily proportional to the amount of supplied heat. The optimized regeneration temperature of desiccant cooling system is acquired to maximize the cooling performance of the evaporative cooler. The hybrid desiccant cooling system model developed in our previous study was simulated to determine the optimized operating conditions under actual climate conditions of the summer season worldwide. The optimal value of temperature for desiccant rotor regeneration and the process air flow rate, those can minimize the electric power consumption, are obtained as a based on the outdoor absolute humidity and outdoor temperature. The effect of the room inlet temperature of the process air on the consumption rate of regeneration heat and electric power consumption is captured. The characteristics of the hybrid desiccant cooling system at the minimal and optimal regeneration temperatures were investigated and compared.

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