Hot Thermal Storage/Selective Energy System Reduces Electric Demand for Space Cooling As Well As Heating in Commercial Application

摘要

Based on an experimental residential retrofitincorporating thermal storage, and extensive subsequentmodeling, a commercial design was developedand implemented to use hot thermal storage to significantly reduce electric demand and utility energycosts during the cooling season as well as the heatingseason.To achieve air conditioning savings, the systemseparates dehumidification from sensible cooling;dehumidifies by desiccant absorption, using heatfrom storage to dry the desiccant; and then coolsat an elevated temperature improving overall systemefficiency.Efficient heat for desiccant regeneration isprovided by a selective-energy system coupled withthermal storage. The selective-energy system incorporatesdiesel cogeneration, solar energy and off-peakelectric resistance heating.Estimated energy and first cost savings, ascompared with an all-electric VAV HVAC system, are:30 to 50% in ductwork size and cost; 30% in fanenergy; 25% in air handling equipment; 20 to 40% inutility energy for refrigeration; 10 to 20% in refrigeration equipment; and space savings due tosmaller ductwork and equipment.