Abstract
For design of thermal storage and operation control of HVAC system with thermal storage tank, a prediction method of thermal mixing behavior in the storage tank under operating condition is required. In this paper, a mixing model for temperature-stratified thermal storage tank is presented. The mixing model is modified from the mixing model which is based for the conditions that input water temperature and flow rate are kept constant and the initial temperature in the storage tank is uniform. Our mixing model is applied to numerical calculation for water temperature in the thermal storage tank under variable input conditions such as actual operation conditions. And three parameters which are included in the mixing model were identified from experimental results with variable input conditions. The Experiments were performed by using two equipments with different sizes of thermal storage tank. It was found that calculated results by using the mixing model are agree well with the experimental results with variable input conditions.
