24 June 2014
Recently, the year-round performance of heating, ventilating, and air-conditioning (HVAC) systems has been greatly enhanced. A major reason for this improvement is the introduction of the seasonal performance factor (SPF) for rating systems, which has replaced
the coefficient of performance. There is a demand for manufacturers to improve the SPF; thus, a high-precision simulation technique must be established to evaluate system performance under various driving
conditions throughout the year. Accordingly, high-precision mathematical models of a CO2
heat pump water heater, a desiccant air-conditioning system, a hybrid air-conditioning system for a data center, and an absorption heat transformer were developed, and their validity was experimentally investigated. A simulator called “Energy flow +M” was also developed to easily calculate the performance of HVAC systems, based on the modular analysis theory suggested by the authors and the mathematical model that we developed.
In this study, the mathematical models of the above systems were validated using an experiment with an actual machine. Furthermore, it was verified that we could easily calculate the performance of HVAC systems with our simulator using a graphical user