PERFORMANCE OF COMBINED SYSTEMS WITH HEATPUMP AND SOLAR COLLECTORS

Abstract

The combined systems of solar thermal energy with heat pumps (HP) for detached houses have recently come to the market in Japan. In order to receive the economic benefit of inexpensive night-time power, water in the storage tank is partly boiled in late-evening or in the early morning by HP. Since the auxiliary heater is ahead of solar heat, its optimizing control becomes very difficult. Two types of the combined solar systems with air-water HP were tested from Apr. 2017 to Mar. 2018 in Saitama, Japan and their performance of each season or period was analyzed.