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Market Report: Japan Hideaki Maeyama, Heat Pump & Thermal Storage Technology Center of Japan (HPTCJ), Japan This article describes trends in the shipments of room air conditioners, commercial air conditioners, and domestic heat pump water heaters, which are typical products in the Japanese heat pump market, over the past 20 years. Recent product technology trends are also described. In addition, the trends in use of industrial heat pumps is over- viewed based upon information obtained from HPT Annex 48 activities. Finally, the role of heat pumps in Japan's en- ergy conservation policy and the direction of technology developments by sector in energy conservation technology development strategies are described. Introduction Japanese heat pumps have evolved as products that cor- respond to the Japanese climate, housing style, and life- style. There is growing use of room air conditioners that individually air-condition each room and can be used for heating and cooling, heat pump water heaters (Eco-Cute) using CO2 refrigerant that can store hot water at high temperatures, and multi air conditioners for buildings that can be connected to many indoor units. In industrial use, the spread of industrial heat pumps is promoted by the energy conservation measures of the Agency for Na- tural Resources and Energy of the Ministry of Economy, Trade and Industry, and future growth can be expected. Japan's climate and heat pumps Figure 1 shows the monthly average, maximum and mi- nimum temperatures in Tokyo. The maximum summer temperature is about 32 °C and the minimum winter Download and share this article temperature is about 2 °C. A heat pump can be used for both cooling and heating, and a high COP can be secured in both uses. Therefore, room air conditioners that heat and cool have been developed and commercialized for a long time, and air conditioners for both cooling and heating became mainstream in the 1980s. In addition, as a technology to compensate for the imbalance between cooling and heating capacities, a variable speed tech- nology for the compressor using an inverter, electronic expansion valve and optimal system control has been continuously developed. It is also applied to other heat pump products. Market trends and features of each product Representative heat pump products in Japan are descri- bed below. They include room air conditioners, commer- cial air conditioners, domestic heat pump water heaters and industrial heat pumps. MARKET REPORT Fig. 1: Outdoor Air Temperature in Tokyo (Average of 2009–2018). Source: Aggregate JMA data [1] VOL.38 NO 1/2020 HPT MAGAZINE 23PDF Image | Integration of Heat Pumps into the Future Energy
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