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TECHNICAL REPORTS Development of CO2 Heat Pump Hot Water System “ECO CUTE” 1. Introduction The market of CO2 heat pump hot water system “ECO CUTE”, which complies with the Ministry of Economy, Trade and Industry’s CO2 emission reduction plan, has been spreading rapidly. The new system launched in June 2006 employs Mitsubishi’s latest technologies and has been a commercial success thanks to its competitiveness. This report introduces the technologies of the compressor, heat exchanger, heat insulating material, etc. in the new system. 2. Environment of Electric Hot Water Sys- tem Business In March 2002, the “Outline for Promotion Effects to Prevent Global Warming” was established and spe- cific countermeasures against global warming to be taken by various sectors were publicly announced by the government. Since the Kyoto Protocol came into effect in February 2005, the importance of counter- measures against global warming has grown to en- compass all sectors and organizations in Japan related with energy and the environment, with the numerical targets specified for compliance. The final energy consumed by the consumer and general household sector has increased largely, follow- ing the freight and passenger transport sector, so ur- gent countermeasures in these sectors are necessary. The outline mentioned above includes specific, detailed descriptions of countermeasures for the consumer sector, such as “expanding the range of application of top-runner standards”. From the trends of energy con- sumption by application, about 60% of energy is con- sumed by room heating and water heating systems in this sector. The ratio of all-electric homes has been increasing year by year due to heavy marketing to the residential sector by electric power companies throughout the country. As a result, electric water heaters, IH cooking heaters, solar power generation systems, and the like are increasingly accepted in electricity markets. These groups of products are a key part of our all-electric strategy. The Ministry of Economy, Trade and Industry has set a specific target of 5.2 million heat pump water heaters installed by FY2010. Both manufacturers and power companies have drawn up plans with their re- spective policies and schemes. In addition, local gov- ernments are increasingly accepting applications by end users for grants or have established their own subsidy systems. In this report, we discuss the technological features of the ECO CUTE heat pump water heater using envi- ronment-friendly CO2 natural refrigerant (called HP water heater hereafter). 3. Features of ECO CUTE ECO CUTE is a nickname commonly used by power companies and water heater manufacturers for HP electric water heaters that use natural refrigerant and are widely used in industry. Mitsubishi started to commercialize HP water heaters in FY2001, and a total of 100,000 units were actually sold from FY2001 to FY2005. The technological features of Mitsubishi’s HP water heaters are as follows. (1) High-efficient heat pump system The performance is about 3 to 4 times that of conventional heaters. (2) Use of environment-friendly natural refrigerant CO2 refrigerant, which does not destroy the ozone layer and has low global warming potential, is used. (3) Economical nighttime power is used. 4. Technological Features of Mitsubishi Products Mitsubishi “diahot” has the largest share of the HP water heater market. In June 2006, we integrated the technologies of the “diahot” hot water tank with heat pump technologies used in our industry-leading air-conditioning systems, and launched new products as shown in Fig. 1 which are far superior to those of other manufacturers. The technological features of the products are described below. (1) High-efficiency compressor and high-efficiency heat exchanger were developed to achieve the industry-leading rating of COP4.9. (2) New foam insulation having 15% better insulating performance than conventional insulation material is used in the hot water tank, increasing the heat insulation capacity. Author: Tetsuji Okada* *Gunma Works 6PDF Image | Heat Pump with Natural Refrigerants 3041
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