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TECHNICAL REPORTS 100 33 47 35 120 100 80 60 40 20 0 Table 1 Thermal conductivity of insulation material Thermal conductivity W/mK Glass wool for con- ventional specification 0.038 Foamed polystyrene for new specification 0.034 Twisted- pipe type Type A Type B Type C With the HP water heater market rapidly expanding, the JIS for home-use HP water heaters will come into effect in April 2008. The details of the standard are currently being discussed. The new JIS standard will change the evaluation reference from conventional “rating of COP (coefficient of performance)” to “actual operating efficiency of equipment” on annual basis, the same as for air-conditioners. This suggests key points for future technological development. Since FY2006, manufacturers have been conduct- ing joint studies with NEDO (New Energy and Industrial Technology Development Organization), and are likely to launch new products from next year based on the results. We must continuously develop technologies to meet the changing performance evaluation criteria, improve the functionality of each system, expand the product range, and meet the need for energy saving measures. 6. Conclusions Mitsubishi will strive to expand the sales of new products and continue to develop energy-saving plant facilities. 7. References (1) H. Maeyama et al.: Development of Rotary Com- pressor for CO2 Heat Pump Water Heater, Mitsu- bishi Advance (2) H. Nakahide et al.: Technology for Controlling the Wear on the Top of Vanes Used for CO2 Refriger- ant Rotary Compressor, Mitsubishi Advance Fig. 4 Heat transfer efficiency per unit length of water pipe 4.3 Improvement of heat insulation of tank unit The insulation material of the hot-water tank unit of this water heater is reinforced. Figure 5 shows the appearances of both conventional insulation material and the reinforced insulation material. The conventional insulation material (Fig. 5(a)), glass wool, was wrapped around the stainless steel tank. With the new water heater, molded foamed polystyrene (PS) is configured to match the exterior shape of the tank to improve adhesion between the insulation material and the tank. 5. Future Developments (a)Conventional insulation material: glass wool (b)New insulation material: foamed polystyrene Fig. 5 Appearance of insulation material As shown in Table 1, the thermal conductivity of the new heat insulation material is lower than that of the conventional material. In addition, the insulation struc- ture is designed to increase the insulation of the con- nection pipe on the tank and controlled heat radiation by providing a gap between the insulation material and the housing covering the insulation material. As a result, the total heat insulation efficiency of the tank unit is improved such that the temperature inside the tank is reduced by approx. 15% over a certain period. 8 Heat transfer efficiency ratePDF Image | Heat Pump with Natural Refrigerants 3041
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