Shuichi Umezawa

Application Study of a Heat Pump Producing High Temperature and High Pressure Water for an Industrial Drying Process

This paper reports application study of newly developed turbo heat pump for 130 °C water for an industrial process in an actual factory. The heat pump is characterized by high efficiency and large heat output, by using a state-of-the-art turbo compressor. The heat pump requires a low temperature heat source. The heat demand is for several drying furnaces in the factory, which requires producing hot air of 120 °C. The heat exchanger was designed to produce the hot air. Experiments were conducted to confirm the performance of the heat exchanger with a reduced size of the heat exchanger. Low temperature heat sources are from both exhaust gas of the drying and annealing furnaces. The heat exchangers were also designed to recover heat of the exhaust gas. As a result, it was confirmed that the heat pump was able to satisfy the present heat demand while retaining high efficiency.

Field Test of Newly Developed Turbo Heat Pump for Hot Water

Reduction of CO2 emissions and energy saving are the urgent issues for many fields of industries at present. Hot water, occupying considerable energy consumption rate in the whole industry, is generally generated using combustion gas being higher than 1,000 centigrade at boilers. However, the temperature loss is large at boiler process. Accordingly, we thought that energy saving could be accomplished if hot water could be generated using heat pumps. This presentation reports field test of a newly developed turbo heat pump for hot water in an actual factory. The heat pump is characterized by high efficiency and large amount of heat output, which equals approximately steam of 1,000 kg / hour, using turbo compressor. As a result of the field test, it was confirmed that the performance of the heat pump was the same as that of design.