In order to prevent the global warming, reduction of CO_2 emissions, including the emissions from the domestic sector, on a global scale is required. In regions with cold climates, such as Europe, hot-water room heating, powered by fossil fuel-burning boilers, composes the majority of energy consumption for heating. One of the CO_2 heat pump hot-water heating equipment's features is that it is capable of delivering high-temperature hot water equivalent to that provided by the boilers. By focusing on this feature, we have aimed to construct high efficiency CO_2 heat pump that can replace boilers to reduce CO_2 emissions through the reduction of primary energy consumption. Thus, we constructed a compressor combined with an expander and the hybrid density proportional control technology to develop high-efficiency heat pump system control, and enabled 15% improvement of an annual coefficient of performance (COP).
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