D-53 地下水循環型空水冷ハイブリッドヒートポンプシステムの研究開発 : (その2) SCWを用いた空水冷ハイブリッドヒートポンプシステムの年間性能予測

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We simulated a system using a standing column well (SCW) as a water-heat source, with an air/water-to-water hybrid heat pump capable of switching between air and water cooling. Although single-tube wells can reduce costs because they do not require the construction of a new reducing well, water returning from the heat pump could create a short circuit, adversely affecting the system. It is also expected that the amount of power required by the pump could vary greatly depending on the level of the groundwater table and other factors. We performed a comparative assessment of annual performance factors (APF) for the differences between systems using R407C and R410A refrigerant, differences in temperature due to SCW short circuits, differences in well-pump power, and differences due to climatic zone. As a result, we calculated an APF of 5.24 for the base system. We also found that a 21% improvement to APF can be expected by changing from R407C to R410A. We additionally found that under each condition, air/water hybrid cooling improved APF by 2 to 7% compared to water cooling.
社団法人空気調和・衛生工学会の論文
2008-08-08