CO_2冷媒ヒートポンプを組み込んだ放射冷房とデシカント除湿の複合システムの提案と省エネルギー性に関する検討

摘要

空調における省エネルギー化に対応するため，CO_2冷媒ヒートポンプを用いた放射冷房とデシカント除湿の複合システムを設計し，エネルギー消費量について検討を行った.このシステムの省エネルギー性と有用性を検討するため，外気と室内の環境条件をパラメータとした複合システムのエネルギー消费量，COPなどを比較した.その結果，多くの条件下において外調機にデシカント除湿を用いることで省ェネルギー性が出る結果となった.特に，デシカント除湿の中で二段除湿の外気冷却型を用いた場合では，外気34.6℃，0.0186kg/kg(DA)の条件下では高効率の空冷チラーを用いた冷却除湿式と同等程度の省エネルギー性を有しつつ，外気30.7℃,0.0147kg/kg(DA)では消費電力量を30.0〜45.8%削減できる結果となった.%In this paper, we have proposed a combined radiant cooling and outside-air-cooled two-rotor desiccant air-conditioning system with a CO_2 remgerant heat pump. In order to investigate the performance of our proposed system, the system was compared with a conventional radiant cooling system with cooling and dehumidifying, a radiant cooling system with a normal desiccant system, and a desiccant system using a total enthalpy heat exchanger: The calculations were conducted using the operating conditions such as the outside air, the heat load, and the PMV(Predicted Mean Vote). Finally, the energy consumption and COP (Coefficient of Performance) of the chiller or CO_2 heat pump were evaluated. As a result, the COP of our proposed system increased by 0.5-0.8 compared to the radiant cooling system with a normal desiccant system. Therefore, the energy consumption of our system was reduced by -1.7-17.0% compared to the conventional radiant cooling system with cooling and dehumidifying when the outside air temperature is high. When the outside air temperature is low, the energy consumption of our system was reduced by 30.0-45.8% compared to the conventional system. In conclusion, it was revealed that the performance of our proposed system is excellent compared to the other systems under all conditions.