旋回流ノズルを用いた空調機組込型加湿装置の実負荷条件下における性能評価

摘要

事務所ビルの冬期の室內環境を良好に保っために,加湿装置とは異分野で使われていた旋回流ノズルを用いて高効率な空調機組込型加湿装置を開発した。旋回流ノズルは既往の加湿器である水スプレー式と比較して,噴霧粒子が均一かつ小粒径であることを特徴とし,暖房運転が減少して送風運転の時間数が多くなる暖房期間でも加湿効率が良い。また冬期の湿度環境の改善のほか,中間期には噴霧水の蒸発冷却効果を利用した細霧冷房装置としても活用できる。そこで本研究では事務所ビルの1フロアに開発した加湿装置を導入し,冬期の実負荷条件下における加湿性能の評価と中間期の加湿運転による細霧冷房効果について検証した。%The winter load in office buildings has been decreasing in recent years owing to improvements in the building insulation and the increasing number of OA instruments. Under these conditions, moistening performance of existing water-spray-type humidifiers deteriorates because temperature just after a hot water coil or in front of a humidifier falls in accordance with the decreasing heating operation. Aiming to cope with this situation, a humidifier for an air handling unit using a turning flow nozzle whose spray particle size is small and uniform compared to existing water-spray-type humidifier had been developed and installed into our office building, located in Matsumoto city. A performance assessment for two years from fiscal year 2012 to 2013 during winter under actual load was carried out to verify the indoor environment, energy savings and so on. Operational optimization was also taken into practice in fiscal year 2013 from the data obtained from the previous year. In addition, a spray water evaporative cooling effect test from the humidifier was also carried out during the midseason to verify the application possibility of the developed humidifier as a cooling device instead of the existing air-conditioning system. A Series of trial results from this practical study is shown in this paper. It was found that the developed humidifier's energy saving performance during winter is equivalent to the existing one and the humidifier maintains its efficiency even under low heat load conditions.