放冷冷水の冷却水化による蓄熱式空調システムの昼間電力消費削減に関する研究: 第2報——冷却水化並列運転の提案とその効果

摘要

前報では，蓄熱槽内の放冷冷水を冷却水として用いる放冷冷水の冷却水化運転を提案し，シミュレーションにより総消費電力量は増加するものの，冷凍機消费電力を大幅に低減できることを示した.本報では，さらなる消费電力の削減と消费電力量の增加を最小限に抑えることを目的とし，冷凍機の部分負荷特性を考慮した運転方法の改良を行い，その効果を冷凍機2台運転のシミュレーションにより検証した.その結果，総消費電力量の増加を5%以内に抑えられ，蓄熱槽容量がピークカット時間帯の負荷より大きい場合は昼間の最高消費電力を最大34%,小さい場合はピークカット時間帯の最高消費電力を最大85%削減できる可能性を示した.%In a previous paper, a method for applying cold water discharged from a heat storage tank as the cooling water of a refrigerator was proposed. The proposed system was shown to decrease the electric power consumption during the day. However, the total electric energy consumption increased in comparison with a conventional system. Based on the partial load characteristics of present refrigerators, the present paper proposed the parallel operation of the previous system with the discharging operation of the heat storage tank to decrease the electric power consumption further during the day and inhibit the growth of the total electric energy consumption. The heat storage and electric power consumption of two refrigerator systems with heat storage tank using the conventional and proposed system were calculated. The proposed system reduced the growth of the total electric energy consumption to less than 5% compared to conventional system. During the day, the proposed system reduced the maximum electric power consumption by about 34% when V_(st)*(i.e., non-dimensional stored heat capacity based on heat load in peak cut period) ＞1 and by about 85% when V_(st)* ＜1.