| 摘要 |
PROBLEM TO BE SOLVED: To display a sufficient space heating capacity even in a cold region where the lowest outside temperature in winter reaches -10 to -15 deg.C or lower, and miniaturize a thermal storage tank. SOLUTION: In a regenerative heat pimp air conditioner provided with a compressor 1, and outdoor unit 100 having an outdoor heat exchanger 6, a storage-type heat exchanger 61 and an indoor unit 200 having an indoor heat exchanger 50 to switch to a heating thermal storage operation, stored heat- utilizing heating operation and stored heat not-utilizing heating operation, operation is started with the stored heat-utilizing heating operation. When it is determined that the air conditioning load is relatively low, a changeover is made to the stored heat not-utilizing heating operation. When it is determined that he stored heat-utilizing heating operation should be performed after that, the stored heat-utilizing heating operation is performed again. |
