| 摘要 |
PROBLEM TO BE SOLVED: To quicken the response speed by operating a compressor while increasing the frequency immediately to a level corresponding to the set temperature of a user when an inverter heat pump is started initially and adjusting the opening of an expansion valve stepwise according to outdoor temperature conditions to reach a final set opening conformable to a set frequency. SOLUTION: The opening of an expansion valve is determined by dividing a total time elapsed before reaching an opening dependent on the frequency corresponding to a set temperature by such a minimum sustaining time of opening during that liquid refrigerant does not flow into a compressor. Based on the sustaining time of opening, the opening is adjusted from first start sustaining time of opening f to second, third, fourth and fifth start sustaining times of opening g, h, i, j, sequentially and an inverter heat pump is operated at a final set opening conformable to a set frequency. Since the operating frequency reaches a level corresponding to a set temperature through acceleration, start opening of the expansion valve is varied stepwise according to outdoor temperature conditions.
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