Importance

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Abstract

An object of the invention is to enable heat sources to be surely utilized in accordance with order of priorities and to prevent a overshooting of a temperature of cold water supplied from an evaporator even when a load is immediately changed. A flow of exhaust hot water supplied from a low-temperature heat source supply pipe to a low-temperature water regenerator is forcibly controlled to be the maximum. In such a state, when the cold water temperature measured by a temperature sensor becomes lower than a primary setting value of 7.degree. C., the flow of exhaust hot water supplied from the low-temperature heat source supply pipe to the low-temperature water regenerator is controlled by starting again a PID control using 6.degree. C. lower than the primary setting value of 7.degree. C. as reference. Moreover, a flow of exhaust gas supplied from a high-temperature heat source supply pipe to a high-temperature regenerator is forcibly controlled to be zero. In this state, when the cold water temperature measured by a temperature sensor becomes 8.degree. C. higher than the primary setting value of 7.degree. C., the flow of the exhaust gas supplied from the high-temperature heat source supply pipe to the high-temperature regenerator is controlled by starting again the PID control using the primary setting value of 7.degree. C. as reference.

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First Claim