| 摘要 |
<p>In a cogeneration system that stores hot water heated by exhaust heat of a generator in a hot water storage tank, a situation in which there is a risk of freezing of water in a water circulating passage is accurately grasped, and thus anti-freezing control prevents the freezing from occurring and unnecessary anti-freezing control is reduced to suppress the drop in efficiency of the system. When determined that an environmental temperature Ta is lower than a lower-limit value Ta_min, it is determined whether or not a temperature difference ”T (= Tr1 - Tr2) between a radiator inlet temperature Tr1 and a radiator outlet temperature Tr2 exceeds a predetermined value ”T0, and when determined that the temperature difference exceeds the predetermined value ”T0, it is determined that there is a risk of freezing of the water in the water circulating passage and an command to execute the anti-freezing control is output.</p> |
