| 摘要 |
<p>This warming device has a cascade refrigerating system comprising a high-temperature-side refrigeration circuit (Ra) and a low-temperature-side refrigeration circuit (Rb) mounted on the same case (K), is provided with a water circuit (H) for circulating water into the water-side flow path (3b) of a water and refrigerant heat exchanger (3), and uses a non-azeotropic refrigerant mixture satisfying the following equation as the refrigerant used in the high-temperature-side refrigeration circuit (Ra): the temperature glide (temperature tilt) of the refrigerant when condensed = the temperature difference between the inlet-side water temperature and the outlet-side water temperature of the water and refrigerant heat exchanger - the degree of supercooling of the refrigerant [the temperature glide of the refrigerant when condensed = the condensation temperature on a saturated gas line - the condensation temperature on a saturated liquid line]. As a consequence, the performance loss caused by the temperature difference between water and the refrigerant within the water and refrigerant heat exchanger (3) and the performance loss caused by the temperature difference between the high-temperature-side refrigerant and the low-temperature-side refrigerant in a cascade heat exchanger (4) can be reduced, thereby improving the coefficient of performance.</p> |
