| 摘要 |
A heat exchanger of the present invention includes: a shell; an incurrent pipe for guiding heat source water into the shell; a first refrigerant tube having a first spiral tube portion; a second refrigerant tube having a second spiral tube portion which has a bigger radius than the first spiral tube portion; and an excurrent pipe where the heat source water, heat-exchanged with a refrigerant, is discharged. The first and second refrigerant tubes are arranged in a row, and the second spiral tube portion has a bigger pitch per turn than the first spiral tube portion, while having a smaller number of turns to make the first and second refrigerant tubes have the same flow passage length or minimize the flow passage length difference between the two, and to prevent a degradation of performance, which can occur when the flow passage lengths of the first and second refrigerant tubes are different. |
