Patent ID: 9677819
Date: 2017-06-13
CPC Classifications: F25B,F28D,F28F

Claim:
1. A heat exchanger, comprising: a shell; at least one injection pipe to guide a heat source fluid to an inside of the shell; a first refrigerant tube comprising a first spiral tube; a second refrigerant tube comprising a second spiral tube having a radius larger than a radius of the first spiral tube, each radius being measured from a center of the respective spiral; and a discharge pipe to which the heat source fluid heat-exchanged with a refrigerant is discharged, wherein the first refrigerant tube and the second refrigerant tube are connected in parallel, and the second spiral tube portion has a larger pitch between turns and a smaller number of turns than the first spiral tube, wherein the number of turns of the second spiral tube is determined by the following equation below where, N2 is the number of turns of the second spiral tube, N1 is a number of turns of the first spiral tube, R1 is a radius of the first spiral tube, and R2 is a radius of the second spiral tube.