Patent ID: 9593886
Date: 2017-03-14
CPC Classifications: F25B,F28D,F28F

Claim:
1. A heat exchanger comprising: a plurality of heat transfer tubes spaced from one another in a radial direction thereof and arranged vertically and longitudinally; a plurality of heat transfer fins spaced from one another and disposed in an axial direction of the heat transfer tubes; and a carbon dioxide refrigerant provided for circulation through the heat transfer tubes, wherein each of the heat transfer tubes has the heat transfer tubes are disposed at a vertical pitch L1 in a range of 3×D≦L1≦4.2×D, the heat transfer tubes are disposed at a longitudinal pitch L2 in a range of 2.6×D≦L2≦3.64×D, a number of longitudinal rows N of the heat transfer tubes is in a range of 2≦N≦8, the heat transfer fins are disposed at a pitch Fp in the axial direction of the heat transfer tubes, and a value of Fp/N is in a range of 0.5 mm≦Fp/N≦0.9 mm, the Fp/N value being given by dividing Fp by the number of longitudinal rows N of the heat transfer tubes.