Outdoor Unit Heat Exchanger - Hitachi RWM-(H)FSN3E Technical Catalogue

2 Features and benefits
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Outdoor unit heat exchanger

High-efficiency heat exchanger
• Compact design and high-efficiency by arranging narrow heat exchanger tubes in 3 rows. (befo-
re Ø9.53mm, now Ø7mm).
• Newly-developed high-efficiency heat transfer fin. The ventilating resistance is reduced by 20% from previous mo-
dels.
• Heat exchanger configuration aiming at fluid loss reduction.
Side flow technology
Energy-saving and uniform air velocity distribution by side flow technology.
Improved performance by subcooling circuit
The system performance is improved by enlarged heat transfer area of outdoor unit and subcooler heat exchanger.
Rear side
Sub-cooler
Air
inlet
33
TCGB0070 rev.3 - 04/2012
High-efficiency heat transfer fin
Improved heat transfer capacity
Approx. 10%
Increase
Newly-developed fin
Current fin
Heat trans-
fer ratio
Face wind velocity
Newly-developped fin
(Ø7 Heat transfer tube)
Fin cross-sectional
surface
(slit alignment)
Air flow
Air
inlet
Front side
Air
outlet
Air ventilation resistance
Approx. 20%
Reduction
Current fin
Newly-developed fin
Frost formation amount
Current fin
(Ø9.53 Heat transfer tube)
Fin cross-sectio-
nal surface (slit
alignment)
Air flow
Air
outlet
Air speed (m/s)
Increase of enthalpy
due to the use of the
sub-cooling circuit.
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