Hitachi YUTAKI S80 Series - Page 34

2. Features and benets
TCGB0075 rev.0 - 11/2012
34
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Indoor unit heat exchanger (For R410A and R134a)
The indoor unit has three heat exchangers:
- R410A-R134a plate heat exchanger
- R410A-H2O plate heat exchanger
- R134a-H2O plate heat exchanger
Highly efciency plate heat exchanger
The use of a plate heat exchanger type allows getting high performance due to the following advantages:
• High heat transfer surface coefcient, leading to very high values of the heat transfer overall coefcient.
• High ow turbulence in the uids, achieving turbulent regimes for low Reynolds numbers. This high turbulence allows
lower circulating speeds on the uids.
• Lower heat losses, since only the edges of the plates are exposed to the outside environment and additionally to
having small thicknesses, it can be readily isolated.
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Water pump
Low power consumption
The air to water heat pump incorporates a water pump to circulate the water ow into the system.
This pump is classied as low power consumption, resulting in a higher unit performance.
Water pump