Daikin FXSQ100P7VEB [16/370] Features of this model series

Daikin FXSQ125PVE [16/370] Features of this model series
Features of This Model Series SiBE311209
7 General Information
4. Features of This Model Series
This Model Series feature efficient heating operation conducted by adopting the "Two-stage
Compression System" at low outdoor air temperatures.
<Two-stage Compression System>
This is a system to conduct efficient heating operation by two-stage compression with two
compressors connected in series.
The system is designed to separate gas and liquid with the "Gas & liquid separator"
incorporated in the function unit to bypass all gas refrigerants that do not contribute to
evaporation to the high-stage-side compressor on the high stage side, thus providing increased
evaporator efficiency.
Furthermore, since the high-stage-side suction gas temperature falls, radiation loss also
reduces to provide increased compressor efficiency.
New System
(At low outdoor air temperatures)
Conventional System
Indoor unit
Function unit Outdoor unit
Indoor unit
Gas & liquid
separator
High-stage-side
compressor
Low-stage-side
compressor
Indoor unit
Indoor unit
Outdoor unit
Compressor
Heating capacity
Pressure
Indoor unit (condenser)
Expansion valve (1)
Gas & liquid separator
High pressure
High-stage-side
compressor
Compressor power input
Intermediate
pressure
Low-stage-side
compressor
Increase capacity and COP.
Expansion valve (2)
Outdoor unit (evaporator)
Low pressure
Compressor power input
Increase COP.
Evaporator capacity
Enthalpy
Pressure
Heating capacity
Radiation
loss
High
pressure
Indoor unit (condenser)
Expansion valve (1)
Outdoor unit (evaporator)
Low
pressure
Compressor
power input
Evaporator capacity
Enthalpy
Hot gas
circuit

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