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How HVRF works

DEP | MITSUBISHI ELECTRIC EUROPE | UK

Created on July 9, 2021

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Transcript

Schematic overview

All in heating mode

All in cooling mode

All in simultaneous heating & cooling

Keypoints

System has target condensing and evaporating temperatures for heating and cooling these are known as “Normal Fixed Targets”.Normal Fixed Targets which are used to control compressor frequency. Target Evaporating Temp (Te) = 0°C Target Condensing Temp (Tc) = 53°C

Cooling mode waterside

There is no LEV in the indoor unit. ΔT between the HBC plate HEX discharge and the branch return is controlled by the Flow Control Valve (FCV) opening.

Indoor coil

Heating mode waterside

There is no LEV in the indoor unit. ΔT between the HBC plate HEX discharge and the branch return is controlled by the Flow Control Valve (FCV) opening.

Indoor coil

Keypoints

Pump control – 30 – 100% on inverter pumps Flow control valve (FCV) on each port to open and close proportionately to set flow rate FCV / pump relationship:

  • The largest opening FCV determines pump speed
  • Maximises opening a valve before speeding up pump
  • Saves on energy use
  • Optimises capacity delivery to just what is required