Case Study

Brown Thomas:
Turnkey Heat Pump Installation

The Cork branch of luxury department store Brown Thomas was originally designed to have its heating loads satisfied by heat emitted from lights throughout the building along with general heat gains from people and equipment. However, they recently replaced these energy-intensive lights with energy-efficient LEDs and therefore a substantial reduction in indirect heating provided to the building which is “required” in the winter.

For cooling, Brown Thomas had been using a conventional (screw compressor) chiller. There was also a redundant decommissioned chiller (R22 refrigerant gas) on the roof which required replacement. Sirus was contracted to replace the old R22 Chiller with an efficient solution that would provide both heating in winter and cooling in summer.

The Solution

Sirus selected an Engie Pensum Heat Pump with the following specification:

  • 294.4 kW cooling capacity (ESEER of 3.62).
  • 277.0 kW heating capacity (SCOP of 3.31).
  • Refrigerant gas: R410A.

This project involved:

  • Supply, Installation including crane lifting onto the roof and Commissioning of Engie PENSUM Air Reversible Heat Pump.
  • Cranage of old R22 chiller off the roof.
  • Recovering and correct disposal of old R22 unit.
  • Traffic management and road closure in conjunction with Cork City Council.
  • Upgrade of the primary pump set (heating and cooling).
  • Installation of new pump-sets, pipework, insulation and electrical components.


The Result

By replacing the decommissioned R22 chiller with a new energy-efficient Engie Pensum Air Reversible Heat Pump, Brown Thomas can now heat the building in winter and cool it during the summer with the same machine (the heat pump). They also have the existing Chiller on standby in case further cooling is required in summer.

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