Waterfall Estate private residence: efficient control

By Ilana Koegelenberg

When you add a pressureless integrated indirect thermal store (with a lifetime guarantee) to a super-efficient heat pump, you get a very efficient underfloor heating solution.

The project was started in May 2013 and completed in July 2015. It was tackled by Michael Carter of Techbutler.

Client brief

The client’s brief was to provide a warm and clean environment in the house, with individual room control as well as a low-energy house.

System description

Two Rotex Gmbh HPSU integrated heat pumps for domestic hot water as well as underfloor water heating radiant units were installed in a purpose-built hot water room. The two units, both using R410a refrigerant, a 16kW 500ℓ HPSU compact, and an 8kW 300ℓ HPSU compact unit, were installed in series to provide 800ℓ of hot water and 350m2 of underfloor water heating. The larger 16kW unit has an electrical top-up element to heat the domestic hot water system from 50°C to the required 65°C.

The two heat pumps can be controlled remotely via the Rotex mobile app. Which means the heating, cooling, and hot water temperature can be controlled from anywhere in the world!

The underfloor water heating was designed in accordance with the EN 1264 European Energy Saving Directive for underfloor water heating and a full piping layout was supplied by Rotex.

There were four in-wall distribution manifolds installed and connected to the underfloor water piping system. The Rotex Protect Integril polystyrene sheet system was installed, into which the PEX piping for carrying the hot and cold water was installed, which heats up the floor screed. A minimum of 50mm of screed was used on top of the 45mm pipe as well as high- and low-density polystyrene system.

The two heat pumps can be controlled remotely via the Rotex mobile app. Which means the heating, cooling, and hot water temperature can be controlled from anywhere in the world!

Challenges

The challenge is to ensure the integrity of the pipe after the underfloor water piping is installed and put under pressure whilst the floor screed is laid. The system has to remain under pressure until final handover, otherwise the pipes could be compromised and then the floor would have to be dug up and the pipes repaired.

This was not the case by connecting the underfloor water system to the main water throughout the construction.

All about efficiency

The system reduces the cost of heating a house using electricity. This system was designed with a heat load of 60W/m2 due to the design of the house, which has wall insulation, good north-facing orientation, and double glazing, compared to electrical underfloor wire heating that uses 100W/m2. The heat pump has a coefficient of performance (COP) of 3.5 and this gives a consumption of only 15W/m2. This means the system uses a quarter of the electricity required by the electrical underfloor heating.

It is worth noting that the thermal store losses are only 1°C per 24 hours.

In the end, everything came together well, and the client was “over the moon” with the end-result.


Click here to read the September 2018 issue of RACA Journal


 

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