GreenACT Case Study Three Renewable Technologies Working Together

Experts in Renewable Energy, Design & Installation

Case study - Avondale

Three Renewable Technologies Working Together Project Overview When planning a major re-build of his current home, Rev. lain Rennie wanted to “do his bit” towards reducing C02 emissions, whilst keeping his utility bills to a minimum during his retirement.

Client

Iain Rennie

Location Rugby Sector

Domestic Retrofit

Project Details

Challenges and requirements Previously, the heating and hot water in Rev. Rennie’s 1940s, three bedroom property, had been provided by an oil-fired boiler. As the re-build had made the dwelling substantially bigger, it required a completely new system to meet heating demands.

What we did Due to its low operating costs and high coefficient of performance, GreenACT installed a Viessmann three-phase Vitocal 300-G ground source heat pump system. The heat pump supplies warm water to 19 under-floor heating circuits throughout the property, whilst a Vitocell 200-litre buffer cylinder

Waverley House, 70 Binswood Avenue, Leamington Spa, CV32 5RY

3

Feasibility Assessment Energy & Sustainability Statement / Planning Application

3

Ground Source Heat Pump Air Source Heat Pump

3

Solar Thermal - hot water

3

Solar PV - electricity

3

Underfloor Heating / Room Heating

3

Grant / Incentive Scheme Support

08455 33 32 31

hello@GreenACT.co.uk

panels are also generating over 3,200 kWh of free electricity, with the solar thermal and solar PV systems working together to reduce C02 production by 3 tonnes per year.

ensures there is always a reserve available to cope with any sudden demand for heat.

At very low outdoor temperatures, the heat pump is supported by an auxiliary in-line electric heater. For the majority of the year, this also helps the heat pump operate at its peak efficiency. It works hand-in hand with weather-compensated controls, which tailor the output of the heat pump to the outdoor temperature, reducing the waste of redundant heat and the associated cost to the homeowner.

Compared to an oil-fired boiler, the installed system is costing 45 percent less to run, the equivalent of £972 per year. Without any incentive payments, the installation costs would be recouped in around 20 years, but support from the domestic Renewable Heat Incentive could reduce this by half when introduced.

When the Sun’s shining, the integrated control system suppresses the heat pump and instead collects energy from Viessmann Vitosol 200-F solar panels on the roof. This ensures hot water is always generated by the source with the lowest cost. At other times, the heat pump is brought online to top up the 300 litre cylinder which stores the home’s hot water.

Electricity is produced on-site by a 2.25 kWp (ie. peak power) solar PV system, to which a second array has since been added as more roof space became available. The harvested energy is fed back to the heat pump to further reduce its cost of operation, or back into the mains grid at times of surplus.

Benefits & outcomes The heating system is now harvesting 25,720 kWh of free energy from the ground. Solar PV

Rev. Rennie already receives Feed in Tariff incentive payments for the two solar PV arrays, and the government’s Renewable Heat Premium Payment has already paid £1,250 towards the heat pump and £300 for the solar hot water installation.

“GreenACT spent a great deal of time in guiding me through various stages of installation and resolving any interactive issues that arose alongside the ongoing building works”

“GreenAct, particularly through Peter, spent a great deal of time in guiding me through various stages of installation,” says Rennie.

“I received good attention and service and felt completely confident in their knowledge of renewable technology and in the quality and reliability of products.

As a result, I now regard Peter as a friend rather than just a business acquaintance.”

This project has been nominated for three separate national awards in 2013.

GreenACT Ltd Waverley House, 70 Binswood Avenue, Leamington Spa, CV32 5RY Company registered in England 6867210

For more information please contact us:

Tel: 08455 33 32 31 or Email: hello@GreenACT.co.uk

Please visit: www.greenact.co.uk