When property developer, Sir Mark Wrightson, planned the transformation of dilapidated farm buildings into luxury residential accommodation, environmental and financial concerns were an important priority. Keen to keep the property’s carbon footprint low, Wrightson sought an efficient alternative heating system to oil.
Viessmann installation partner, Parsec Consulting Engineers Ltd, designed and installed a heat pump system, with electrical heater support on demand. The system generates a total energy saving of 17,345 kWh per year (75 percent less than a comparative oil system), and estimated annual savings of £980.
Reliable energy, whatever the weather
Parsec Consulting Engineers Ltd specified and installed a heat pump system to provide the property with heating and hot water. Available space surrounding the barns was limited, so project manager Shaun Ackerley carried out detailed calculations to ensure the heat pump’s collectors would be large enough to draw sufficient heat from the ground, whilst avoiding obstacles such as external drains and foundations. This careful loop field arrangement avoided the need to access the heat source via the borehole method.
A Vitocal 242-G heat pump supplies warm water to under-floor heating systems throughout the property, whilst a Vitocell 220-litre buffer cylinder stores hot water for when it’s needed. A Viessmann inline electrical heater supports the heat pump when outdoor temperatures are especially low.
As part of fitting the heating equipment, Parsec Consulting Engineers Ltd installed a Vitotrol 200 system control to manage and integrate each element of the system. The controls are fully integrated into the heat pump unit, and govern when support from the electric heater is required. The customer can be sure there is always sufficient heat energy available, whatever the weather.
Savings approaching £1,000 per year
The heating system is now harvesting 23,127 kWh of free energy from the ground every year. Compared to an oil-fired boiler, the installed system is using 75 percent less energy to run, the equivalent of £980 per year. Support from the domestic Renewable Heat Incentive is expected to provide an additional £1,200 per year when it comes into effect, which would see the installation costs recouped within seven years.
“This was the first time Sir Mark had considered ground-coupled heating technology. A positive experience would make him more likely to consider similar installations for future luxury developments, so designing a system which would deliver significant savings was paramount,” says Shaun Ackerley, managing director of Parsec Consulting Engineers.
“We are seeing an increasing number of clients wanting to reduce energy consumption with renewables. But, many are still unsure of how the technologies actually work and are operated. Detailed, comprehensive handovers of renewables systems to end users are vital if installations such as these are ever going to grow in number.”