Extended Cottage, GSHP & UFH, Norfolk
The customer owns a semi-detatched property in South Norfolk which he extended. The extension was a 2 story home improvement which linked the main property to the existing detached garage.
The property was heated with an electric boiler, with some areas of the house having a wet system with radiators. Our customer was looking for a new heating system as he wished to upgrade his existing system and include a heat supply to the new extension.
The property is off the gas grid, it was an option to consider an oil boiler, however, he was interested in a renewable source of heating.
The customer preferred to install a ground source heat pump, due to the efficiency of these pumps working at around 400%. However as there was restricted garden space available, surface ground collector pipes were unable to be used. Therefore a borehole was drilled in the driveway as the most suitable solution.
The heat pump was sited at the back of the garage, which he was planning to make improvements and build a workbench in the garage, therefore the engineers took this into consideration and brought the pipework from the bore hole to the heat pump through the roof of the garage, to ensure this did not disrupt the workbench area which was to be built.
The extension had already been built when the 1st work for the ground source heat pump needed to commence, which meant careful consideration needed to be given to the design of the pipework linking the borehole to the heat pump and the house effectively. The bore hole was drilled then once the scaffolding to the property was removed the connecting pipework was able to be completed.
There were two options which could be considered for hot water in this situation one being a hot return pump, however the disadvantage to this option would have been the delay to the hot water draw-off to the existing bathroom which could have resulted in a 5 minute delay of hot water. In addition to being extremely energy inefficient. The second solution which was recommended, was to use low loss pipe through the garden, to link the house and the garage. This was the most direct route to link up the heat pump and the house, which would remove the problems of the hot water delay, providing instantaneous hot water.
The advantage of using the low loss pipe was to avoid any delay on hot water draw off when using hot water within the house, this therefore ensured maximum comfort and efficiency to the whole household.
R A Brown fitted underfloor heating to the ground and 1st floor extension part of the building and linked the existing property heating, all on to one system. One of the advantages of underfloor heating is the way it optimises the efficiency of heat pumps by delivering a constant controlled heat which can help reduce running costs and your carbon footprint.