Welcome to Kensa Heat Pumps

Yorkshire Heat Pumps are fully accredited heat pump installers working in partnership with Kensa heat pumps to provide clients with a single point of contact for their heat pump installation.

Established in 1999, Kensa Engineering Limited is the country’s only manufacturer of a full range of ground source heat pumps designed for both residential and large scale commercial applications.

Kensa ground source heat pumps are supplied via distribution and installation partners. Yorkshire Heat Pumps are Yorkshires largest supplier of Kensa ground source heat pumps.

Features and Benefits of Kensa Heat Pumps

• Uk Manufacture
• Complete range of MCS approved ground source heat pumps
• Single phase units up to 24kW
• Modular plantroom units up to 75kW
• Heating and cooling options available
• Domestic hot water production optional
• Straight forward controls and integration
• MCS approved installations

How Kensa Heat Pumps Work

There are three elements to the heat pump system:
• The ground array which is used to extract energy from the land surrounding the property.
• The heat pump which is used to concentrate and transfer the energy.
• The heat distribution system which distributes the heat within the building.

A liquid (typically a water/antifreeze mix called brine) is circulated into the ground array using an electric pump fitted within the Kensa compact heat pump. Since the ground surrounding the Slinky pipework is around 8 – 12°C, the liquid increases in temperature and returns to the heat pump several degrees warmer.

The energy stored in the warmed liquid is transferred, via a heat exchanger, into a refrigerant which is stored in a sealed circuit within the heat pump. As the refrigerant absorbs the heat, it evaporates into a gas which is passed into an electrically-driven compressor. The compressor increases the pressure of the gas and is then fed into a second heat exchanger and transfers its heat into the water within the heat distribution system. The final stage sees the cooled gas transform back into a liquid ready for the cycle to repeat.

Kensa Heat Pumps Energy Sources

Slinkies are the most cost effective way of installing ground arrays as they reduce the amount of digging required. Slinkies are a length of coiled plastic pipe buried in the ground which can be installed on their vertical edge or horizontally.

Straight pipe can also be used, however this can increase the amount of digging by up to 5 times and hense the cost of installation. There is no difference in the amount of ground required as the energy source for slinkies or straight pipe and both have the same performance. Boreholes

If there is insufficient are to install slinkies or straight pipe then an alternative is to drill vertically down. Borehole tend to be 60-100m deep and consist of a single pipe inserted within the borehole, which is then backfilled with thermal grout. The depth and number of boreholes will vary depending on the ground and size of heat pump. Lakes

If the property is next to a lake then it is possible to use the lake water as the energy source. This is generally the most cost effective means of installing arrays as digging is kept to a minimum.

The most popular lake system is a closed loop system. In this system a food grade glycol and water mix is circulated around the slinkies, which are sunk to the bottom of the lake. The slinkies are attached to a frame and will absorb energy from the surrounding water. The lake has to be sufficiently deep to avoid freezing around the slinky.