All Kensa ground source heat pumps can be manufactured to provide active cooling for a building. Uniquely, Kensa also offers passive cooling solutions to provide ultra-low cost cooling in the summer, whilst re-charging the ground for a more energy efficient ground source heating system.
Ambient Benefits of Ground Source Heat Pumps
Warmer summers, penchants for glazed exteriors, and improvements in insulation standards and airtightness are placing increasing pressures on the need for cooling of both domestic and commercial buildings.
In many modern commercial buildings, the requirement for cooling is now almost as great (if not greater) than the requirement for heating.
Due to the ambient temperature of a ground source heat pump’s pipe distribution system a ground source heat pump system avoids the common issue of overheating caused by traditional central plant heat networks or district heating.
The distribution system can also uniquely bypass the ground source heat pump and utilise the cooler ‘source’ temperature of the ground compared to internal building temperatures, to deliver a degree of 'free' or passive cooling, whilst helping to improve the overall efficiency of the system, and lower the installation costs (read Kensa’s blog ‘Overheating & Passive Cooling: The Ambient Benefits of GSHPs’).
For applications requiring year round cooling, then Kensa ground source heat pumps can be operated in active cooling reverse-cycle mode to deliver temperatures of 7°C – 12°C.
When operating in a reverse-cycle mode, Kensa ground source heat pumps provide active cooling by generating chilled water (typically at 6°C to 12°C) to cool a building, operating in a similar manner to a chiller.
When connected to ambient shared ground loop arrays, cooling optimized ground source heat pumps have the added benefit of using the waste heat to re-charge the ground array to improve the overall efficiency of the system rather than just throwing it away.
For a ground source heat pump to actively cool, Kensa makes these modifications at the time of manufacture.
Recommended Active Cooling Applications
Active cooling with Kensa ground source heat pumps is particularly commonplace in large commercial applications.
Kensa’s modular Commercial Plant Room Ground Source Heat Pump Series enables the system to match any required cooling load.
Kensa’s Twin Compact Ground Source Heat Pump Series provides the option of having cooling on one compressor and heating on the second compressor.Discover the Plant Room Series
Cascaded Heating & Cooling Systems
With multiple units it is possible to provide heating and cooling to different parts of the building simultaneously.
Utilising Kensa’s Cascaded System Architecture, dedicated ground source heat pumps could be cascaded to efficiently deliver fluctuating heating and cooling requirements to different circuits, effectively forming a series of cascaded systems, in one system.Read About Cascaded Heat Pumps
Passive or ‘free’ cooling with a ground source heat pump is a unique benefit to our technology.
The cool temperature of the ground compared to building internal temperatures in summer allows for passive cooling to be provided.
Passive cooling uses the low temperature of the ground loop to cool the property via a fan coil, passive beams or an underfloor cooling system.
This is simply achieved by passing the contents of the cooling system through a plate heat exchanger with the ground array fluid passing through the other side.
This system completely bypasses the ground source heat pump, and so the only running cost is for the circulating pump and the distribution fan, estimated around £20 per year, which is a fraction of the cost of air conditioning.
The coolest bit about passive cooling is that any energy taken out of the building during the cooling process helps to recharge the ground array; this will increase the efficiency of the heat pump when providing hot water through the summer, and also store enough energy in the ground to improve the efficiency of the heat pump when heating the building the following winter.
Recommended Passive Cooling Applications
As buildings become increasingly airtight and well insulated, and with climate change making hotter summers more likely, the need for cooling in new build developments is increasing.
Shared ground loops could therefore offer significant benefits over and above providing the lowest cost of heating – especially in highly glazed flats.
Kensa's Passive Cooling Module
Passive cooling works in individual properties, or communal areas within blocks of flats, but gets really interesting when scaling up to larger shared ground loop district schemes connecting multiple buildings with a mix of dwellings and commercial buildings.
The benefit of balancing the heating and cooling loads can offer the opportunity of not only efficiency improvements, but also reducing the capital cost of the ground array as the balanced load means borehole depths can be reduced.Download Fact Sheet
Passive Cooling & Shared Ground Loops
Kensa’s Passive Cooling module and Control Centre links with all Kensa ground source heat pumps to provide the components for a cost effective cooling system.
The Kensa Shoebox Ground Source Heat Pump, connected to an ambient shared ground loop array, fitted with the Kensa passive cooling module, provides a one-stop-shop efficient heating and cooling solution for clusters of multiple buildings and flats.
The Kensa Passive Cooling Module can be retrofitted to Kensa ground source heat pump systems.
The summer of 2018 ranks as one of the hottest on record. We are not complaining, it’s been lovely, but overheating is certainly an issue that needs to be faced when looking at the design of multiple occupancy buildings.
Passive Cooling Module Factsheet Version 2
Cooling Distribution (FS) V2 Factsheet Version 2
Commercial Plant Heating and Cooling Application Information Sheet Version 2
Current & Electrical Inputs in Cooling Mode Fact Sheet Version 1