In summer 2017, Freshfield Energy consulted Infinitas on the Renewable Heating Incentive (RHI) eligibility for a waste heat recovery heat pump and biogas CHP system on the Hendwr Farm. The project aimed to utilise some of the waste heat from the slurry discharged from the anaerobic digester on its way to the slurry lagoon within the heat pump.

However, our engineers were facing a challenge. The heat was leaving the digester at a temperature more significant than the heat pump could accept so that the system couldn’t be used directly.

Infinitas worked with the client and their M&E contractor to design a heat exchanger to solve the issue. This way, we reduced the temperature of the slurry to a level that was acceptable for the heat pump. At the same time, our team retained the high efficiencies of the system, achieved by using a relatively high temperature into the heat pump.

What was the outcome of our efforts? Combining this solution with naturally occurring heat from a ground loop attached to the heat pump made the system eligible for non-domestic RHI. Alongside the heat pump system, the scope of work also included a biogas CHP engine, which used the biogas generated by the digester.

Oil boilers were replaced by a heat pump, generating heating for three properties on the farm site. On top of that, we expect the heat pump efficiencies to exceed 420% due to the intelligent waste heat usage in conjunction with the water from the ground loop. In the end, we gained another happy customer.

Are you still not sure if Infinitas is the right partner to help you with the heat pump aspect of your scope of work? Look at our Testimonials section to see what our clients say about working with us.