On-Farm Heat Pumps

Lower Costs and Secure a 20-Year Income Stream

Air and ground source heat pumps attract substantial Renewable Heat Incentive (RHI) payments, and outstanding efficiencies mean significant fuel savings. They are an ideal heating solution for many farm buildings and applications, either replacing or working alongside existing heating systems. Properly specified and installed, your heat pump can provide clean, low-cost heat, a payback period under 3 years and a significant new revenue stream for 20 years.

 

Case Study 1: Dairy Farm With 70kW Ashp To Preheat Water And Offset Electric

Dairy Cows enjoying heat from ASHP

This dairy farm used direct electric heating for its hot water systems. By installing an air source heat pump (ASHP) to feed a heat exchanger, on the water intake, the direct electrical load is displaced by the ASHP, which is 2.7x more efficient and provides 2/3 of the heat needed. In addition to substantial electricity savings, the ASHP attracts significant RHI which combined gives the project a payback of under 3 years.

Table showing ASHP financials on dairy farm

 

Case Study 2: Diversified Farm Buildings With 140kW ASHP Supplementing Oil

large air source heat pump

The farm has converted a range of traditional farm buildings into business units, heated from a central oil boiler. By installing an ASHP operating in tandem with the existing oil boiler, more than half the heat requirement is met by the heat pump with the balance served by the oil boiler. Adding an ASHP to the existing system, instead of replacing, gives a 65% reduction in carbon, while minimising disruption and capital costs. The addition of the RHI to the reduction in oil fuel costs, gives a payback under 5 years.

ASHP financials

 

Case Study 3: Single 100kW GSHP Replacing Farm Oil Boilers

100kW Ground Source Heat Pump

The farmhouse, several office buildings, a workshop and a farm worker's cottage are currently each heated by separate oil boilers. These are all replaced by a single GSHP, which feeds heat to all the buildings. This gives a 40% reduction in the fuel cost of the heating, a 70% reduction in carbon and a 7-year payback on the investment in the new heating system, even before taking account of the avoided cost of replacing the elderly oil boilers.

Financial table for 100kW GSHP

 

Case Study 4: 200kW GSHP With Biomass Boiler

Chip being replaced by GSHP

The business case for a farm biomass boiler seemed compelling 5 years ago but since then the cost of wood chip has risen significantly and the operation of the boiler is more labour intensive than anticipated. By installing a GSHP running in parallel with the biomass boiler, the woodchip consumption is less than a quarter of current usage and the system now only needs to be run for a few months each year. This provides significant savings in the operation and maintenance costs, while the RHI and direct fuel savings combine to give a payback in under 8 years.

200kW GSHP financials

How Heat Pumps Work

Air Source Heat Pumps (ASHP) are a popular and cost-effective option for many homes. You already have a heat pump in your home – your fridge. It absorbs heat from inside the fridge and expels it to the exterior of the unit. An ASHP uses the same technology but runs in reverse, taking heat from the outside air, concentrating that energy and using it to provide space heating and hot water inside your home.

Diagram of air source heat pump with solar panels

  • Ambient air is pulled into evaporator by electric fan

  • Air heats liquid refrigerant in the evaporator, changing it from liquid to gas

  • This gas is compressed by electric compressor, significantly increasing temperature

  • Hot gas passed through a condenser, transferring heat to water to be used in the home

  • Gas passes through expansion valve to cool and start process again

 

Ground Source Heat Pumps (GSHP)

Ground source heat pumps utilise a very similar process to air source heat pumps but collect heat from the ground instead of the air. The ground absorbs solar energy from sunlight and rain. In the UK, the ground absorbs enough solar energy to maintain a year-round temperature of around 8-12 °C.

  • Water/antifreeze mix pumped through ground in heat absorbing ground array pipes

  • Ambient heat flows from warmer ground into cooler liquid, warming liquid to ground temperature

  • Heat exchanger transfers this heat to refrigerant, which boils and turns into gas

  • Compressor increases gas pressure, greatly increasing temperature

  • Heated gas flows into condenser, transferring heat to water for space heating and domestic hot water

  • Gas cools, returns to liquid and passes through expansion valve for process to start again

End-to-End Service

Locogen offers a complete, end-to-end service, from initial concept right through to system handover and maintenance. With 100s of successful installations since 2004, our proven processes ensure success. We will tailor our service offering to your specific project, ensuring the most streamlined and economical process but our full range of services incudes:

Energy Audits

  • SAP calculations

  • U value calculations

  • Thermal bridging analysis

  • New build dwelling Energy Performance Certificates (SAP)

  • Existing dwelling Energy Performance Certificates (rdSAP)

Specification & Design

  • Concept/ Feasibility with Budget Costings

  • Planning applications / input

  • Building Warrant applications / input

  • Liaise with local authorities and other contractors

  • Detailed drawings and specification with bill of quantities for direct purchase/ pricing

  • prepare tenders and manage process

Commissioning & Verification

  • Inspect work on site if needed

  • Commissioning

  • Certification if required

Next Steps

Each site is unique. Contact us and we'll discuss the particulars of your site, review your options and provide a tailored quotation.