West Ancroft Farm

Heatpump Grain Dryer generates over £2,609,251* of income and savings with the 20 year Government Tariff

Calibrate exceeded expectations by having our Heatpump Grain Dryer installed in 9½ weeks ready for the 2018 Harvest. I would happily recommend them for a customised solution.

 Ian Douglas

Intelligent Hands Off Heatpump Systems

The Introduction.

W L Douglas and Sons are based near Berwick-upon-Tweed in North Northumberland. This business has seen rapid growth in the last several years resulting in a Grain Drying requirement of some 25,000 tonnes. Partner Ian Douglas approached the Calibrate Energy Engineering team to look at ways they could speed up and streamline their Grain Drying and cooling process. It was agreed that Calibrate’s 1mW Heatpump HeatChill system seemed like the perfect fit for their 40t/hr Continuous Grain Drying system. A bespoke Control System remotely manages this system enabling The Douglas’ to have a ‘hands off’ approach as well as enabling real time tariff generation and power consumption readings.

The Process.

Having 22 years of industrial refrigeration experience in the chilling sector, and 12 years as a Heatpump Business owner, the Calibrate Technical Director Shane McDonald put together an outline plan to pre-heat the air onto the burners to 45°c, whilst also using the free chilling to bring the grain 8-12°c below ambient prior to storage. This worked to reduce fossil fuel usage, derive a high 20 year RHI tariff and also sped up the throughput by chilling the grain after drying. With the further benefit of little, or no mechanical ventilation within the storage sheds afterwards.

The Figures.

  • £2,609,25 of income and savings generated with the 20 year Government Tariff
  • A 4-5 year pay back on the 20 year scheme
  • 45-50°c at 400% heating efficiency
  • 1°c at 325% chilling efficiency
  • Total energy efficiency of 725%

The Conclusion.

This is the first site of its kind in the UK to have a Simultaneous Heating and Chilling system. Plans are being made to further utilise the 900kw of 1°c chilled water now available onsite, with ideas such as free chilled storage, free dairy milk chilling and free potato chilling as options.  A grid application has also been submitted to install a 250kW Solar system to further utilise Calibrates unique inhouse developed Export Management system to vary the power usage of the Heatpumps from 10% to 100% depending on the level of power generation available, meaning no power input cost when the sun is shining, further reducing the payback and grid reliance.

Calibrate Energy Engineering is a leading provider of intelligent ‘hands off ’ heatpump systems, designed to provide maximum energy and cost savings for commercial businesses.


Our expertise lies in harnessing the natural energy resources surrounding a building to provide clients with reliable, low-cost heating for commercial applications. We do this through an integrated Heatpump system which is both affordable and worry-free, with long term maintenance cover available for peace of mind. Our bespoke control system enables government tariffs to be maximised and the system can be easily integrated alongside other renewables

Maintenance and Extended Warranty

Calibrate understands the importance of peace of mind, we offer our clients a 20 year warranty package ensuring there are no surprises with our technology. The bespoke Control Package remotely manages the Heatpump, integrating it with other renewables if they are present and enabling a ‘hands off’ approach as well as real time tariff generation and power consumption readings.

Demand Side Response (DSR)

DSR financially incentivises energy users to increase or reduce on demand nonessential energy usage at times of peak or low demand.

Why is demand response needed?

The National Grid has to maintain a certain level of energy production capacity above actual demand. DSR is designed to provide the margin, either by increasing or decreasing site energy use.

What are the benefits of demand side response to you?

The primary business arguments for DSR are financial renumeration and sustainability. DSR not only allows businesses to avoid higher energy prices and receive renumeration during times on and off peak demand.

*All formulas and calculations are derived from industry suppliers and MCS guidelines, it is advisable to have the calculations and formulas checked by a certified mechanical engineer, and as such, Calibrate Inc. ltd (Company # 08277206) will not be held liable for any incorrect formulas or calculations or any accidental misrepresentation. **Time and seasonal variables dependant.