Estimating Energy Loss Through Open Doors

While not an exact science, there is a recognised method for estimating energy loss through open doors using the following formula:

Q = (A × U × ΔT × t) / 1000

• Q: Energy lost (in kWh)
• A: Area of the door (in m²)
• U: Thermal transmittance value (in W/m²K)
• ΔT: Temperature difference between internal and external environments (in °C)
• t: Duration the door remains open (in hours)

Depending on the values of these variables, energy losses can range from hundreds to thousands of kilowatt-hours per year for a single building. This can result in significant financial implications, especially for industrial and commercial premises.

Measures to Reduce Energy Loss and Heating Costs

1. Install High-Speed or Automatic Doors
   • High-Speed Doors: These minimise the amount of time doors remain open, significantly reducing heat loss. Our High-Speed Door range offers multiple configurations to suit a variety of requirements.
   • Automatic Doors: Help ensure that doors close immediately when not in use, reducing unnecessary exposure.
2. Use Air CurtainsAir curtains create an invisible air barrier that reduces the exchange of indoor and outdoor air. This is particularly effective in high-traffic areas. Our Enershield Air Barriers are designed to deliver this benefit efficiently.
3. Improve Door InsulationUpgrading door insulation can reduce thermal transfer, particularly important in older buildings or those with frequent exposure to external temperatures.
4. Install Dock Seals or SheltersFor loading bays, dock seals or shelters close gaps between the building and vehicles, helping to retain heat. We offer a wide range of loading bay equipment to support these improvements.
5. Employee AwarenessTraining staff to be mindful of open doors and to use automated systems correctly can lead to noticeable energy savings through behavioural change.
6. Regular MaintenanceEnsuring that all doors, seals, and associated systems are well-maintained helps prevent avoidable heat loss. This is often one of the most cost-effective methods of reducing energy waste. Our nationwide service team operates 365 days a year, providing expert maintenance and repairs across a wide range of industrial door systems.

Potential Savings

By implementing these measures, it is possible to reduce heating energy consumption by 10–20% or more, depending on current inefficiencies. For large facilities, this can equate to annual savings in the tens of thousands of pounds.

Take Action Before Winter

Addressing energy loss now can help reduce heating bills and improve environmental efficiency before colder temperatures set in. Contact Arrow to discuss how we can support you with maintenance services or product selection to meet your specific needs:

arrow-industrial.co.uk