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Minimising the heat gains on refrigerated cabinets and cold rooms cuts the cooling load on your refrigeration system and saves you energy and money.

Any energy efficiency initiative dealing with refrigeration should start by reviewing the heat gains on your system.  If you understand the nature of these gains, you’ll be able to manage the amount of cooling that needs to be done and make energy savings. Heat gains include warm air entering the cabinet or cold room and heat produced by electrical equipment within the cooled space.

This guide covers in detail two opportunities to reduce heat gains: reducing cold air changes using strip curtains, and using EC (electronically commutated) replacement motors for evaporator fans.

The business case - You will find opportunities for reducing heat gains on refrigerated cabinets and cold rooms in most applications.  Improving door management in cold rooms results in substantial energy savings. For example, installing plastic strip curtains to a cold room can give savings of up to 30%, and have a payback period of around a year.

Replacing conventional shaded-pole fan motors with equivalent EC motors can cut their energy use by 65%, as well as generating less heat and reducing your maintenance replacements.  You can maximise the saving achieved by fitting a whole new fan assembly instead of just replacing the motor. In most applications the payback period for fitting EC motor fans is one to two years, but it can be much shorter.

How to reduce heat gain in refrigeration (CTL137)- Click to view

Further information on the Carbon Trust guidance documents can be found by clicking here.

Reducing the heat load on your existing large refrigeration systems can save energy and cut your running costs. It can also reduce the capital cost of a new plant and even eliminate the need to invest in a new plant altogether.

This guide is aimed at users of existing large refrigeration systems such as those in supermarkets, central air conditioning systems, large cold stores and large industrial processes. It will help you to minimise your cooling needs and to meet them as efficiently as possible using the most suitable refrigeration system.  Both of these will result in energy savings.

Before you start any refrigeration energy efficiency initiative it is vital to review the heat loads on your cooling plant. If you understand the nature of your loads you can make sure they are met while at the same time minimising the energy cost of your refrigeration systems.

The business case - There are opportunities to reduce the heat load on refrigeration systems at almost all sites.  Savings and costs will vary depending on the type of opportunity.  Often payback periods are less than one year, and sometimes even no-cost heat load reductions are possible.

If you are planning to install a new plant, reducing its heat load could reduce the capital cost. If your existing refrigeration system currently struggles to supply enough cooling, reducing the heat load on your system could avoid the need for an expensive new plant altogether.

How to reduce heat load in refrigeration (CTL138) – Click to view

Further information on the Carbon Trust guidance documents click here.