Maintain, downsize and turn off your fridge
Refrigerators and cool rooms consume a lot of energy. The benefit of bringing them up to best practice efficiency is a heavy financial and environmental reward.
Fridges require large amounts of power, and for those businesses with significant refrigeration needs this can be an expensive ongoing cost. However, energy savings of 20% can generally be obtained from regular maintenance and prudent use of refrigerators.
In certain industries, refrigeration can be responsible for up to 85% of total energy consumption, depending on the industry sector: Liquid milk processing 25%; Breweries 35%; Confectionery 40%; Chilled ready meals 50%; Frozen food 60%; Cold storage 85%. (Energy Efficiency Best Practice Guide - Industrial Refrigeration by Sustainability Victoria).
So tune up your fridges and save money today.
How to do it now!
For many shops, restaurants, and service businesses, refrigeration is a large component of their energy bill. The following tips will ensure your refrigeration system is running at it’s most efficient:
Replace poor fridge door seals.
Age and use can cause fridge door seals to decay and let the cold air out. A poor fridge door seal results in the refrigerator having to work harder (i.e. consume more power) to maintain the level of cold it is set for. Door seals are usually available from the fridge manufacturers and hardware stores, and can be replaced by yourself or by a refrigeration service technician.
Ensure your refrigeration unit or cool room, is regularly maintained.
Like any piece of machinery, fridges work most efficiently when maintained. A general maintenance service every six months by a qualified technician should include:
- checking to ensure door seals are functioning efficiently;
- cleaning compressor fans to ensure they are free of dust. Use a vacuum or broom to remove dust build up;
- removing scaling and ice build-up on evaporator fins;
- servicing and lubricating compressor units; and
- ensuring control settings remain at optimum levels (i.e. temperature settings). Set fridge thermostats to 3°C in summer and 5°C in winter. Set freezer thermostats to -18°C in summer and -15°C in winter. Every degree lower than this will add 3% to running costs.
If your business uses a significant amount of refrigeration, it would be helpful to complete a comprehensive audit of the refrigeration system’s efficiency by engaging a specialist to assist. The Best practice Refrigeration manual explores some of the optimisation options available in larger commercial refrigeration systems.
Align your refrigeration size to your needs.
Ensure each fridge is 2/3 full at all times and turn off any refrigeration units that are idle. If your ongoing needs are smaller than the fridge you have, consider downsizing you refrigerator with a more efficient model. A range of energy saving fridges can be found on the E3 Equipment Energy Efficiency site.
If you are getting rid of your old fridge consider donating it to a charity:
- Phoenix Fridges – this Brotherhood of St Laurence initiative collects fridges in Melbourne, repairs and refurbishes them and sells them from their community stores to low-income families.
Install a 24-hour timer on drinks fridges.
Most fridges take approximately 30 minutes to cool down to their set temperature, so fridges with non-perishables (i.e. soft drinks, beer) can be auto switched off at night and on the weekend to save approximately $300 p.a. Timers are available from hardware stores and electronics suppliers and are easily set up.
Position your fridge away from sunlight and heat.
Refrigerators work best in cool positions with plenty of air circulation.
Cover coolroom doorways.
Install plastic strips on coolroom doorways to maintain internal temperature when the doors are opened and closed.
How much will it save?
On a domestic scale,an inefficient one star fridge (single door 300-400 litres) over a 10 year life span, will consume $250 more power than a three star equivalent. A badly maintained one star fridge would consume an additional 20% power and cost a further $140. At the commercial scale the cost of these inefficiencies increases dramatically.
How did we calculate this?
According to the Carbon Trust, cost savings of 20% or more can be achieved by ensuring that the refrigeration system/plant is well operated and maintained. The above calculations are based on a the Refrigeration database tool on the E3 Equipment Energy Efficiency site.
Cost to implement
It is recommended that refrigerators are maintained every six months, and maintenance can take just 30 minutes to complete. Fridge seals can cost around $60 to replace. The cost of purchasing a higher star rated fridge varies but can be offset by purchasing a slightly smaller unit and adjusting the cooling volumes of non-perishables.
- Refrigeration System - Guide to key energy saving opportunities (Carbon Trust - UK)
- Best Practice Refrigeration manual (Resource Smart - VIC)
- How to avoid refrigerator repairs (The Family Handyman - USA)
Why is this action important?
A refrigerator is a power hungry appliance that can be maintained and used more efficiently to deliver easy energy efficiency gains. This reduces energy use and the associated costs, both financial and environmental.
For businesses using several fridges or a cool room, these benefits can be significant. By approaching best practice in our industries we can better compete, and increase profits.