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Investing in commercial energy efficient refrigeration has two main attractive outcomes. The first is the cost savings that are involved with lower energy consumption. The other is the smaller impact there is on the environment and our world at large. A more eco-friendly fridge is designed to minimise energy consumption, and, as such, it minimised unnecessary wastage.

Variable Speed Drive
Maintenance & Replacement
Old Units vs New Units
Savings Calculator
Potential Savings Table
Optimisation Tips

 

 

Savings Calculator

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Select which energy-saving additions to apply

See your potential energy savings

See your potential cost savings

Number of fridge units: 3

Your energy cost per year per unit:

$

Replacement fridge cost per unit:

$
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Energy Savings:

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per year
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per year
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reduction
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...years until paid off by savings

* This calculator is only a rough estimate of potential savings and is for illustrative purposes only. Among other things, it assumes the energy reduction add-ons are not already in place.

For a breakdown of the information used see the Potential Savings Table.

Variable Speed Drive

Put simply, a variable speed drive (VSD) makes sure that the energy used in the commercial refrigeration system is matched to the refrigerator’s load. Rather than running at full capacity all the time, a system with a VSD will only use the required energy, greatly reducing running costs and boosting efficiency. This applies to stainless steel refrigeration, glass display refrigerators, storefront fridges, and more.

If the refrigeration system is running at or close to full capacity for most of the time then a VSD will not improve energy efficiency. However, for a system that runs at least 2000 hours per year and has variable load requirements, a VSD is the preferred option in terms of energy efficiency1.

Maintenance & Replacement

Keeping a piece of machinery in good repair is a sure-fire way to reduce any unnecessary running costs, especially for a restaurant, café, or any other commercial kitchen fitout. A machine that has to do more work because of a build-up of contaminants, or running without an appropriate amount of fluid, or because the condenser wasn’t cleaned will run at a higher energy usage than a well maintained counterpart. Making sure your refrigerator is in good working order will extend the lifetime, lower the running cost, and will guard against any unforseen breakdowns or future issues.

However, even a well maintained machine will slowly succumb to the day-to-day effect of continual usage. A refrigeration system that is older than 10-years is typically inefficient, and replacing the system may increase efficiency by up to 30-40%2. Regular monitoring and testing will help avoid letting the efficiency sink this low as well as help identify future problems.

Old Units vs New Units

An old system may have:

  • • Worn or poorly insulated coolant pipes allowing the system to gain heat resulting in higher energy consumption and the potential spoilage of products.
  • • A growing difference between evaporating and condensing temperatures can reduce energy efficiency. A “1°C reduction in temperature lift can improve plant efficiency by 3–4%”3.
  • • A system that has grown any hot-spots will lose effectiveness of the fan and pump motors.

A new system can have:

  • • Variable-speed fans can be installed on the compressor and setup to minimise head pressure while using minimal energy rather than running at a continual speed. Reduced head pressure lowers energy consumption4.
  • • Rather than a VSD, the cooling load can be efficiently split up between smaller compressors that are configured in a way that minimises energy usage when running on a partial-load operation.
  • • Monitoring gauges can be installed to easily identify problems and help in maintaining the system.

Potential Savings Table

MethodPotential Energy Savings
Use of electronic expansion valves20%
VSD on motors20%
VSD on evaporator and condenser fans2–3% of total refrigeration costs
Evaporator pressure regulators2.5% greater compressor capacity for each degree of saturated suction temperature
Evaporator pressure regulators2% for each degree increase in saturated suction temperature
Reduced temperature lift3–4% improvement for 1°C reduction
Conversion from liquid injection oil cooling to external oil coolersOver 3%
Refrigeration system replacement if older than 10 yearsUp to 30–40%
Refrigerant selection3–10%

Savings are not necessarily cumulative. Information sourced from Sustainability Victoria5.

Optimisation Tips

  • Inspect your coolant pipe insulation for moisture; a formation of ice can damage the insulation and reduce efficiency of the system.
  • Check you’re using the most appropriate coolant for your specific commercial kitchen fitout.
  • Look for any spots in your system that may be affected by the environment. Outside sources of heat means more work for the commercial refrigerator system.
  • Use the exhausted heat from the system for pre-heating water pipes and other uses. Rather than wasting the unwanted heat from the refrigeration system, it can be repurposed to improve the whole kitchen efficiency.
  • Check your seals are intact and aren’t leaking in any heat from outside of the refrigerator.
  • Make sure the unit hasn’t been knocked around and has been bumped out of level. Keeping the fridge properly upright makes sure all the seals are properly aligned and working correctly.
  • Assure that your fridge unit has appropriate room for external ventilation. A building up of heat will reduce the fridge’s effectiveness.
  • Clean your condenser weekly!

References

 

1 Sustainability Victoria, Energy Efficiency Best Practice Guide to Industrial Refrigeration (2009), State Government Victoria: p.11 <LINK>

2 Ibid, p.15

3 Ibid, p.14

4 Ibid, p.13

5 Ibid, p.22 [Table 9]

 

 

 

 

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