Refrigeration efficiency

Why refrigeration efficiency matters

For Australian grapegrowers, winemakers and winery managers, refrigeration is much more than a utility cost. Temperature management directly influences fruit quality, wine style, production efficiency and operating costs.

Refrigeration is typically the largest consumer of electricity in wineries, often accounting for 50% to 70% of total electricity use. As energy costs continue to rise and sustainability becomes an increasingly important focus for the sector, improving refrigeration efficiency can help businesses reduce operating costs, lower emissions and maintain wine quality.

Refrigeration supports critical production processes including:

• Must cooling
• Juice clarification
• Fermentation temperature control
• Cold stabilisation
• Wine storage
• Barrel hall and warehouse cooling

Each of these processes affects wine quality and consistency. Efficient refrigeration allows businesses to achieve production objectives while using less energy and reducing costs.

What refrigeration efficiency means in practice

Refrigeration efficiency is about achieving the required cooling outcome while using the least possible energy.

In day-to-day winery operations this means:

• Cooling grapes, juice and wine only as much as required
• Scheduling cooling activities to take advantage of off-peak electricity tariffs
• Using the highest practical cooling temperatures
• Maintaining refrigeration equipment correctly
• Reducing unnecessary heat gain into tanks, pipes and storage areas
• Training staff to understand the cost and impact of refrigeration decisions

Small operational changes can often deliver significant savings without compromising wine quality.

Where refrigeration is used across the production cycle

In the vineyard

While refrigeration equipment is generally located in the winery, vineyard decisions can have a major influence on cooling requirements.

Examples include:

• Harvest timing
• Fruit temperature at delivery
• Harvest logistics
• Transport times from vineyard to winery

Fruit arriving at lower temperatures requires less refrigeration to achieve processing targets, reducing both energy use and production costs.

During winemaking

Winery refrigeration supports a range of production activities:

Practical opportunities to improve efficiency

Harvest grapes at night where possible

Temperature follows daily weather cycles. Grapes harvested overnight or early in the morning are often significantly cooler than fruit harvested during the day.

Benefits include:

• Reduced need for must cooling
• Lower refrigeration demand
• Lower electricity costs
• Reduced processing load during vintage

This is one of the simplest ways to reduce cooling requirements before grapes even arrive at the winery.

Review temperature settings

Not every wine, product or storage area requires the lowest possible temperature.

Consider:

• Whether wine storage temperatures can be slightly increased without impacting quality
• Whether dry goods are being stored in refrigerated spaces unnecessarily
• Whether cooling set points reflect current production requirements

Establishing clear temperature protocols can help ensure refrigeration is only used where it provides a measurable benefit.

Shift cooling to off-peak periods

Many electricity providers offer lower overnight tariffs.

Cooling wine during the night rather than during the day can:

• Reduce electricity costs
• Lower peak demand charges
• Improve refrigeration efficiency because ambient temperatures are lower

Well-insulated tanks often allow wineries to maintain temperature targets while shifting much of the cooling load to overnight periods.

Use warmer brine temperatures when practical

Many wineries operate with brine temperatures lower than necessary for routine cooling activities.

Where wine style and process requirements allow, warmer brine temperatures can:

• Improve refrigeration system efficiency
• Reduce electricity consumption
• Maintain effective fermentation and storage control

Very low temperatures remain necessary for activities such as traditional cold stabilisation, but many routine cooling applications can be achieved using warmer brine.

Optimise scheduling

Efficient refrigeration is often a planning challenge rather than an equipment challenge.

Examples include:

• Grouping cold stabilisation activities into defined periods
• Scheduling processing activities to avoid overlapping peak cooling loads
• Staggering high-demand cooling operations

Better scheduling can reduce the amount of time refrigeration systems need to operate at their most energy-intensive settings.

Recover cooling and heating energy

Some wineries can capture heat rejected from refrigeration systems and use it elsewhere on site.

Potential applications include:

• Water pre-heating
• Cleaning operations
• Facility services

Energy recovery opportunities should be evaluated alongside overall refrigeration performance to ensure they deliver a net benefit.

Maintenance matters

Even a well-designed refrigeration system can become inefficient if it is not maintained.

Regular maintenance should include:

• Cleaning condensers
• Checking airflow around equipment
• Monitoring refrigerant performance
• Inspecting insulation
• Verifying control system operation
• Checking brine concentration and operating temperatures

Simple maintenance issues can significantly increase energy consumption and operating costs.

The role of insulation

Good insulation reduces unwanted heat transfer into:

• Wine tanks
• Brine pipework
• Refrigeration infrastructure

Poor insulation can lead to:

• Increased cooling demand
• Condensation
• Ice build-up
• Additional energy costs

Preventing condensation on tanks and pipes is particularly important because phase changes in water vapour transfer significant amounts of heat into cooling systems.

Sustainability and environmental considerations

Reducing refrigeration energy use can also help lower the environmental footprint of grape and wine production.

Benefits include:

• Reduced electricity consumption
• Lower greenhouse gas emissions
• Reduced refrigerant losses
• Improved sustainability performance

Choice of refrigerant can also influence environmental outcomes, with some refrigerants having significantly lower global warming potential than others.

Key takeaways for growers and winemakers

For grape growers

• Harvest during cooler periods where possible.
• Minimise delays between harvest and processing.
• Work with wineries to reduce fruit temperatures entering production.
• Consider how vineyard operations influence downstream cooling requirements.

For winemakers

• Review cooling set points regularly.
• Take advantage of off-peak cooling opportunities.
• Use the highest practical brine temperature.
• Optimise production scheduling to reduce peak cooling loads.
• Monitor refrigeration performance and maintenance.

For winery managers

• Understand refrigeration energy use and costs.
• Conduct periodic refrigeration and electricity audits.
• Invest in staff training and operational consistency.
• Consider control system upgrades and insulation improvements as part of long-term capital planning.

References and resources

Improving Winery Refrigeration Efficiency – Reference Guide