Episode 27 :: Yealands Estate utilises heat recovery
About Yealands Estate
Yealands Estate, a privately owned winery in Marlborough, has made sustainability a core business value. Using energy as efficiently as possible - including renewable alternatives - is an essential part of that.
The company's approach to energy management won it the EECA small-medium sized business award in 2009, with judges praising the sound commercial basis underpinning its work.
Yealands' energy innovations include:
- Solar-reflective, high insulation cladding on its new winery
- Recovery and recycling of heat energy from refrigeration
- Cool night air used to chill wine, reducing need for refrigeration
- Individual temperature control on winery tanks
- Motion sensors to control lighting and air-conditioning
- Installation of solar panels and wind turbines.
What is heat recovery?
‘Heat recovery' re-uses what would otherwise be wasted heat, turning it into productive energy that is used elsewhere. This reduces energy use and carbon emissions, saves money and improves productivity. It can work for any business that uses a large amount of heating or cooling. The technology isn't new - but as energy costs rise, the potential savings and benefits increase.
Where can heat recovery work?
Common sources of waste heat in business include:
- Boilers - hot gas from the exhaust of a boiler can be recovered to heat water or air Refrigeration - refrigeration systems generate low-grade heat that can be used for process and hot water heating. This is particularly apt for food processing operations
- Air compressors - over 80% of the electrical energy supplied to an air compressor is wasted as heat. This can be re-used to heat water - or even ducted directly into a room for space heating
- Waste water - where hot water is discharged as waste, it can be re-used to heat incoming water
- Gas discharges - the heat in waste gases - for example, from ovens, or incineration flares - can be recovered or even used directly elsewhere.
For more technical information, download these guides on the EECA Business website:
Heat recovery in action
Many other companies are profiting from heat recovery. View the following case studies on the EECA Business website:
- Tegel Foods Limited installed a system that recovers waste heat from ammonia refrigeration and a compressed air system
- Southern Lakes Laundries installed a heat exchanger for its main industrial washing machine - saving up to $45,000 per year
- Craggy Range reduced its electricity use by 13% and its annual CO2 emissions by 157 tonnes through heat recovery