Researchers in Norway – working with industrial partners – have developed the world’s first heat pump producing temperatures of up to 180 degrees.
The heat pumps we use to heat our homes and domestic water operate at temperatures of between 30 and 60 degrees, but many industrial processes require much higher temperatures – and some industries require an entirely different technology.
“This new heat pump delivers exactly what they want, so it has great commercial potential,” said SINTEF researcher Michael Bantle. “This will be low-hanging fruit for industries that are aiming to reduce both greenhouse gas emissions and energy consumption.”
Industries that will benefit from heat pumps operating at these temperatures include the foodstuffs, fisheries and aquaculture, paper, oil and gas and metallurgy sectors.
The new heat pump represents the further advance of a technology initially developed for processing of dairy product at TINE, in the Norwegian city of Bergen, and enabled the company to become the world’s first zero-emissions dairy. It was the first to utilise only heat pumps for industrial heating of these products and in a temperature range of 100°C.
TINE achieves this by upgrading their excess heat to process heat temperature with a series of heat pumps and thermal storages hereby reducing its total energy consumption by up to 50 percent .
Temperatures higher than 100 degrees are normally not required in the dairy sector, and can be generated using ammonia and water as a work medium.
Since their success at TINE, the researchers have been looking into how it might be possible to produce even higher temperatures using a heat pump concept that also utilises a climate-friendly refrigeration agent.
Combining two machines into one
The project is a collaborative effort involving SINTEF, NTNU and the Norwegian compressor manufacturer Tocircle. Together they have developed a heat pump that combines SINTEF’s extensive R&D experience in the field of water and steam technology, with a rotary vane machine specially designed and built by Tocircle.
“The vane machine is a type of compressor equipped with vanes that rotates such that it changes the compressor volume with each revolution. The secret behind Tocircle’s compressor is that all its moving parts that are in contact with the work medium are lubricated using water,” said Bantle.
The researchers are anticipating that the new heat pump technology will enable reductions in industrial energy consumption of between 40 and 70 per cent, facilitated by the recovery of low-temperature waste heat. This will consequently reduce the need to use gas or electric boilers.
“This means that we no longer have to waste any heat, but can keep the heat we generate all to ourselves. This in turn will drastically reduce our greenhouse gas emissions because it will be possible to retain the surplus heat generated by the industrial process, feed it into the heat pump, and so increase the process temperature,” Bantle said.
“Investment in a heat pump costs money, but this technology will guarantee big savings that will enable us to recover our investment costs relatively quickly.”
Zero greenhouse gas emissions
“Since we have excellent access to clean energy here in Norway, there will be no greenhouse gas emissions from the use of this heat pump technology,” said Bantle.
In large parts of Europe, where the energy mix is not exclusively renewable, perhaps only a third of energy sources can be regarded as clean.
”However, even here, the new heat pump technology will result in similar reductions in greenhouse gas emissions. Emissions reductions will depend only to a small extent on where the electricity comes from, if the electricity is used to run a heat pump.”
It is anticipated that the technology will be launched onto the market during 2021.
The research project called ‘Free2Heat’ is a collaborative effort between SINTEF, NTNU and Norwegian pump and compressor manufacturers Tocircle, which supplies heat pumps to a number of industrial sectors.
The project was launched in 2019 and will continue until 2024.
The project is a spin-off generated at the HighEFF Centre for Environment-Friendly Energy Research.
