02 May 2023
CASE STUDY: Why a heat transfer fluid formulated by Climalife was selected as part of a major cooling upgrade.
For 14 years, Técnicas y Aplicaciones Frigoríficas Salmantinas (Tafrisa) has been recognised in the Spanish market as a professional, competitive and quality company. It carefully examines the needs of its customers and selects the right equipment and products to achieve the best performance in refrigeration installations.
Tafrisa specialises in industrial refrigeration in the food industry, with its main activities in abattoirs, meat preparation facilities, fruit and vegetables, as well as temperature and humidity control in the drying and maturing processes of hams, sausages and cheeses.
Two of Tafrisa’s customers, Valle San Juan and La Antigua, are both sheep cheese dairies that have seen considerable growth in recent years and needed to adapt their cooling facilities.
Vegetable or petro-chemical coolant?
The installer studied the transformation plans for each of the cheese dairies, with the new equipment to be built. The decision was taken to install an indirect ammonia system with a traditional MPG heat transfer fluid. The difficult economic situation however meant that there were issues with availability from the monopropylene glycol supplier and sharp rising MPG prices.
This is when Climalife introduced the bio-based alternative Greenway Neo N, with its new NSF HT1 formula. "When we studied the technical characteristics and saw that it was about 10% more efficient according to our calculations, we had no doubt. The fact that Greenway Neo N is NSF HT1 registered and that it is biodegradable confirmed our decision. Moreover, it is a sensible choice for any company concerned about the environment," said Javier Sánchez, industrial engineer at Tafrisa.
Another proven quality of the heat transfer fluid is its durability. Tafrisa had the Greenway Neo N analysed to check its condition as part of the maintenance of the Valle San Juan cheese factory. The Climalife laboratory carried out this service and the analysis confirmed that "the heat transfer fluid was in perfect condition. There was no degradation of the Greenway Neo N, no damage to the pipes, we saw no dirt, no oxidation or corrosion," says Rufino Fuentes, head of Tafrisa.
One installation instead of multiple systems
The two ammonia plants supply several dryers, ripening and storage rooms with Greenway Neo N heat transfer fluid to regulate both the temperature around +8°C, and the relative humidity. Lower set points must be achieved in the fresh product dryers than in the ripening rooms, which is essential in the initial phase of cheese production to control product shrinkage.
The difference between the two installations, apart from the net volume (see table below), is that La Antigua has installed a controlled ice maker and ice reserve that supplies the plant with cold water at +1.5°C every day of production. The ice generator is equipped with a coil regulated with Greenway Neo N heat transfer fluid at -8°C, which contributes to the general economy of the installation in two ways:
- Economically: it is in operation during the hours when electricity prices are lower,
- Energetically with a double aspect, because
- It avoids continuous operation of the machines.
- It avoids peak consumption with controlled refrigeration production to cool a food product such as whey, which enters at ~35°C and would generate a large refrigeration demand.
An innovative system of uniform air diffusion in the ripening room was also installed in order to have a more homogeneous circulation with a constant back-and-forth movement that evens out the shrinkage of all products. This is essential for both cheese dairies.
The projects are not yet finalised, but both factories are already confident in their choice and will continue to develop with Greenway Neo N installations to produce thousands of tonnes of raw sheep's milk cheese. In conclusion, the director of Tafrisa is satisfied with the systems in place. He said: "Finally, we have seen that it works well for us, the ripening rooms work much better, we get cheese with less waste and less loss of mass."
For information regarding this article, please contact Mel Summers, marketing manager, Climalife UK.
- Tel: +44 117 980 2520
- Email: [email protected]