The UJI is working on the development of an ultra-low temperature refrigeration system with minimum environmental impact



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## The UJI is working on the development of an ultra-low temperature refrigeration system with minimum environmental impact

08/02/2022 |
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* [![ refrigeracio-baixa-temperatura ISTENER](/com/investigacio/arxiu/noticies/2022/2/refrigeracio-baixa-temperatura/ISTENER.jpg)](#)

The research group in Thermal and Energetic Systems Engineering (ISTENER) at the Universitat Jaume I, led by the lecturer Joaquín Navarro, is working on a project that aims to develop an ultra-low temperature refrigeration system that has a minimal contribution to climate change.

Vaccines for COVID-19 have put the focus on ultra-low temperature refrigeration systems, although they are also used in many other biomedical and industrial fields. Due to their complexity, the environmental impact of these systems in terms of energetic efficiency and the refrigerants used is not controlled. “While other refrigeration and heat pump applications have implemented environmental protection policies that restrict refrigerants with high global warming potential (GWP) values, ultra-low temperature refrigeration has not been included in these policies”, explains Navarro.

In this context, the three-year project, with funding of nearly 100,000 euros from the Spanish Scientific, Technical and Innovation Research Plan (PEICTI), will seek to develop an eco-efficient ultra-low temperature solution using advanced energy-efficient vapour compression system configurations and low GWP working fluids.

The system that is expected to be obtained must be capable of operating at evaporating temperatures between - 50 and - 75 °C and between 20 and 30 °C ambient temperature. In addition to prioritising environmental parameters, other systems, components and working fluid characteristics such as safety, stability, initial and operating costs, reliability and performance will also be considered in the design, construction and analysis of the prototype. An ultra-low temperature refrigerant based on low GWP blends will also be sought.

At the same time, with the base configuration defined, an update and optimisation of the configuration and refrigerants to be used in the low-pressure stage will be carried out, although without forgetting about the high-pressure stage, where there are alternatives to optimise. It is also planned to build a test bench to experimentally test the performance of the proposed system against current configurations and fluids and to validate the compatibility of the refrigerants with the components.

"In this way, an ecological and thermo-economically optimised solution will be obtained and the use of new refrigeration technologies will be proposed, in addition to testing the feasibility of the development in different applications such as industrial refrigeration networks or smart cities," says the project leader.

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