Share

Monitoring of two ground-source heat pumps working with R454B and R600a in a pilot facility.

Number: 2386

Author(s) : MENEGAZZO D., LOMBARDO G., BOBBO S., FEDELE L., DE CARLI M., BORDIGNON S., POLETTO F., MENDRINOS D., BORTOLIN A., BERNARDI A.

Summary

The European building sector represents approximately 40% of total energy consumption and contributes significantly with the 36% of the overall greenhouse gas emissions. A primary goal of the European Commission involves the identification of technological remedies aimed at reducing energy consumption and mitigating greenhouse gas emissions. Among these solutions, ground source heat pumps (GSHPs) emerge as a promising avenue, displaying potential for notable reductions in greenhouse gas emissions within HVAC systems. Within the EU GEO4CIVHIC research project, two GSHPs have been designed and installed in a pilot building. The two heat pumps work with R454B (GWP=466) and isobutane (R600a, GWP=3), respectively. R454B is a mid-term mildly flammable refrigerant with a GWP of 466, while R600a is natural highly flammable refrigerant with a GWP of 3. Both the systems are fully equipped with research-kind measurement instruments. In particular, the inlet and the outlet of each component of the refrigerant circuits is equipped with temperature and pressure sensors. On the ground-water circuit and the user-water circuit, temperature sensors are installed at the inlet and the outlet of each heat exchanger, along with electromagnetic flow-meters to measure the water volumetric flow rate. The two heat pumps have been operated in alternate days, in order to be monitored under similar boundary conditions, allowing a comparison of the performance between the two refrigerants. This work describes the monitoring system and presents the first results obtained from the two systems. The comparison is based on the COP values of the heat pumps. Moreover, this work highlights the importance of the refrigerant choice in the system design, and its influence on the cycle components.

Available documents

Format PDF

Pages: 10 p.

Available

Free

Download

Details

  • Original title: Monitoring of two ground-source heat pumps working with R454B and R600a in a pilot facility.
  • Record ID : 30033151
  • Languages: English
  • Source: 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

Links


See other articles from the proceedings (64)
See the conference proceedings

Indexing