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CO2 heat pump with and without cooling output for hot water production in tropical climates.

Number: 1238

Author(s) : REDDY Y. S. K., GURUCHETHAN A. M., KOCHUNNI S. K., SINGH S., HAFNER A., MAIYA M. P.

Summary

In developing countries such as India, energy-intensive buildings like hotels, multi-specialty hospitals, etc., use water cooled chillers and inefficient fossil fuel-fired boilers to meet cooling and domestic hot water (DHW) demands. Alternatively, a clean energy efficient CO2 heat pump chiller could be adapted to cater to the complete heating and partial cooling needs. The CO2 heat pump system can either produce chilled water (CHW) or provide top-up cooling of the condenser water (CW) of the existing chiller. Accordingly, a reduction in evaporator load or enhancement in COP of the chiller is possible. In this regard, the performance potential of the ejector assisted CO2 heat pump is examined for both scenarios (CHW or CW as a heat source) and compared with an Indian hotel requirement as a case study. The findings indicate, when heating water from 28 to 70 °C, the CO2 system utilizing CW as a heat source consumes 25-26 % less energy and boosts cooling capacity by 7-9 % compared to using CHW as the source. Consequently, employing the CO2 heat pump with CW as the source for hotel heating demands results in lesser running cost compared to the cooling benefit cost it can provide, which results in negligible annual operating cost (0.3 % of existing diesel boiler system operating cost). On the other hand, the proposed system utilizing CHW as the source incurs 8 % of the operating cost of the existing system. Thus, the former system emerges not only as a cleaner and more eco-friendly option but also as an exceptionally efficient solution compared to existing diesel boiler systems for meeting hot water demands.

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Pages: 11 p.

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Details

  • Original title: CO2 heat pump with and without cooling output for hot water production in tropical climates.
  • Record ID : 30032739
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl.2024.1238

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