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Performance evaluation of a hybrid air conditioning system based on transcritical CO2 cycle.

Number: 2430

Author(s) : MAQBOOL S., MADDALI R.

Summary

A hybrid air conditioning system that uses CO2 (R-744) as refrigerant is proposed for summer air conditioning applications. In the proposed system the cooling capacity of the transcritical CO2 cycle is utilized for sensible cooling of process air while the heating capacity is used for regeneration of the desiccant wheel, which handles the latent heat load on the building. Three configurations (C1, C2 and C3) based on the location of desiccant wheel are analyzed using suitable thermodynamic and psychrometric equations. Results obtained for warm and humid climate show that among the three configurations, C1 yields the best performance in terms of the compressor power consumption while C2 yields the best performance in terms of utilization of gas cooler heating capacity. The performance of the hybrid system with different configurations is compared with that of a conventional air conditioning system that uses R-1234yf as refrigerant. It is observed that the compressor power required for the hybrid system is much less than that of R-1234yf system under high latent load conditions. Also, the compressor power variation is marginal under all room sensible heat factors for the hybrid system, whereas it increases steeply in a non-linear manner for the R-1234yf system as the room sensible heat factor decreases. In addition, the evaporator temperature is above 0°C for the hybrid system under all load conditions, whereas it goes below 0°C for the R-1234yf system at high latent loads. Results show that the environment friendly CO2 based air conditioning systems can be made competitive in terms of energy efficiency by using the proposed hybrid cycles.

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  • Original title: Performance evaluation of a hybrid air conditioning system based on transcritical CO2 cycle.
  • Record ID : 30030723
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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