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Theoretical development of thermodynamic properties of an environmental friendly refrigerant RE170 by using Martin HOU equation of state.

Number: pap. 2572

Author(s) : SHARMAS VALI S., ASHOK BABU T. P.

Summary

This paper deals with the theoretical development of thermodynamic properties of an environmental friendly refrigerant dimethylether (RE170). Since hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) are going to be phase out and phase down as per Montreal and Kyoto protocol respectively. Refrigerant RE170 has zero ozone depletion potential (ODP) and very low global warming potential (GWP) which is less than two. Hence RE170 is considered as a viable option to replace for the refrigerants with GWP like HFCs. RE170 can be used as blend component with other ecofriendly refrigerant. The main objective of the present study is to compute the thermodynamic properties of RE170 by using Martin Hou equation of state (MH EOS). These properties are useful to do the thermodynamic analysis of a vapour compression refrigeration cycle. The properties computed are saturation vapour pressure, liquid density, vapour specific volume, enthalpy and entropy (both in the saturated liquid and vapour state). In the present study a MATLAB code is developed to compute the above considered thermodynamic properties from the temperature about 131.6K-398.15K and pressure up to 51.3bar. The computed properties of dimethylether is compared with NIST REFPROP database. Since thermodynamic properties of RE170 are not available in ASHRAE hand book and also in the literature. Therefore NIST REFPROP can be considered as a reliable source as that of ASHRAE. The results shows that the absolute average deviation (AAD) of liquid and vapour phase enthalpy from that of NIST REFPROP is 1.01% and 0.319% respectively. Similarly AAD of liquid and vapour phase entropy is 1.05% and 0.25% respectively. Deviation of vapour specific volume and liquid density is 1.49% and 0.25% respectively. AAD of saturation pressure is 0.071%. Overall the computed thermodynamic properties of RE170 by using MHEOS shows good agreement with NIST REFPROP database for wide the temperature range about 131.6K-398.15K and pressure up to 51.3bar.

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Pages: 13

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Details

  • Original title: Theoretical development of thermodynamic properties of an environmental friendly refrigerant RE170 by using Martin HOU equation of state.
  • Record ID : 30024652
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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