Low-GWP Working Fluid Mixtures Screening for Industrial High Temperature Heat Pumps with Supply Temperature >200 °C

Published

August 15, 2024

Author(s)

Jan Spale, Andreas Hoess, Ian Bell, Davide Ziviani

Abstract

Single-component working fluids, which could be used in a safe, efficient, reliable, and cost-effective industrial high temperature heat pump (HTHP) subcritical vapor-compression cycle (VCC) for process heat delivery at 200 °C are scarce and come with significant technical limitations. We therefore propose searching for a mixture that could meet these criteria. Hence, we created a Python code using REFPROP and Cantera libraries to model a simplified HTHP VCC with an advanced cycle architecture and to assess the flammability of the mixture. Ten single-component fluids consisting of two subsets – hydrocarbons and hydro(chloro)fluoroolefins – were identified. From these, over 460,000 binary, ternary and quaternary mixtures were created. Solving the advanced HTHP VCC for each, we obtained cycle performance results which we filtered and sorted using thermodynamic and technical criteria. We did not find a perfect mixture which would meet all our criteria but a binary blend of cyclopentane and R1336mzz(Z) with mole fraction of [0.68,0.32] was selected as the winner candidate of the screening given the imposed limits. This mixture will be further experimentally investigated and used in a purpose-built test rig for HTHP screw compressor development. This work is a shortened version of a more extensive journal publication currently under review at the time of this conference manuscript submission. (Spale et al., 2024a)

Conference Dates

July 15-18, 2024

Conference Location

West Lafayettte, IN, US

Conference Title

20th International Refrigeration and Air Conditioning Conference at Purdue, July 15 - 18, 2024

Pub Type

Conferences

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Citation

Spale, J. , Hoess, A. , Bell, I. and Ziviani, D. (2024), Low-GWP Working Fluid Mixtures Screening for Industrial High Temperature Heat Pumps with Supply Temperature >200 °C, 20th International Refrigeration and Air Conditioning Conference at Purdue, July 15 - 18, 2024, West Lafayettte, IN, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957850 (Accessed September 26, 2024)