[en] A reliable description of the dew line of refrigerants is paramount for the safe operation of heat pumps. For commonly
used molecules in industrial heat pumps, polynomials for the control of effective superheat are widely available.
However, the approach to customize refrigerant mixtures has gained attention in recent years, which introduces a need
to find polynomials to describe the vapor pressure curve for a wide range of fluid mixtures. This study investigates
two methods to approximate the vapor pressure curve in a heat pump test stand for pure R-600a and a mixture with
R-600a and R-290. For pure R-600a, the best polynomial could reproduce the reference vapor pressure curve in the
tested region within 9.6 𝑘𝑃𝑎, for the mixture, the best fit achieved an accuracy of 57.9 𝑘𝑃𝑎.
Disciplines :
Energy
Author, co-author :
Lemke, Paul ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Schindler, Ulrich; Karlsruhe University of Applied Sciences > Schaufler Professorship for Compressor Technology, Institute for Refrigeration-, Air Conditioning and Environmental Technology
Langebach, Robin; Karlsruhe University of Applied Sciences > Schaufler-Professorship for Compressor Technology, Institute for Refrigeration-, Air Conditioning and Environmental Technology
Brendel, Leon P. M.; Eastern Switzerland University of Applied Sciences > Institute for Energy Systems
Lemort, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Thermodynamique appliquée
Bertsch, Stefan S.; Eastern Switzerland University of Applied Sciences > Institute for Energy Systems
Language :
English
Title :
Approximation of Vapor Pressure Curve with Optical Methods in a Heat Pump Test Stand for Pure Isobutane and an Isobutane/Propane Mixture
Publication date :
13 July 2026
Event name :
Herrick Conferences 2026
Event organizer :
Herrick Laboratories - Purdue University
Event date :
13th - 16th of July 2026
Audience :
International
Development Goals :
7. Affordable and clean energy
Name of the research project :
BRIDGE Discovery: flexible refrigerant mixtures make heat pumps more efficient
