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High-Glide Refrigerant Blends in High-Temperature Heat Pumps: Part 2 – Inline Composition Determination for Binary Mixtures{fr}Mélanges de fluides frigorigènes à haut pouvoir glissant dans les pompes à chaleur à haute température: Partie 2 - Détermination en ligne de la composition des mélanges binaires
Abstract
Refrigerant mixtures are frequently used in air-conditioners and heat pumps. However, mixtures with high glides of 30 K and more during evaporation are rare, partially because there is an increased concern about composition shifts within the system. An easy and reliable inline composition measurement could alleviate these concerns and simplify the handling of systems with high-glide mixtures. This study investigates six composition determination methods, which are all non-invasive, five of which can be conducted during system operation. All methods are applied to all available mixtures in a dataset of 380 data points. The binary and ternary mixtures tested consist of the refrigerants R-1233zd(E), R-1336mzz(Z), R-1234yf, R-1224yd(Z), and R-32. A method was always applied to all datapoints collected with a certain refrigerant mixture at varying operating conditions. The average of the calculated mass fractions was then compared to the manually charged mass fraction. For the density method, this difference of the calculated and measured mass fraction was never more than 0.03 and usually smaller than 0.01 across all tested mixtures. Most other methods performed well with deviations typically less than 0.05. Some of the methods require only low-cost sensors like thermocouples and pressure transducers. Property data of ternary mixtures is also discussed in the study but a composition determination is not attempted. Show more
Publication status
publishedExternal links
Journal / series
International Journal of RefrigerationPublisher
ElsevierSubject
High-temperature heat pump; composition determination; refrigerants; blends; mixtures; inline; online; pompe à chaleur haute température; détermination de la composition; réfrigérants; mélanges; en ligneOrganisational unit
09696 - Bardow, André / Bardow, André
Funding
203645 - High-efficiency high-temperature heat pumps with temperature glide (SNF)
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