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Méthodes d’évaluation en temps réel de la charge en frigorigène dans les pompes à chaleur résidentielles : évaluation expérimentale en chambre climatique.

Methods for real-time assessment of refrigerant charge in residential heat pumps: experimental evaluation in climatic chambers.

Numéro : 2193

Auteurs : JOUNAY M., CAURET O., TEUILLIERES C., TRAN C. T.

Résumé

Given their performance, heat pumps are a key technology to decarbonize the heating production in buildings. Their share in the residential heating market is increasing at a very fast pace, making preventive maintenance and, thus, automatic fault detection and diagnosis always more necessary, especially to maintain an optimum efficiency and lighten the load for installers-maintainers. Soft and progressive faults such as refrigerant leakages must be detected before they deteriorate the performance of the system or even damage the components. Several methods for detecting and, more rarely, assessing refrigerant leaks have been developed. However, most focus on cooling or airconditioning devices, which also often lack up-to-date technologies such as variable-speed compressors and electronic expansion valves. However, some methods do stand out due to their interesting approaches and accurate results.
The study presented here is part of a global work dedicated to the development of a method to determine in real time the refrigerant charge of a residential heat pump. Previous work consisted in identifying two promising methods of charge assessment and then developing and validating a model of a heat pump for their numerical evaluation. The work presented in this article is dedicated to the extensive experimental evaluation of these two methods, carried out in climatic chambers. The system studied is an air-to-water heat pump filled with R32 and equipped with a variablespeed compressor and an electronic expansion valve. Two sets of tests were carried out in heating mode and for different levels of charge. The first consisted of stationary and imposed operating conditions, whereas the second one included scenario-based Hardware-In-the-Loop (HIL) dynamic conditions. The experimental data collected was used for the validation of the numerical model of the heat pump required for one of the methods, and for the evaluation of both methods. However, they were ineffective in assessing the charge in the system, as the heat pump studied has proved very resistant to refrigerant loss. For such adaptive and high-performance technologies, which will become increasingly common on the residential market, the development of new methods for charge assessment will therefore be necessary.

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Détails

  • Titre original : Methods for real-time assessment of refrigerant charge in residential heat pumps: experimental evaluation in climatic chambers.
  • Identifiant de la fiche : 30033073
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 17/07/2024

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