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Démonstration et évaluation des performances d’un capteur de surchauffe virtuel.

Demonstration and performance evaluation of a virtual superheat sensor.

Numéro : 2137

Auteurs : YUILL D. P., ROOHOLGHODOS S. A.

Résumé

Suction superheat is an important monitored variable in vapor compression refrigeration cycles. Superheat is the difference between actual temperature and saturation temperature. Positive superheat is used to ensure that no liquid enters the compressor. A common approach of metering refrigerant is the use of a thermostatic expansion valve (TXV), which mechanically assesses the amount of superheat and modulates the metering valve to maintain a superheat setpoint. As electronic expansion valves become more common, alternative methods for measuring superheat are needed. In addition, many fault diagnostic methods use superheat as an input variable. The obvious method of determining superheat – measuring pressure and temperature on the suction line – has the drawbacks that pressure measurements are costly, and they provide a potential leakage point for refrigerant. To address this problem, we have developed a virtual superheat sensor (VSS) method that has two characteristics that are important for practical deployment. The first is that the method uses temperature measurements only. The second is that the method uses measurement locations that are all in the outdoor unit of a split system, meaning that it could be applied without access to the interior of the building, and without knowledge of the indoor coil properties.
This paper is focused on demonstrating the VSS. It reviews the principles of operation of the VSS, then demonstrates its application and performance in an air-conditioner that is operating correctly, and also with refrigerant charge faults of varying intensity. The air-conditioner was modeled, and also tested experimentally in a laboratory. The VSS makes use of surface temperature measurements from the compressor discharge and suction lines, and outdoor coil tube bends of an air-cooled air conditioning system. It involves an iterative calculation of the predicted superheat, and consideration of compressor efficiency. The paper shows that the VSS is sufficiently effective in determining suction superheat in real-world deployments, allowing it to be used for effective charge level estimation using a virtual refrigerant charge sensor.

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Pages : 8 p.

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Détails

  • Titre original : Demonstration and performance evaluation of a virtual superheat sensor.
  • Identifiant de la fiche : 30032989
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 17/07/2024

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