Performance Investigation of R290 As A Substitute to R22 Refrigeration System
Notice bibliographique
Résumé
In this study, Use of natural refrigerant R290 can play a vital role in fulfilling the objectives of the international protocols like Montreal and Kyoto. Because of environmental issues such as ozone depletion and global warming, R22 needs to be phased out on urgent basis. This paper analyzes the possibilities of R290 as a potential substitute to R22. Thermodynamic performance analysis of refrigerants R290 and R22 was carried out using standard vapour compression cycle, with evaporating temperature range of -5oC, condensing temperature of 30°C and compressor efficiency is taken as 65%, based on analytical calculations. Performance parameters like, coefficient of performance, refrigeration effect, and compressor work. All the analysis in this paper for performance comparison of refrigerant is done by engineering equation solver software commonly known as EES software. From the analysis it is found to be that R290 is a better substitute of R22. However, the flammable characteristics of R290 prevented its wide application in the large air conditioning system. Thus special precautions are needed for its use and maximum charge quantity of R290 in refrigeration system is also restricted by international safety standards. Recently the study of flammable refrigerants used in air conditioner has attracted worldwide attention. Coefficient of performance with R290 is slightly lower than that of with R22. However, by adding a liquid-vapour heat exchanger in the vapour compression cycle we can increase coefficient of performance and other properties. Engineering Equation Solver (EES) was used to simulate a mechanical refrigeration system in two configurations: modified system with liquid-vapour heat exchanger and system without liquid-vapour heat exchanger. The results revealed that the liquid-vapour heat exchanger has a significant effect on the system performance as it influences the sub cooling and superheating temperatures. The results showed us that the high value of the coefficient of performance (COP) was achieved by the modified system which has a single stage vapour compression refrigeration system with refrigerant R290. Overall, R290 can be a better substitute to R22 in real applications because of its excellent environmental properties and thermo physical properties. R290 is a low cost, widely available and efficient. They also have zero ozone depletion potential and very low global warming potential. Despite the flammability, they are increasingly used in domestic refrigerators. In 2010, about one-third of all household refrigerators and freezers manufactured globally used isobutane or an isobutane/propane blend, and this was expected to increase to 75% by 2022.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».