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Practical methods for measuring refrigerant mass distribution inside refrigeration system in Revue internationale du froid, vol 32, Issue 2 (2009)
[article]
Titre : Practical methods for measuring refrigerant mass distribution inside refrigeration system Titre original : Méthodes pratiques pour mesurer la masse du frigorigène à l'intérieur d'un système frigorifique Type de document : texte imprimé Année de publication : 2011 Article en page(s) : pp. 327-334 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique système à compression Charge en frigorigène Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The purpose of this paper is to present methods for measuring refrigerant mass distribution inside a refrigeration system conveniently and accurately. The quasi on-line measurement method (QOMM) was presented for measuring refrigerant mass inside heat exchangers. Compared with the existing liquid nitrogen method (LNM), QOMM can avoid the refrigerant waste and accelerate the measurement process. For measuring refrigerant mass inside the compressor, QOMM was used together with the oil level observation method. The liquid level method (LLM) was used to measure the refrigerant mass inside the accumulator and the receiver. In order to verify the accuracy of the measurement methods, not only the deviation of the measurement method for refrigerant in single component was analyzed, but also the prediction of the total refrigerant charge in an air conditioner was verified. The results showed that the maximal prediction deviation of the refrigerant charge in the whole refrigeration system is 1.7%.
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 327-334[article] Practical methods for measuring refrigerant mass distribution inside refrigeration system = Méthodes pratiques pour mesurer la masse du frigorigène à l'intérieur d'un système frigorifique [texte imprimé] . - 2011 . - pp. 327-334.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 327-334
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique système à compression Charge en frigorigène Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The purpose of this paper is to present methods for measuring refrigerant mass distribution inside a refrigeration system conveniently and accurately. The quasi on-line measurement method (QOMM) was presented for measuring refrigerant mass inside heat exchangers. Compared with the existing liquid nitrogen method (LNM), QOMM can avoid the refrigerant waste and accelerate the measurement process. For measuring refrigerant mass inside the compressor, QOMM was used together with the oil level observation method. The liquid level method (LLM) was used to measure the refrigerant mass inside the accumulator and the receiver. In order to verify the accuracy of the measurement methods, not only the deviation of the measurement method for refrigerant in single component was analyzed, but also the prediction of the total refrigerant charge in an air conditioner was verified. The results showed that the maximal prediction deviation of the refrigerant charge in the whole refrigeration system is 1.7%. Experimental evaluation of the inter-stage conditions of a two-stage refrigeration cycle using a compound compressor in Revue internationale du froid, vol 32, Issue 2 (2009)
[article]
Titre : Experimental evaluation of the inter-stage conditions of a two-stage refrigeration cycle using a compound compressor Titre original : Evaluation expérimentale des conditions entre les étages dans un cycle frigorifique biétagé muni d’un compresseur compound Type de document : texte imprimé Année de publication : 2011 Article en page(s) : pp. 307-315 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Expérimentation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The aim of the present paper is to detail an analysis, based on experimental data, of the inter-stage working conditions of a two-stage vapour compression facility equipped with a compound compressor, which operates with the most usual inter-stage configurations (two-stage with direct liquid injection and two-stage with subcooler) in medium- and low-capacity commercial refrigeration applications. The experimental analysis is performed in an evaporating temperature range between ?36 and ?20 °C, and in a condensing temperature range between 30 and 47 °C, using one of the fluids most widely-used in Europe for low-temperature applications, the R-404a. The inter-stage working temperature/pressure obtained in the tests has been contrasted with the two usual criterion of the optimum working conditions definition: the arithmetical mean of the refrigerant condensing and evaporating temperatures and the criterion of equal pressure ratios in both stages. This paper presents the differences and affinities with the criterion and analyses the influence of the intermediate systems (direct liquid injection and subcooler) on the inter-stage operating conditions.
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 307-315[article] Experimental evaluation of the inter-stage conditions of a two-stage refrigeration cycle using a compound compressor = Evaluation expérimentale des conditions entre les étages dans un cycle frigorifique biétagé muni d’un compresseur compound [texte imprimé] . - 2011 . - pp. 307-315.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 307-315
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Expérimentation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The aim of the present paper is to detail an analysis, based on experimental data, of the inter-stage working conditions of a two-stage vapour compression facility equipped with a compound compressor, which operates with the most usual inter-stage configurations (two-stage with direct liquid injection and two-stage with subcooler) in medium- and low-capacity commercial refrigeration applications. The experimental analysis is performed in an evaporating temperature range between ?36 and ?20 °C, and in a condensing temperature range between 30 and 47 °C, using one of the fluids most widely-used in Europe for low-temperature applications, the R-404a. The inter-stage working temperature/pressure obtained in the tests has been contrasted with the two usual criterion of the optimum working conditions definition: the arithmetical mean of the refrigerant condensing and evaporating temperatures and the criterion of equal pressure ratios in both stages. This paper presents the differences and affinities with the criterion and analyses the influence of the intermediate systems (direct liquid injection and subcooler) on the inter-stage operating conditions. Experimental investigation on diabatic flow of R-134a through spiral capillary tube in Revue internationale du froid, vol 32, Issue 2 (2009)
[article]
Titre : Experimental investigation on diabatic flow of R-134a through spiral capillary tube Titre original : Etude expérimentale sur l’écoulement diabatique du R-134a dans un capillaire en spirale Type de document : texte imprimé Année de publication : 2011 Article en page(s) : pp. 261-271 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Expérimentation Tube hélicoïdal Géométrie Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The present experimental investigation has been carried out to investigate the effects of various geometric parameters on the mass flow rate of R-134a through diabatic spiral capillary tube. In diabatic flow, the capillary tube is bonded with the compressor suction-line to form a counter-flow exchanger. The lateral type of diabatic capillary tube has been investigated in the present experimental study. The major geometric parameters investigated are capillary tube diameter, capillary tube length and coil pitch. In addition, effect of inlet subcooling on the mass flow rate through diabatic spiral capillary tube is also done. A comparison of the performance of diabatic spiral capillary tube has been made with adiabatic spiral capillary tube. Generalized empirical correlation for diabatic spiral capillary tube has also been proposed. It has been found that the predictions of the proposed correlation lie in the error band of ±7%.
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 261-271[article] Experimental investigation on diabatic flow of R-134a through spiral capillary tube = Etude expérimentale sur l’écoulement diabatique du R-134a dans un capillaire en spirale [texte imprimé] . - 2011 . - pp. 261-271.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 261-271
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Expérimentation Tube hélicoïdal Géométrie Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The present experimental investigation has been carried out to investigate the effects of various geometric parameters on the mass flow rate of R-134a through diabatic spiral capillary tube. In diabatic flow, the capillary tube is bonded with the compressor suction-line to form a counter-flow exchanger. The lateral type of diabatic capillary tube has been investigated in the present experimental study. The major geometric parameters investigated are capillary tube diameter, capillary tube length and coil pitch. In addition, effect of inlet subcooling on the mass flow rate through diabatic spiral capillary tube is also done. A comparison of the performance of diabatic spiral capillary tube has been made with adiabatic spiral capillary tube. Generalized empirical correlation for diabatic spiral capillary tube has also been proposed. It has been found that the predictions of the proposed correlation lie in the error band of ±7%. Performance of a large capacity propane heat pump with low charge heat exchangers in Revue internationale du froid, vol 33, Issue 2 (Mars 2010)
[article]
Titre : Performance of a large capacity propane heat pump with low charge heat exchangers Titre original : Performance d’une pompe à chaleur au propane d’une grande puissance avec des échangeurs de chaleur à faible charge Type de document : texte imprimé Année de publication : 2011 Article en page(s) : pp. 242-255 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur Système à compression Propane Micro-canal Charge en frigorigène Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur
in Revue internationale du froid > vol 33, Issue 2 (Mars 2010) . - pp. 242-255[article] Performance of a large capacity propane heat pump with low charge heat exchangers = Performance d’une pompe à chaleur au propane d’une grande puissance avec des échangeurs de chaleur à faible charge [texte imprimé] . - 2011 . - pp. 242-255.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 33, Issue 2 (Mars 2010) . - pp. 242-255
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur Système à compression Propane Micro-canal Charge en frigorigène Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Performance of V-type Stirling-cycle refrigerator for different working fluids in Revue internationale du froid, vol 33, N°1 (janv 2010)
[article]
Titre : Performance of V-type Stirling-cycle refrigerator for different working fluids Titre original : Diminution de la consommation d'électricité dans les systémes frigorifiques á plusieurs compresseurs Type de document : texte imprimé Année de publication : 2011 Article en page(s) : pp. 12-18 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Compresseur à vis Modélisation Régulation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur
in Revue internationale du froid > vol 33, N°1 (janv 2010) . - pp. 12-18[article] Performance of V-type Stirling-cycle refrigerator for different working fluids = Diminution de la consommation d'électricité dans les systémes frigorifiques á plusieurs compresseurs [texte imprimé] . - 2011 . - pp. 12-18.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 33, N°1 (janv 2010) . - pp. 12-18
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Système à compression Compresseur à vis Modélisation Régulation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Refrigerant concentration measurement at compressor oil sump by refractive index (concentration of R410A in PVE oil) in Revue internationale du froid, vol 33, Issue 2 (Mars 2010)
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