Horizontal Convective Boiling of R134a, R1234yf/R134a, and R1234ze(E) within a Micro-Fin Tube with Extensive Measurement and Analysis Details

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9781496030818: Horizontal Convective Boiling of R134a, R1234yf/R134a, and R1234ze(E) within a Micro-Fin Tube with Extensive Measurement and Analysis Details

This report presents local convective boiling measurements in a micro-fin tube for R134a and two low global warming potential (GWP ) refrigerants: R1234yf/ R134a, 56/44 % mass and R1234ze(E). Water heating either in counterflow or in parallel flow with the test refrigerant was used to vary the heat flux for a given quality. The heat transfer coefficient of the three test fluids were compared at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux using an existing correlation from the literature. The resulting comparison showed that refrigerant R134a exhibited the highest heat transfer performance in large part due to its higher thermal conductivity as compared to the tested low-GWP refrigerants. For the example case presented here, the heat transfer coefficient for R1234yf/ R134a (56/44) remains within 5 % of the heat transfer coefficient for R134a, having essentially identical performance for qualities less than 30 %. The heat transfer coefficient for R1234ze(E) is roughly 700 kW,K-1,m-2 (approximately 14 %) less than that of R134a for qualities greater than 30 %. The smaller heat transfer coefficient of R1234ze(E) as compared to that of R134a is primarily due to the 11 % smaller thermal conductivity and the 21 % smaller reduced pressure as compared to R134a at this test temperature. The measurements are important as part of the evaluation of low-GWP replacement refrigerants for R134a in unitary refrigeration and air-conditioning equipment.

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Descrizione libro 2014. PAP. Condizione libro: New. New Book.Shipped from US within 10 to 14 business days.THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000. Codice libro della libreria IP-9781496030818

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Descrizione libro Createspace. Paperback. Condizione libro: New. This item is printed on demand. Paperback. 60 pages. Dimensions: 11.0in. x 8.5in. x 0.1in.This report presents local convective boiling measurements in a micro-fin tube for R134a and two low global warming potential (GWP ) refrigerants: R1234yf R134a, 5644 mass and R1234ze(E). Water heating either in counterflow or in parallel flow with the test refrigerant was used to vary the heat flux for a given quality. The heat transfer coefficient of the three test fluids were compared at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux using an existing correlation from the literature. The resulting comparison showed that refrigerant R134a exhibited the highest heat transfer performance in large part due to its higher thermal conductivity as compared to the tested low-GWP refrigerants. For the example case presented here, the heat transfer coefficient for R1234yf R134a (5644) remains within 5 of the heat transfer coefficient for R134a, having essentially identical performance for qualities less than 30 . The heat transfer coefficient for R1234ze(E) is roughly 700 kW, K-1, m-2 (approximately 14 ) less than that of R134a for qualities greater than 30 . The smaller heat transfer coefficient of R1234ze(E) as compared to that of R134a is primarily due to the 11 smaller thermal conductivity and the 21 smaller reduced pressure as compared to R134a at this test temperature. The measurements are important as part of the evaluation of low-GWP replacement refrigerants for R134a in unitary refrigeration and air-conditioning equipment. This item ships from La Vergne,TN. Paperback. Codice libro della libreria 9781496030818

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Descrizione libro 2014. PAP. Condizione libro: New. New Book. Delivered from our US warehouse in 10 to 14 business days. THIS BOOK IS PRINTED ON DEMAND.Established seller since 2000. Codice libro della libreria IP-9781496030818

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Descrizione libro Createspace, United States, 2014. Paperback. Condizione libro: New. Language: English . Brand New Book ***** Print on Demand *****.This report presents local convective boiling measurements in a micro-fin tube for R134a and two low global warming potential (GWP ) refrigerants: R1234yf/ R134a, 56/44 mass and R1234ze(E). Water heating either in counterflow or in parallel flow with the test refrigerant was used to vary the heat flux for a given quality. The heat transfer coefficient of the three test fluids were compared at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux using an existing correlation from the literature. The resulting comparison showed that refrigerant R134a exhibited the highest heat transfer performance in large part due to its higher thermal conductivity as compared to the tested low-GWP refrigerants. For the example case presented here, the heat transfer coefficient for R1234yf/ R134a (56/44) remains within 5 of the heat transfer coefficient for R134a, having essentially identical performance for qualities less than 30 . The heat transfer coefficient for R1234ze(E) is roughly 700 kW, K-1, m-2 (approximately 14 ) less than that of R134a for qualities greater than 30 . The smaller heat transfer coefficient of R1234ze(E) as compared to that of R134a is primarily due to the 11 smaller thermal conductivity and the 21 smaller reduced pressure as compared to R134a at this test temperature. The measurements are important as part of the evaluation of low-GWP replacement refrigerants for R134a in unitary refrigeration and air-conditioning equipmen. Codice libro della libreria APC9781496030818

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Descrizione libro Createspace, United States, 2014. Paperback. Condizione libro: New. Language: English . Brand New Book ***** Print on Demand *****. This report presents local convective boiling measurements in a micro-fin tube for R134a and two low global warming potential (GWP ) refrigerants: R1234yf/ R134a, 56/44 mass and R1234ze(E). Water heating either in counterflow or in parallel flow with the test refrigerant was used to vary the heat flux for a given quality. The heat transfer coefficient of the three test fluids were compared at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux using an existing correlation from the literature. The resulting comparison showed that refrigerant R134a exhibited the highest heat transfer performance in large part due to its higher thermal conductivity as compared to the tested low-GWP refrigerants. For the example case presented here, the heat transfer coefficient for R1234yf/ R134a (56/44) remains within 5 of the heat transfer coefficient for R134a, having essentially identical performance for qualities less than 30 . The heat transfer coefficient for R1234ze(E) is roughly 700 kW, K-1, m-2 (approximately 14 ) less than that of R134a for qualities greater than 30 . The smaller heat transfer coefficient of R1234ze(E) as compared to that of R134a is primarily due to the 11 smaller thermal conductivity and the 21 smaller reduced pressure as compared to R134a at this test temperature. The measurements are important as part of the evaluation of low-GWP replacement refrigerants for R134a in unitary refrigeration and air-conditioning equipmen. Codice libro della libreria APC9781496030818

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