Mesurement of Isobaric Heat Capacity for R 134a and Carbon Dioxide by Using a Flow Calorimeter(Thermal Engineering)

Kagawa, Noboru; Matsuguchi, Atsushi; Watanabe, Koichi

doi:10.1299/kikaib.75.755_1491

Cited by 6 publications

(15 citation statements)

References 3 publications

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“…Mukoyama et al and Yamamoto et al obtained c p measurements of 1,1,1,2-tetrafluoroethane, CF 3 CH 2 F, and 1,1,1-trifluoroethane, CF 3 CH 3 , in the gas phase by developing the flow calorimeter that was used for this study. The additional c p measurements of 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane were measured and the measurements were compared with published EOSs. , After the series of measurements, c p measurements in the gas phase of some materials, including difluoromethane, CH 2 F 2 , , and trans -1,3,3,3-tetrafluoropropene, trans -CHFCHCF 3 , were obtained. Calculations using some formulated EOSs were compared with the measurement to evaluate the EOS calculations on the caloric properties in the gas state.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Isobaric Heat Capacity of 2,3,3,3-Tetrafluoroprop-1-ene in the Gas Phase

Kagawa

Matsuguchi

2020

J. Chem. Eng. Data

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The isobaric specific heat capacity c p of 2,3,3,3-tetrafluoroprop-1-ene was measured in the gaseous state and the behavior was presented in c p–T and c p–p diagrams. A total of 62 c p data were obtained for temperatures (T) in the range of 289 to 353 K and for pressures (p) of 0.3 to 2.2 MPa with a flow calorimeter. Some of them were obtained in the immediate neighborhood of the saturation regime. The estimated expanded uncertainties (k = 2) of the temperature measurements U(T) and the pressure measurements U(p) is to be less than 33 mK and 12 kPa, respectively. That for c p measurements U c(c p) are calculated to be from 10 to 60 J·kg–1·K–1. Also, two published equations of state were evaluated with the c p measurements. Using the measurements and evaluated data, several isotherms and the saturation of 2,3,3,3-tetrafluoroprop-1-ene in the gas phase were presented in the c p–p diagram.

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Section: Introductionmentioning

confidence: 99%

Behavior of Isobaric Heat Capacity of 2,3,3,3-Tetrafluoroprop-1-ene in the Gas Phase

Kagawa

Matsuguchi

2020

J. Chem. Eng. Data

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“…The experimental procedure was reported by Mukoyama et al and the authors. , This paper describes its outline. As shown in Figure a, the calorimeter tube is placed inside of an evacuated thermal insulation, and both the tube and the insulation are set in a water bath whose water temperature is kept at the target temperature within ±10 mK.…”

Section: Methodsmentioning

confidence: 99%

“…The authors measured c p of tetrafluoroethane and carbon dioxide using this flow calorimeter in the previous work. , The data were compared with their standard EOSs. The deviations were from (−0.15 to −1.3) % and (−0.86 to 1.25) % which are within the calculation uncertainty of the EOSs.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental expanded uncertainty was carefully assessed and reported in detail. , On the basis of the ISO/IEC guideline, the experimental expanded uncertainty (with a coverage factor k = 2) of T U ( T ) is estimated from (11 to 50) mK; in most cases, it is less than 30 mK. It is obtained by the calibration test of the PRTs ( u ( T PRT ) = 4 mK), the temperature distribution in the heating section ( u ( T d ) < 50 mK), and the accuracy of each instrument.…”

Section: Measurementsmentioning

confidence: 99%

“…The additional c p measurements of 1,1,1,2-tetrafluoroethane were obtained by the authors and the measurements were evaluated with available EOSs . After the series measurements, c p measurements in the gas phase of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, CHF 2 CF 2 OCH 2 CF 3 , 1,1,1-trifluoroethane, CF 3 CH 3 , carbon dioxide, CO 2 , pentafluoroethane, trans-1,3,3,3-tetrafluoropropene, trans-CHF = CHCF 3 , and difluoromethane, CH 2 F 2 , were obtained. These reports made comparison with the measurements and calculations from some EOSs.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of Isobaric Heat Capacity of Pentafluoroethane in the Gas Phase

2018

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The isobaric specific heat capacity c p of gaseous pentafluoroethane was measured and the behavior was presented. With a flow calorimeter, 29 c p data of pentafluoroethane were measured at temperatures T from (303 to 343) K and at pressures p from (0.5 to 2.4) MPa. Some of them were measured in the immediate vicinity of the saturation curve. The expanded uncertainties (k = 2) of the temperature measurements U(T) and the pressure measurements U(p) are estimated to be below 50 mK and 11 kPa, respectively. That for c p measurements U c (c p ) is assessed to extend from (14 to 60) J•kg −1 •K −1 . Then, the c p measurements including the previous 12 measurements were compared with some available equations of state. Using these confirmed data, the c p behaviors of gaseous pentafluoroethane were presented in a c p −p diagram.

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