Studies on isobaric specific heat capacity of liquid under high pressure
Project/Area Number |
02650690
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
化学工学
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Research Institution | Kobe University |
Principal Investigator |
KUBOTA Hironobu Kobe Univ. Engineering Associate Professor, 工学部, 助教授 (60031077)
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Project Period (FY) |
1990 – 1991
|
Project Status |
Completed (Fiscal Year 1991)
|
Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1991: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
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Keywords | Isobaric Specific Heat Capacity / High Pressure Liquid / CFC alternatives / HCFC123 / HCFC141b / 高圧 / 高圧流体 / 液体比熱 / 定圧比熱 / 定圧比熱定量 |
Research Abstract |
Thermophysical properties of fluids, such as heat capacity and enthalpy, are important for various process calculations. Although, these properties can be calculated by the experimental PVT data or the equation of state, it is very difficult to estimate reliably the errors in the first and second derivatives of these PVT properties. Therefore, the direct experimental determination of heat capacity is desirable. A new adiabatic flow calorimeter was designed and constructed. In this calorimeter, steady flow of liquid past a thermometer, a heater and second thermometer under a constant pressure. By measurement of the flow rate, of power input to the heater and of liquid temperatures at inlet and outlet of the calorimeter, the apparent heat capacity of the sample liquid may be calculated. Usually there are some heat losses, therefore an adequate correction should be made to obtain the true heat capacity. This calorimeter can measure the isobaric heat capacity, Cp, of pure liquids and their mixtures precisely and conveniently in the temperature range from 230 to 420K and pressures up to 4OMPa. The uncertainty of the measurements is estimated to be within <plus-minus>2.1 At first, the isobaric specific heat capacity of HCFC123 (CH_3CHCl_2) whose heat capacity data were reported in the literature was measured to confirm a reliability of this apparatus and procedure. Measurements were carried out at the temperature 310.2 and 320.2K and pressure 1.0MPa. The present results agree with the literature values within the experimental uncertainty. The heat capacity of HCFC14lb (CH_3CCl_2F) was measured at temperature from 303 to 323K and pressures up to 1.0MPa. In this experimental conditions, heat capacities obtained decreased monotonously with increasing pressure.
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Report
(3 results)
Research Products
(1 results)