Skip to main content
Log in

Calculation Technique of Some Thermodynamic Functions using the Results of Joint Thermal and Acoustic Measurements

  • HEAT AND MASS TRANSFER AND PROPERTIES OF WORKING FLUIDS AND MATERIALS
  • Published:
Thermal Engineering Aims and scope Submit manuscript

Abstract

An original method of calculating isochoric and isobaric heat capacity based on the fundamental relationships of thermodynamics is presented. The theoretical development of the methodology for calculating isochoric and isobaric heat capacity can be used to obtain high metrological data on the thermophysical properties of new low-boiling working substances of power plants operating on the Rankine organic cycle and to replenish existing databases. The technique allows the use of heterogeneous experimental results of acoustic and thermal measurements to calculate the basic thermodynamic functions without information about the values of ideal gas functions, and also to evaluate the consistency of experimental data. Formulas are derived for calculating isobaric and isochoric heat capacities, which are based on reliable equations describing experimental data on the speed of sound and density depending on state parameters. The method was tested using both the characteristics of the reference substances (H2O and CO2), and own new experimental data on the thermal and acoustic properties of octafluorocyclobutane (c-C4F8) in the liquid phase for temperatures of 320 and 340 K and pressures from 4 to 10 MPa. The isochoric heat capacity was calculated from measurements of the density of octafluorocyclobutane and the speed of sound in it. According to the latest series of density measurements in a limited region of the states of the liquid phase of octafluorocyclobutane obtained by the constant volume piezometer method, the isochoric heat capacity was calculated using the equation proposed in this work. The uncertainty of the experimental data used for the test calculation of the density did not exceed 0.25%, and the speed of sound did not exceed 0.05%. The standard deviation in the description of the dependence of thermal quantities was 0.23%, and acoustic—0.15%.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.

Similar content being viewed by others

REFERENCES

  1. A. A. Sukhikh, V. A. Milyutin, and I. S. Antanenkova, “Thermodynamic efficiency of carbon fluorines as working bodies in thermal cycles of nuclear power plants,” Elektr. Stn., No. 10, 2–8 (2010).

  2. V. V. Starovoitov, A. A. Sukhikh, and V. A. Milyutin, “Analysis of the efficiency of the systems for utilization of waste products of combustion of gas pumping units,” Probl. Energ., No. 3–4, 68–79 (2014).

  3. V. V. Sychev, The Differential Equations of Thermodynamics (Mosk. Energ. Inst., Moscow, 2010, 3rd ed.; Hemisphere, New York, 1992, 2nd ed.).

  4. REFPROP 10.0: Standard Reference Data, NIST. Reference Fluid Thermodynamic and Transport Properties (U. S. Secretary of Commerce, 2018).

  5. K. I. Kuznetsov, A. A. Sukhikh, S. V. Skorodumov, and P. P. Granchenko, Study of the Thermophysical Properties of the Working Substances of Energy: A Workshop on the Courses “Thermodynamics” and “Technical Thermodynamics” (Mosk. Energ. Inst., Moscow, 2019) [in Russian].

  6. P. P. Granchenko, K. I. Kuznetsov, A. A. Sukhikh, S. V. Skorodumov, A. V. Arkhiptsev, and R. I. Basidov, “Ultrasound velocity in the liquid and supercritical region of fluorocarbon substances,” Energosberezhenie Vodopodgot., No. 1, 45–50 (2019).

Download references

Funding

The reported study was funded by RFBR according to the research project no. 17-08-00983.

Author information

Authors and Affiliations

Authors

Corresponding authors

Correspondence to K. I. Kuznetsov, A. A. Sukhikh or P. P. Granchenko.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kuznetsov, K.I., Sukhikh, A.A., Granchenko, P.P. et al. Calculation Technique of Some Thermodynamic Functions using the Results of Joint Thermal and Acoustic Measurements. Therm. Eng. 67, 355–359 (2020). https://doi.org/10.1134/S0040601520060075

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0040601520060075

Keywords:

Navigation