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Justification of the resulting comfortable temperature parameter

DOI: 10.17586/1606-4313-2021-20-1-28-33
UDC 697.9

Justification of the resulting comfortable temperature parameter

Sankina J.N., Sulin A.B., Ryabova T.V. , Deymi-Dashtebayaz Mahdi, Lysyov V.I.

For citation: Sankina Iu.N., Sulin A.B., Ryabova T.V., Deymi-Dashtebayaz M., Lysev V.I. Justification of the resulting comfortable temperature parameter. Journal of International Academy of Refrigeration. 2021. No 1. p. 28-33. DOI: 10.17586/1606-4313-2021-20-1-28-33

Abstract
Heating, ventilation, and air conditioning professionals use thermal comfort indices to measure and compare thermal conditions. In this paper, indices of thermal comfort frequently used are given, and the parameter of the resulting temperature is refined using matrices of isocomfortable parameters which developed as a result of solving the problem of ensuring a given level of thermal comfort in accordance with the method proposed by P.O. Fanger and standardized in the ISO 7730 standard. The weight coefficients proposed by 30494-2011 State Standard were tested using the matrices of isocomfortable parameters. This article provides comparative tables and graphs, whcih prove that the weighting factors proposed by the international standard are not accurate enough. Based on the physical meaning of the parameter of the resulting temperature it was assumed that, for each value of air mobility, the same values of the resulting comfortable temperature were supposed to obtain. During the analysis of the data obtained, it was revealed that the standard deviation of the resulting comfortable temperature is a value of up to 0.5 ° C. This fact proves that more accurate weighting factors should be used to obtain more accurate comfort temperature results. As a result of the study, a new mathematical dependence was proposed and a new concept of the resulting comfortable temperature was introduced. The obtained mathematical dependence allows high accuracy in calculating the resulting comfortable temperature taking into account the comfortable combination of such parameters as air temperature and average radiation temperature, depending on the amount of air velocity in the room.

Keywords: resulting temperature, matrices of isocomfortable parameters, air velocity, comfortable parameters.

All references

1. ASHRAE 62 Ventilation for acceptable indoor air quality. ASHRAE Standard, ashrae.org, 621989. 1989.

2. Madsen T.L. Comparison between Operative and Equivalent Tempearture under Typical Indoor Conditions. ASHRAE trans. 1984. vol. 90. p. 1077-1090.

3. SAE J2234 Equivalent temperature. Surface Vehicle Information. 1993.

4. Nilsson H., Holmér I., Bohm M. & Norén O. Definition and Theoretical Background of the Equivalent Temperature. Int. ATA Conference. Florence, Italy. 1999A.

5. Bohm M. et al. Evaluation of the thermal environment in tractor cabs. International Conference on Environmental Ergonomics IV. 1990. p. 144-146.

6. Schwab R., Conrad W. & Mayer E. Correlation Between Objective and Subjective Measurements of Thermal Comfort. EQUIV Report No 4, Holtzkirchen, Germany, Fraunhofer-Institut für Bauphysik. 1999.

7. Houghten F. and Yagloglou C. Determining equal comfort lines. Journal of ASHVE, USA, 1923. vol. 29. Pp. 165-176.

8. Dufton A.F. The equivalent temperature of a warmed room. JIHVE. 1936. vol. 4. p. 227-229.

9. Zhang S., Lin Z. Standard effective temperature based adaptive-rational thermal comfort model. Applied Energy. 2020. vol. 264. p. 114723.

10. Missenard A. et al. On Thermally Equivalent Environments. Journal of the Institution of Heating and Ventilating Engineers. 1959. vol. 27. p. 231-237.

11. Vernon H. & Warner C. The influence of humidity of the air on capacity for work at high temperatures. Journal Hygiene Cambridge, UK, 1932. vol. 32. pp 431-462.

12. Menchaca-Brandan M.A., Espinosa F.A.D., Glicksman L.R. The influence of radiation heat transfer on the prediction of air flows in rooms under natural ventilation. Energy and buildings. 2017. vol. 138. p. 530-538.

13. State standard 30494-2011 Residential and public buildings. The parameters of the microclimate in the premises. Date of introduction 2013-01-01. (in Russian)

14. State standard R ISO 7730-2009 Ergonomics of the thermal environment. Analytical determination and interpretation of the comfort of the thermal regime using the calculation of PMV and PPD indicators and criteria for local thermal comfort. Date of introduction 2010-12-01. (in Russian)

15. Mohammad H. Hasan, Fadi Alsaleem, Mostafa Rafaie. Sensitivity study for the PMV thermal comfort model and the use of wearable devices biometric data for metabolic rate estimation. Building and Environment. 110 (2016) 173e183

Ryabova T.V., Sulin A.B., Sankina Yu.N. Rationale and calculation of thermal comfort equivalent parameters. Vestnik Mezhdunarodnoi akademii kholoda. 2018. No 2. p. 78-84.(in Russian)

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