[1] Peng Changhai, Wu Zhishen, Chen Zhenqian, et al. Decay rates and time lags of heat conductionin building construction under field conditions [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 249-253. [doi:10.3969/j.issn.1003-7985.2010.02.023]

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Decay rates and time lags of heat conductionin building construction under field conditions()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 2

Page:

249-253

Research Field:

Architecture

Publishing date:

2010-06-30

Info

Title:

Decay rates and time lags of heat conductionin building construction under field conditions

Author(s):

Peng Changhai¹;  2;  Wu Zhishen¹;  Chen Zhenqian¹;  Li Min¹

¹ International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China
² Key Laboratory of Urban and Architectural Heritage Conservation of Ministry of Education, Southeast University, Nanjing 210096, China

Keywords:

decay rates;  time lags;  heat conduction;  building construction;  field

PACS:

TU111

DOI:

10.3969/j.issn.1003-7985.2010.02.023

Abstract:

The field measurements of decay rates and time lags of heat conduction in a building construction taken in Nanjing during the summer of 2001 are presented.The decay rates and time lags are calculated according to the frequency responses of the heat absorbed by the room’s internal surfaces, inside surface temperature, indoor air temperature and outdoor synthetic temperature.The measured results match very well with the theoretical results of the zeroth and the first order values of the decay rates and time lags of heat conduction in the building construction, but the difference between the measured values and the theoretical values for the second order is too great to be accepted.It is therefore difficult to accurately test the second order value.However, it is still advisable to complete the analysis using the zeroth- and the first-orders values of the decay rates and time lags of heat conduction in building construction under field conditions, because in these cases the decay rates of heat conduction reach twenty which meets the requirements of engineering plans.

References:

[1] International Organization for Standardization.ISO 8301 Thermal insulation—determination of steady-state thermal resistance and related properties—heat flow meter apparatus [S].Geneva, Switzerland:ISO, 1991.
[2] International Organization for Standardization.ISO 8302 Thermal insulation—determination of steady-state thermal resistance and related properties—guarded hot plate apparatus [S].Geneva, Switzerland:ISO, 1991.
[3] International Organization for Standardization.ISO 8990 Thermal insulation—determination of steady-state thermal resistance and related properties—calibrated and guarded hot box[S].Geneva, Switzerland:ISO, 1994.
[4] British Standards Institution.BS EN ISO 8990 Thermal insulation—determination of steady-state thermal transmission properties—calibrated and guarded hot box [S].London, England:BS EN ISO, 1996.
[5] British Standards Institution.BS EN ISO 6946 Building components and building elements—thermal resistance and thermal transmittance—calculation method[S].London, England:BS EN ISO, 1997.
[6] British Standards Institution.BS EN 12667 Thermal resistance of building materials and products-determination of thermal resistance by means of guarded hot plate and heat flow meter methods—products of high and medium thermal resistance[S].London, England:BS EN ISO, 2001.
[7] American Society for Testing and Materials.ASTM C1199-00 Test method for measuring the steady-state thermal transmittance of fenestration systems using hot box methods[S].Philadelphia, USA:ASTM, 2000.
[8] American Society for Testing and Materials.ASTM C518-04 Test method for steady-state thermal transmission properties by means of the heat flow meter apparatus[S].Philadelphia, USA:ASTM, 2004.
[9] Laurenti L, Marcotullio F, Monte F D.Determination of the thermal resistance of walls through a dynamic analysis of in-situ data [J].International Journal of Thermal Sciences, 2004, 43(3):297-306.
[10] International Organization for Standardization.ISO 9869 Thermal insulation—building elements—in-situ measurement of thermal resistance and thermal transmittance [S].Geneva, Switzerland.1994.
[11] Peng C H, Wu Z S.Thermoelectricity analogy method for computing the periodic heat transfer in external building envelopes [J].Applied Energy, 2008, 85(8):735-754.

Memo

Memo:

Biography: Peng Changhai(1970—), male, doctor, associate professor, pengchanghai1@yahoo.com.cn.
Foundation items: The Advance Research Projects of Southeast University for the National Natural Science Foundation of China(No.XJ0701262), the National Key Technologies R&D Program of China during the 11th Five-Year Plan Period(No.2008BAJ12B04, 2008BAJ12B05, 2006BAJ03A04).
Citation: Peng Changhai, Wu Zhishen, Chen Zhenqian, et al.Decay rates and time lags of heat conduction in building construction under field conditions[J].Journal of Southeast University(English Edition), 2010, 26(2):249-253.

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