Application of Double-Sided Heat Flow Meter in Testing of Overall Heat Transfer Coefficient of Building Envelope

2013 ◽  
Vol 353-356 ◽  
pp. 2872-2876
Author(s):  
Hai Rong Dong ◽  
Shao Ming Qi
Keyword(s):  
Heat Flow ◽  
Thermal Property ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Field Testing ◽  
Building Envelope ◽  
Existing Buildings ◽  
Flow Meter ◽  
Thermal Transfer ◽  
Heat Flow Meter

It is essential to find out the thermal property of building envelope in order to design economical and reasonable scheme of energy-saving reconstruction. Field testing is a method of receiving the thermal property of envelope when existing buildings are reconstructed. In this paper, we focus on the need for obtaining the thermal transfer coefficient. A methoddouble-sided heat flow meter was introduced and used to test the thermal property of wall. The testing results show that it provides a feasible method for colleting basal data of energy-saving reconstruction of existing buildings.

Difference between the Measured and Theoretical Value and Theirs Influencing Factors for Heat Transfer Coefficient of Exterior Wall External Insulation

2011 ◽  
Vol 415-417 ◽  
pp. 1427-1430
Author(s):  
Yu Lan Tian ◽  
Jian Min Lu ◽  
Wen Yan Zhang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Flow ◽  
Transfer Coefficient ◽  
Exterior Wall ◽  
Flow Meter ◽  
External Insulation ◽  
Temperature Controlled ◽  
The Heat Transfer Coefficient ◽  
Heat Flow Meter

This paper analyzed the actual heat transfer coefficient of exterior wall external insulation, which was detected by temperature controlled hot box-heat flow meter method in Nanjing from March to December, 2010 .Research showed that: impacted by one-dimensional stability heat transfer assumption ,78.27% of test values of the heat transfer coefficient for exterior wall external insulation , are less than the calculated values; under certain circumstance, that the external thermal insulation material(Expandable polystyrene shutter, EPS board for short, and Extruded polystyrene shutter, XPS board for short)are the same, the more stable the wall substrate density and material , the greater the heat storage coefficient is and the smaller the relative detection error will be. When using the same stable wall substrate material, the calculation error of XPS board was significantly better than EPS board’s. The analysis, which is about error influence factors of test value of the heat transfer coefficient of exterior wall external insulation, shows that current temperature controlled hot box-heat flow meter heat transfer coefficient method needs further improved and perfect in order to improve the reliability of its conclusion.

Fly Ash Autoclaved Aerated Concrete Field Detection Analysis of Heat Transfer Coefficient of Self Thermal Insulation Building Envelope

2014 ◽  
Vol 631-632 ◽  
pp. 585-589
Author(s):  
Li Bai ◽  
Meng Niu ◽  
Ying Li
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Fly Ash ◽  
Heat Flow ◽  
Transfer Coefficient ◽  
Building Envelope ◽  
Aerated Concrete ◽  
Temperature Controlled ◽  
The Heat Transfer Coefficient ◽  
Heat Flow Meter

This paper mainly analyzes the principle and application conditions of temperature controlled tank-heat flow meter method in field testing the heat transfer coefficient. And according to the actual engineering examples, using temperature controlled tank-heat flow meter method to test the heat transfer coefficient of fly ash autoclaved aerated concrete building envelope. Analyzing and studying the testing data, design value and theoretical calculating value.

scholarly journals ALTERNATIVE METHOD FOR ON SITE EVALUATION OF THERMAL TRANSMITTANCE

2017 ◽  
Vol 15 (2) ◽  
pp. 341 ◽  
Author(s):  
Aleksandar Janković ◽  
Biljana Antunović ◽  
Ljubiša Preradović
Keyword(s):  
Heat Flow ◽  
Thermal Characteristics ◽  
Building Envelope ◽  
Heat Losses ◽  
Flow Meter ◽  
Simple Method ◽  
Building Element ◽  
Thermal Transmittance ◽  
Heat Flow Meter

Thermal transmittance or U-value is an indicator of the building envelope thermal properties and a key parameter for evaluation of heat losses through the building elements due to heat transmission. It can be determined by calculation based on thermal characteristics of the building element layers. However, this value does not take into account the effects of irregularities and degradation of certain elements of the envelope caused by aging, which may lead to errors in calculation of the heat losses. An effective and simple method for determination of thermal transmittance is in situ measurement, which is governed by the ISO 9869-1:2014 that defines heat flow meter method. This relatively expensive method leaves marks and damages surface of the building element. Furthermore, the final result is not always reliable, in particular when the building element is light or when the weather conditions are not suitable. In order to avoid the above mentioned problems and to estimate the real thermal transmittance value an alternative experimental method, here referred as the natural convection and radiation method, is proposed in this paper. For determination of thermal transmittance, this method requires only temperatures of inside and outside air, as well as the inner wall surface temperature. A detailed statistical analysis, performed by the software package SPSS ver. 20, shows several more advantages of this method comparing to the standard heat flow meter one, besides economic and non-destructive benefits.

Experimental Study on Heat Transfer Coefficient for Foam Glass Exterior Thermal Insulation Wall

2011 ◽  
Vol 71-78 ◽  
pp. 976-980
Author(s):  
Yi Ying Luo ◽  
Xue Bin Yang ◽  
Zong Min Yu ◽  
Hou Ren Xiong ◽  
Hai Bin Jiang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Flow ◽  
Transfer Coefficient ◽  
Thermal Insulation ◽  
Foam Glass ◽  
Performance Testing ◽  
Testing Instrument ◽  
Flow Meter ◽  
Heat Flow Meter

The heat transfer coefficients of two foam glass exterior thermal insulation walls were tested by weather-resistant testing instrument and heat flow meter. The experimental values were compared with the theoretical values. The results show that with the temperature differences Δt>20 °C, the testing errors of two walls are smaller than 1% and 3% respectively. In view of thermal performance, testing accuracy and operability, the test program is practicable to meet the testing requirement with a temperature difference greater than 20 °C and without seasonal restrictions. In the zones without heating such as hot summer and cold winter zone, therefore, the weather-resistant testing instrument (i.e. temperature control box) and heat flow meter can be used to test the heat transfer coefficient of a wall.

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