The Influence of Thermal Inertia Index on the Residential External Walls in Hot-Summer and Cold-Winter Areas

Abstract:

The evaluation method of residential building envelope thermal performance in hot-summer and cold-winter area is different from the method of the cold northern regions, that is, the merit of the thermal performance of walls and roofs should not be determined only by the heat transfer coefficient K or thermal resistance R, the impact of the thermal inertia index on the thermal performance of building envelope should also be considered. The analysis results show that, with the different values of thermal inertia index D, the difference of residential summer air-conditioning power consumption is not big, but the difference of residential winter heating power consumption is bigger, therefore, the high thermal inert wall is more conductive to reduce the winter heating power consumption than the low thermal inert wall.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 562-565
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.562
• Online since: August 2013
• Authors: Min Xiao, Guo Qiang Zhang
• Keywords: Research on the Influence, Residential External Walls, Thermal Inertia Index

References

[1] Under the same conditions as the heat transfer coefficient K value, the external walls of a different material and thickness, will produce different thermal inertia index D value to result in the different annual power consumption of the air conditioning and heating within the same residence. It can be seen that the assessment of the thermal performance of the building envelope can not only rely on heat transfer coefficient K value, we should also consider the effects of thermal inertia index.

[2] When the thermal inertia index D is different, the maximum difference of residential annual power consumption of the air conditioning in summer is 1.22%, the low thermal inert wall is slightly lower than the high inert wall.

[3] When the thermal inertia index D is different, the maximum difference of residential annual power consumption of the heating in winter is 23.8%, the high thermal inert wall is more conducive to reducing the annual power consumption of winter heating. Acknowledgements This work was financially supported by the Hunan Building Science and Technology Projects (KY201205).