Commissioning of thermal performance of prefabricated timber frame insulation elements for nZEB renovation

Peep Pihelo,Targo Kalamees,R Černý,V Kočí,J Kočí

doi:10.1051/matecconf/201928202004

Abstract

The current study contains a commissioning of thermal performance of highly insulated building envelope, located in cold and humid Estonian climate. The focus is on the renovation of old apartment building to nearly-zero energy building with prefabricated timber frame insulation elements with designed thermal transmittances U=0.10-0.12 W/(m2∙K). Air tightness, heat flux and temperatures were measured after renovation. Results of commissioning are showing some deviations from designed values, possibly caused by internal convection, improper tightening of joints of elements and poor quality of sealing of layers which must be kept airtight. The results have shown that analysis of designed solutions before, during and after renovation is worthwhile. Thorough inspection and strict rules of quality control on work site are essential for high-quality, sustainable outcomes of renovation with timber frame insulation elements and to guarantee designed thermal performance.

Highlights

To decrease energy use, EU member states shall establish a long-term renovation strategy to decarbonised building stock by 2050 [1]
Comparison of measured real energy use and energy use predicted by calculations have shown that the energy performance gap is larger for more energy efficient buildings [3]
The designed values and measurement results of thermal transmittance are shown in Fig. 3

Summary

Introduction

EU member states shall establish a long-term renovation strategy to decarbonised building stock by 2050 [1]. This requires increasing requirements on energy performance of new and existing buildings. Comparison of measured real energy use and energy use predicted by calculations have shown that the energy performance gap is larger for more energy efficient buildings [3]. This could be partly caused by user behaviour [4,5]. An innovative way of renovation is the application of prefabricated renovation elements which has the potential to reduce costs and renovation time, to lower disturbance for occupants and enhance quality and performance in terms of energy efficiency and indoor climate [8,9,10]

Methods

Results

Discussion

Conclusion