scholarly journals Comparison between Heat Flow Meter (HFM) and Thermometric (THM) Method for Building Wall Thermal Characterization: Latest Advances and Critical Review

2022 ◽  
Vol 14 (2) ◽  
pp. 693
Author(s):  
Luca Evangelisti ◽  
Andrea Scorza ◽  
Roberto De Lieto Vollaro ◽  
Salvatore Andrea Sciuto
Keyword(s):  
Heat Flow ◽  
Critical Review ◽  
Thermal Conditions ◽  
Thermal Characterization ◽  
Flow Meter ◽  
Scientific Papers ◽  
Building Wall ◽  
Building Components ◽  
Heat Flow Meter

It is well-known that on-site measurements are suitable for verifying the actual thermal performance of buildings. Performance assessed in situ, under actual thermal conditions, can substantially vary from the theoretical values. Therefore, experimental measurements are essential for better comprehending the thermal behavior of building components, by applying measurement systems and methods suitable to acquire data related to temperatures, heat flows and air speeds both related to the internal and external environments. These data can then be processed to compute performance indicators, such as the well-known thermal transmittance (U-value). This review aims at focusing on two experimental techniques: the widely used and standardized heat flow meter (HFM) method and the quite new thermometric (THM) method. Several scientific papers were analyzed to provide an overview on the latest advances related to these techniques, thus providing a focused critical review. This paper aims to be a valuable resource for academics and practitioners as it covers basic theory, in situ measurement equipment and criteria for sensor installation, errors, and new data post-processing methods.

scholarly journals Quality Control of the Thermal Properties of Superstructures in Accommodation Spaces in Naval Constructions

2020 ◽  
Vol 12 (10) ◽  
pp. 4194
Author(s):  
David Bienvenido-Huertas ◽  
Juan Moyano ◽  
Carlos E. Rodríguez-Jiménez ◽  
Aurelio Muñoz-Rubio ◽  
Francisco Javier Bermúdez Rodríguez
Keyword(s):  
Quality Control ◽  
Heat Flow ◽  
Energy Demand ◽  
Scientific Literature ◽  
Thermal Characterization ◽  
Design Strategies ◽  
Flow Meter ◽  
Air Conditioning Systems ◽  
Heat Flow Meter

The application of passive design strategies in ships, such as the use of superstructures with high thermal insulation, allows the energy demand of heating, ventilation, and air conditioning systems to be reduced. There is a knowledge gap in the scientific literature on the possibilities to thermally characterize superstructures. Knowing such possibilities would make a methodology available for the quality control of naval constructions and for the inspection of the appropriate state of insulations in existing ships. For this purpose, a total of three different typologies of ship superstructures were monitored, and the data obtained were analyzed by using various existing approaches for the thermal characterization of façades: the heat flow meter method and temperature measurement methods. The results showed that the heat flow meter method constitutes a valid methodology to obtain representative results. In addition, guaranteeing a thermal gradient dependent of the wall typology and placing probes in zones not influenced by thermal bridges ensure that representative results are achieved.

scholarly journals Influence of HFM Thermal Contact on the Accuracy of In Situ Measurements of Façades’ U-Value in Operational Stage

2021 ◽  
Vol 11 (3) ◽  
pp. 979
Author(s):  
Katia Gaspar ◽  
Miquel Casals ◽  
Marta Gangolells
Keyword(s):  
Heat Flow ◽  
Thermal Contact ◽  
Accurate Information ◽  
Wall Surface ◽  
Flow Meter ◽  
Usual Procedure ◽  
Pvc Film ◽  
U Value ◽  
Heat Flow Meter

Accurate information on the actual thermal transmittance of walls is vital to select appropriate energy-saving measures in existing buildings to meet the commitments of the European Green Deal. To obtain accurate results using the heat flow meter (HFM) method, good thermal contact must be made between the heat flow meter plate and the wall surface. This paper aimed to assess the influence of the non-perfect thermal contact of heat flow meter plates on the accuracy of in situ measurement of the façades’ U-value when a film was applied to avoid damage to the wall surface. Given the fact that to avoid harm to the wall surface, the laying of a film is a usual procedure in the installation of equipment during the building’s operational stage. The findings show that deviations between measured U-values when an HFM was installed directly on the wall surface and when an HFM was installed with a PVC film were found to differ significantly from the theoretical effect of including a PVC film during the monitoring process.

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