U-value measurement case studies, application examples and other resources

 

Below you will find case studies, white papers and other resources about U-value measurements with the gO Measurement System and the U-Value Kit.

Measurements with these systems enable you to answer questions like:

  • Does a building deserver its quality label (Minergie)?
  • Are the walls insulated according to the latest standards?
  • Should the windows be replaced to increase the building's overall energy efficiency?
  • Is the roof well enough insulated?Are heat bridges the cause for mold growth?

Measurements with the gO System and the U-Value Kit generate quantitative data and enable you to make informed decisions. 

 

How to measure U-Values of Windows: An example

In this case study, we used the example of a house from the 1930s to show how you can measure U-values of windows easily and precisely, in little time, all year round with the gO Measurement-System from greenTEG.

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Comparison of U-value Measurement Systems

The different systems available to measure U-Values can be confusing. The following table compares different systems to help with decision making.
 

Reducing Energy Losses in Hot Climates – Two Cases from the Middle East

SIFS used the gO Measurement System for energy audits of an Arabian villa and of a reception hall in Kuwait. Here, you can get some impressions from their work and their results
 

Lafarge Holcim assessed the gO Measurement System

LafargeHolcim assessed greenTEG’s gO Measurement System (gOMS) in a  HotBox/ColdBox (HB/CB) experiment. The HB/CB is an industrial scale tool designed to test whole building elements such as walls in different artificially reproduced climatic conditions. 

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Ultra-high energy efficiency thermal building envelope characterized with greenTEG`s gO System

Researchers used greenTEG’s gO Measurement System (gOMS) to characterize an ultra-high energy efficiency thermal building envelope. This posed challenging measurement conditions for most U-value measurement systems due to very low thermal leakages and flows, which requires high-sensitivity heat flux sensing. However, greenTEG’s gOMS with its high-performance heat flux sensors was designed to tackle such measurement challenges.

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Heat transfer coefficient of a building element. Methods comparison.

The aim of this study conducted by students is to evaluate two different methods of measuring the thermal transmittance (U-Value) of a construction component. As an example, a wall of a refrigerator was taken. This measurement will bring the possibility to compare both methods, which will be carried out in stable conditions, inside the laboratory of the university. The U-Value will be measured with the two following methods:

  • Temperature Based Method carried out with model Testo 635
  • Heat Flux Method carried out with greenTEG’s gSKIN® U-Value Kit

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Challenges of performing a U-value measurement on a roof

This brief case study presents the challenges of performing a U-value measurement on a roof and the precautions and steps to overcome them. The challenges of measuring a very low U-value and the corresponding measurement quality assessment methods are also discussed. A potential solution, in the form of a U-value calculation algorithm, is then proposed to faster achieve ISO 9869 conformity.

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U-value and dewpoint assessment with the gO Measurement System

The purpose of this study is to measure the U-value, the temperature and the humidity levels (RH) of the interior of a single-family apartment to examine the influence of these factors to the formation of mold.

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U-Value Measurement for Building Standard Verification

In this case study, the u-value of different walls are measured to determine whether the contractor used substandard insulation materials in order to save costs. The measurement was commissioned by the homeowner to get the MINERGIE certification.

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Indicators of Insulation Quality: U-value and R-value explained

In order to describe the thermal performance of building elements professionals use R-values and U-values in the same context. Depending on the geographical location and governmental guidelines one or the other term is more popular. This article sums up the main similarities and differences.

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U-value measurement in an occupied building

In this case study we present u-value measurements performed in a building while the inhabitants were present. The results allow for an evaluation of the influence of temperature changes on the measurement.

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U-Value verification measurement of a Minergie-certified building with greenTEG’s gSKIN® U-Value Kit

The aim of this study is to verify if it is possible to exactly measure the U-Value of building envelopes certified by the Minergie-standard using the gSKIN® U-Value Kit.

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Study by the Swiss Federal Office of Energy about calculated and measured U-values

A newly developed device was used to measure the U-values of various wall types built before 1985. The goal was to assess the validity of the embedded U-values in the GEAK calculation model for typical walls that are due for a retrofit. It turns out that walls built before the first model energy codes were implemented (mid-70s) were much lower U-values than those found in the GEAK (only abstract in English)

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How heat escapes through the wall 

The heat transfer coefficient (U-value) is a key parameter for planners and builders. Recommendations for renovations proposed by energy consultants are often based on this value. Thanks to a novel method, the U-value of a wall, a roof or a window front can now be determined with a non-invasive method on site. The measurement method can be used to renovate of old buildings and buildings protected under historic presevation laws, a study co-financed by the Swiss Federal Office of Energy shows.

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Software tutorial with free test access to the cloud based-software

In this tutorial it is shown step by step how to analyze U-value and aw-Value measurements with the cloud-based online analysis tool. The tutorial is designed as such that it is possible to follow the steps directly at the computer, with the same measurement data, which are taken from a measurement at a camping fridge.

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Summary of ISO 9869

We summarized the content of the ISO 9869 norn.

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U-value and Mold Measurements on Heritage Buildings Using greenTEG`s gO-Measurement System

U- and aw-value measurements were carried out at the listed post-medieval Patrician mansion in Immenfeld in the canton of Schwyz. 

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Estimating the specific thermal capacity of building components

In a novel application case study, LemonConsult in Zurich used the gO-Measurement System to estimate the specific thermal capacity of building components per unit surface area.  

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