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U-value measurement

In the field of building physics, U-Value is the term used to describe the heat transfer coefficient of a building element (e.g. of a wall). The U-Value describes the insulation quality of a building. The unit of the U-Value is W/(m²K). The smaller the U-Value, the better the insulation quality of the building element.

But how to measure the U-value? Our measurement-approach uses a Heat Flux Sensor and two temperature sensors (see image below). This approach is standardized in ISO 9869, ASTM C1046 and ASTM C1155. This is the only method which delivers reliable quantitative in-situ information about a building envelope.

Read about a U-Value measurement with our gSKIN® U-Value KIT in a case study from ETH Zurich.

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greenTEG's U-value measurement device gSKIN U-Value Kit

To differentiate our measurement-approach from other often applied approaches we reviewed the most common ones:

  1. Table Look-up (Building Catalogue)/ U-Value Calculation
    There are complex databases containing λ-Values of generic building elements ordered by element material and/or year of construction. With these databases, the U-value of a building envelope (e.g. wall) is calculated by adding all materials contained within the specific element (e.g. specific wall = 20cm concrete + 20cm glass wool). While this method is very simple and quick, it does not produce an accurate U-Value, only an approximation.
  2. Thermography (i.e. Infrared imaging)
    This approach shows the thermal radiation of an object and produces an image showing spots with higher and lower radiation. It does not produce a U-Value, it just produces an image.
  3. Multiple Temperature Measurement
    This approach is based on three or more temperature measurements on both inside and outside of a building element. While this approach produces a U-Value, it needs a minimum temperature difference of 10 °C between the inside and outside to work and it is assumend that the thermal boundary resistance is constant.

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Key Features


gSKIN Heat Flux sensor mounted for U-Value measurement

Easy to mount

You can use normal adhesive tape to fix our sensor to any wall or window.

Measuring U-values with the gSKIN U-Value Kit

Easy to transport

The U-value Kit can easily be carried in our transportation box.

U-value measurement tool, real-time analysis

Real-time review

You can review measurement protocols easily on your laptop.


Short u-Value measurements with the gSKIN U-Value Kit

Short measurement

If you do not need to follow ISO guidelines, you can measure U-Values in less than an hour.

greenTEG U-value software (U-value calculator)

Easy analysis

A professional, easily understood software is provided

U-value determination or heat flux measurement in Research and Development (e.g. wearable)

Many applications

The U-Value Kit / Sensors can be applied within R&D applications to e.g. improve insulation of materials, etc.



Applications

Typical application areas include measurement of building insulation, windows, and various industry driven R&D fields.


Thermal energy enters buildings mainly from the heating system and from solar irradiation. The energy exchange between the building and the outside is focused through the roof, walls, windows, and thermal bridges e.g. balconies, into the soil, and through exchange of ambient air. Every building is a complex thermal system and to optimize these systems (for example to reduce heating costs), precise data is required.

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As the measurement set up for glass differs due its low thermal capacity to the influence of radiation for opaque materials. Our U-Value-Kit can also be easily installed to measure the U-Value of windows.

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Understanding the thermal environment within R&D activities is often important.

While in many R&D applications temperature sensors are sufficient to establish an accurate understanding of the thermal environment, it is not always the case. When deeper insight into thermal processes is required, heat flux measurements provide the needed data. For example, heat flux is important to measure for the understanding and optimization of PCMs and other thermal storage materials.

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How to measure the U-value? 6 Steps to get started


How to measure the U-value Step 1: Optimal measurement spot for U-value determination

Choose an optimal measurement spot on the building element of interest.

How to measure the U-value Step 2: gSKIN heat flux sensor by greenTEG AG during an U-value measurement

On the inside of this spot, place the heat flux sensor, and one temperature sensor.

How to measure the U-value Step 3: Outside U-value measurement with greenTEG's U-Value Kit

On the outside of this spot, place the second temperature sensor.


How to measure the U-value Step 4: The gSKIN U-Value Kit is a plug and play solution for U-value determination

Connect all three sensors to the data logging unit.

How to measure the U-value Step 5: Start the U-value measurement via the greenTEG software tool

Start the measurement process (via your Laptop).


How to measure the U-value Step 6: Successful U-value measurement shown in a report

Evaluate the U-value of the wall element with the software included .


Voices from customers



  • „The precise measurement with the gSKIN® U-Value KIT, which was developed by greenTEG according ISO 9869, is the base of our energy– and emission potential analysis – a benefit which is valued by our customers.”


    – Dr. René Salzmann, Owner and Partner,www.livingwoods.net
    Energy consultant Livingwoods uses greenTEG gSKIN U-Value Kit

  • „greenTEG’s U-Value KIT is an excellent toolset which can be used to determine the U-values of building elements with unknown thermal characteristics – we are using it for our teaching and research activities.”


    – Dr. Zoltán Nagy,
    Architecture and Building Systems, ETH Zürich
    ETH Zurich doing U-value measurements with greenTEG U-Value Kit

  • „The U-Value Kit has helped us to a great extent in our in-situ measurements of insulation materials. We used the sensor to determine the U-Values of various wall composites.“


    – Prof. W. D. Constant
    Louisiana State University
    Louisiana State University conducts U-value calculations with greenTEG's U-Value Kit

  • „The tiny greenTEG data-logger which weights almost nothing and the small sized sensors are the ideal tool for on-site measurements and experiments. We value much that not having any display nor navigation buttons the set does not attract attention nor offers any opportunity to manipulate. The light weight allows to stick it almost anywhere. Well done greenTEG!“


    – Ladislav Piršel, Executive Manager,
    alocons spol. s r.o.
    Swiss Energy Consultant uses greenTEG U-Value Measurement device the gSKIN U-Value Kit

  • „We were able to convince ourselves that we can gain confidence by actual and accurate measurements of the insulation quality of a wall or a window with the gSKIN sensor.
    For example: The owner of the object gains confidence in the planning, if it has actual and reliable data on which he or she can rely now.“


    – Martial Bujard, Director,
    Bureau EHE SA
    Swiss Energy Consultant uses greenTEG U-Value Calculator the gSKIN U-Value Kit

  • „Experiences from the field show that the use of theoretical values of thermal conductivity in the calculation of the capacity needs of demand-dependent heating systems is unreliable. Measurements with greenTEG’s gSKIN (R) U-value KIT enable us to determine actual values for our projects, making our calculations much more precise, resulting in a saving of material and resources.“


    – G.J. Louppen,
    ecodynamisch Bouwen
    Dutch Energy Consultant uses greenTEG U-Value Calculator the gSKIN U-Value Kit

Shop

Buy the U Value Kit, Heat-Flux Sensors and our other products online

Detailed information about the U-Value Kit is available in our online shop.

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Distributors

Europe

Thermalplug SPRL

Hermesstraat 2C
B/ 1930 Zaventem
Tel: +32 (0)2 711 20 32
GSM: +32 (0)474 487 486
info@thermalplug.be
www.thermalplug.com

Zero Energy Lab
Calle Mesnadas 9
09003 Burgos
info@zelab.com
www.zelab.es
You want to be our Distributor for the U-Value Kit or our other products in your region?

Contact us via email otelephone.

HDI Electronics SAS
48 rue Claude Balbastre, Bâtiment Camargue – Entrée n°4
34070 Montpellier – France
+33 (0) 499 532 005
www.hdi-electronics.com/
Sibalco AG
Birmannsgasse 8
Postfach CH-4055 Basel
+41 61 264 10 10
info@sibalco.ch
www.sibalco.ch
Klimagriff GmbH
Grünewalder Str. 29-31
42657 Solingen
Tel: +49 212 2494 586
info@schimmelprotektor.de
www.schimmelprotektor.de
Omni Instruments

Mid Craigie Rd, Dundee,
Dundee City DD4, GB
+44 845 900 0601
info@omni.uk.com
www.omniinstruments.co.uk/

South Survey Ltd
21 Deanfield Court
Clitheroe, Lancashire, UK
BB7 1QS
+441200 429870
sales@southsurvey.co.uk
www.surveyorsequipment.co.uk

Asia

TecFront Electronics Corporation
Room 2615,
Jingming Center No. 278 East Wenshui Road
Shanghai
info@tecfront.com
www.tecfront.com
You want to be our Distributor for the U-Value Kit or our other products in your region?

Contact us via email otelephone.

Sensortechnos Inc.
3-24-17 Nishiazabu Kasumi Building
4F Minato-ku
Tokyo 106-0031
www.senstech.jp
Dymstec
R1308 Kranztechno.
388 Dunchondaero, Joongwon-gu Seongnam-city,
Gyunggi-do Korea 462-729
www.dymstec.com

America

Electro Optical Components
5460 Skylane Blvd
Santa Rosa, CA 95403, USA
+1 707-568-1642
www.eoc-inc.com
You want to be our Distributor for the U-Value Kit or our other products in your region?

Contact us via email otelephone.

Middle East

WaldyTech Ltd.
27 Maskit St. P.O.Box 12011
Herzliya-Pituach 46733
+972-9-9573649
info@waldytech.com
www.waldytech.com
You want to be our Distributor for the U-Value Kit or our other products in your region?

Contact us via email otelephone.


Learn more about measurement vs. calculation


Download the U-Value Kit Software

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News and Publications

Exhibition partner opens zero-energy multi-family home

Our exhibition partner, the environmental arena Spreitenbach, opened the first multi-family house in the world that operates without external connection to electricity, oil and natural gas.
Visit the Umwelt Arena in Spreitenbach and experience our U-value kit in a live demonstration. Read more about the energy-independent house and our U-value kit.

U-value Measurement gSKIN for zero energy building

U-value Software: Bug fixes

We updated the software (V1.01.06) for the U-Value Kit. If you already have an U-Value Kit in use, you can download the software
here.
The access password to the software is still the same.
If you need support, please drop us an email
U-Value Measurement vs. U-Value calculation by greenTEG in Climate Control Middle East/ Climate control ME

Archive

Video: How the measure the U-value? Youtube
Article: Quality of building insulation precisely measured Precise U-Value Measurement instead of U-Value calculation in the USA ccr-mag.com
Article: The imprtance of U-values of windows U-Value Measurement vs. U-Value calculation by greenTEG in Climate Control Middle East/ Climate control ME futurebuild.com
Article: U-Value assessment – getting value for money U-Value Measurement vs. U-Value calculation by greenTEG in Climate Control Middle East/ Climate control ME Climate Control ME
Upcoming book: Reference to U-Value Kit Energy Audits and Improvements for Commercial Buildings - Ian M. Shapirg wiley.com
R-value vs. U-value U-Value and R-value, explained by greenTEG greenteg.com

List of Energy Consultants in certain regions

You are searching for information about local Building Energy Experts? Find information here.

Germany
KFW – List of Energy Consultants
Federal Minsitry of Energy – List of Energy Efficiency Experts

beraterboerse.kfw.de

energie-effizienz-experten.de
Switzerland
Geak – List of Energy Experts

geak.ch
United States of America
BPI Goldstar Contractor

bpihomeowner.org
United Arab Emirates
Dubai – Green Building Consultants
ehss.ae


About

greenTEG develops, manufactures, and markets thermal sensor solutions. The company was founded in 2009 as an ETH Zurich spin-off and has since built up an international customer base, coupled with a global distributor network.

greenTEG’s thermal sensors are integrated into diverse applications by customers active in markets such as laser, building technologies, medtech, automotive, processing industry, and R&D.

Contact us or our distributors and tell us about your application ideas. We will support you to find the best solution for your requirements.More information about the company and its technology can be found on their website.

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Our partnerships and recognition

BFE supported us in technical research about specific questions during the development of our technology.

We are CTI certified since 2010.

Climate KIC cooperates with greenTEG at exhibiting the gSKIN U-value Kit at Umweltarena Spreitenbach. Where a live in-situ u-value measurement is showngreenTEG's U-Value Kit is shown in a live demonstration at Umweltarena Spreitenbach

Our technology of the U-Value Kit is presented in cooperation with Climate KIC at the Umweltarena in Spreitenbach.