U-Value Measurement Instrument
regarding several requests we decided to put an extra website
online, which concentrates only on U-value measurements.
Just click on the following link:
What is a U-Value?
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.
How do I get the U-Value of a building element?
Today, the U-Value of a building element is determined using one of these four approaches:
- Heat Flux Method or U-Value Measurement
This approach uses a Heat Flux Sensor and two temperature sensors. 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.
- 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.
- Multiple Temperature Measurements
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.
- Table Look-up (Building Catalog)
There are complex databases containing U-Values of generic building elements ordered by element material and year of construction. With these databases, the U-Value of a specific element 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 approximations.
How does a U-Value Measurement with the Heat Flux Method work?
The following simplified description illustrates how straightforward a U-Value Measurement can be performed by the U-Value Kit.
- Choose an optimal measurement spot on the building element of interest.
- On the inside of this spot, place the heat flux sensor and one temperature sensor.
- On the outside of this spot, place the second temperature sensor.
- Connect all three sensors to the data logging unit.
- Start the measurement process (via your PC).
- Evaluate the U-Value of the wall element in the PC software included in the U-Value Kit.
If you are interested in a more detailed description, please download the Application note (on the right hand side).
“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
Get the application note about U-Value Measurement for free. Provide your email address and get instant access (no activation required).
Easy to transport
The U-Value KIT easily fits into our solid transportation box.
Easy to mount
You can use normal adhesive tape to fix our sensors to any wall / window
You can review measurement protocols and graphs in real-time on your laptop.
If you do not need to follow ISO guidelines, you can measure U-Values also in less than an hour.