What is a low U-value?
The lower the U-value of an element of a building’s fabric, the more slowly heat is able to transmit through it, and so the better it performs as an insulator. Very broadly, the better (i.e. lower) the U-value of a building’s fabric, the less energy is required to maintain comfortable conditions inside the building.
What is the best U-value insulation?
The best insulating materials have a U-value of close to zero – the lower the better. Building regulations currently stipulate that for a new building, the elements must have maximum U-values as follows: Wall – 0.3 W/m2k. Roof – 0.15 W/m2k.
What is U-value and R-value?
R-Value is a measure of thermal resistance, or the ability of an object or material to resist the flow of heat. U-Value is a thermal transmittance, or the heat loss through a structural element.
What is the U-value of 100mm kingspan?
Product Application
| Product | R Value (mK/W) | U Value (W/m²K) |
|---|---|---|
| TP10 100mm | 4.30 | 0.23 |
| TP10 105mm | 4.55 | 0.22 |
| TP10 110mm | 4.75 | 0.21 |
| TP10 115mm | 5.00 | 0.20 |
Is lower U-value better?
The basics about U values? U-values measure how effective a material is an insulator. The lower the U-value is, the better the material is as a heat insulator.
Is a lower W m2K better?
It is the number of Watts per square metre of the construction, per degree of temperature difference between one side and the other (W/m2K). As a rule of thumb, the lower the U-value the better, because the complete construction transmits less heat energy.
What U-value does 50mm Celotex?
Technical Spec
| Product Code | Board dimensions (width) x (length) = (m²) | U-value (W/m²K) |
|---|---|---|
| Celotex CW4040 | 12×0.45×1.2 = 6.48m² | 0.56 |
| Celotex CW4045 | 11×0.45×1.2 = 5.94m² | 0.50 |
| Celotex CW4050 | 10×0.45×1.2 = 5.4m² | 0.44 |
| Celotex CW4060 | 8×0.45×1.2 = 4.32m² | 0.37 |
What is the U-value of concrete?
For example, a building with material with an “R” Value of R-11 converts to an “U” Value of 0.09 ( 1/R or 1/11 = 0.09)….U-Values for common materials.
| Cold Mass Specific Gravity | |
|---|---|
| Material | Specific Gravity |
| Cast Iron | 0.11 |
| Cement | 0.19 |
| Concrete (140# / ft3) | 0.16 |
What are the body mass index values for children and adolescents?
Body mass index values for children and adolescents aged 2–19 years by sex and age, by mean, standard error of the mean, and selcted percentiles: United States 2003–2006 Percentile Number Standard Sex and age 1 examined Mean error 5th 10th 15th 25th 50th 75th 85th 90th 95th Male Body mass index 2 years ………………. 258 16.8
What data is available for analysis of Child Health?
Data available for analysis include family and child demographics, and measures of child educational, social, economic, and physical well-being. The NSCH examines the physical and emotional health of children ages 0-17 years of age.
What is the difference between children and adults body measurement data?
children reflect general health status, dietary adequacy, and growth and development over time. In adults, body measurement data are used to evaluate health and dietary status, disease risk, and body composition changes that more occur over the adult lifespan.
What is America’s children?
The America’s Children series makes Federal data on children and families available in a nontechnical, easy-to-use format in order to stimulate discussion among data providers, policymakers, and the public. ICPSR offers more than 500,000 digital files containing social science research data.