Hello
According to the studies I had about the heat transfer coefficient (U-Value) of greenhouse glass, according to the standard, this value should be equal to 1.13 Btu/h.ft^2.F for single-paned glass, but this value is lower for construction glass. Does anyone have information and experience in this matter to know what kind of glass is this standard for greenhouse glass?
Thank you in advance for your time.
The quoted "U" values are no more than guidance. The only definite value for glass is its thermal conductivity. The "U" value is a composite of inside heat transfer coefficient, external heat transfer coefficient, glass radiant properties and glass conductivity. You may need to consult a text on heat transfer if these concepts are not known to you as there are many factors involved (local insolation, wind-speed, design of greenhouse etc.). The overall values in the literature are typical of some common situations, but the order of magnitude is right.
The U-value of greenhouse glass can vary based on its construction and design. Horticultural or greenhouse glass, which is typically made from soda-lime silica, is specifically engineered for greenhouse applications. It is designed to allow sunlight to pass through while trapping heat, creating a controlled and conducive environment for plant growth.To obtain the exact U-value for a specific type of greenhouse glass, it is essential to consult the manufacturer's specifications or contact the supplier directly, as these values can vary widely based on the product's specifications and design.
sincerely
I am familiar with the factors that affect electrical conductivity. What I mean by the question is whether building glass with electrical conductivity coefficient of about 1 is suitable for use in glass greenhouses, which is mentioned in the standard number of about 1.13?
If it is not suitable, what operation should we do on the glass to achieve this value?
Glass with an electrical conductivity coefficient of about 1 is considered to be a good electrical insulator. This means it does not conduct electricity effectively, making it safe for various applications, including in greenhouses. Greenhouse glass is typically designed to be a good insulator to prevent heat loss and maintain a stable environment for plants.
If you have glass with a higher electrical conductivity coefficient than the desired value of 1.13, it is not suitable for use in glass greenhouses. Using glass with higher electrical conductivity could pose safety risks, especially in environments where moisture is present, as it could lead to electrical hazards.
To achieve the desired electrical conductivity coefficient, you might consider using specialized coatings or treatments on the glass. One common method is applying a thin layer of indium tin oxide (ITO) coating. ITO is a transparent conductor that is often used in applications where both electrical conductivity and optical transparency are required, such as in electronic devices and solar panels.
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