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21 Cards in this Set
- Front
- Back
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What is oxygen permeation? |
The ability of oxygen to pass through material due to the materials molecular structure and difference in oxygen pressure on each side |
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How does forced air heating work? |
Forces warmed air through the space by means of a blower and large duct |
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How does finned baseboard heating heat a room? |
By means of convection as its primary means, but also uses conduction and radiation as well |
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What are the most recognized advantages of radiant floor heating over forced air? |
-Lower temperature stratification - minimal air movement - higher surface temperature of objects in the room |
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What are the 4 ways the body releases heat? |
Evaporation, convection, conduction, radiation |
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What is stratification? |
The temperature of the air in a room at different heights |
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What is the cold 70s? |
Heat being robbed from the body by cooler surfaces and objects around you |
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Where do you want to avoid running infloor heating tubes? |
Under cabinets, pantries, fridge, freezers, and close to toilet flanges |
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Why is room temperature setback thermostats not recommended for in floor heating? |
Slow response time on in floor heating. It takes to long for the room to cool downs |
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What are the main disadvantages of radiant floor heating? |
Initial costs, building structure, room temperature set back, air filtration and humidifcation, air exchangers |
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What are the 3 categories of tubing used in radiant heating systems? |
- metallic (copper) -synthetic (cross-linked polyethylene (pex)) -composite (combined) |
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What is the purpose of black pex tubing? |
It is UV protected from direct sunlight. |
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What is the maximum length for 3/8” ID tubing used in a radiant heating system? |
76m (250’) |
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What is the maximum length for 1/2” ID tubing used in a radiant heating system? |
91m (300’) |
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What is the maximum length for 3/4” ID tubing used in a radiant heating system? |
152m (500’) |
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What are manifolds commonly made from? |
Copper, Brass, and Plastic |
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What is the purpose of a balancing valve on a radiant heating manifold? |
To ensure equal flow rate to each circuit. |
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When is a balancing valve not required? |
If there is less than 10% difference in length between the longest and shortest circuit connected to a common manifold. |
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What is the maximum floor surface temperature for bathrooms, indoor swimming pools and foyers? |
33C (91F) |
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What does mean water temperature mean? |
The average water temperature in the line. (Goes in at 110F and exits at 100F, the average is 105F) |
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Who or what determines indoor design temperature? |
Building code for the minimum, and occupants for desired room temp. |
