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Compare conventional warm air to
Warm Air
Negative pressure at the perimeter of building allows for infiltration.
20% to 25% stack loss
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| High temperature or static pressure at the roof |
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| 90° |
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| line increases heat transfer through roof. | |||
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| The higher the bay area, the higher the static |
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| 120o and higher. |
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| pressure. | |
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| Because of air movement in the building | ||
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| Discharged air rises to roof line. |
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| space, thermostat must be set higher to |
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| 70° |
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| achieve comfort level. | |||
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| Cold floors in most cases are 10° less than | ||||
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| 60° |
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| thermostat setting. |
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Listed by CSA for vented or unvented application.
Low stack temperature 300°
Reradiation from concrete mass results in even temperature throughout the building.
70°
No air movement, but same comfort level, with lower thermostat setting.
65°
75°
No stacking effect; greatly reduces static pressure at the roof line, reducing costly infiltration.
With the comfort of warm floors, building is heated from floor up instead of from roof down.
Radiant Heat
What is infra-red and how does it work?
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| In addition to those rays |
| A portion of the ray’s energy | |||||||
divergent straight lines from |
| which travel directly from the |
| is absorbed by cooler receiving | ||||||
heat source to all surfaces |
| heat source, other rays are |
| surfaces. Conduction carries | ||||||
and objects without heating |
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| some of the heat deeper into | |||||||
the air they pass through. |
| mirror surfaced reflector. |
| the heated material creating | ||||||
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| a heat reservoir. | ||
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| The balance of the radiant |
| As a secondary effect, the |
| A part of the secondary ray | |||||
| heat is reflected from the |
| room temperature is raised |
| energy, now of longer wave | |||||
| heating surface to be |
| by convective transfer from |
| length, is absorbed by | |||||
| absorbed by surrounding |
| the heated surface. |
| moisture and particles in the | |||||
| cool surfaces. |
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| air, which helps to raise the | |||
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| temperature. | ||
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