Mar 22, 2017 And which heat loss(min) is convenient for less cost with good insulation. Example: thumb rule: Heat loss (W/m.) is good heat loss with minimum cost. (like this) # Above points are Not thumb rules. This all are my assumptions. Please provide the technical advice to me. Thank you and waiting for your reply. Rules of Thumb are general principles derived from practice and experience rather than precise theory. The 5th edition of Rules of Thumb has been created by referencing various contemporary sources in the building services industry and can reasonably be held to reflect current design practices. Calculating Heat Load from Lighting FixturesWhenever doing heat-load calculations, we must always count 100% of the fixture wattage-any fixture's wattage-as heat, regardless of efficiencies at the source. In any enclosed space, virtually all of the light produced by a lighting fixture is eventually absorbed by surrounding materials (walls, ceilings, etc.). When light gets absorbed by these materials, photons are converted into heat. New lighting technologies, such as LEDs, allow luminaires to produce light more efficiently, or with higher efficacy than incandescent lamps. This means that we get more lumens per watt; however, heat per watt is constant. What matters is that fewer watts are used to produce comparable brightness, not that these fixtures somehow produce less heat for the wattage that they consume. 1 watt of electricity used by a luminaire = 3.412 BTUs per hour The same math works for any lighting fixture. For average industrial heat-pump or electric air-conditioner types of HVAC equipment, it takes approximately 0.4 watts of cooling power to offset each 1 watt of power consumed by a light source. Smaller-scale HVAC systems might require more power than this, and certain specialized systems (such as evaporative coolers) may use somewhat less, but this is a useful generalization for most applications. Occasionally users have commented, 'I work in a cold climate, and the tungsten light fixtures provide heating to my space. If I change over to more energy-efficient lighting, I'll then have to use the HVAC system for heat, which would cancel out any energy savings.' It is true that in cold environments some additional heating may be required due to the lower heat output of LEDs, but there will still be overall savings in the system. Industrial heating equipment utilizes energy sources like natural gas that are much less expensive for producing heat than electricity. In addition, it is much better at sending heat only where it's needed, rather than letting it pool unused in ceilings. Some people include Carbon Footprint savings on an ROI spreadsheet, because it can help sell the green aspect of energy-efficient lighting. This varies by region, but an average calculation for many U.S. locations is 1.5 pounds (o.68kg) of CO2 per kilowatt-hour of electricity. 1 watt at luminaire = 3.412 BTUs per hour 1 watt at luminaire = 0.4 watts of air conditioning 1 watt at luminaire = 0.0015 pounds (0.00068kg) of CO2 per hour so... Note: Do not assume these values to be LAWS. They are only typical values, which SHOULD BE VERIFIED for each application. Also, if you’re interested in learning even more, here’s a free download for you: Standardized EMCS Energy Savings Calculations (20.3MB PDF) General Information
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Headquarter811 Palm StreetSan Luis Obispo, CA 93401 805 547 2050 Mailing AddressPO Box 1269San Luis Obispo, CA 93406
For technical support, please email us at: [email protected]
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