Can Appliances be Centralized to One Unit in Multifamily and a Question about Lighting

3 replies [Last post]
Shrajasekaran
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Joined: 05/15/2017

Hello,

I wanted to model a single house but I want to vary the climate zones (such as turn the downstairs to 62 in the winter and the upstairs 68) in certain parts of the house so I proceeded to use the multifamily modeling. However is it possible to set the appliances (just the appliances and misc.) to one unit such as downstairs. That way when I am finished with my simulation I can simply see how much heating and cooling costs vary with climate zones.

Also, when I run the simulations I am seeing that using LED vs 100% incandescent jumps from 1556 kwh/yr to 3391 kwh/yr. That seems wrong to me. Is there something I am missing here?

Thanks

Shravan Rajasekaran

shorowit
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BEopt developer
Joined: 09/27/2011

The BEopt multifamily model assumes identical building components in each unit, though the usage level (e.g., amount of dishwasher energy use) can vary based on the unit floor area & number of bedrooms.

Please attach your project file that demonstrates the LED/incandescent lighting issue and we can take a look.

Scott


Scott Horowitz
Residential Buildings Group
National Renewable Energy Laboratory

Shrajasekaran
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Joined: 05/15/2017

Thanks Scott. I have attached a case. If you look under the kwh tab the LED usage seems much too high for a small home such as this. Also do you have any insight on why the misc use is so high? The category that will fall under are things such as TVs, stereos, fans correct? I have not added any pool pumps or such but it seems to high for that.
Thanks
Shravan

AttachmentSize
Toy.BEopt 3.32 MB

Shravan Rajasekaran

shorowit
Offline
BEopt developer
Joined: 09/27/2011

Lighting energy use estimates are based on national average usage, with LEDs maintaining an equivalent luments/sqft as incandescent bulbs, including exterior and garage lighting energy use (if present). See the equation(s) in the Building America House Simulations Protocol documents. If you have reason to think your lighting energy use will be lower, you can enter that lower value into BEopt. You can also double-check if the LED efficacy value being used (80 lm/W) matches products of interest in the market.

Misc usage (plug loads) are also based on national averages. The equation, based on # beds and floor area, is provided in BEopt. Again, if you think your usage is lower than the national average, you can specify the 0.75 or 0.50 options, for example.


Scott Horowitz
Residential Buildings Group
National Renewable Energy Laboratory

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