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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Typo in DES v2?

Haojie Wang

Energy Modeler

KJWW Engineering

LEEDuser Basic Member

3 thumbs up

April 14, 2015

To calculate the virtual rate, DES v2 option 1 2.4.2.1 gives the equation of $/MBTU of hot water = 1.59*$/MBTU fuel + 3 * $/kWh electricity. This would gives me a really big number. For example, for IL, the state averaged gas is $0.00757/MBTU, Electricity, $0.084/kWh. And hot water would be $ 0.264/MBH. Which is almost 40 times higher than gas price. However, if I replace MBTU to mmBTU, everything looks normal. I wonder if people who wrote DES v2 got confused with MBTU with mmBTU

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 04/14/2015 - 17:42

The MBTU in the DES is million BTU.

Haojie Wang

Energy Modeler

KJWW Engineering

LEEDuser Basic Member

3 thumbs up

Tue, 04/14/2015 - 17:45

Thats what I thought too. But I think they should make it very clear next to the equation, as MBTU is actually 1000 BTU in IP system (Though I hate this system since I came from a metric country but contractors here are reluctant to use SI).

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 04/14/2015 - 17:53

Mixing systems seems to be commonplace here. Everyone seems to use kBTU here to represent 1000. I agree that it makes no sense.

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