CBECC-Com Issue - Lighting/Internal Loads

kbenne / cbecc

Automatically exported from code.google.com/p/cbecc

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Version = 2013_3a_687

Category = Lighting/Internal Loads
IES reference: 0075562

Issue Summary:
The following error message (sent by an IES customer) occurs for a museum 
exhibit space, which is one of the space types exempted from Section 140.3(c)  
under EXCEPTION 1.

Error: Standards Section 140.3C requires 130839 ft2 of top and/or primary 
sidelit daylit area for Space Interior Gallery_SN000005. Calculated daylit area 
for the proposed design is less than the prescriptive requirement. Current 
CBECC-Com functionality does not include prescriptive trade-offs for daylit 
area required by 140.3C evaluating rule: Set CHECKCODE Spc:MandMinDaylitArea 
(43:'Daylighting_Spc.rule' line 1158)

We can see that ‘Daylighting_Spc.rule’ doesn’t yet exempt these space 
types (and I have also checked the current v3b version).

Could you clarify why this is not yet included?

Original issue reported on code.google.com by f.le...@gmail.com on 6 Jan 2015 at 10:11

Exceptions to the 140.3(c) mandatory daylit area requirement are handled through the following properties: Spc:SkyltReqExcptFrac (SkylightRequirementExceptionFraction) Spc:SkyltReqExcpt (SkylightRequirementException) SkyltReqExcptFrac allows users to claim an exception to 140.3(c) for all or part of a space, i.e. setting SkyltReqExcptFrac to 1.0 will claim the expectation for 100% all of the space area. SkyltReqExcpt identifies the specific exception, i.e. Museum Exhibit, Movie Theater, etc. This field is only available if SkyltReqExcptFrac > 0. We have chosen this manual approach (rather than doing it automatically) because there is not a 1 to 1 correspondence between the exception list and the list of space functions. In the interface, access to these properties is provided on the Space:Daylighting Tab.

kbenne / cbecc

CBECC-Com Issue - Lighting/Internal Loads #902