search

kbenne / cbecc

Automatically exported from code.google.com/p/cbecc
0 stars 0 forks source link

5.4.5 Dimming Performance Curves for Luminaires, Daylightng Control Type Options #360

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What NACM Section(s) are relevant to this issue?

5.4.5 Descriptors:  Minimum Dimming Power Fraction, Minimum Dimming Light 
Fraction, Daylighting Control Type

Explanation of issue:

1. The values for the minimum power fraction and the minimum light fraction 
appear to be reversed - lighting efficacy should likely decrease when the 
lights are dimmed.

2. For Daylighting Control Type - is the Stepped Switching control supported by 
the ACM? (It is supported by EnergyPlus.) For stepped switching, the dimming 
power fraction would equal the dimming light fraction.

Proposed resolution:

1. Verify if values for the two building descriptor lists need to be swapped 
with each other, and update ACM as needed.

2. Add Stepped Switching control if it should be supported.

Please provide any additional information below.

Original issue reported on code.google.com by JohnJArent on 27 Nov 2013 at 12:40

GoogleCodeExporter commented 9 years ago 
Final language for item #1 to be determined, but the plan is to revise the 
Dimming Light Power Fraction is to include the following table:

Light Source    Power Fraction  Light output Fraction
LED 0.1 0.1
Fluorescent 0.2 0.2
Mercury Vapor   0.3 0.2
Metal Halide    0.45    0.2
High Pressure sodium    0.4 0.2
CFL 0.4 0.2
Incandescent    0.5 0.2

Issue #2: Not sure about this one - if we support this, then the number of 
lamps or dimming characteristics will also need to be specified.

Original comment by JohnJArent on 2 Dec 2013 at 11:11

GoogleCodeExporter commented 9 years ago 
Regarding # 1.  
The updated list above includes luminare types not present in the original and 
also not present in the updated list of space heat gain fractions.  The new 
luminaire types are:

Mercury Vapor
High Pressure Sodium

Please confirm whether these are to be added to the list of luminaire type 
enumerations.  If so we will also need to update the Light Heat Gain 
distribution table to include these luminaire types (See issue 110).

Regarding #2
From an E+ point of view, the only inputs to the Stepped Switching control are:
  # of steps
  frac of lights controlled 
These are already represented in the SDD.

We should discuss this second issue further - I just re-reviewed the E+ I/O ref 
and it looks like E+ ONLY supports stepped switching (not stepped dimming).  
I've got a note in to Rob Hitchcock (copied here) to verify.

Original comment by lu...@360-analytics.com on 3 Dec 2013 at 1:20

GoogleCodeExporter commented 9 years ago 
Have moved the portion of this issue described in #2 above to new issue #370

Original comment by lu...@360-analytics.com on 7 Dec 2013 at 1:38

GoogleCodeExporter commented 9 years ago 
See issue #309.  See attached text.

Original comment by JohnJArent on 19 Dec 2013 at 11:19

Attachments:

GoogleCodeExporter commented 9 years ago 
Closing issue - Luke, please let me know if there are any issues with the 
current ACM language, thanks.

Original comment by JohnJArent on 12 Feb 2014 at 5:51