[BLDG-SIM] FW: ASHRAE 90.1-1989 Power Adjustment Factors

[Chris Jones]

Thanks for that reply.  I was actually looking for back ground on the 
Lighting Control Power Adjustment Factors as outlined in ASHRAE 90.1-1989 
Section 6.4.3.  For example, for daylighting, on/off control the PAF is 0.1.


>Here is the response I got from Eric Richman, 90.1 lighting subcommittee 
>chair,
>
>- krishnan
>
>         -----Original Message-----
>         From: Richman, Eric E
>         Sent: Thu 1/29/2004 4:50 PM
>         To: Gowri, Krishnan
>         Cc:
>         Subject: RE: [BLDG-SIM] ASHRAE 90.1-1989 Power Adjustment Factors
>
>
>
>         As the current chair of the 90.1 lighting subcommittee, I can 
> offer the following:
>         The power adjustment factors (the factor that uses room 
> dimensions to adjust LPD values up) are based on the calculation method 
> for LPD determination from the old IESNA LEM-1 procedure.  These factors 
> recognize the fact that different space types have different dimensions 
> that will effect the required LPD to light a room.
>
>         The 90.1-1999/2001 standard has done away with these adjustments 
> (primarily for ease of use of the standard) in favor of a standard 
> representative LPD that reflects the commonly expected RCR value for each 
> specific space type.  It was recognized early in the 90.1-1999 
> development process that specific space types generally had consistent 
> RCR categories within that space type.  The resulting LPDs used in the 
> standard incorporate these typical RCR characteristics.
>
>         Eric E. Richman
>         Pacific Northwest National Laboratory
>         P. O. Box 999  MS K5-16
>         Richland, WA  99352
>         (509) 375-3655
>         (509) 375-3614 (FAX)
>
>
>         -----Original Message-----
>         From: Gowri, Krishnan
>         Sent: Thursday, January 29, 2004 10:50 AM
>         To: Richman, Eric E
>         Subject: FW: [BLDG-SIM] ASHRAE 90.1-1989 Power Adjustment Factors
>
>
>         Eric:  You may have an answer for this question, - krishnan
>
>         -----Original Message-----
>         From: Chris Jones [mailto: <mailto:cj at cr-jay.ca> ]
>         Sent: Thursday, January 29, 2004 10:32 AM
>         To:
>         Subject: [BLDG-SIM] ASHRAE 90.1-1989 Power Adjustment Factors
>
>
>         Does anyone know how the ASHRAE 90.1-1989 Lighting Power 
> Adjustment Factors
>         were derived?  See 90.1-1989 6.4.3.
>         Why were they dropped from subsequent versions of 90.1?
>
>
>
>         Chris Jones, P. Eng.
>         14 Oneida Avenue
>         Toronto, ON M5J 2E3
>         Tel. 416 203-7465
>         Fax. 416 203-8249
>
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Chris Jones, P. Eng.
14 Oneida Avenue
Toronto, ON M5J 2E3
Tel. 416 203-7465
Fax. 416 203-8249

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