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@xxxxxxxxx> ]
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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