[BLDG-SIM] boiler

[Jeff Haberl]

In DOE-2.1e the LS-x  reports represent the load on the secondary HVAC system without ventilation loads, at constant space temp. The PS-X loads include the secondary HVAC system efficiency, primary HVAC system efficiency and estimates of losses for the distribution system, as well as availabilities of systems, and a few other things...so comparing LS and SS and PS reports should be done with great caution.

Jeff
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Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

Professor......................................................Office Ph: 979-845-6507

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581

College Station, Texas, USA.......................URL: www-esl.tamu.edu

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-----Original Message-----
From: postman at gard.com <postman at gard.com>
To: BLDG-SIM at gard.com <BLDG-SIM at gard.com>
Sent: Wed Jun 15 17:32:41 2005
Subject: [BLDG-SIM] boiler

Hi-
In the PS-C report (sim file), the annual heating load for the boiler is almost two-third the annual fuel use (in MBtu). 
I'm assuming that ventilation load is the difference between the heating loads from PS-C and LS-F, so PS-C should have ventilation included. Correct me if 'm wrong.
The boiler heat load is 1940 MBTU and the Fuel use is 3100 MBTU (PS-C). Applying, 84% boiler efficiency to heat load should give me 2308 MBTU (i.e., 1940* 1.19). 
So where am I getting that extra 800 MBTU from? 
Any feedback appreciated.
-- 
Vämshi Goojè