[Equest-users] Service Water Heating Energy Savings

[Eddie Corwin]

If you are in the detailed mode, you can open up the DHW loop, and see the 
assigned flow, in GPM.  This, along with the flow schedule, represents the 
amount of hot water the system is using (in general, the GPM is entered as the 
maximum flow, and the schedule reduces the flow as necessary).  To simulate the 
savings form the low-flow faucets you can either reduce the overall GPM, or you 
can edit the schedule.  Both would result in a yearly reduction of DHW.
 __________________________________________________________
Eddie Corwin, Energy & Sustainability Engineer
ALTANOVA - www.altanova-energy.com
41-41 24th Street - 4th Floor - Long Island City, NY 11101


T: (347) 410-9049
E: ecorwin at altanova-energy.com





________________________________
From: Will Mak <wmak at epsteinglobal.com>
To: equest-users at lists.onebuilding.org
Sent: Mon, October 25, 2010 11:14:49 AM
Subject: [Equest-users] Service Water Heating Energy Savings

 
I am working on a project that has energy savings on the domestic water heater 
for the service water heating due to low flow sinks and lavs. We have been asked 
to provide calculations to justify the energy savings on the energy model. The 
spreadsheet I have attached shows the calculation proving our savings however I 
am having a hard time connecting how eQuest models this compared to the 
spreadsheet along with matching the energy consumption values from eQuest and 
the spreadsheet. 

 
What should be the proper inputs for the Service Water Heating system be?
 
Any suggestions? Thanks!
 
BASELINE REPORT- BEPU Building Utility Performance                        
                           WEATHER FILE- Chicago      IL TMY2
---------------------------------------------------------------------------------------------------------------------------------

 
                         TASK     MISC    SPACE    SPACE     HEAT    PUMPS     
VENT    REFRIG  HT PUMP   DOMEST    EXT
               LIGHTS   LIGHTS   EQUIP   HEATING  COOLING   REJECT   & AUX     
FANS   DISPLAY  SUPPLEM  HOT WTR   USAGE    TOTAL
              -------  -------  -------  -------  -------  -------  -------  
-------  -------  -------  -------  -------  --------
 
EM1  ELECTRICITY     
    KWH        94936.       0.  159052.       0.  177219.       0.   33723.  
140910.       0.       0.    1857.   10821.   618518.
 
FM1  NATURAL-GAS     
    THERM          0.       0.       0.   33591.       0.       0.       
0.       0.       0.       0.       0.       0.    33591.
 
 
 
 
           TOTAL ELECTRICITY    618518. KWH        13.449 KWH     /SQFT-YR 
GROSS-AREA   13.449 KWH     /SQFT-YR NET-AREA
           TOTAL NATURAL-GAS     33591. THERM       0.730 THERM   /SQFT-YR 
GROSS-AREA    0.730 THERM   /SQFT-YR NET-AREA
 
 
           PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE =  0.3
           PERCENT OF HOURS ANY PLANT LOAD NOT SATISFIED                =  0.0
 
           NOTE:  ENERGY IS APPORTIONED HOURLY TO ALL END-USE CATEGORIES.
 
 
PROPOSED REPORT- BEPU Building Utility 
Performance                                                   WEATHER FILE- 
Chicago      IL TMY2
---------------------------------------------------------------------------------------------------------------------------------

 
                         TASK     MISC    SPACE    SPACE     HEAT    PUMPS     
VENT    REFRIG  HT PUMP   DOMEST    EXT
               LIGHTS   LIGHTS   EQUIP   HEATING  COOLING   REJECT   & AUX     
FANS   DISPLAY  SUPPLEM  HOT WTR   USAGE    TOTAL
              -------  -------  -------  -------  -------  -------  -------  
-------  -------  -------  -------  -------  --------
 
EM1  ELECTRICITY     
    KWH        62239.       0.  159052.  113974.  113369.       0.   41385.   
66957.       0.       0.    1572.    3721.   562270.
 
FM1  NATURAL-GAS     
    THERM          0.       0.       0.   18311.       0.       0.       
0.       0.       0.       0.       0.       0.    18311.
 
 
 
 
           TOTAL ELECTRICITY    562270. KWH        12.226 KWH     /SQFT-YR 
GROSS-AREA   12.226 KWH     /SQFT-YR NET-AREA
           TOTAL NATURAL-GAS     18311. THERM       0.398 THERM   /SQFT-YR 
GROSS-AREA    0.398 THERM   /SQFT-YR NET-AREA
 
 
           PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE =  0.7
           PERCENT OF HOURS ANY PLANT LOAD NOT SATISFIED                =  0.0
 
           NOTE:  ENERGY IS APPORTIONED HOURLY TO ALL END-USE CATEGORIES.
 
 
 
 
 
William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
F: (312) 559-1217
E:wmak at epsteinglobal.com
W:www.epsteinglobal.com

þEpstein is a firm believer in sustainability. We ask that you please consider 
the environment before printing this e-mail.
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