[BLDG-SIM] one more thing about ERVs in eQuest

Brandon Nichols BrandonN at Hargis.biz
Sun Nov 11 17:47:58 PST 2007


Hi Karen,

Without seeing all the details, its hard to offer specific
recommendations.  However one thing I would be sure to do is a reality
check -- following is a report from a nifty outside air load estimator
that I just found earlier today in the course of doing something else
(see this post
<http://elcca-exchange.blogspot.com/2007/11/outdoor-air-load-estimator.h
tml> ) which, after running your numbers through it, gives cause for
double-checking your calculated $450,000 per year savings (again, see
post for details).

HTH

Brandon




************************************************************************
********************

Result summary for Calculation Number: 5
Location:             BURLINGTON, Vermont
Elevation:            341 ft
Operating Hours:      0:00 o'clock until 0:00 o'clock
Hours of Operation:   24
Makeup Air Flow:      183000 cfm
Thermostat Setpoints: Heating = 68 F, Cooling = 72 F

Dehumidification was set to limit the Relative Humidity to: No
Dehumidification

Heating was locked out during: --
Cooling was locked out during: --

The Lockout of Heating or Cooling systems resulted in...
  Insufficient Heating during: --
  Insufficient Cooling during: --

The Heating Design Load is: 18891.3 kBtu/h
The Cooling Design Load is: 4754.9 kBtu/h

Calculated Monthly loads:
Month               Heating Load            Cooling Load
January    :        7,847,593 kBtu                  0 kBtu
February   :        7,329,964 kBtu                  0 kBtu
March      :        6,296,320 kBtu                  0 kBtu
April      :        3,911,545 kBtu             28,900 kBtu
May        :        1,574,753 kBtu             97,140 kBtu
June       :          889,352 kBtu            128,736 kBtu
July       :          399,761 kBtu            382,194 kBtu
August     :          532,923 kBtu            221,369 kBtu
September  :        1,517,449 kBtu             33,329 kBtu
October    :        2,836,548 kBtu                  0 kBtu
November   :        4,821,821 kBtu                  0 kBtu
December   :        6,956,354 kBtu                  0 kBtu
Total_Year :       44,914,382 kBtu            891,668 kBtu

FAN ENERGY CALCULATIONS:
                           Supply               Exhaust
Total Static Pressure:     3.5 inW              1.0 inW
Fan Type:                  Forward_Curved       Forward_Curved
Fan Efficiency:            63.0 %               63.0 %
Motor Class:               Standard             Standard
Motor Efficiency:          91.0 %               89.0 %
Motor Output Power:        159.032 HP           45.438 HP
Moter Rated Input:         130.319 kW           38.071 kW
Motor Energy Consumption:  1141594 kWh          333499 kWh     
************************************************************************
********************


Brandon Nichols, PE, LEED(r) AP
Mechanical
HARGIS ENGINEERS
600 Stewart Street
Suite 1000
Seattle, WA 98101
www.hargis.biz


d | 206.436.0400  c | 206.228.8707
o | 206.448.3376  f  | 206.448.4450



-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com
<mailto:BLDG-SIM at gard.com> ] On Behalf Of Karen Walkerman
Sent: Friday, November 09, 2007 7:09 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] one more thing about ERVs in eQuest

Also, how does one properly model an ERV for a system that is not 100%
outdoor air?  How does it get modeled if the ventilation is demand
controlled?

--
Karen Walkerman
Second Law

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