[Bldg-sim] ERV with increasing cooling load

[Kingsley, Michael L.]

Gary,

A dual enthalpy type economizer would be recommended rather than a dry
bulb type.  In either case the number of econmizer hours would be less
for a warm/humid climate than for a temperate northern climate.  My
response to Shaojie was aimed at trying to troubleshoot why his cooling
load increased with the heat recovery.  Extra fan heat doesn't seem to
be the cause because fan energy consumption was forced to not increase
with the heat recovery.

Best Regards,

Mike

Michael L. Kingsley, PhD, PE, LEED AP
Senior Engineer/ Project Manager
SAIC
6390 Fly Road
East Syracuse, New York 13057
Phone:  (315) 437-1869  x205
Cell:     (315) 373-4081
Fax:     (315) 437-1866
Email:  kingsleym at saic.com

-----Original Message-----
From: GARYCLEWIS at aol.com [mailto:GARYCLEWIS at aol.com] 
Sent: Tuesday, October 28, 2008 8:50 AM
To: Kingsley, Michael L.
Cc: GARYCLEWIS at aol.com
Subject: Re: [Bldg-sim] ERV with increasing cooling load

Mike,
 
I agree with you. "Free Cooling" via Economizer is a great concept for
the Northern Climates.
 
The Florida / Texas Coast line however have a major problem with
Humidity.
 
Once the structure is balanced, the humidity removed, I question even
the Moderate or Mild Climate periods of the year for economizer use in
some climates.  Can Mechanical ventilation allow a dry bulb controller
to be  set at a higher temperature in the summer months?  Logic is that
structure is sealed so that zero infiltration occurs and grains per
pound are removed via a wet evaporator coil? 
 
What is the solution for ERV and Economizer use for the Humid climates?

 
 
Thanks,
Gary
 
 
 
In a message dated 10/28/2008 7:09:36 A.M. Central Daylight Time,
MICHAEL.L.KINGSLEY at saic.com writes:

	Shaojie,
	
	Check to make sure that you are not recovering heat during hours
that
	you can be using the economizer.  Choose the Control Sequences:
	Operation: "When Minimum OA" so that the heat recovery device
will only
	operate when you cannot benefit from free cooling.
	
	Mike
	
	Michael L. Kingsley, PhD, PE, LEED AP
	Senior Engineer/ Project Manager
	SAIC
	6390 Fly Road
	East Syracuse, New York 13057
	Phone:  (315) 437-1869  x205
	Cell:     (315) 373-4081
	Fax:     (315) 437-1866
	Email:  kingsleym at saic.com
	
	-----Original Message-----
	From: bldg-sim-bounces at lists.onebuilding.org
	[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of
eric wang
	Sent: Monday, October 27, 2008 11:32 PM
	To: bldg-sim at lists.onebuilding.org
	Subject: [Bldg-sim] ERV with increasing cooling load
	
	Hi,
	
	I model a PSZ system with exhaust air heat recovery. I set the
static
	pressures of supply/exhaust fans as zero in ERV tab. Therefore,
the fan
	energy is the same with or without ERV. However, there is an
increasing
	cooling load in the cooling model. I changed the hourly report
and
	didn't find the reason. Any suggestions are highly appreciated.
	
	Thanks
	
	Shaojie 
	
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