[Equest-users] Heat Rejection consumption is so small!!

[Karen Walkerman]

Also, the pumping energy for the cooling tower ends up in Pumps and
Auxiliary.  This number usually constitutes much of the energy used by the
cooling towers.

--
Karen

On Wed, Jul 21, 2010 at 10:59 AM, James Hansen <JHANSEN at ghtltd.com> wrote:

>  Cooling towers are just fans, so it’s no surprise that their percentage
> relative to the total consumption is small.  Make sure your cell KW or total
> fan EIR is accurate.
>
>
>
> And as for your question on reset:  I usually just specify the condenser
> water loop control strategy to be LOAD RESET, with a minimum reset
> temperature of 70 degrees.
>
>
>
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> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Omar Katanani
> *Sent:* Wednesday, July 21, 2010 9:55 AM
> *To:* Omar Katanani; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Heat Rejection consumption is so small!!
>
>
>
>
>
> Dear all,
>
> Can anyone please answer my question that I sent last week? Your continuous
> support is much appreciated!
> In addition to that, I have this small question below:
>
> Section G3.1.3.11 of ASHRAE 90.1 - 2007 says:
>
> "Condenser water design supply temperature shall be 85°F or 10°F
> approaching design wet-bulb temperature, whichever is lower, with a design
> temperature rise of 10°F. The tower shall be controlled to maintain a 70°F
> leaving water temperature where weather permits, floating up to leaving
> water temperature at design conditions."
>
> I was able to put the design set point temperature  and the loop design DT
> of the Condenser water loop to 85F and 10F respectively.
>
> What about the tower? Where can I input this leaving temperature range from
> 70F up to the leaving water temperature?
>
>
> Many thanks!
> Omar
> ___________________________
>
> Omar Katanani
> Sustainable Design Engineer
> Email: omar at ecoconsulting.net
>
>
> EcoConsulting (Lebanon)
> Nahas Building, 4th floor
> 4 St-Maron Street / Georges Haddad Avenue
> Postal Code: 2028 5806 SAIFI
> Beirut, Lebanon
> Tel:       +961 (0) 1 971 255
> Mobile:    +961 (0) 3 045 045
>
>
> EcoConsulting (UK) Ltd
> 28 Marshalsea Road
> London, SE1 1HF
> Tel: +44 (0)207 939 0989
> Fax: +44 (0)207 939 0981
> Website: www.ecoconsulting.net
>
>
>
> -----Original Message-----
> From: Omar Katanani
> Sent: Thu 7/15/2010 1:54 PM
> To: equest-users at lists.onebuilding.org
> Subject: Heat Rejection consumption is so small!!
>
>
>
> Dear all,
>
>
>
> What are typical values for heat rejection, if my Space Cooling constitutes
> 25% of my school consumption? All I'm getting is 1% or so!
>
>
>
> I left eQUEST to autosize the capacity of the tower, and I entered many
> default values into the inputs of the Open Tower and the Condenser Loop.
> I've heard that Heat Rejection in such climates such as Lebanon should reach
> at least 10%.
>
>
>
> One more thing, when modeling the baseline case according to ASHRAE 90.1, I
> read that I should model a condenser water loop for each chiller. So if I
> have 2 chillers, will I need 2 Open Towers?
>
>
>
> Many thanks,
>
> Omar
>
> ___________________________
>
> Omar Katanani
> Sustainable Design Engineer
>
> Email: omar at ecoconsulting.net
>
>
>
> EcoConsulting (Lebanon)
>
> Nahas Building, 4th floor
>
> 4 St-Maron Street / Georges Haddad Avenue
>
> Postal Code: 2028 5806 SAIFI
>
> Beirut, Lebanon
>
> Tel:          +961 (0) 1 971 255
> Mobile:    +961 (0) 3 045 045
>
>
>
> EcoConsulting (UK) Ltd
> 28 Marshalsea Road
> London, SE1 1HF
> Tel:  +44 (0) 207 939 0989
> Fax:  +44 (0) 207 939 0981
>
> Website: www.ecoconsulting.net <http://www.ecoconsulting.net/>
>
>
>
>
>
>
>
>
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