[Bldg-sim] Base case question

Ali Nazari ali at atn-energy.com
Wed Jul 7 22:14:29 PDT 2010


Hi Chris,

 

Using Figure 11.4.3, the first step is to identify the principle heating
source (I would assume there are backup boilers for the ground-source heat
pumps in the proposed design). Per ASHRAE 90.1-1999 - 11.4.3.k.2, for
systems with mixed fuel heating sources, the principle heating source is the
one with the largest total installed output capacity. Hence, the Baseline
Case should be modeled as system 6 only if the total output capacity of the
geothermal heat pumps is larger than the total output capacity of the backup
boilers.

 

In response to your second question, system 6 is distributed water-source
heat pumps with an atmospheric boiler (80% efficiency) and an axial fan
cooling tower with two-speed fans.

 

Regards,

 

Ali Nazari, M.A.Sc.

President/Principal

 

ATN_Logo_Original

 

ATN-Energy Corp.

3204 - 1111 Alberni Street

Vancouver, BC, Canada, V6E 4V2

P: 778-228-5548

E: ali at ATN-Energy.com

W: www.ATN-Energy.com

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris
Sent: July-07-10 5:15 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Base case question

 

Maybe someone can answer this for me:

 

"Using ASHRAE 90.1-1999 at the reference standard, what is the HVAC system
for the baseline building if the proposed building is a ground-source heat
pump with radiant heating and cooling?  In Figure 11.4.3, the standard
indicates that System 6 should be used.  System 6 is listed as a
water-source heat pump with direct expansion for cooling and electric heat
pump and boiler for heating.  Is System 6 distributed water-source heat
pumps with a boiler for heat and a fluid cooler for cooling?  Or is it a
ground-source heat pump with a boiler for peak demand and domestic hot
water?"

 

Thanks.



-- 
Chris Flood BSc (Eng)
Senior Building Analyst & Energy Modeller

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