[Bldg-sim] ASHRAE Appendix G EER Calculation

[Nick Caton]

Mr. Sam is referencing/providing:

 

User's Manual for ANSI/ASHRAE/IESNA Standard 90.1-2007

Example 11-C  "Calculating COP for Compressor and Condenser"

 

(Found on page 11-18)

 

~Nick

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

www.smithboucher.com 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Arpan
Bakshi
Sent: Monday, January 31, 2011 4:48 PM
To: Sam Mason
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE Appendix G EER Calculation

 

Sam

 

Great example. Would you kindly provide a detailed citation, so it is
recorded in the archives.

 

Thanks

 

Arpan

 

On Mon, Jan 31, 2011 at 5:30 PM, Sam Mason <sam.mason at atelierten.com>
wrote:

Karen,

>From the user's guide, the fan power should be removed from the standard
EER rating of packaged cooling systems. Excerpt below but let me know if
you have any further questions.

 

A 15-ton packaged rooftop single-zone system having an EER of 8.6 (COP
of 2.5) is

specified for a building. The following table gives the design
specifications. How should

this be modeled?

Equipment parameter                               Value

Net Cooling Capacity (Btu/h)                   174,000

Total Packaged Unit Input Power (W)        20,128

EER                                                         8.64

Gross Cooling Cap (ARI conditions)         182,000

A

The supply fan power is the difference between the gross and the net
cooling capacity.

Supply Fan Power  = (182,000 - 174,000 Btu / h) / 3.413 Btu /W h =  2343
W

 

>From the equation for cooling system COP, the cooling provided by the
compressor and

the condenser into the airstream in Btu/h per Btu/h of electrical power
input is:

COP  = (182,000 Btu / h) / {(20,128 - 2343 W)* 3.413 Btu / W h } = 3.0

Some simulation programs use an energy input ratio (EIR), which is
1/COP. In this case,

the EIR for this piece of equipment would be 1/3 or 0.333.

 

--

Sam Mason

Atelier Ten

 

T  +1 212 254 4500 x221

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:
bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Karen Walkerman
Sent: Monday, January 31, 2011 3:53 PM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE Appendix G EER Calculation

 

A clarification:

 

My question pertains to baseline models, with baseline systems.

 

--

Karen

 

On Mon, Jan 31, 2011 at 12:09 PM, Karen Walkerman <kwalkerman at gmail.com>
wrote:

Hi All,

 

G3.1.2.1 in ASHRAE 90.1 says that "Where efficiency ratings, such as EER
and COP, include fan energy, the descriptor shall be broken down into
its components so that supply fan energy can be modeled separately."

 

However, I am a little unclear as to which baseline systems this applies
to.  It seems that it would apply to systems 1 - 2, and not to systems 3
- 8?

 

Thanks,

 

--

Karen

 


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