Supermarket Efficiency Measure Matrix 01Jul10

7/26/2019 Supermarket Efficiency Measure Matrix 01Jul10

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Preliminary Supermarket Measure Matrix -- New Construction

5/28/2010

Reisions! 5/28/2010 Remoe" measures wit# stan"ar"s a""resse" $y %itle 20 or &e"eral Re'uirements

(/25/2010 )p"ate" priority comments

*/1/2010 )p"ate" priority comments

+tem ,escription Current Practice Sains .y ,esin .asis Notes

Condensers and Control

1.1 Floating head pressure control Nearly standard practice

1.2 FHP using ambient-following logic Common use !" ##$ %s. &'ed setpoint (mplementation and sa%ings %ary

1.) Condenser fan %ariable speed

1.* Condenser si+e ,approach

1. Condenser speci&c e/ciency

Compressors0 uction roups and Control

2.1 Compressor type

2.2 ystem con&guration

2.)

2.* ppro'. 34 adoption0 in use since 53s !" ##$ %s. &'ed setpoint

2. $echanical subcooling

!ase case7 partial FHP to 53 F C8 with&'ed setpoint9 ##$7 typical FHP to :3 F

(mplementation and sa%ings %ary9probably ;34 reali+ation %s. ideal

#ssentially standard for e%apcondensers0 fairly common on air-cooled.

!" ##$ %s. fan cycling ,air or twospeed ,e%ap

a%ings highly related to 1.1 and 1.2.9emerging use of !


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@efrigerant0 "irect %s (ndirect "esign

).1 8ype of refrigerant

).2

Fi'tures and Control

*.1 ##$ in certain situations only

*.2 se may be 134

=al-ins0 >nit Coolers and Controls

.1 >nit cooler si+e ,approach

.2 >nit cooler speci&c e/ciency =ide %ariance

.) Eariable speed fan control tudied but not used as an ##$

.* Nominal ,small


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HEC

6.1

ther

:.1 Eery freuent use for many years. ##$ in certain instances.

:.2 Piping insulation No base case or ##$0 some study

:.) 8run %s. indi%idual piping

!"7 a%ings !y "esign

##$7 #nergy #/ciency $easure

!


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%itle 2 Priority

i#

i# allowin ot#er met#o"s3

i# compare 4aora$ly wit# lowpower con"enser3

Ealuable but unliely by 2311 ,reuiresstds de%elopment

i# (mportant but reuires standardsde%elopment9 tradeoKs9Possi$le to set

a reasona$le initial limit usin

existin ratins

>nderstand performance trade-oKs fordistributed systems ,low priority

Not feasible without a performancecompliance option

No uni%ersal metric to represent controlcapablity ,low priority

i# low cost $ut oo" results takeskill/time3

i# particularly alua$le on06/50*7 % only3 $8 system

speci&c0 bene&t from performancemethod


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i#

i# rapi"ly eolin tec#noloy3


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%itle 2 Priority

i# potentialbut uncertain for 2311,many potential methods reuires

performance apporach or set a:exi$le re'uirement to use a smallpercentae

>ncertain0 needs &eld in%estigation.$ay not be %iable with *3*?3:

(mportant part of indirect pacage orprescriti%e reuirements

Potential high %alue0 if not as aregulation0 as design information. 8ies inwith electric %s. gas defrost noted abo%e.

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Supermarket Efficiency Measure Matrix 01Jul10