wwr external powerpoint template – 2011 · 2016-03-30 · photo: modine website . microchannel...

NRG & NRJ Microchannel Condensers Customer Briefing

Microchannel Coil Overview WHAT IS A MICROCHANNEL COIL?

Flat Streamlined Tubes

One larger tube split into multiple smaller

parallel ports

Overall heat transfer efficiency due to

Improved airside performance

Higher primary surface area

Reduced refrigerant side pressure drop

Key Microchannel Primary Benefits

Reduced Refrigerant Charge

Corrosion Resistance

Lighter Weight vs. RTPF

Microchannel Coil Overview VALUE PROPOSITION, FEATURE AND BENEFITS

Microchannel Coil Overview MICROCHANNEL APPLICATIONS

Heatcraft ½-6hp

Condensing Units

(>150,000)

Residential Air

Conditioning

Rooftop Air Conditioning Chillers

Automotive Photo: Modine Website

Microchannel Coil Overview OBSTACLES TO ADOPTION

Volumes

Traditionally automotive volumes

All Aluminum Design

Negative Connotations due to early

experiences with aluminum round-tube

plate fine

Subject to leaks

Not easily repairable

Early Design Challenges

Initial refrigeration implementations might

not have permitted sufficient expansion

and contraction

Needs floating (or otherwise flexible) coil

mounting design

Source: Modine Website

NRG & NRJ Microchannel Condensers Variable Speed EC

Variable Speed EC (VSEC) WHERE ARE THESE MOTORS COMMONLY USED

Fitness Equipment (treadmills, etc)

HVACR equipment

Large industrial machines

Household electronics

Variable Speed EC (VSEC) WHAT IS A EC MOTOR?

Electronically Commutated (EC, ECM) Motor = Brushless DC

(BLDC) Motor

Just different names

EC Motors are current trend in motor technology due to high

efficiency

up to 75% efficient 51-59% increase vs shaded-pole motors

30-35% increase vs permanent split-capacitor (PSC) Motors

Varies Speed continuously to meet system requirements

0

2

4

6

8

10

12

14

30% 40% 50% 60% 70% 80% 90% 100%

Typical

Operating

*NQ*

*NH*

*NL*

*NE*

NRG*

Load Requirement (NRG Baseline)

Po

wer

Co

nsu

mp

tio

n (

kW)

Variable Speed EC (VSEC) WHAT IS A VSEC MOTOR

Power Consumption increases disproportionally with fan speed

Variable Speed EC (VSEC) WHAT IS A VSEC MOTOR

Source: http://www.dchuddle.com/

Direct Condenser Power Consumption

Rack Power Consumption

In field test, Store B, equipped with VSEC motors, was verified to have obtained a 69%

reduction in condenser energy costs and 13% reduction in rack energy

costs**compared with Store A and its fixed-speed motor unit.

Variable Speed EC (VSEC) ENERGY SAVINGS

Electricity Expense Comparison of

VSEC vs. Standard Fixed Speed Motor


13

Motor Testing

shows significant

performance improvement

Significant energy savings • 75% to 80% reduction in power

usage

Maintains constant head pressure • More stable temperature control


NRG & NRJ Microchannel Condensers

Product Training

15

Microchannel Air-Cooled Condenser FIRST FIELD TRIAL INSTALLATION – JANUARY 05, 2012

Reduced Refrigerant Charge

More than 70% reduction in refrigerant charge1, 2

Up to $2000 in refrigerant charge cost savings per unit2,3

1Based on R-404A refrigerant charge for flooded condenser based on NRGD02A014 vs BNES02A015 at -20F ambient 2Does not include receiver, piping or manifold charge 3Based on 198 lbs of refrigerant charge reduction in comparable 8 fan units at $10 per pound price for R-404A

2 Fan 4 Fan 6 Fan 8 Fan

104lbs

30lbs

10lbs

35lbs

20lbs

69lbs

238lbs

40lbs

= Microchannel Condenser

= Round-Tube, Plate-Fin Condenser

Microchannel Air-Cooled Condenser VALUE PROPOSITION, FEATURE AND BENEFITS

Very efficient Variable Speed EC fan motors

Vary speed to match system demands

Up to 10% additional savings on compressor/rack energy consumption


*NH

*NL

*NE

*NQ

Po

wer

Co

nsu

mp

tio

n (

kW)

Load Requirement (NRG Baseline)

NRJ

NRG

Assumptions: 1.) Climate information per ASHRAE Std 550 – US avg 2.) Energy rate: $0.10 cents per kWh

Microchannel Air-Cooled Condenser REPRESENTATIVE ENERGY COMPARISON – 540 RPM

BNQ* NRG* NRJ* NRJ* (VFD)

Medium Temperature

Unit: BNQ-D12=A069 kWh Consumed: 22,180 Energy Cost: $2,218

Units: NRGD06A041 NRGD04A027 kWh Consumed: 12,435 Energy Cost: $1,244

Units: NRJD06A041 NRJD04A027 kWh Consumed: 80,971 Energy Cost: $8,097

Units: NRJD06A041 NRJD04A027 kWh Consumed: 23,571 Energy Cost: $2,357

Low Temperature

Unit: BNQ-D04A023 kWh Consumed: 12,201 Energy Cost: $1,220

Units: NRGD04A027 kWh Consumed: 3,436 Energy Cost: $344

Units: NRGD04A027 kWh Consumed: 33,535 Energy Cost: $3,354

Units: NRGD04A027 kWh Consumed: 7,300 Energy Cost: $730

Total kWh Consumed: 34,381 Energy Cost: $3,438

kWh Consumed: $15,871 Energy Cost: $1,587

kWh Consumed: 114,506 Energy Cost: $11,451

kWh Consumed: 30,871 Energy Cost: $3,087

Microchannel Energy Savings

- $1,851 N/A $351

1140RPM vs Replacement Condensers

Existing Condenser

Replacement Condenser

Annual Energy Savings (kWh)

Annual Energy Savings (USD)

BNH-D08-A058 BNE-D08-A062 57,270 kWh $6,300

NRG-D08-A054 72,896 kWH $8,019

Significant energy savings opportunities by upgrading to higher

efficiency, energy efficient motors

• Variable Speed EC (VSEC)

Assumptions:

Location: Atlanta, GA

Energy Cost: $0.11/kWh

Microchannel Air-Cooled Condenser REPRESENTATIVE ENERGY COMPARISON – 1140 RPM

Significant Sound Reduction

Up to 3.4 dBA vs standard *NE* series condenser at 10ft.

More than 50% reduction in sound intensity

Sound by Percentage of Max Speed

BNE @ 100%

69.9 dBA

72.9 dBA

74.7 dBA

75.9 dBA

30% (255 rpm)

50% (425 rpm)

70% (595rpm)

100% (850rpm)

NRGD02A014 44.3 dBA 50.6 dBA 57.6 dBA 66.5 dBA




NRG Advantage

3.4 dBA

3.4 dBA

3.4 dBA

3.4dBA


Low Profile

Over 25% lower cabinet height1

• May reduce need for visibility fencing and/or walls

20”

26” 35”

Standard Air-Cooled

Condenser Microchannel Air-Cooled

Condenser 20”

1vs. comparable Round Tube Plate Fin Air Cooled Condenser


Reduced Weight

More than 20% reduction in unit weight

• May reduce need for structural supports

• Reduction in shipping costs

1vs. comparable Round Tube Plate Fin Air Cooled Condenser

Reduction %

20%

27%

26%

27%

NRG* Model Weight *NE* Model Weight

NRGD02A014 510 BNES02A015 640

NRGD04A027 1015 BNED04A031 1390

NRGD06A041 1520 BNED06A046 2060

NRGD08A054 2005 BNED08A062 2730



Monometal coil

• Virtually eliminate galvanic corrosion

30,000

25,000

20,000

15,000

10,000

5,000

0 0 0.01 0.02 0.03 0.04 0.05

30,000

25,000

20,000

15,000

10,000

5,000

0 0 0.01 0.02 0.03 0.04

Air Horsepower (hp) Air Horsepower (hp)

Heat

Tra

nsfe

r C

apacity (

BT

UH

)

Heat

Tra

nsfe

r C

apacity (

BT

UH

)

Significant decrease in

capacity due to corrosion

after one year

No significant change in

performance after one year

Coastal Performance Comparison

Uncoated Coil Microchannel Coil

0.05


AFTER 1 YEAR OF

EXPOSURE

BASELINE

Round-Tube, Plate-Fin

Corrosion after 1 Year in Coastal Application

Microchannel Coil



Monometal coil

• Virtually eliminate galvanic corrosion

2759

5234 6,000

5,000

4,000

3,000

2,000

1,000

0 Round Tube – Plate

Fin with E-Coat

Microchannel

Time to Failure= time (hours) until capacity is degraded by 15%

Tim

e t

o F

ailu

re

Accelerated Corrosion Testing

Accelerated Corrosion Test

Repeated, Cyclic Exposure to:

1. Salt Fog

2. High Humidity – Hot Ambient

3. High Humidity – Cold Ambient

4. Low Humidity – Low Ambient

Microchannel Coil remained “functional” for 89% longer

than Round Tube – Plate Fin coated with E-Coat


Questions?

wwr external powerpoint template – 2011 · 2016-03-30 · photo: modine website . microchannel...

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