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Page 1: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Program OverviewTechnology OverviewEnergy SavingsCustomer Benefits

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Page 2: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

What is DEPACC? – Program Overview

• Technology: Direct Evaporative Pre-Cooling for Air Cooled Condensers used with unitary DX air conditioning equipment, typically RTUs

• New for 2014 – All Air-cooled Chillers• Program: Prescriptive incentive program to increase the adoption

of evaporative pre-condensing as a retrofit measure• Part of the existing Xcel Cooling Efficiency Program

• Preapproval is not required

• Any nonresidential• Dedicated data centers must apply through custom process

• Minimal system size is 10 tons

• Incentive is $100/ton

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Page 3: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

DEPACC – Technology Overview

• Evaporative pre-cooling:• Cools hot outside air before cooling the

condenser coils

• AC system operates as if it were 20O or more cooler at the coil than ambient dry bulb

• Typical results in 15 – 30% improvement in cooling energy efficiency

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Page 4: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Two Types of Systems

Mist with saturated membrane – no sump or recirculation

Saturated membrane with sump and recirculation

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Page 5: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Qualified Solutions

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Once Through Systems

Recirculation Systems

Page 6: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

System Providers & Installations

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HydrEVAP by RCF Inc., distributed by ATEC/Indirex

EVAPORCOOL by Evaporcool Inc. distributed by Evaporcool

Dual Cool by Integrated Comfort Inc., distributed by ATEC/Indirex

Smart Mist by Cloudburst

Page 7: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Program Eligibility Requirements

• DX RTU and Air-Cooled Chillers• System Size not less than 10 tons cooling capacity• Evaporative pre-condensing system must provide a minimum of 75%

temperature reduction of the potential total wet bulb depression available at all ambient conditions when the compressor operates.

• DEPACC system shall be configured such that no water mist or spray to contact or accumulate on the condenser coils.

• DEPACC system must include a mechanical or chemical water treatment system to prevent scaling

• System should be equipped with controls that limit water use• Dedicated data center facilities are ineligible as prescriptive

measure and must use Xcel custom measure process

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Page 8: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Targeted Building Types

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• Program Savings per ton of cooling are correlated with building use type and location

• Hospitals, Lodging & Offices yield highest savings

Expected Annual Savings by Building Type per Ton

$/ton Front Range Western Slope

 

PSC-SGL PSC- SG & STOU PSC-SGL PSC- SG & STOU

Education - Community College $44 $29 $51 $34

Education - Secondary School $27 $18 $32 $21

Education - University $59 $39 $68 $46

Health/Medical - Clinic $50 $33 $58 $39

Health/Medical - Hospital $97 $65 $113 $75

Lodging $81 $54 $95 $63

Office $66 $44 $77 $51

Retail $59 $39 $68 $45

Page 9: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Targeted Equipment – RTUs

Larger Systems are somewhat better•Installed cost per unit diminishes as system size increases

Key Variables • Water available on the roof• Size of the equipment• Roof accessibility for contractor

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Page 10: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Breadth of Energy Bill Savings

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• Cost Savings:$44 to $115 / ton annual

savings

• Simple Payback:Less than 2 years

Page 11: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Representative Project Energy Savings

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Denver Office Building 150,000 sf 320 tons Cooling (4-80 ton RTU’s)

Peak Summer Week 40% Cooling Energy Savings

Annual 19% Cooling Energy Savings 2,400 kWh / week average

Page 12: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Representative Project Energy Savings

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Denver Office Building 150,000 sf 320 tons Cooling (4-80 ton RTU’s)

Peak Summer Week 15% Total Building Energy Savings

Annual 4% Total Building Energy Savings2,400 kWh / week average

Savings

Page 13: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

What are the Customer Benefits?

•DEPACC program can deliver good ROI and reliable savings• Typical 1-2 YR Simple Paybacks

•Proven improvements in Air Conditioner performance• Cooler low side temperatures which allow for colder conditioned air

• Reduce energy consumption 15-20%

• Reduce energy peak demand typically 15-35%

•Help protect coils from damage and debris build-up• Simplifies & Reduces condenser coil cleaning

• Enhances life of the DX unit• Reducing head pressure

• Protects contamination of condenser coils

•Can reduce the need for over-designing new and existing building

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Page 14: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Project Scoping

Initial Customer Qualification Screen:

• System equal to or larger than nominal 10 tons of cooling

• Building type and location

Project Delivery

•Customer or HVAC Service Contractor obtain equipment information

•Contact DEPACC system provider for equipment pricing

•Utility bill records & tariff information if available

•Prepare Economic ProForma: Energy at Risk or other tool

•Execute Installation Contract & submit for rebate

•Contact Cypress for assistance

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Page 15: Advanced Direct Evaporative Pre-Cooling for Air Cooled Condensers (DEPACC)

Contact Us

www.precoolandsave.com [email protected](877) 811-8700

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