A Simple Principle

Hot outside air is cooled as it passes through the frame, before it reaches the condenser coils. This is done by spraying water and using evaporative cooling. This is same principle as cooling towers.

This allows the system to operate as though it were cooler outside than it actually is. On recent 100 degree days (73 wet bulb), in a humid Southeastern U.S. climate, the leaving air temperature of the system entering the condenser is 79.2 degrees!

Using Evaporative Space Cooler (AKA “Swamp Cooler”)

Standard Air Conditioned Space

81° and 85% relative humidity

55°

Dehumidifed

Air

Standard Unit Unit with Pre-cooler

Using Evaporative Space Cooler (AKA “Swamp Cooler”)

Standard Air Conditioned Space

81° and 85% relative humidity

55°

Dehumidifed

Air

95° to 100°+

81.5°

The Systems: • Reduce Energy Use. Typically 20%+ of

compressor energy. Typically 2-4 Year Paybacks

• Reduce Demand Charges

• Reduce Overall Maintenance

• Increase tonnage capability

• Reduce Head Pressure

• Increase system reliability

• Protect Coils from Dust, Debris and Damage

• Extend the life of HVAC equipment

• Minimal Maintenance.

Helps keep building comfortable even when 100

degrees plus outdoors

Modest water usage

Financing available so that the system can “Pay For

Itself”

Water is typically NOT sprayed directly on the condenser coils. In addition, the water is usually treated to remove minerals (calcium and magnesium mainly). Pressure usually provided by domestic water pressure. Booster pump can be used if needed.. Air pressure drop thru media needs to be minimized.

Sensors Microprocessor

Houston, TX

Sample Installations

Air-Cooled Chillers

Atlanta, GA

Sample Installations

RTU

El Dorado Hills, CA

Sample Installations

RTU - High Efficiency DX-Style

Memphis, TN

Sample Installations

Remote Condensing Units

Horizontal EZ-Frame Installation

El Dorado Hills, CA

Sample Installations

Refrigeration Units

Customer Case Studies

The following case studies demonstrate energy savings.

TESTING PROCEDURES All data is sorted according to the Cooling Degree Days… Definition: COOLING DEGREE DAY (“CDD”)

A unit used to relate the day's temperature to the energy demands of air conditioning. One cooling degree day occurs for each degree the daily mean temperature is above 65° Fahrenheit.

Examples:

Day 1 Day 2 Day 3

Min 60° 70° 75°

Max 80° 90° 105°

Mean 70° 80° 90°

- 65° - 65° - 65°

CDD 5 15 25

TESTING PROCEDURES Step 1: Baseline Testing Prior to installation of the system, a data logger* is installed on the subject HVAC equipment to collect all applicable real-time energy consumption and unit performance information. The duration of this test depends upon the weather at the location, but will typically last at least 2-3 weeks.

Step 2: Installation of the system

Step 3: Comparison Testing After application of the system, real-time energy consumption and unit performance data is collected. The duration of this test typically mirrors the duration of the baseline testing, but is also highly dependent on the weather.

Step 4: Data Analysis Once complete, all data is collected and analyzed by our in-house engineering department. all data is sorted by Cooling Degree Day, as provided by the National Oceanic and Atmospheric Administration. The average kWh consumed during the baseline testing period is then compared that consumed after installation of the system.

*All data was collected using either an Amprobe Data Logger (Model DM-II Pro) or a Satec Event & Data Logger (Model #EDL172XR or EDL174).

Unit Description: 40 Ton Packaged Condensing Unit

Location: Cypress, TX (Houston Area)

Date of Testing: Summer of 2008

Customer: Large Telecom Company

CASE STUDY #1

Summary of Results

CDD % Savings

14 19.5%

16 29.5%

17 31.1%

19 21.5%

20 19.3%

21 20.3%

22 17.5%

CASE STUDY #1

500

450

400

350

300

250

200

150

100

50

0

339

239

363

250

393

308

395

319

425

338

Cooling Degree Day (CDD)

Without System

16 19 20 21 22

With System

14

352

283

kW

h

17

332

402

Percent savings on case study is based on entire unit including condenser fans.

Unit Description: 20 Ton Rooftop Unit

Location: Sylmar, CA

Date of Testing: Summer of 2012

Customer: Verizon Wired

CASE STUDY #2

Summary of Results

CASE STUDY #2

Savings = 16585.5834 kWh

% Savings = 22.54% kWh

Demand Savings = 5.634 kW

Saving/ Ton = 0.28 kWh/ton

% Demand Savings = 20.28%

Unit Description: 70 Ton Chiller

Location: Prattville, AL

Date of Testing: Summer of 2009

Customer: State Retirement System

CASE STUDY #3

P

Summary of Results

Kw

h

1700

1600

1500

1400

1300

1200

1100

1000

900

800

1,061

Cooling Degree Day (CDD)

Without system With system

16 18 19 22

1,249

1,315

1,074

1,429

1,098

1,579

1,213 16 15.1%

18 18.3%

19 23.2%

22 23.2%

CDD % Savings

CASE STUDY #3

Percent savings on case study is based on entire unit including condenser fans.

Additional Savings

Additional financial benefits include:

1. Peak Demand Reduction;

2. Maintenance Savings;

3. Reduced Equipment Failure;

4. Increased Equipment Life;

5. Available Tax Benefits; or

6. Potential for Utility Rebates.

The previous case studies only demonstrate savings from kWh reduction

“A … dirty condenser coil can

increase compressor energy

consumption by 30%.”

- Federal Emergency Management Program Fact Sheet

REDUCED MAINTENANCE

“If the coil is dirty …. [t]his raises

your electricity cost for air

conditioning and may shorten the

life of the outdoor condensing

unit.”

- Saturn Research Management

Cleaner coils means more efficient operation.

REDUCED MAINTENANCE

Properly cleaning condenser coils requires:

• Hours of labor spent taking equipment apart and pressure washing coils.

• Taking the unit “off-line” for this period.

• Using caustic chemicals on your facilities and handling chemical runoff.

• Immediately after cleaning, the unit begins to collect dirt once again.

• Coils are professionally cleaned upon installation, and immediately sealed off from outside air.

• Dirt and debris are prevented from entering the system.

• Projects can go years without cleaning coils.

Water Conservation

• The National Renewable Energy Lab (NREL) reports: “U.S. electricity production consumes over 20 gallons of water per KWH created.

• Other studies confirm this water usage and state that depending upon the power plant type, the water usage can range from 10 gallons to 25 gallons of water consumed per KWH created.

• The system uses approximately 1.9 gallons of water for each KWH saved. This saves approximately 90% of water usage while saving electricity

• Based on national averages, on a 75 ton hvac unit, the system will use $78 of water in a year, while saving over $7,000 annually in electricity.

• By reducing electricity demand and consumption, evaporative cooling actually SAVES water on a global scale!”

Weather Underground Memphis 2012 45 Days at 95 degrees and above, 11 Days at 100 degrees and

above. Temperature on roof is even higher.

2012 Temp. (°F) Dew Point (°F) Humidity (%)

Sea Level Press.

(in) Visibility (mi) Wind (mph)

Preci

p. (in)

Event

s

Jan high avg low high avg low high avg low high avg low high avg low high avg high sum

1 65 54 42 57 36 19 84 60 35 30.43 30.22 29.94 10 10 10 29 14 39 0.00

2 43 38 32 20 12 4 47 35 22 30.50 30.45 30.40 10 10 10 28 15 38 0.00

3 41 32 23 16 10 5 55 40 25 30.61 30.48 30.32 10 10 10 15 5 20 0.00

4 54 43 31 36 27 13 79 60 41 30.34 30.24 30.16 10 10 9 18 8 26 0.00

5 63 48 32 33 30 24 89 57 25 30.29 30.19 30.06 10 10 10 14 5 23 0.00

6 69 54 39 56 46 32 93 71 48 30.08 30.00 29.94 10 10 10 20 10 30 0.00

7 61 57 52 55 47 28 93 66 38 30.13 30.04 29.95 10 8 0 16 7 26 T Rain

8 57 53 48 41 36 28 68 53 38 30.18 30.13 30.10 10 10 10 16 7 21 T Rain

9 57 52 47 45 41 38 86 74 61 30.19 30.14 30.08 10 10 8 12 7 15 T

10 59 55 51 54 49 37 93 76 59 30.08 29.82 29.64 10 7 0 16 10 22 0.36

Rain ,

Thun

derst

orm

Some details of the system include: 1. Dramatically reduces the entering condenser air temperature. These systems have had a U.L. testing analysis and thousands of systems operating successfully. On a humid, 95db/78wb outside design day, the system will cool this air to approximately 82 degrees db. Depending upon unit type, this reduces the energy usage by 20-22% or more. 2. KW demand is reduced 3. Due to the filter media, dirt in the air is prevented from reaching the condenser coil. This saves on annual condenser coil cleaning labor. It also increases efficiency. 4. Since the units run at a lower condensing temperature, repairs are minimized. The reason air cooled units typically require considerably more repairs in the heat of the summer is because of the high condensing temperatures and pressures that normally are experienced. Prevents high condenser pressure “tripping” problems 5. With the reduced condensing temperatures and pressures of the system, equipment life can be extended. 6. Typical payback periods, only counting the energy savings, are approximately 2 to 4 years. Rebates and incentives are available in many locations. 7. This is one of the few technologies that increases energy efficiency but at the same time does not negatively affect the room temperature. 8. Cooling capacity increased approx. 8-12 percent.

9. Large potential impact on our country’s energy usage. Comparable to the entire solar market that currently

does not have good financial paybacks.