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W hen the air conditioning system at t he Texas Department of Transportations (DOT) Houston Annexbroke down during a hot Houston summer, officials seized the opportunity t o upgrade the HVAC equip-ment. They w anted equipment that could provide reliable, round-the-clock cooling under demandingconditions. In addition, they w anted equipment that w as energy efficient, environmentally responsi-ble, quiet and compatible with their existing Carrier Comfort Network (CCN) controls.

Carriers air-cooled Ecologic screw chiller, used in conjunction w ith existing CCN controls, helpedthe Texas DOT cut energy costs at the Houston annex in half. The four-st ory 35,000 sq. ft. building isnoticeably cooler wit h the new equipment. The state agency w as proud to be the first installat ion sitein N orth Am erica for t he air-cooled Ecologic chiller, w hich uses environmentally responsible, chlorine-free refrigerant HFC-134a.

Carrier Ecologic Chiller Cuts Texas

DOT Energy Costs by 50%

Carriers Ecologic chiller, combined with existing CCN Controls,cut energy costs by an impressive 50%.

Case Study Texas DOTCase Study Texas DOT

AIRSIDE/APPLIED/ CONTROLS/SERVICE/SPECIAL SOLUTION/TOTAL SYSTEM/UNITARY

EDUCATION/HEALTH CARE/LODGING/MANUFACTURING/OFFICEBUILDING/RETAIL/SPECIA

Project Objectives

SolutionEnergy Costs

50% Savings

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The Houston distr ict of the Texas DOT is the largest distr ict in a large state w ith the very large job ofkeeping traff ic moving throughout the sprawling metropolis. Keeping its 300 employees cool, comfortableand productive in the citys hot cl imate is both a challenge and a necessity. So when t he air conditioningsystem at the four-story 35,000 sq. ft. Houston annex broke down, off icials immediat ely moved to upgradethe HVAC system. HVAC M echanical set up a temporary system w hile preparations were made to installthe new system. The facil i ty team was looking for equipment that w as reliable, eff icient and environmen-tally responsible. And because the chil ler pad sits outside the buildings conference room, sound w asa key consideration.

Proactive about environmental issues, the department chose Carriers air-cooled Ecologic screw chil ler,engineered from the ground up t o use the chlorine-free refrigerant HFC-134a. The Ecologic features low -noise 06N tw in-screw compressors and aeroacoustic fans, ensuring quiet operation and low vibration reducing complaints from tenants and neighbors. Its compact design, w ith a footprint up to 50% smallerthan most of the chil lers it replaces, makes it easy for contractors to rig and set up.

Another decision driver w as the fact that the chil ler w as compatible w ith Carrier Comfort Net w ork (CCN)controls, already installed at t he Houston annex. The Ecologic chil ler features cable-ready boards to makethe connection easy. M uch l ike the traff ic alert systems used by the DOT to direct motorists to less con-gested roadw ays, CCN alerts the building manager to potential problems before they become big problems,helping to direct cooling where it s needed most. This equipment helps us to save up to 50% on energycosts, key for a state government department intent on doing more for the taxpayers w hile saving themmoney, said O.D. Shelton, building manager f or the Houston distr ict of the Texas DOT.

Less than an hour after the Ecologics start-up, the four-story building w as noticeably cooler and the t raff ic

engineering, road, and building maintenance personnel much happier. W hen you combine the chlorine-free refrigerant, low sound levels, smaller footprint, controls compatibil i ty and overall reliabil i ty, you have acant miss system, said Bruce Orcutt, systems sales consultant f or Houston distr ibutorship AutomaticEquipment Sales. It s a very impressive system.

Project Synopsis

Ive been in this business40 years and Ive alw ays

specified Carrier equipmentfor its reliability and serv-

ice. I like the design of thischiller, the fact that i ts very

quiet, is compatible wit hour CCN controls and that

w e dont have to w orryabout refrigerant

phase-out.

O.D. Shelton,building manager,

Houston district,Texas DOT

200 0 Car ri er Corpo rat ion 05/ 00 811- 1001

For more information, contact your nearest Carrier Representative, call 1.800.CARRIER or visit our web site at www.carrier.com

Project Summary

Location: Houston, TX

Building Age: 30+ Years

Project Type: Retrofit

Building Type/Size: Brickconstruction/Four-story,35,000 sq. ft.

Building Usage: Offices,conference rooms

Objectives: Efficient, reliable,round-the-clock cooling under

demanding Houston tempera-tures

Major Decision Drivers:Energy efficiency; sound;compatibil i ty with existingCCN controls; eliminatew orry of refrigerantphase-out

Design Considerations:Chillers compact footprint

w as half the size of the chil lerit replaced, making it easy forcontractors to rig and set up

Total Cooling (tons): 11 6

HVAC Equipment: Model30GX Ecologic screw chil ler

Unique Features: First air-cooled Ecologic chil ler installed

in North America

Project Cost Range:Less than $100,000

Installation Date: Summer,1996

Contractor: HVAC M echanical,Inc.

Case Study Texas DOT continued

AIRSIDE/ APPLIED /CONTROLS/SERVICE/SPECIAL SOLUTION/TOTAL SYSTEM/UNITARY

EDUCATION/HEALTH CARE/LODGING/MANUFACTURING/ OFFICEBUILDING / RETAIL/SPECIA