Real World Application of the Heat Machine

*What is a Heat Machine

*A chiller capable of producing water temperatures of low 40’s on the evaporator side and above 135° on the condenser side.

*Heat Machine Application

*Wherever there is a simultaneous demand for hot water and chilled water.

UAH Central Plant

•Serves app. 1 million square feet•Dorms, classrooms and research labs•Half a million square feet in research labs•Once through air has to be de-humidified•Accomplished by chilling air to 55 and reheating to maintain comfort conditions•Year round heating demand

*UAH Central Plant

*3600 tons of conventional cooling*1300 horsepower Natural gas/fuel oil boilers

Boilers

•Two 500 hp natural gas fire tube boilers•“Most efficient fire tube boilers in the state”•180 degree water, 190 degree stack temperature

Primary/Secondary Pumping

•Low Delta T syndrome•Characterized by:•Over pumping primary system•Higher chilled water supply temperatures•Forcing additional chillers on before chillers are fully loaded.

UAH Chilled Water Plant

UAH Heat Machines

Reasons for Heat Machine

•Lowest first cost option•Solved Boiler condensing •Reduced run time on boiler by 3•Reduced maintenance on boiler

•Essentially solved low Delta T syndrome

Why We Decided To Install Heat-Machines

•Allowed Us To Condition Our New Student Center From Our Existing Central PlantNo Square Footage Needed for Boiler in New BuildingNo Air-Cooled Chiller Near Building (Noise)•Lowest Design/Construction Option

Total Project Cost ~ $550,000•Added Cooling and Heating Redundancy•~ 400 Tons of Cooling (4,800,000 BTUH)•~ 180 Boiler Horsepower (6,000,000 BTUH)•Most Economical Way For Us to Make Hot Water

What Is The Product Of A Water To Water Chiller?

What Is The Product Of A Water To Water Chiller?

COLD WATER

What Is The BY-Product Of A Water To Water Chiller?

Warm/Hot

Water

What Is The BY-Product Of A Water To Water Chiller?

October 11, 2013 Heat-Machine Snapshot

What Is My Product – What Is My By-Product?

October 11, 2013 Heat-Machine Snapshot

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*Coefficient Of Performance

COP is the ratio of the heating or cooling provided over energy consumed

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* COP - COOLING

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*COOLING Example 1 (Snapshot in time)

VAC AMPS BTUH4160 1.73 76.7 3.412 1,883,405

COP3.821333

GPM CHWRT CHWST DT GPH Weight2000 50.7 43.5 7.2 60 8.33 7,197,120

WORK IN

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* COP - HEATING

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*HEATING Example 1

COP is the ratio of the heating or cooling provided over energy consumed

*Electric Boiler/Water Heater ~100% Efficient *1 KWH = 3,412 BTUs *COP = ~1

ElectricityBTU/KWH

BTUs IN 3412BTUs Out 3412

COP = Heat Out / Work InCOP = 3412/3412COP = 1

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*HEATING Example 2

COP is the ratio of the heating or cooling provided over energy consumed

*Natural Gas Boiler Combustion Efficiencies *Fire Tube Boiler – 83 to 85%

*COP = .85 Nat. GasBTU/cf

BTUs IN (W) 1027BTUs Out (Q) 873

COP = Heat Out / Work InCOP = 873/1027COP = 0.850048685

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*What Would The Formula To Calculate COP Look Like If We Had An Application For Using Both Hot Water (Product) and Chilled Water (Byproduct) Simultaneously?

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* COPTotal = COPHEATING + COPCOOLING

Current Fuel Cost

For 1,000,000 BTUsElectricity $25.25

Nat. Gas $8.02 #2 Fuel Oil $24.51

Current Fuel Cost

For 1,000,000 BTUsElectricity $25.25 ____with COP of 7.09

Nat. Gas $8.02 $9.22 if used in 85% eff. Boiler COP 0.85

#2 Fuel Oil $24.51 $28.84 if used in 85% eff. boiler COP 0.85

Current Fuel Cost

For 1,000,000 BTUsElectricity $25.25 $3.56 with COP of 7.09

Nat. Gas $8.02 $9.22 if used in 85% eff. Boiler COP 0.85

#2 Fuel Oil $24.51 $28.84 if used in 85% eff. boiler COP 0.85

COP TREND DATA

BTU s

HEATING RESULTS TO DATE (01-16-14)

BTU s

Product:13,395,000,000 BTUs

COOLING RESULTS TO DATE (01-16-14)

By-Product:108,322,148,000 BTUs902,679 Ton Hours

Tons

WATER SAVINGS TO DATE (01-16-14)

2,040,054 GALLONS$3,162.08Chemical Savings Yet To Be Determined.

$130,000.Cumulative

Savings Since Installation

$

May 13TH To

January 16TH

198,000Projected Annual

Savings Rate

$

2.5 to 3 Projected Payback

Years

0 years?

Questions