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Real World Application of the Heat Machine. A chiller capable of producing water temperatures of low 40’s on the evaporator side and above 135° on the condenser side. What is a Heat Machine. Wherever there is a simultaneous demand for hot water and chilled water. Heat Machine Application.

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Presentation Transcript
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.

What is a Heat Machine
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
uah central plant1

3600 tons of conventional cooling

  • 1300 horsepower Natural gas/fuel oil boilers
UAH Central Plant
boilers

Two 500 hp natural gas fire tube boilers

  • “Most efficient fire tube boilers in the state”
  • 180 degree water, 190 degree stack temperature
Boilers
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.
Primary/Secondary Pumping
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
Reasons for Heat Machine
why we decided to install heat machines

Allowed Us To Condition Our New Student Center From Our Existing Central Plant

    • No Square Footage Needed for Boiler in New Building
    • No 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
Why We Decided To Install Heat-Machines
slide16

October 11, 2013 Heat-Machine Snapshot

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

coefficient of performance
Coefficient Of Performance

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

heating example 1

Electric Boiler/Water Heater ~100% Efficient

    • 1 KWH = 3,412 BTUs
      • COP = ~1
HEATING Example 1

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

heating example 2

Natural Gas Boiler Combustion Efficiencies

    • Fire Tube Boiler – 83 to 85%
      • COP = .85
HEATING Example 2

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

slide24

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?

current fuel cost

For 1,000,000BTUs

Electricity $25.25

Nat. Gas $8.02

#2 Fuel Oil $24.51

Current Fuel Cost
current fuel cost1

For 1,000,000 BTUs

Electricity $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
current fuel cost2

For 1,000,000 BTUs

Electricity $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

Current Fuel Cost
heating results to date 01 16 14

BTUs

Product:

13,395,000,000 BTUs

HEATING RESULTS TO DATE (01-16-14)
cooling results to date 01 16 14

By-Product:

108,322,148,000 BTUs

902,679 Ton Hours

Tons

COOLING RESULTS TO DATE (01-16-14)
water savings to date 01 16 14

2,040,054 GALLONS

$3,162.08

Chemical Savings Yet To Be Determined.

WATER SAVINGS TO DATE (01-16-14)
slide33

May 13TH

To

January 16TH

$130,000.

$

Cumulative Savings Since Installation

slide34

198,000

$

Projected Annual Savings Rate

slide35

0 years?

2.5 to 3

Years

Projected Payback