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Direct heat utilization of geothermal energy
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1000 years of use (Romans)

60 resorts

460,000 patients/year

USA used by Indians for 10,000 years

The Great Spirit

Neutral ground

Recuperated from battle

Today 115 major geothermal spas

Hot Springs National Park, Arkansas

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Direct heat utilization of geothermal energy

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Direct heat utilization of geothermal energy

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Direct heat utilization of geothermal energy

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Glenwood Springs, Colorado

Glenwood Springs, Colorado

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Space Conditioning

Space Conditioning

Individual wells for a building or several buildings using pumps or downhole heat exchangers

Klamath Falls, Oregon

Reno, Nevada

Rotorua, New Zealand

Taupo, New Zealand

Several Places in Turkey

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Space Conditioning

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Space Conditioning (2)

Space Conditioning (2)

District heating in at least 12 countries

Piping system

Single pipe once through system disposal

Environmental problems

Two pipe recirculation residual heat conserved

20 to 30% more expensive

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District Heating  Examples

District Heating Examples

Started 1930

190,000 people

89o to 125oC water supplied at 80oC

Adequate to 26oC

830 MWt

62 wells

Large storage tanks for peaking

Oil fired booster station

Reykjavik, Iceland

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District Heating  Examples

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1930s

1930s

1980s

Today

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District Heating  Examples (2)

District Heating Examples (2)

60o to 100oC

Doublet wells 1,500 to 2,000 m deep

500,000 people 40 projects

Heat pumps and fossil fuel boilers assist to provide 70oC water to user

Paris Basin (Melun), France

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District Heating  Examples

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Suwa, Japan

Suwa, Japan

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Agribusiness Applications

Agribusiness Applications

Greenhouse heating (flowers, vegetables, tree seedlings)

Up to 35% savings due to heating costs

Animal pen heating and cleaning

Soil warming

Crop irrigation

Mushroom raising

Soil and mulch sterilization

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