Geo Exchange Heat Pump

GEO-EXCHANGE HEAT PUMP GUIDED BY: C.A. PATEL PREPARED BY : MADIA NISHIT V.

Introduction 

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What is geothermal energy??

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Heat from higher pressure steam coming from within the earth.

Geothermal Heating and Cooling System and Operation Different Applications  Heat Pump Terms  How They Work  Operating Costs  Links 

Water-Source Heat Pump Applications 

Water-Source Heat Pumps have been in use in large commercial and office buildings, interconnected with cooling towers and boilers, for many years. Popular configurations now include:

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ü Using well water in open-loop systems ü Using closed loops in vertical geo-exchange systems. ü Using closed loops in horizontal geo-exchange systems.

HOW DOES IT WORK

Well water in open loop systems Ground water is pumped from one well to the heat pump(s).  Heat is extracted from (or rejected to) the water.  The water is then returned to another well, or discharged to the surface. 

Closed loop with vertical heat exchangers Heat pumps use the same fluid over and over.  The fluid circulates within closed loops, installed in deep wells.  As the loop temperature changes, heat is exchanged to (from) the earth. 

Closed loop in horizontal heat exchangers 

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The same fluid (antifreeze solution) is used over and again. Loops are buried horizontally in trenches, six feet deep or deeper. Heat is extracted from the earth when the loop temperature is colder than earth temperature.

Closed loop with pond heat exchangers The heat pumps use the same fluid over, as with other closedloop systems.  Loops are placed at the bottom of a large pond, and heat is extracted from the pond water. 

In Commercial Buildings Heat Pumps Share Heat Within Offices often contain heat-generating equipment, like computers, copiers and lights.  Some sections of a building need cooling when other sections need heat.  Heat pumps extract heat in the areas that need cooling, warming the water in a common loop.  Other heat pumps give that heat to the areas that need heat, cooling the common loop.  A large chiller and a boiler keep the loop temperature within a set range. 

Operating Costs Operating cost for heating and cooling a 3,200 square foot house, with a closed loop vertical system, should average about $1,800.00 per year.  Average monthly cost can vary from $36.00 / month to $316.00 / month. 

Compare Operating Costs Closed-Loop Geothermal heat pump, at 17 cents / KWH, costs about $1,800.00 per year to heat and cool the 3,200 sq. ft. house.  Straight electric heat, at 17 cents / KWH, would cost over $6,070.00 per year for the same house.  Fuel oil at $4.00 / gallon, burned in an 80%efficient furnace, with a 12-SEER air conditioner, could cost over $5,000.00 per year. 

Environmental Advantages Heat pumps do not burn fossil fuel. There is no air emission.  ¾ of the heat comes from the earth, and is renewable.  The antifreeze used in closed loop systems is propylene glycol, the non-toxic type used in recreational vehicles.  The water used by open loop systems is returned to the earth unchanged, except for heat. 

Conclusions 

GeoExchange technologies have evolved considerably since their beginnings

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 Compare

  Safety

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Combustionbased 

 

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Installation  Cost 

Operating  Cost 

Maintenance  Cost 

Life-Cycle Cost 

A Concern Moderate

Moderate

High

Moderate 

Heat pump

Excellent 

Moderate

Moderate

Moderate

Moderate

Geoexchange

Excellent 

High

Low

Low

Low

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GX playing increasingly larger role in sustainable buildings and in reduction in CO2 emissions

LINKS [1] [2] [3] [4] [5] 

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www.Google.com www.Wikipedia.com www.Igshpa.okstate.edu www.Ecoiq.com www.msn-Encarta.in

THANK YOU