Geothermal HVAC and power systems use Earth temperature for heat exchange. While temperature variation occurs in atmosphere, temperatures underground remain constant.
In a geothermal HVAC system, an electrically powered heat pump cycles fluid, usually water or refrigerant, through long loops of underground pipes. It is through this process that heat is transferred from ambient air in the building to the ground and vice versa
During the winter, the heat pump sends fluid through the pipes where the warmer rock, soil, or water underground increases the temperature of the fluid. The warm fluid is then pumped back to the building. A heat exchanger can then transfer the heat from the fluid to the building’s heating system to warm the air.
A desuperheater can be used to increase the temperature of water for use in the building. The process is then repeated, with the cooler fluid being pumped back into the ground to be warmed and then returned to the building for heating.
Reasons for using a ground coupled system.
Complete energy modelling analysis of premises which includes 8760 hours of energy simulation with 3D modelling of structure Based on Geographical data, peak load and total HVAC load of all the months are simulated for given site conditions.
|TType of system||Open Bore well Re-circulating|
|Construction time||3 months|
|Savings in energy||Since trial operation started. 64% during trial run.Target = 75%|
|Particulars||Unit||VRV Air Cooled||VRV Water Cooled GHP|
|Area to be Cooled||Sq. Ft||200||200|
|Area Covered per Ton||T/Sq. Ft||140||140|
|Cost Per Tonne (Assumed)||Rs||85,000||145,000|
|Total Cost of System||Rs||121,429||207,143|
|Total Energy Consumption||kWh/p.a.for 12 Hours||6,883||2,816|
|Decrease in Energy Consumption||kWh/p.a.||4,067|
|Cost of Electricity||Rs./kWh||9.00|
|Annual Savings on Electricity||Rs.||36,604|
|Pay Back period for Incremental Cost||Years||2.34|
|Pay Back period for Total Cost||Years||5.66|
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