By: Dr. Aoday Alrawy

What is Geothermal?

  • Geo means earth, thermal means heat
  • —The energy present under our feet is known as geothermal energy
  • —Near about 40-50% of total energy is stored inside earth surface
  • —This is the main source that utilized in geothermal heat pump

Earth Depth & Temperature By Month

Ground temperature remains constant all year long

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Heat Pump

The device which transfer heat to the system from  the surrounding with the application of energy and  vice versa.

The refrigerant may be R 22(Monochromo dychloro  methane) or R410a

COMPONENTS:

  • Compressor
  • Condenser  Expansion Valve
  • Evaporator

Geothermal Heat Pump

How does it work?

—The heat pump uses the geothermal heat as  main source is known as Geothermal Heat Pump. —Water is taken as refrigerant to carry out the  process.

Components

  • Ground Heat Exchanger
  • Heat pump
  • Air delivery system/Duct work
  • Desuperheater

Ground Heat Exchanger

The pipes are inserted into the ground act as heat  exchangers

TYPES:

  1. Horizontal Close Loop
  2. Vertical close Loop 
  3. Open loop 
  4. Lack/Pond close loop

Duct Work

This is the instrument that takes heat from/to  the room in Summer/Winter

Despurseheater

  • It is the instrument that acts as a water heater
  • It takes heat from the compression pipe
  • It reduces the  electricity bill
  • It provides free hot water for domestic use

Geothermal Heat Pump

Geothermal Heating

  • Room temperature is 10° C

     

  • Ground Temperature is 15° C

     

  • Heat is harvested and transferred to the room

The process is done in four steps:

  1. Evaporation-It evaporate water to vapor
  2. Compression-It compress the vapor at high temp. & pressure
  3. Condensation-It condense the vapor and make room temp.
  4. Expansion-It makes the vapor to form water.
  5. First process makes water refrigerant and last  process makes refrigerant to water

Geothermal Cooling

  • Room temperature is 45° C

     

  • Ground Temperature is 15° C

     

  • Heat is  transferred from the room to the ground

The process is done in four steps:

  1. Evaporation-It evaporate water to vapor
  2. Expansion-It makes the vapor to form water
  3. Compression-It compress the vapor at high temp. & pressure
  4. Condensation-It condense the vapor and make room temp

Geothermal Heating

Conclusion

Comparison Between Geothermal Heat Pump and Other Heat Pump

Pros

High COP (Coefficient of Performance)

Compared to domestic heat pump

Savings

Minimal or virtually no running cost and reduced electricity bill. A ground source heat pump will almost always save money on your monthly heating and cooling costs when compared to a gas or oil furnace, but the level of savings and payback period can vary based on your existing heating and cooling systems. For example, if you want to retrofit your property with geothermal and already have adequate ductwork in place, you won’t have to pay for additional components or labor to either install new ductwork or update your existing system, which can impact the total upfront cost of a new system.

Rebates and incentives

Subsidized by the government

Federal government will pay up to $5,000 if you make your home more energy efficient

Read More

Environment friendly

Green Energy

Piece of Mind

Clean, Safe & Noiseless

Cons

High upfront installation costs

Geothermal heat pumps can have significant upfront costs, especially if you need to install or upgrade ductwork on your property

Potential Landscapr Alteration

Installing a geothermal heat pump involves installing a ground loop system, which can lead to significant above-ground alterations. Particularly with horizontal loop setups, your installer will need to dig trenching over a wide surface area of your property that can change the setup and physical appearance of your property. Vertical ground loops have a smaller footprint, but still involve bringing heavy machinery onto your property.

Open-loop systems may contaminate groundwater

Open-loop geothermal systems are much less common than closed-loop installations, but in the event that you opt for an open-loop system, be aware that groundwater contamination is a possibility. Because open-loop systems cycle natural groundwater directly, there’s a chance that the water that passes through your heat pump and heat exchanger will contaminate the water source you’re pulling from