Basic Geothermal Info- Read this first!!!
Last Post 26 Feb 2008 01:40 PM by geodean. 0 Replies.
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26 Feb 2008 01:40 PM

Here are the answers to a lot of the questions that are asked by newcomers to this board.


Here are some links that give basic geothermal information:

Frequently asked questions

Introduction to Geothermal Systems


Just How Much More Efficient are GeoExchange Heat Pumps?

GeoExchange Systems The New Heating, Ventilation and Air-Conditioning (HVAC) Technology

The technology of Geothermal Heat pumps

A number of factors affect the reliability of geothermal heat pump systems. Good design, quality equipment, and competent installers are key.

Several of the most important considerations are:

  1. Establishing proper geothermal design criteria, including:
      Pay Attention! For ground-coupled systems - ground temperature, type of soil or rock, and moisture content.
      Pay Attention! For ground water systems - temperature, quality, and flow rate of well or other water supply.
  2. Properly determining the building's cooling, heating, and domestic or service hot water design loads.
  3. Properly sizing and selecting the heat pump system, using ARI-Certified heat pump models, and properly designing the overall system including duct and air outlet and return components.
  4. Correctly designing the hydraulic system, including the well pumping system or the ground loop heat exchanger system with pump.
  5. Properly installing and wiring all the system components. There is no substitute here for a knowledgeable and competent installation contractor!
  6. Adequately commissioning the system. Which includes:
      a) Cleaning and testing the system,
      b) Placing into initial operation,
      c) Measuring the performance,
      d) Comparing the actual results with the anticipated results, and
      e) Making the final corrections and fixes.
  7. Thorough instruction for the owner or operator on how to start, operate, and shut-down the system.

Here is a diagram and description of how a heat pump works.

As you can see by blowing air across the evaporator, you get cool air and by blowing air across the condenser you get warm air.

A fridge is a good example of this.  It cools the inside of the fridge and heats the room all at the same time.

In a heat pump the same coil is both the evaporator and condenser, just the fluid flow is reversed.

In winter, heat is taken from the ground to vaporize the freon which after being compressed transfers heat to the house by condensing

In summer, heat is taken from the house to vaporize the freon which gives up the heat to the ground by condensing.

This is a short explantion,  but covers the basics of heat pump operation.

If you want to learn more and evaporating and condensing go here.
 or here

Hope this helps
Dewayne Dean

<br><br>Why settle for 90% when you can have 400%<br>We heat and cool with dirt!<br>visit- to see my system
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