This document provides information about geothermal energy and how geothermal heat pump systems can be used for heating and cooling buildings. It discusses: 1) An introduction to geothermal energy and the European GEOPIMED project which aims to promote its use. 2) How geothermal heat pump systems work by exchanging heat with the shallow subsurface using a refrigeration cycle, allowing heating and cooling with less energy than conventional systems. 3) A case study of installing geothermal systems in a 200 square meter house, estimating installation costs of 10,780 euros and annual savings of 2000 euros, resulting in a payback period of 5 years.

1. Geothermal Energy
Introduction to Geothermal
Energy
How to explain it?

2. Low Enthalpy
Temperature
Geothermal Energy
How GSHP Geothermal
Energy can help us to save
energy and money

3. Reminder
 Target groups:
 Technical workers
 Decision makers
 General public
 Barriers
 How to communicate

4. Index
 Introduction
 Nyquist Theory of tectonic plates
 Thermal Load Analysis of a building
 Calculation of cooling systems for
adiabatic heating transfers
 Final Evaluation

5. What we’ll really do
 Introduction about the European
project GEOPIMED and Ecoserveis
 How earth is made
 Possibilities of the geothermal energy
 Principle of operation of a Geothermal
heat pump for heating and cooling
 House, case study: What to do? How
much does it cost? Savings?
 Questions

6. INTRODUCTION:
GEOPIMED

7. Introduction
 Ecoserveis
 NPO
 Fuel Poverty, Energy Efficiency, Clean
Energies
 www.ecoserveis.net

8. GEOPIMED Project
 Partners
 Objectives

9. HOW EARTH IS MADE
Geology of the planet

10. How earth is made
In fact we drilled a short range of the earth. All wells are only
reaching the lithosphere.

11. How earth is made
Under the lithosphere, there is a convection movement which
makes the heat propagate easily.

12. How earth is made
Where there is underground water near a hot spot you can find
steam and hot water at high pressure.

13. POSSIBILITIES OF
GEOTHERMAL ENERGY
Different installations

14. Possibilities of GE

15. Possibilities of GE

16. High Temperature GE is a good resource to produce electricity.
However you need specific conditions and it is not feasible for houses.
Possibilities of GE

17. Medium-Low temperature GE is useful to heat directly the house.
As the last example, you need a hot spot near.
Possibilities of GE

18. Possibilities of GE
 They are expensive and the drilling
depth is between 1,000 and 3,000
meters
 They can only be done in very
specific places, where the
temperature of the subsoil is high
and they usually serve only to heat or
produce electricity
 These two applications do not
correspond to low temperature GE

19.  The third application is based
on a fact quite simple
 The first meters deep, the T °
is constant and equal to the
annual average
 In our case is 18 °C
 We will later how we can
benefit from this
Possibilities of GE

20. PRINCIPLES OF THE HP
How does a HP work?

21. Principles of the HP
 An air conditioning does not produce
nor cold nor heat but moves
temperatures
 The basic principles are:
 A gas, whenever compresses, heats
 A gas, whenever expands, cools

23. Principles of the HP
 The great advantage is that it
requires less energy to heat and cool
 With a wattage of 100W you can
produce 300W of heat or cooling
 COP is the Coefficient of
Performance.
 It is usually 2-3 in a normal air
conditioning.

24. HP operation
40 ºC
35 ºC10 ºC
15 ºC
Summer mode
Interior 27ºC Exterior 30ºC

25. 40 ºC
35 ºC10 ºC
Winter Mode
15 ºC
Exterior 15ºC Interior 21ºC
HP operation

26. 40 ºC
35 ºC10 ºC
Problems with cold or hot weather
15 ºC
Exterior 5ºC Interior 21ºC
HP operation

27. GEOTHERMAL ENERGY
FOR HOUSING
How to use it in buildings?

28. GE for housing
 It is a HP, like an air conditioning, but
modified. It is not a complicated system.
 The main difference is that the HP is not
throwing the heat or cold to the air but
to the subsoil instead.
 Because the subsoil is “always” at 18 ºC,
we don’t have the problems mentioned
before and it is more efficient.
 You can use it in any kind of subsoil.

29. GE for housing
 Examples

30. GE for housing
 Examples

31. GE for housing
 Examples

32. GE for housing
 Exemples d’instal·lacions

33. GE for housing
 Examples

34. GE for housing
In this case they drilled 7 wells of 100m of depth.

35. GE for housing

36. GE for housing

37. GE for housing

38. GE for housing

40. GE for housing

41. GE for housing
 Hot to distribute this energy to the
house?

42. GE for housing
 Hot to distribute this energy to the
house?

43. CASE STUDY
Cost?
Savings?
Where?

44. Case study
 House with a little garden
 200 m2
 81 m2 for HVAC
 100 years
 4 tenants
 Cooling - Heating - HW

45. Case study
 Thermal needs
 1,15 kW - 1,4 kW per 10m2 cooling
 1 kW/10m2 heating
 60 W per person HW

46. Case study
 Thermal energy for 81 m2
 11 kW cooling
 8 kW heating
 0,24 kW HW
 Yearly consumptions
 18.000 kWh/year Gas - Heating
 8.500 kWh/year Electricity - Cooling
 2.600 kWh/year HW

47. Case study
 Investment
 Simple Figures -> 1.400 € per kW
 15.400 € + VAT
 Government Funds: 1.400 €/kW
 Maximum 30% of total cost
 Total including funds 10.780 € + VAT

48. Case study
 Savings
 Currently the expenses are:
 1.440 €/year in gas
 1.695 €/year in electricity
 After the renovation:
 822 € in electricity for heating
 339 € in electricity for cooling and HW
 Every year 2000 € of savings
 We will recover the investment in 5
years!

49. QUESTIONS
Thanks for your attention