geopimed course 01: introduction to geothermal energy by aniol esquerra from ecoserveis
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Geothermal Energy
Introduction to Geothermal Energy
How to explain it?
Low Enthalpy Temperature Geothermal Energy How GSHP Geothermal Energy can help us to save energy and money
Reminder
Target groups:
Technical workers
Decision makers
General public
Barriers
How to communicate
Index
Introduction
Nyquist Theory of tectonic plates
Thermal Load Analysis of a building
Calculation of cooling systems for adiabatic heating transfers
Final Evaluation
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
INTRODUCTION: GEOPIMED
Introduction
Ecoserveis
NPO
Fuel Poverty, Energy Efficiency, Clean Energies
www.ecoserveis.net
GEOPIMED Project
Partners
Objectives
HOW EARTH IS MADE
Geology of the planet
How earth is made
In fact we drilled a short range of the earth. All wells are only reaching the lithosphere.
How earth is made
Under the lithosphere, there is a convection movement which makes the heat propagate easily.
How earth is made
Where there is underground water near a hot spot you can find steam and hot water at high pressure.
POSSIBILITIES OF GEOTHERMAL ENERGY
Different installations
Possibilities of GE
Possibilities of GE
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
Medium-Low temperature GE is useful to heat directly the house. As the last example, you need a hot spot near.
Possibilities of GE
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
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
PRINCIPLES OF THE HP
How does a HP work?
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
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.
HP operation
40 ºC
35 ºC 10 ºC
15 ºC
Summer mode
Interior 27ºC Exterior 30ºC
40 ºC
35 ºC 10 ºC
Winter Mode
15 ºC
Exterior 15ºC Interior 21ºC
HP operation
40 ºC
35 ºC 10 ºC
Problems with cold or hot weather
15 ºC
Exterior 5ºC Interior 21ºC
HP operation
GEOTHERMAL ENERGY FOR HOUSING
How to use it in buildings?
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.
GE for housing
Examples
GE for housing
Examples
GE for housing
Examples
GE for housing
Exemples d’instal·lacions
GE for housing
Examples
GE for housing
In this case they drilled 7 wells of 100m of depth.
GE for housing
GE for housing
GE for housing
GE for housing
GE for housing
GE for housing
Hot to distribute this energy to the house?
GE for housing
Hot to distribute this energy to the house?
CASE STUDY
Cost?
Savings?
Where?
Case study
House with a little garden
200 m2
81 m2 for HVAC
100 years
4 tenants
Cooling - Heating - HW
Case study
Thermal needs
1,15 kW - 1,4 kW per 10m2 cooling
1 kW/10m2 heating
60 W per person HW
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
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
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!
QUESTIONS
Thanks for your attention
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