This document summarizes the energy efficiency and cost analysis of a residential home that uses a geothermal heat pump system compared to an air conditioning system. The 750 square meter home uses geothermal heat pumps for heating, cooling and domestic hot water. Thermal and cooling loads were calculated to be 45kw and 65kw respectively. Using geothermal saves an estimated 2,386 euros or 63.64% per year compared to an air conditioning system. The geothermal system has a payback period of 1.79 years based on its higher upfront cost of 88,120 euros versus 64,240 euros for an air conditioning system. Geothermal provides benefits like constant temperature regulation regardless of outside climate and long equipment life

1. Residential House Energy Class A
Building characteristics
The residential house in photo has been certified as energy class A+. The total
covered building
area is 750m2
consisting of two
floors.
Downstairs we
have the
swimming pool
outside in the
garden.
Dimensions of
the pool are
25x5 and the
volume is
180m3. There’s
also a large living
room, kitchen, cinema room and a bathroom.
On the first floor now we have 6 bedrooms, office of the owner and two bathrooms.
Thermal and cooling loads
Thermal load of the building has been calculated at 45kw with an external ambient
temperature of
-5ο C using the
radiant system.
The cooling load
has been
calculated at
65kw with an
external ambient
temperature at
42ο C.
We choose a
geothermal heat

2. pump 45kw thermal and cooling load with a recovery system producing domestic
hot water at 60ο C. The rest of the cooling load has been designed to be covered with
direct expansion fan coils. So the maximum efficiency we can get from radiant
cooling is 50w/m2 ,the rest 15 kw are covered from the fan coils and three water
cooled VRV systems by Daikin ,only if the outside temperature exceed 40οC.
If the system was designed with chiller and fan coils or vrv system the thermal and
cooling loads would be 45% more.
Benefits of using geothermal
The extremely interesting thing regards the efficiency and economy of the system
due to the constant temperature of the earth regardless of climate change.
Practically, we can look back through the comparison with a simple air conditioner.
During a hot day of summer (40-45 ° C), we all know the decline in performance of
the air conditioner and the inability to adequately cool the space.
This is because the device is required to expel heat into an environment already
saturated by thermal load, and make futile effort consuming excessive amounts of
electricity. If the air conditioner expelled heat to a cooler environment such as soil,
and the temperature remain constant independently of external climatic changes,
their odds would be too great and the economy in electricity enormous.
In this principle of thermodynamics is based the use of geothermal heat exchangers
that take advantage of stable soil temperature with the minimum power
consumption
The concept of combined geothermal energy and Thermal Active Building Systems
(TABS),
Known as GEOTABS, has been developed the last years and has known great success.
The energy saving potential is substantial, starting from 20% and going up to 70%.
For a system like this though, to reach its maximum potential of energy savings,
professional design, control and installation, combined with a product of highest
quality, must be combined from feasibility stage to final building-in-operation stage.
The latter means that experienced and professional partners are considered crucial
for system optimization.
Another and last great advantage that ground energy heat pumps can give you is the
long life of the equipment. No need of service because the unit is in a closed and
protected space area.
Not affected by moisture, sand and external conditions.

3. Machinery room & geothermal collector
The photo shows you the complete installation.
We have one
geo heat pump
producing hotcold water and
domestic hot
water. One geo
heat pump
producing only
hot water to
heat the
swimming pool
and another
heat pump
producing only
cold water for
the wine room.
Geothermal
collector is
outside in the
garden.

4. Comparison cost-energy saving
BUILDING
Air Conditioning surface
Relative & required cooling Power
Energy Consumption /Year
750
100
75.000
m2 in
total
w/m2
kW
Air cooled system
Geothermal Heat Pump
COP
3
COP
5,0
Power Consumption
25.000
kWh
9.091
kWh
eur
Power Consumption
El. Power Price /
KWh
El. Power Price / KWh ( with Fixed Ch and taxes
0,15
0,15
eur
El. Power Cost /year
3.750
eur
El. Power Cost /year
1.363,64
eur
Total Cost per year
3.750
eur
Total Cost per year
1.363,64
eur
2.386
63,64
eur
%
Saving for Cooling with the use of Geothermal pump per year
Conversion of Savings in USD Per Annum
BUDGETARY
Total
Exchange 1.36
750 sqmtr
Qty
Unit Euro
Euro
USD as on 18.10.13
60 KW GHX Pump
1
9500
9000
12240
750 sqm Radiant Cooling
750
50
37500
51000
12 fan coils
12
635
7620
10363,2
Controls machinery room
1
15000
15000
20400
Geo Exchanger
10
300
3000
4080
Drilling ( in feet)
800
20,00
16000
21760
88120
119843,2
750 sqmtr
Qty
Unit Euro
Euro
USD as on 18.10.13
100 KW GHX Pump
1
15000
15000
20400
12 fan coils
24
635
15240
20726,4
Controls machinery room
1
15000
15000
20400
Geo Exchanger
10
300
3000
4080
Drilling ( in feet)
800
20,00
16000
21760
64240
87366,4
WB Chiller
VRV
39
67000
60000
figures in USD
Savings P.A.
Radiant Cooling + Geo
29475
Geo ( 45% less efficient than RC)
22673
WB Chiller
0
VRV
0
Incremental Cost for RC + Geo @ fixed En
Cost
Pay back in Years
CAPEX
USD
119843,2
87366,4
67000
60000
52843,2
1,79

5. www.be.net/filippidisioannis
https://www.facebook.com/pages/ALBAdrill/100785403349473?fref=ts
www.cambicci.gr
http://www.youtube.com/user/energialtd?feature=mhee

6. The M.E.P. (mechanical, electrical and plumbing) studies office with the
title Cambicci+Associates was founded in February 2007 by
Gerasimos Kampitsis (Yerasimo Cambicci), Mechanical Engineer of the
Aristotle University of Thessaloniki, following his work experience
in electromechanical design and supervision since February 1992.
Furthermore the office was manned with electrical and mechanical
engineers
Aiming at the technologically sufficient and on time preparation of m.e.p.
studies and supervisions.
A consulting and engineering services company was legally constituted in
2012.
The scope of our office in its current form is:
• The elaboration of m.e.p. installations studies, for all types of projects
(buildings, urban design and infrastructure).
• Renewable energy systems design
• Nearly zero energy buildings design
• Energy feasibility inspections and evaluation of buildings
• Obtaining permits and licenses for buildings and installations
• Lighting Studies
• Supervision for all of the above subjects.
• Consulting Services as a Project Manager