Cyprus Energy
Agency
Supported by the European Commission through the ‘’Intelligent Energy- Program” and the Cyprus Union of Communities
1. Introduction
2. Analysis of the standard designed building
3. Importance of the orientation
4. Importance of the sunshades
5. Importance of the location
6. Integration of RES
7. Definition of Nearly zero energy building
8. Conclusions
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1
• EU in order to achieve the target of 20% energy saving and reduction of the greenhouse gas emissions until 2020 pays attention to the energy saving on buildings
• The promotion of the construction of
“nearly zero energy buildings” is an important parameter towards the achievement of this target.
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1
• A standard building is used for this presentation, taking into account:
– The thermal insulation
– The orientation
– Sunshades
– The use of RES
– The use of efficient electric appliances
– Climatic data of Cyprus
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2
Residence
Floors
Location
Climate data
Latitude
250 m 2
2
Nicosia
Athalassa
162 m
Thermal insulated bricks - 30 cm
Thermal insulated braces - 5 cm extruded polystyrene
Thermal insulated roof - 5 cm extruded polystyrene
Double glazing
Floor without thermal insulation
U mean
0,57 W/m 2 .k
0,542 W/m 2 .k
0,507 W/m 2 .k
2,5 W/m 2 .k
1,819 W/m 2 .k
1 W/m 2 .k
5
2
Cooling loads
56 W/m 2
Thermal losses
89 W/ m 2
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3
Comparison of cooling loads for a building in different orientations
Cooling loads
25
20
15
10
5
0
REFERENCE
BUILDING (Athalassa)
TEST BUILDING 1 (90
μοίρες περιστροφή )
TEST BUILDING 2
(180 μοίρες
περιστροφή )
TEST BUILDING 3
(270 μοίρες
περιστροφή )
Cooling load reduction because of orientation
11%
Peak Cooling load reduction because of orientation
19%
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4
Cooling loads
18
16
14
12
10
8
6
4
2
0
Comparison of cooling loads for building with and without sunshades (ext. blinds)
REFERENCE
BUILDING
(Athalassa)
REFERENCE
BUILDING Β με
εξ . Σκίαση
(Athalassa)
At August, in the hottest day
Cooling load reduction because of the sunshades
23%
Peak Cooling load reduction
αιχμής because of the sunshades
18%
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5
Cooling loads
18
16
14
12
10
8
6
4
2
0
Comparison of cooling loads for building in a different location
REFERENCE
BUILDING (Athalassa)
TEST BUILDING 4
(Prodromos)
TEST BUILDING 5
(Lemesos)
At August, in the hottest day
Load differentiation because of the location
21%
Peak load differentiation because of the location
21%
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5
Thermal losses
30000
25000
20000
15000
10000
5000
0
Comparison of thermal losses of building in a different location
REFERENCE
BUILDING (Athalassa)
TEST BUILDING 4
(Prodromos)
TEST BUILDING 5
(Lemesos)
Thermal losses differentiation because of the location 31%
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6
RES contribution in “low energy consumption” building
• Technologies
– Solar thermal technologies for heating/cooling
– Geothermal heat pumps for heating/cooling
– Energy fireplaces for heating
– Photovoltaic technology for electricity production
– Small wind turbines for electricity production
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In a conventional way
HEATING/COOLING
Heating energy
Cooling energy
29000 kWh/year
10000 kWh/year
39000 kWh/year
ELECTRICITY
Lighting
Electric appliances
2000 kWh/year
5500 kWh/year
7500 kWh/year
ENERGY CONSUMPTION
CO
2
EMISSIONS
46500 kWh/year
186 kWh/m2
42315 Kg/year
170 kg/m2.year
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7
Definition of a Nearly zero energy building
HEAT PUMP +
EL. Appliances ‘ Α ’
FINAL ENERGY
CONSUMPTION
10200 kWh/year
41 kWh/m2
HEATING/ COOLING
Heating energy
Cooling energy
8700 kWh/year
6000 kWh/year
14700 kWh/year
CO2 EMISSIONS
9280 Kg/year
37 kg/m2
ELECTRICITY
Lighting
Electric appliances
500 kWh/year
4000 kWh/year
4500 kWh/year
ENERGY
CONSUMPTION
Production of RES electricity
6 KW Photovoltaic system or
4 kW small wind turbine(wind 6.5m/s)
19200 kWh/year
77 kWh/m2
-9000 kWh/year
-9000 kWh/year
Additional cost
Photovoltaic system
Small wind turbine
Extra cost for high efficient electric appliances (e.g.
Α )
Geo Heat pump
External sunshades
TOTAL COST
26200 €
14000 €
1000 €
29000 €
4000 €
59300 € ή
47100 €
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HEAT PUMP +
EL. Appliances ‘ Α ’
FINAL ENERGY
CONSUMPTION
13100 kWh/year
52 kWh/m2
HEATING/ COOLING
Heating energy
Cooling energy
11600 kWh/year
6000 kWh/year
17600 kWh/year
CO2 EMISSIONS
11920 Kg/year
47 kg/m2
ELECTRICITY
Lighting
Electric appliances
500 kWh/year
4000 kWh/year
4500 kWh/year
ENERGY
CONSUMPTION
Production of RES electricity
6 KW Photovoltaic system or
4 kW small wind turbine(wind 6.5m/s)
22100 kWh/year
88 kWh/m2
-9000 kWh/year
-9000 kWh/year
Additional cost
Photovoltaic system or
Small wind turbine
Extra cost for high efficient electric appliances (e.g.
Α )
External sunshades
Total cost
26200 €
14000 €
1000 €
4000 €
62300 € or
50100 €
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3.
4.
5.
6.
1.
2.
A building with the thermal insulation consume 50% less heating and cooling energy (comparing with a not insulated building) .
For the improvement of the thermal insulation of the building a further reduction of the energy needs can be achieved, but with an additional cost.
The correct orientation of the building and the openings can reduce 10-20% the heating/cooling requirements .
The use of sunshades can reduce up to 21% the heating/cooling requirements .
The use of electrical appliances and light bulbs with class ‘A’ can reduce up to 40% the heating/cooling requirements
The location plays a key role to the heating/cooling requirements (20-30%)
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8
6.
7.
8.
The use of geo heat pumps can reduce 60-70% the heating requirements and 30-40% the cooling requirements .
The use of small wind turbines and photovoltaics can cover a
40-50 % of the electricity which is consumed by the building
The use of energy efficient fireplaces can cover completely the heating requirements of the building.
«low energy consumption buildings»
40-50 kWh/m2
Additional cost
50.000-
60.000
€
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Cyprus Energy
Agency
• Answers!
• Questions!
• Contact information: Τ el. 22667716, Fax: 22667736, e-mail: info@.cea.org.cy
• Visit us: 20, Lefkonos Str. Markides court 13,
Office 403, 2064, Strovolos
• Visit our website: www.cea.org.cy
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