zemdszemeds: case studies study itc einstein.pdf · case study: itceinsteinhighschoolitc einstein...

ZEM dSZEMedS: Case studies

dCase study:ITC EINSTEIN High School AnconaITC EINSTEIN High School, Ancona, Italy

The sole responsibility for the content of this publication lies with the authors. It does not necessarily reflect the opinion of the European Union. Neither the EASME nor the European Commission are responsible for any use that may be made of the information contained therein.

August 2015

General data3

ITC EINSTEIN High School, Municipality of Loreto, Italy

Name of the School

ITC EINSTEIN Hi h S h l

Type of school

ITC EINSTEIN High School

Hi h S h lHigh School

Number of students Owner

public436

Location

Municipality of Loreto, Italy

Year of construction

19661966

4

General dataITC EINSTEIN Hi h S h l M i i li f L I l

Building typology Heated area (m2 )


4 floors building 2998 m2

Site

Urban Plain

Heating degree days (base 18): 1897

Cooling degree days (base 26) 82Cooling degree days (base 26): 82

5

Current Situation

Renovation needs Building use


High Priority: energy efficiency and building facade safetySchedule for High school:

Standard Use: From 9th of September till 14th of June

High Priority: energy efficiency and building facade safety.

Reduce Use: From 15th of June till 12th of August

From 19th of August till 6th of September

2nd, 3rd, 4th of January

12th, 16th of April

23rd, 24th, 27th, 30th , 31st of December

Standard Use: Monday till Thursday: 08:00 to 14:00 and Friday: 08:00 to 18:00

Reduce Use: Monday till Friday: 07:00 to 08:00Reduce Use: Monday till Friday: 07:00 to 08:00

Wednesday: 14:00 to 18:00

Friday: 14:00 to 15:00

6

Current SituationITC EINSTEIN Hi h S h l M i i li f L I l

Building envelope: WallsBrickwall with wall cavity


U = 1 W/m².K

Building envelope: RoofRoof with insulation and waterproofing

U = 0.4 W/m².KU 0.4 W/m .K

Building envelope: GroundfloorGround floor consists of concrete

U = 0.9 W/m².K

Building envelope: WindowsSingle‐glazed windows with wooden frames

U 6 W/ ² KUw = 6 W/m².K

7

Current Situation

Airtightness: No measurements

H ti /C li 2 t l b il (347 kW) A d t f d b t d b il ( 31) l d th


Heating/Cooling: 2 natural gas boilers (347 kW). A secondary system, fed by a separated boiler (cargomax 31) placed on theterrace roof (first level) provide heating to the gymnasium, through two wall mounted air heaters. All theother spaces of the school are heated through radiators, fed by the two boilers placed in the thermal central.At the ground floor, the distribution is not embedded in the walls/floors as in the other floors, but pipes arehung to the ceiling, in the corridors and in the classrooms, often not insulated.g g, ,

Ventilation: No mechanical VentilationVentilation by opening windows

8

Current Situation

Lighting: Mainly, fluorescent tubes controlled by users


Appliances: Lab: PC, Projector, PrinterOffice: PC, Printer, Copy MachineGym: PC, Refrigerator, Dryer

DHW: DHW is present just in the Gym, managed through the CARGOMAX 31 boiler

Cooking: No cooking

9

Current Situation

Current final energy consumptionkWh/m2 conditioned area (from electricity


bills, metering etc.):y

kWh/m2 y; 12

natural gas

kWh/m2 y; 193

Total of energy consumption (bills 2010‐2013): 614,949 kWh/year, 205 kWh/year m2 conditionedarea

Running cost:electricit

natural

y €/y ; 8148

gas €/y ; 65202

Energy (bills 2010‐2013): 65,202 €/year (natural gas), 8,148 €/year (electricity). VAT included.Water: no dataMaintenance: no data

10NZEB RenovationITC EINSTEIN High School, Municipality of Loreto, Italy

Design approach: Deep renovation towards ZEMedS nZEB Schools requeriments.

ZEMedS Goals: Requeriment 1: C Prod ≤ 0ZEMedS Goals: ‐ Requeriment 1: CPE‐ProdRES≤ 0

Primary energy consumption yearly (heating, cooling, ventillation, DHW and lighting) is produced by local renewable energies.

‐ Requeriment 2: C ≤ 25 kWh/m2 yRequeriment 2: CFE≤ 25 kWh/m2 y

FE consumption yearly (heating, cooling, ventillation and lighting) per conditioned area

‐ Requeriment 3: Indoor air quality guaranteed (CO2≤1000 ppm) and temperature above 28ºC ≤40 hoursyearly during occupancyyearly during occupancy

National factors for conversion in energy and CO2 have been taken into account (data 2014).

Methodology in energy simulations: Steps considered:

First step: 3 proposals (variant A, B and C) in envelope renovation: from less insulated to more insulated

Second step: 2 proposals for each variant:Renovation in lighting systemg g yRenovation in lighting system, heating and DHW system + installation of PV system+use of natural ventilationRenovation in lighting system, heating and DHW system + installation of PV system+use of mechanical ventilation without heat recovery l h h d ll f fRenovation in lighting system, heating and DHW system + installation of PV system+use of mechanical ventilation with heat recovery

11NZEB RenovationITC EINSTEIN High School, Municipality of Loreto, Italy

First step: 3 proposals (variant A, B and C) in envelope renovation: from less insulated to more insulated.

V i A V i V i CVariant A Variant B Variant C

Replacement of existing single glazing for:Variant A: low‐e double glazing, 16mm(air) and wooden frame (with thermal break) Ug=1 6 Uf= 2 2Uwindows and exterior doors 1.8 1.5 1.4 thermal break) . Ug=1.6 Uf= 2.2Variant B: low‐e double glazing, 16mm(argon) and wooden frame (with thermal break) . Ug=1.3 Uf= 2.2Variant C: low‐e double glazing, 16mm(argon) and wooden frame . Ug=1.3 Uf= 2.2

Step 1

Ug 1.3 Uf 2.2Solar protection Interior Curtains ‐

Uroof 0.3 0.22 0.15

Variant A: 3cm roof tiles with cool material coating and 4cm EPS attached Variant B: 3cm roof tiles with cool material coating and 7cm EPS attached Variant C 3cm roof tiles with cool material coating and 14cm EPS attached

Uwall 0.4 0.3 0.2

Variant A: External wall insulation 5cm EPS & plaster with cool coating Variant B: External wall insulation 8cm EPS & plaster with cool coating Variant C: External wall insulation 13cm EPS & plaster with cool coating

Ugroundfloor current ‐

12

NZEB RenovationITC EINSTEIN High School, Municipality of Loreto, Italy

Second step: 3 proposals for each variant A, B and C:Step 2.1: Renovation of heating and DHW system + installation of PV system + use of natural ventilationStep 2.2: Renovation of heating and DHW system + installation of PV system + use of mechanicalventilation without heat recoveryStep 2 3: Renovation of heating and DHW system + installation of PV system + use of mechanicalStep 2.3: Renovation of heating and DHW system + installation of PV system + use of mechanicalventilation with heat recovery

N t l V til ti Wi d i ( 0 008 3/ / )

Step 2.1

Natural Ventilation Windows open sceanrio ( 0,008 m3/sec/person)

Heating system Condensing boilers

Cooling system no cooling system

PV system 448m2 PV panels

Step 2.2

Mechanical Ventilation Ventilation systems without heat recovery (control when occupancy) 6.5 l/s person

Heating system Condensing boilers

Cooling system no cooling system


Step 2.3

Mechanical Ventilation Ventilation systems without heat recovery (control when occupancy) 6.5 l/s person, 70% heat recovery

Heating system Condensing boilersl lCooling system no cooling system


13


Italian Regulation:

14

NZEB Renovation

FINAL ENERGY:


134 129

105 100100120140160

2

ZEMedS requirements (heating, cooling, vent. & lighting)

National Regulation

VARIANT A 25 205 5

66 62

5 5

75 70

50

20406080

100

kWh/m2 National Regulation

step 1 & step 2.1

step 1 & step 2.2

step 1 & step 2.1 : 66 kWh/m² in final energy



Total ZEMedS Heating, cooling & ventilation

Lighting step 1 & step 2.3

Cooling; 0

Ventilation; 0

Lighting; 5e e gy

Cooling; 0

Ventilation; 0

Lighting; 5

final energy

Cooling; 0

Ventilation; 0

Lighting; 5

energy

193250 Primary energy of existing building kWhpe/m².y (h i li h i li ) d f bill

Heating; 62

Heating; 100

Heating; 70

PRIMARYENERGY:

86 79118

88‐79

‐119 ‐87‐38 ‐57 ‐42

‐500

50100150200

ng p 1 ep

ep

ep

(heating, lighting, DHW, appliances) data from bills

Primary energy for non renewable energy consumption kWhpe/m².y (heating, ventilation, lighting and DHW) (data from simulation)

‐150‐10050

Existing bu

ildi

ste p

step

1 &

ste

2.1

step

1 &

ste

2.2

step

1 &

ste

2.3 Primary Energy predicted by RES kWh/m2 y covering

heating, vent. , lighting, DHW (data from simulation)

15


FINAL ENERGY: 134 129

104 100120140160


VARIANT B 25 205 5

65 60

5 5

74 69

50

20406080

100


step 1 & step 2.1

step 1 & step 2.20






Ventilation; 0

Lighting; 5

energy

Cooling; 0

Ventilation; 0

Lighting; 5

final energy

Cooling; 0

Ventilation; 0

Lighting; 5

energy

193250 Primary energy of existing building kWhpe/m².y

Heating; 60Cooling; 0

Heating; 99

Heating; 69

PRIMARYENERGY:

193

84 78117

87

‐77 ‐117 ‐87‐37 ‐56 ‐42

‐500

50100150200

ng p 1 ep

ep

ep

y gy g g p y(heating, lighting, DHW, appliances) data from bills


‐150‐10050

Existing bu

ildin

step

step

1 &

ste

2.1

step

1 &

ste

2.2

step

1 &

ste

2.3 Primary Energy predicted by RES kWh/m2 y covering

heating, vent. , lighting, DHW (data from simulation)

16


FINAL ENERGY: 134 129

104 99120140160


VARIANT C 25 205 5

64 59

5

99

5

73 68

50

20406080

100


step 1 & step 2.1

step 1 & step 2.20



step 1 & step 2.3 : 73 kWh/m² in final step 1 & step 2.2 : 104 kWh/m² in fi l

step 1 & step 2.1 : 64 kWh/m² in final

Cooling; 0

Ventilation; 0

Lighting; 5

energy

Cooling; 0

Ventilation; 0

Lighting; 5final energy

Ventilation; 0

Lighting; 5

energy

193250 Primary energy of existing building kWhpe/m² y

Heating; 68

Heating; 99

Heating; 59

Cooling; 0

PRIMARYENERGY:

193

81 76117

86

‐77‐117 ‐85

‐37 ‐56 ‐410

50100150200250

g 1 p p p Primary energy of existing building kWhpe/m².y (heating, lighting, DHW, appliances) data from bills


‐150‐100‐50

Existing bu

ilding

step

1

step

1 &

step

2.1

step

1 &

ste p

2.2

step

1 &

ste p

2.3

lighting and DHW) (data from simulation)

Primary Energy predicted by RES kWh/m2 y covering heating, vent. , lighting, DHW (data from simulation)

17

NZEB Renovation

Global cost and paybacks for the renovation scenarios:


p y

Calculations based on:• Average yearly increase in gas price*: 3.9 % (data from 2003 to 2014)• Average yearly increase in electricity price**: 2.5 % (data from 2003 to 2014)

• Overall cost of gas: 65,202 €/year (VAT included)• Overall cost of electricity: 8,148 €/year (VAT included)• Considered an overall maintenance cost of the renovation scenarios (yearly percentage of the total cost of the renewals) in 0.5% (envelope measures), 2% (heating systems and PV)• Replacement assumed in lighting (15‐20 years lifetime)

• Average inflation considered in 1.8% (from 10 years average data)

Overall maintenance yearly percentage of total cost of investment.All construction costs (prices at 2014) in renovation scenarios include assembling, disassembling and daily amortization of scaffold are included.Sources for cost data are gathered from using of existing cost database which have been derived from market‐based data gathering, evaluating of recent projects, and analyzing of standard offers of construction companies.

*Source: http://ec.europa.eu/eurostat/tgm/table.do?tab=table&init=1&language=en&pcode=ten00117&plugin=1** Source: http://ec.europa.eu/eurostat/tgm/table.do?tab=table&init=1&plugin=1&language=en&pcode=ten00118

18

NZEB Renovation

Paybacks for the renovation implemented in steps (every 4 years):


Expectedsavings in

gas

Expectedsavings in electrcicity

Overall cost of gas €/year

Overall cost of

electricity €/year

Investmentin €

Overallmaintenan

cecost €/year

Cost of replacemen

t in € Items to be replacedPayback(years)

step 1 ‐ var A (windows & ext. doors & walls & roofs) 54% 0% 29.706 € 8.148 € 876.478 € 930 € 0 € ‐ 17step 1 ‐ var B (windows & ext. doors & walls & roofs) 56% 0% 28.844 € 8.148 € 918.278 € 930 € 0 € ‐ 17step 1 ‐ var C (windows & ext. doors & walls & roofs) 57% 0% 27.778 € 8.148 € 994.065 € 930 € 0 € ‐ 19step 2.1 ‐ boiler + nat. vent. + PV system (var A) 9% 33% 26.359 € 5.445 € 163.388 € 1.614 € 57.367 € gas boiler (15 years)/inversors

PV (15 years lifetime) 39

t 2 1 b il t t PV b il (15 )/istep 2.1 ‐ boiler + nat. vent. + PV system (var B) 8% 33% 26.445 € 5.445 € 160.388 € 1.614 € 56.999 € gas boiler (15 years)/inversors


step 2.1 ‐ boiler + nat. vent. + PV system (var C) 6% 33% 26.997 € 5.445 € 160.388 € 1.614 € 56.999 € gas boiler (15 years)/inversors


step 2.2 ‐ boiler + mechanical vent. + PV system (var A) ‐43% 33% 41.211 € 5.445 € 352.903 € 3.509 € 64.911 € gas boiler (15 years)/inversors

PV (15 years lifetime) >50

step 2 2 boiler + mechanical vent + gas boiler (15 years)/inversorsstep 2.2 ‐ boiler + mechanical vent. + PV system (var B) ‐46% 33% 42.105 € 5.445 € 349.903 € 3.509 € 64.543 € gas boiler (15 years)/inversors


step 2.2 ‐ boiler + mechanical vent. + PV system (var C) ‐51% 33% 43.504 € 5.445 € 349.903 € 3.509 € 64.543 € gas boiler (15 years)/inversors


step 2.3 ‐ boiler + MVHR + PV system(var A) ‐3% 33% 29.732 € 5.445 € 341.478 € 2.724 € 59.023 € gas boiler (15 years)/inversors


step 2 3 boiler + MVHR + PV system gas boiler (15 years)/inversors

T t l b k i ll i t i 50 t f i t ith t l til ti

step 2.3 ‐ boiler + MVHR + PV system(var B) ‐4% 33% 29.995 € 5.445 € 341.478 € 2.724 € 59.023 € gas boiler (15 years)/inversors


step 2.3 ‐ boiler + MVHR + PV system(var C) ‐7% 33% 30.821 € 5.445 € 338.478 € 2.724 € 58.655 € gas boiler (15 years)/inversors


Total payback in all variants is > 50 years, except for variants with natural ventilation.

Overall maintenance yearly percentage of the total cost of the investment.All construction costs (prices at 2014) in the renovation scenarios include assembling, disassembling and daily amortization of scaffold are included in wall insulation costs. VAT included.

19

NZEB Renovation

Paybacks for the renovation implemented in steps (every 4 years):Values in m2 conditioned area


Expectedsavings in

gas


Overall cost of gas

€/year m2

Overall cost of

electricity €/year m2

Investmentin €/m2

Overall maintenanc

ecost €/year

m2

Cost of replacement in €/m2 Items to be replaced

Payback(years)

t 1 A ( i d & t dstep 1 ‐ var A (windows & ext. doors & walls & roofs) 54% 0% 10 € 3 € 292 € 0 € 0 € ‐ 17step 1 ‐ var B (windows & ext. doors & walls & roofs) 56% 0% 10 € 3 € 306 € 0 € 0 € ‐ 17step 1 ‐ var C (windows & ext. doors & walls & roofs) 57% 0% 9 € 3 € 332 € 0 € 0 € ‐ 19step 2 1 boiler + nat vent + PV gas boiler (15 years)/inversors PVstep 2.1 ‐ boiler + nat. vent. + PV system (var A) 9% 33% 9 € 2 € 54 € 1 € 19 € gas boiler (15 years)/inversors PV

(15 years lifetime) 39

step 2.1 ‐ boiler + nat. vent. + PV system (var B) 8% 33% 9 € 2 € 53 € 1 € 19 € gas boiler (15 years)/inversors PV


step 2.1 ‐ boiler + nat. vent. + PV system (var C) 6% 33% 9 € 2 € 53 € 1 € 19 € gas boiler (15 years)/inversors PV


step 2 2 boiler + mechanical vent gas boiler (15 years)/inversors PVstep 2.2 ‐ boiler + mechanical vent. + PV system (var A) ‐43% 33% 14 € 2 € 118 € 1 € 22 € gas boiler (15 years)/inversors PV

(15 years lifetime) >50

step 2.2 ‐ boiler + mechanical vent. + PV system (var B) ‐46% 33% 14 € 2 € 117 € 1 € 22 € gas boiler (15 years)/inversors PV


step 2.2 ‐ boiler + mechanical vent. + PV system (var C) ‐51% 33% 15 € 2 € 117 € 1 € 22 € gas boiler (15 years)/inversors PV


step 2 3 boiler + MVHR + PV gas boiler (15 years)/inversors PVstep 2.3 ‐ boiler + MVHR + PV system (var A) ‐3% 33% 10 € 2 € 114 € 1 € 20 € gas boiler (15 years)/inversors PV


step 2.3 ‐ boiler + MVHR + PV system (var B) ‐4% 33% 10 € 2 € 114 € 1 € 20 € gas boiler (15 years)/inversors PV


step 2.3 ‐ boiler + MVHR + PV system (var C) ‐7% 33% 10 € 2 € 113 € 1 € 20 € gas boiler (15 years)/inversors PV


Total payback in all variants is > 50 years, except for variants with natural ventilation.Overall maintenance yearly percentage of the total cost of the investment.All construction costs (prices at 2014) in the renovation scenarios include assembling, disassembling and daily amortization of scaffold are included in wall insulation costs. VAT included.

20

NZEB Renovation

In graphics, global cost of step 1:


g p g p

0510400

500

€/m²

Maintenance costs €/m2 year101520253035100

200

300

400

Confort

Globa

l costs en € Maintenance costs €/m2 year

Energy price (electricity) €/m2 year

Energy price (diesel) €/m2 year

Cost of replacement €/m235400

Existing building step 1 ‐ var A (windows & ext. doors & walls &

roofs)

step 1 ‐ var B (windows & ext. doors & walls &

roofs)

step 1 ‐ var C (windows & ext. doors & walls &

roofs)

G Investment €/m2

Confort (numbers of hours > 28ºC)

Number of hours of overheating over 28ºC for renovated buildings are expected to be zero.

21

NZEB Renovation

In graphics, global cost of step 2.1:


g p g p

0510150

200

€/m²


50

100

150

Comfort

Globa

l costs en € Maintenance costs €/m2 year




Existing building step 2.1 ‐ boiler + nat. vent. + PV system (var

A)

step 2.1 ‐ boiler + nat. vent. + PV system (var

B)

step 2.1 ‐ boiler + nat. vent. + PV system (var

C)

G Investment €/m2

Comfort (numbers of hours > 28ºC)


The replacement of the gas boilers have been considered in the cost of replacement of the existing building. There is no information of the costs in maintenance concerning the existing building.

22

NZEB Renovation



g p g p

051015200

250

300

tn €/m²


50

100

150

200

Comfort

Globa

l costs en




Investment €/m2400Existing building step 2.2 ‐ boiler +

mechanical vent. + PV system (var A)

step 2.2 ‐ boiler + mechanical vent. + PV

system (var B)

step 2.2 ‐ boiler + mechanical vent. + PV

system (var C)

Investment €/m2




23

NZEB Renovation



g p g p

0510

250

300

€/m²


50

100

150

200

Confort

Globa

l costs en €




I t t €/ 235400

50

Existing building step 2.3 ‐ boiler + MVHR + PV system (var A)

step 2.3 ‐ boiler + MVHR + PV system (var B)

step 2.3 ‐ boiler + MVHR + PV system (var C)

G Investment €/m2



The replacement of the gas boilers have been considered in the cost of replacement of the existing building. There is no information of the costs in maintenance concerning the existing buildingmaintenance concerning the existing building.

24

NZEB Renovation

Paybacks for the renovation implemented all at once (step 1 + steps 2):


Expectedsavings in

gas


Overall cost of gas €/year

Overall cost of electricity

€/yearInvestment

in €

Overallmaintenanc

ecost €/year

Cost of replacement

in € Items to be replacedPayback(years)

step 1+ step 2.1 (var A) 58% 33% 27.147 € 5.445 € 1.039.867 € 5.455 € 152.750 € gas boiler (15 years)/inversors PV (15 years lifetime) 22p p ( ) (15 years lifetime)

step 1+ step 2.1 (var B) 59% 33% 26.445 € 5.445 € 1.078.666 € 5.455 € 152.410 € gas boiler (15 years)/inversors PV (15 years lifetime) 22

step 1+ step 2.1 (var C) 60% 33% 25.999 € 5.445 € 1.154.453 € 5.455 € 152.410 € gas boiler (15 years)/inversors PV (15 years lifetime) 23

step 1+ step 2 2 (var A) 35% 33% 42 443 € 5 445 € 1 229 381 € 6 403 € 159 720 € gas boiler (15 years)/inversors PV 36step 1+ step 2.2 (var A) 35% 33% 42.443 € 5.445 € 1.229.381 € 6.403 € 159.720 € (15 years lifetime) 36



gas boiler (15 years)/inversors PVstep 1+ step 2.3 (var A) 53% 33% 30.621 € 5.445 € 1.217.957 € 6.350 € 154.280 € gas boiler (15 years)/inversors PV (15 years lifetime) 26



Total paybacks in variants with natural ventilation is expected in 22‐23 years. Total paybacks in variants with mechanical ventilation is expected in 36‐37 years. Total paybacks in variants with mechanical ventilation with heat recovery is expected in 26‐27 years.

Overall maintenance yearly percentage of the total cost of the investment.All construction costs (prices at 2014) in the renovation scenarios include assembling, disassembling and daily amortization of scaffold are included in wall insulation costs. VAT included.

25

NZEB Renovation

Paybacks for the renovation implemented all at once (step 1 + steps 2):Values in m2 conditioned area


Expectedsavings in

gas


Overall cost of gas €/m2

year

Overall cost of electricity €/m2 year

Investmentin €/m2

Overall maintenanc

ecost €/m2

year

Cost of replacement

in €/m2 Items to be replacedPayback(years)

step 1+ step 2.1 (var A) 58% 33% 9,1 € 1,8 € 347 € 2 € 51 € gas boiler (15 years)/inversors PV (15 years lifetime) 22

step 1+ step 2.1 (var B) 59% 33% 8,8 € 1,8 € 360 € 2 € 51 € gas boiler (15 years)/inversors PV (15 years lifetime) 22

step 1+ step 2.1 (var C) 60% 33% 8,7 € 1,8 € 385 € 2 € 51 € gas boiler (15 years)/inversors PV (15 years lifetime) 23(15 years lifetime)



step 1+ step 2.2 (var C) 36% 33% 14,0 € 1,8 € 448 € 2 € 53 € gas boiler (15 years)/inversors PV (15 lif ti ) 37p p ( ) , , (15 years lifetime)



step 1+ step 2 3 (var C) 54% 33% 9 9 € 1 8 € 444 € 2 € 51 € gas boiler (15 years)/inversors PV 27

Total paybacks in variants with natural ventilation is expected in 22‐23 years. Total paybacks in variants with mechanical ventilation is expected in 36‐37 years.

step 1+ step 2.3 (var C) 54% 33% 9,9 € 1,8 € 444 € 2 € 51 € g ( y )/(15 years lifetime) 27

Total paybacks in variants with mechanical ventilation with heat recovery is expected in 26‐27 years.Overall maintenance yearly percentage of the total cost of the investment.All construction costs (prices at 2014) in the renovation scenarios include assembling, disassembling and daily amortization of scaffold are included in wall insulation costs. VAT included.

26

NZEB Renovation

In graphics, global cost of renovation all at once for step 1+ step 2.1:


g p g p p

0

5800

1000

m² Maintenance costs €/m2 year10

15

20

25400

600

800

Confort

bal costs en €/m Maintenance costs €/m2 year




30

35

400

200

Existing building step 1+ step 2.1 (var A) step 1+ step 2.1 (var B) step 1+ step 2.1 (var C)

Glob

Investment €/m2




27

NZEB Renovation



g p g p p

0

5

10800

1000

/m² Maintenance costs €/m2 year

15

20

25

30200

400

600

Confort

loba

l costs en €/ Energy price (electricity) €/m2 year



Investment €/m235

400

200


Gl Investment €/m2




28

NZEB Renovation



g p g p p

0

5800

1000

m² Maintenance costs €/m2 year10

15

20

25400

600

800

Confort

bal costs en €/m Maintenance costs €/m2 year




30

35

400

200


Glob

Investment €/m2




29

NZEB Renovation

Current situation:


gas electricitygas electricityconsumption (kWh) Ratio (kWh/m2) consumption (kWh) Ratio (kWh/m2)

Real (bills) 578614 193 36335 12Simulation (Open studio+Energyplus) 495343 165 43755 15

Results of nZEB renovation under ZEMedS goals:

result 1 result 2 result 3

envelope + ventilation with envelope + ventilation with envelope + ventilation with

Renovation implemented with energy efficiency measures in

envelope + ventilation withnatural ventilation + heatingsystem (condensing boiler)+ PV system covering (heating,

lighting, ventilation)

envelope + ventilation with mechanical ventilation +

heating system (condensing boiler)+ PV system covering (heating, lighting, ventilation)

mechanical ventilation with heat recovery + heating system

(condensing boiler)+ PV system covering (heating, lighting,

ventilation)

Energy balance in PE (kWh/m2 y) (heating, cooling, vent., Var A 0 113924/38 0 170886/57 1 125916/42DHW & lighting) and RES production (kWh and kWh/m2 conditioned area)(ZEMedS requirement 1) (simulations)

Var B 1 110926/37 1 167888/56 ‐1 125916/42

Var C ‐1 110926/37 0 167888/56 0 122918/41

Energy result in FE (kWh/m2 y) (heating, cooling, vent. & lighting) per conditioned area (ZEMedS requirement 2)

Var A 66 105 75Var B 65 104 74

(simulations) Var C 64 104 73

Goal of (ZEMedS requirement 3)

‐ natural ventilation by opening windows (no indoor quality guaranteed)‐ predicted temperatures above 28ºC in less than 40

‐ indoor quality guaranteed by mechanical ventilation‐ predicted temperatures above 28ºC in less than 40 hours/year

‐ indoor quality guaranteed by mechanical ventilation‐ predicted temperatures above 28ºC in less than 40 hours/year

hours/year hours/year y

Paybacks (years) step by step implementation >50 (except for natural ventilation)Paybacks (years) all at once implementation 22‐23 36‐37 26‐27

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