Energy efficient office buildings Skanska Commercial Development Nordic. 1 Jonas Gräslund

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1 Energy efficient office buildings Skanska Commercial Development Nordic 1

2 We are active in selected home markets Norway Finland Sweden United States United Kingdom Denmark Czech Republic Hungary Estonia Poland Slovakia Romania Venezuela Colombia Peru Chile Argentina Brazil Revenue by geographic areas Nordic countries 44% Other European countries 21% The Americas 35% 2

3 Commercial Property Development Initiates, develops, leases and divests commercial property projects Focus on office buildings, shopping centers and logistics properties Presence in Sweden, Finland, Norway, Denmark, Poland, Czech Republic, Hungary, Romania and USA 270 employees Green Towers, Wrocław, Poland 3

4 Skanska CDN Markets Skanska Fastigheter Stockholm Skanska Fastigheter Göteborg Skanska Öresund, Malmö Skanska Öresund, Copenhagen Skanska Commercial Dev. Helsinki Skanska Commercial Dev. Norway New! Stavanger Oslo Helsinki Stockholm Gothenburg 4 Copenhagen Malmö

5 Track record Skanska CDN 117 projects 1,3 million sqm 5

6 Helicopterview on energy consumption 6

7 Frame Program based on strategy regarding mechanical installations Low environmental impact Low life cycle cost Flexibility Non complex solutions 7

8 VAV (variable air volume) Many motors, sensors, AHUs, COMPLICATED 8

9 CAV (constant air volume) + chilled beams, SIMPLE 9

10 Outdoor air Supply Air Handling Unit Supply air +5 o +20 o Traditional 2,3 m/s 40 kwh/m 2 Exhaust air +22 o Exhaust Air Handling Unit 10

11 Supply Air Handling Unit Slow air 1,6 m/s and no sound attenuators 22 kwh/m 2 Exhaust Air Handling Unit 11

12 Supply Air Handling Unit Slow air Low speed 1,0 m/s and double heat exchangers 11 kwh/m 2 Exhaust Air Handling Unit 12

13 Air Handling Units, from 2,3 m/s to 1,0 m/s HagaPorten I Trad alt Choosen alt 2,3 m/s 40 kwh/m 2 32 kwh/m 2 operation investment (+60 ) TOTAL 5.3 milj SEK 4.5 milj SEK Sundbypark Trad alt Choosen alt 1,6 m/s 28 kwh/m 2 22 kwh/m 2 operation investment (+200 ) TOTAL 2.6 milj SEK 2.4 milj SEK Lustgården 14, prel Trad alt Choosen alt 1,0 m/s 20 kwh/m 2 11 kwh/m 2 operation investment (+850 ) TOTAL 3.0 milj SEK 2.8 milj SEK 13

14 Free cooling preheats supply air 14

15 Outdoor air Skanska Self regulating cooling beams, Supply Air Handling Unit Chilled Beam +5 o +16 o C +22 o C KB2 +16/+19 o C 0% Free cooling coil increase the outdoor air temp With approx 3 o C (from +5 o to ca +8 o C), with 2 pipe coil KB2-SV21 is closed all winter Temperature in KB2 system is controlled by by variable speed of circulation pump in glycol circuit, in sequence with control valve for KB2. KB1 +8/+18 o C 15

16 Ventilation in two steps Office Supply Exhaust 16 Garage

17 Traditional Chiller Building Chilled water system 6 o 12 o C Chiller COP = approx 3 (cooling) 17

18 Traditional Ground Source heating and cooling system Building Chilled water system 10 o 15 o C Heat pump COP = approx 4-5 (heat + cool) Ground storage Ground temperature approx 5 o C 18

19 Skanska Deep Green Cooling Building Chilled water system 17 o 23 o C Circulation pump COP = (cooling) Ground storage Ground temperature approx 12 o C 19

20 Deep Green cooling Patent in Sweden, Pat pended in EU and US Summertime the building is cooled by the ground. Wintertime the building is partly heated by the ground, as the air for ventilation cools down the ground. The ground will be heated during summer and cooled to its original temperature during winter. Robust solution, no chiller or heat pump needed. The selv-regulated cooling beam system is operating In room temperature level. Ground bore hole storage operates in normal ground temperature. 20

21 Sequence control of cooling - heating Control unit Temperature sensor Motor valve Chilled beam radiator Chilled water Power 24 V 21

22 Self regulating cooling Cooling beam radiator Chilled water 22

23 Self regulation chilled beams P = k x A x dt P = cooling power A = heat transfer area dt = temp difference room and chilled water T room = 25 o C, T CW = 14/18 o C P = k x A x 9 o C T room = 25 o C, T CW = 20/24 o C P = k x 3A x 3 o C 23

24 24 2

25 25

26 Bild från Lars-Ove Matsson, Sweco 26

27 Entré Lindhagen, Stockholm. Mounting of U-tubes in bore hole Bild Jonas Gräslund 27

28 Entré Lindhagen. Collector for pipes from bore holes Bild Jonas Gräslund 28

29 Entré Lindhagen. Collector Bild Jonas Gräslund 29

30 Entré Lindhagen. Site with bore holes Picture Jonas Gräslund 30

31 Stockholm, Lustgården 14 Lettable area: m2 Parking in garage flexible ventilation chilled beams coil heat recovery free cooling AHU 1,0 m/s and double heat exch self regulation chilled beams Passive house windows U = 0,9 Deep Green Cooling Estimated energy consumption 49 kwh/m2 31

32 Temperature out from ground during 5 years 32

33 Annual mean outdoor temperature in some cities Helsingfors +5,0 o C Stockholm +6,6 o C Göteborg +7,9 o C München +7,9 o C Malmö +8,0 o C Warzawa +8,2 o C Köpenhamn +8,5 o C Chicago +9,7 o C Paris +10,6 o C 33

34 Steps to Deep Green energy for CDN Solution Heating Cooling* Power** Energy saving kwh/m 2 A Temp kwh/m 2 A Temp kwh/m 2 A Temp kwh/m 2 A Temp CDN Standard office Low Speed AHU Better windows Deep Green Cooling: Solar Heating Seasonal Storage: Wind power: Total Final energy consumption if all Green solutions are choosen is 0 kwh/m 2 (88 88) *) Including process cooling **) Excluding tenant power 34

35 Solar heating farm for district heating - Kungälv 35

36 Typical district heating in Sweden, possible solar heating El Olja Förädlad bio Naturgas Värmepump Kol Torv Oförädlad bio Hetvatten Spillvärme Avfall - JANUARI FEBRUARI MARS APRIL MAJ JUNI JULI AUGUSTI SEPTEMBER OKTOBER NOVEMBER DECEMBER 36

37 Seasonal storage 37

38 Energy efficient office buildings nzeb has to take into concideration: -Robust solutions -Load matching -Grid interaction -Real addition 38

39 We are determined to become the leading green project developer and constructor in our home markets Johan Karlström, CEO Skanska 39

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