Hermann Lebherz and Annelie Stumpp present: Double Green Building a German Passiv Haus case study together with electricity-generation solar panels

Size: px

Start display at page:

Download "Hermann Lebherz and Annelie Stumpp present: Double Green Building a German Passiv Haus case study together with electricity-generation solar panels"

Constance Carmella Holt
6 years ago
Views:

1 Hermann Lebherz and Annelie Stumpp present: Double Green Building a German Passiv Haus case study together with electricity-generation solar panels 1

2 Living in the City of Frankfurt Revitalisation of a former ministry office high rise block which got demolished transformed into a residential quarter of 189 Passiv Haus dwellings with additional request for an energy efficient KfW 40 standard 2

3 Frankfurt is a thriving international financial Centre Frankfurt Regensburg 3

4 Greater Frankfurt a financial district, an airline hub, the second and third wealthiest counties in Germany Adickesallee 4

5 Frankfurt has got a local government consisting of a coalition with a major part of the green party. The major who is responsible for environment, planning and sustainable policy of buildings is from the green party. To save commuting energy and pollution since 1 Mio staff commutes day by day into downtown Frankfurt green policy is implemented through the City`s Housing Association. The Housing Association of the City of Frankfurt - ABG Frankfurt Holding - have a stock of flats for rent. Frankfurt is world wide - with more than flats - forerunner in the energy conservation flats (Passiv Haus Standard). 5

6 What are the key figures for a Passiv Haus? Principle of a thermos flask Energy which is in the building should stay as long as possible in the building Energy consumption below 15 kwh / (sqm*a) Primary energy consumption below 120 kwh / (sqm*a) A Passiv Haus consumes only 15 Kilowatt energy per sqm and year An old standard constructed flat consumes 16 times the energy amount of a Passiv Haus flat. 6

7 What means: energy efficient house KFW 40 or 55 The German Government sponsors buildings which consume low energy by giving generous loans if the owner choses to design and build carbon energy saving buildings. A KFW 55 building can get achieved by the standard of a Passiv Haus, the only requirement is to apply for a loan before one starts on site. A KFW 40 building needs addition energy saving options, e. g. solar panels to produce less cabon by heating the building. A KFW 40 plus building need more than 200 sqm solar panels and a huge battery per flat, (and the other requirements) to qualify for this category. 7

To achieve an Passiv Haus following procedures have to be implemented: Registration of the project with the PHI Implementing of the calculation

8 To achieve an Passiv Haus following procedures have to be implemented: Registration of the project with the PHI Implementing of the calculation scheme during the design process, in order to get the right results Constant reviews of the design decisions and adaptions in the calculation scheme 8

9 U-value of construction components calculation towards the solution 9

10 The design of a Passiv Haus is basically a complicated excel sheet, with hundreds of pages, and several thousand calculations and a trial and error design till the 15 kwh/ (sqm*a) have been achieved Energy figures in comparison

11 Section through a part of building Detail of perimeter wall with 300 mm outside thermal insulation 300 mm insulation to the basement 11

Interrupted upgoing walls which did not work in terms of structures More insulation material had to be fixed Recuperation of the energy consumption of house

12 Interrupted upgoing walls which did not work in terms of structures More insulation material had to be fixed Recuperation of the energy consumption of house hold devices like stove, washing machines, people, lighting, bath room energy, etc. through mechanical ventilation and high efficient energy recuperation 12

Air-thight window fitting to facade Solar

13 Key features of a Passiv Haus Compact lay-out of the building Highly efficient insulation up to 300 mm in walls, U-value min 0,15 W/sqm K Small window openings Air-thight window fitting to facade Solar gain from south facing windows had to be calculated as well 13

14 Sample of window Triple glazing, U-Value of windows min. 0,8 W/sqm K Highly efficient window frames Air-thightness of construction of all construction parts There is no need to open windows for ventilation, since a mechanical ventilation avoid noise and pollen from outside Solar gain through south oriented windows 14

The Passiv Haus Institut is affiliated with the University Darmstadt, where researchers into Building technology developed a mathematical program to simulate the energy consumption of buildings.

15 The Passiv Haus Institut is affiliated with the University Darmstadt, where researchers into Building technology developed a mathematical program to simulate the energy consumption of buildings. All building materials and construction products are being compiled into an data base of the Passiv Haus Institute. For instance all window constructions are being calculated and tested for energy conservation and than certified. 15

16 Construction samples e. g. windows The construction has to be free of thermal-bridges free of air draft optimised high technology design and manufacture 16

Roof details Highly efficient insulation up to 600 700 mm in roofs More than 80 % of the used energy are being recuperated Low carbon policy for the

17 Roof details Highly efficient insulation up to mm in roofs More than 80 % of the used energy are being recuperated Low carbon policy for the running of the flats Primary energy consumption for the household (heating, warm water production, electricity) must be lower than 120 kwh/(sqm*a) 17

18 Air handling units certified from the Passiv Haus Institute 18

19 Floor plan of flats with air ventilation ducts in the concrete floor slab, red fresh air intake, blue used air extraction 19

20 Typical decisions to be taken to achieve the magical 15 kwh/(sqm*a) Triple glazing of windows Using Certified window frames and glass Air tight fitting of window frames to the structure and testing by blower door test 300 mm wall insulation mm roof insulation High efficient energy recuperating ventilation plants % High volume insulation for energy handling ducts and pipes (400 mm) warm water ducts for dish washer Induction stoves for the kitchen units The design process consumes approx % of the time of a standard building design 20

21 To make sure the inhabitants are behaving in the way of energyconscious persons. The Housing Association issues an booklet how to live in an Passiv Haus and the right way to save energy. 21

22 After all time consuming procedures the building will be awarded the certificate of the Passiv Haus Institute. An officially placed sign plaque is being fixed to the building. 22

Double Green Building In order to achieve an energy-efficient KFW 40 grade for the subsidy of 5.

23 Double Green Building In order to achieve an energy-efficient KFW 40 grade for the subsidy of per flat Solar panels for energy production have to be introduced Calculations of solar gain for all buildings for one year have to be designed 23

24 Calculation of electricity production per annum per house 24

25 PV Anlage Vorgabe (kwp) Stand Haus 1 Haus 2 Haus 3 Haus 4 Haus 5 1,8 6,3 15,0 10,2 10,8 ermittelte Module à 250W (St.) mögliche Module aufgrund eingeschränkter Dachflächen Stand Ca. Oberflächen bei einer Modulgröße von x mm ca. 1,80 m²) ~ 14,4 m²* ~ 46,8 m²* ~ 86,4 m²* ~ 21,6 m²* ~ 48 m²* maximal mögliche ELT Leistung in (kwp) 1,8 6,3 12,0 *) 3,0 *) 7,5 *) This table shows the calculation of how many solar panels are needed per house The size of the module areas Energy production of the solar panels 25

26 Typical roof plan Lay out of solar panel areas (green) Spaces of mechanical ventilation units (black boxes) and service walkways Space for ventilation ducts inside the thermal insulation (blue and red lines) Smoke outlets of the ducts Solar usable areas rather small 26

27 Cost break down Subsidies versus costs Costs for 189 flats approxy 1 Mio Subsidy ¼ Mio Problems: Through Passiv Haus flats of 8 storeys, the roof is heavily occupied with mechanical ventilation plants and ducts Innercity flats in medium high buildings are difficult to equip with solar panels 27

28 Introduction of a consultancy firm in project management of complicated projects e. g. Passiv Haus shopping centers concert halls or trouble shooting 28

29 Introduction of a consultancy firm in project management of complicated projects e. g. Passiv Haus shopping centers concert halls or trouble shooting 29

30 Thank you very much for your kind attention. If you need a trouble shooter for outstanding projects think of WLS 30

Dienstleistung. Certification as "Quality Approved Passive House" Criteria for Residential-Use Passive Houses

Dienstleistung. Certification as Quality Approved Passive House Criteria for Residential-Use Passive Houses Passiv Haus Institut Passivhaus Dienstleistung GmbH Dr. Wolfgang Feist Rheinstr. 44/46 Rheinstr. 44/46 D-64283 Darmstadt D-64283 Darmstadt www.passiv.de www.passivhaus-info.de Certification as "Quality