Contractor

Name : Sandwood Construction Ltd.

Contact : Richard Garland

 http://sandwood.co.uk/

Construction Manager

Name : Bere Architects

Contact : Justin Bere ([email protected])

 https://www.bere.co.uk/

Stakeholders

Function : Certification company

MEAD: ENERGY &ARCHITECTURAL DESIGN

Kym Mead ([email protected])

 http://www.meadconsulting.co.uk/


Passivhaus Plus Certification

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Function : Environmental consultancy

Energelio

[email protected]

 http://www.energelio.fr/


Environmental Engineers that carried out the self-consumption analysis

Type of market

Realization

If you had to do it again?

We are doing it again for another client, using low-cost construction on a level site at 1/3rd of the cost.

Building users opinion

Very happy that the house is gaining so much interest around the world as a pioneering example that might one day be the norm.

Energy consumption

• Primary energy need : 80,00 kWhpe/m².year
• Primary energy need for standard building : 200,00 kWhpe/m².year

Calculation method : Other

CEEB : 0.0001

Breakdown for energy consumption : Heating: 22%
DHW: 10%
MVHR: 9%
Power sockets: 25%
Cooking: 5%
Miscellaneous: 9%
Lighting: 19%

Envelope performance

• Envelope U-Value : 0,12 W.m^-2.K^-1
More information :

•Below ground walls: concrete basement retaining structure (250mm), exterior Foamed glass insulation (360mm). U-value= 0.118 W/(m2K)
•Above ground walls: Prefabricated timber frame, with mineral wool insulation (300mm), and larch rain screen cladding. U-value = 0.137 W/(m2K)
•Prefabricated Glulam box-beam ceiling, PIR insulation (280mm) and multi-ply hot-melt membrane, extensive green multi-ply bituminous membrane roof. U-value= 0.074 W/(m2K)
•PUR insulation (50mm) and screed with UFH and floor finishes on top of concrete slab (300mm) and foamed glass insulation below-slab (410mm) U-value= 0.076 W/(m2K)
•Passive House certified, insulated triple-glazed timber-framed windows & doors. Ug= 0.60 W/(m2K), Uf= 0.72 W/(m2K), g-value= 62%
•Entrance door: Bayer Passive House insulated timber-framed door. U-value = 0.81 W/(m2K)


• Building Compactness Coefficient : 0,21

Indicator : n50

• Air Tightness Value : 0,41

Users' control system opinion : It's an incredibly simple and robust building in use. 

More information

Lark Rise consumption was monitored during 2 tenancy periods, user preferences can cause variations in the floating demand seen in the cooking and lighting levels, however, we would expect the miscellaneous circuit to show a relatively constant demand between tenancies because the circuits which are fed by the ‘miscellaneous’ submeter shouldn’t be greatly affected by user preference, however there was an unexpected consumption on the 'miscellaneous' circuit (pumps etc) during the second tenancy period. At present the cause of the variation in miscellaneous power demand is not known. However, the pump within the septic tank burnt out in November 2017, and it is possible that the increased consumption could be due to this.

Real final energy consumption

Final Energy : 42,00 kWhfe/m².year

Real final energy consumption/m2 : 42,00 kWhfe/m².year

Real final energy consumption/functional unit : 42,00 kWhfe/m².year

Year of the real energy consumption : 2 016

Systems

Heating system :
• Heat pump
Hot water system :
• Heat pump
Cooling system :
• No cooling system
Ventilation system :
• Natural ventilation
• Nocturnal Over ventilation
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Heat pump
• Renewable energy production : 200,00 %
Other information on HVAC :

Zehnder, Paul Novus 300
eff. specif. HRE: 91%
Maximum flow rate [m³/h] 300
Electric power input [W] 90
Sound power level [dB(A)] 43
Reference flow rate [m³/h] 210
Reference pressure difference [Pa] 50
SPI [W/(m³/h)] 0,22
heat exchanger

12kWp PV installation on the roof with a 13kWh battery store

Solutions enhancing nature free gains :

Since most of the glazing is sub-optimally oriented to face North West, it needed to be made from super-clear glass with a high g-value in order to maximise winter heat gains

Smart Building

BMS :

Very simply that the heat pump will heat the hot water to a few degrees above set temperature if there is excess sun.
The building use, PV production, battery storage and import or export can be seen in real time via the Tesla application on a mobile phone. This information is being used to tune the building and to decide what the next steps might be (e.g demand shifting or change of user habits eg switching off lights and IT and gaming equipment on standby.)

Smartgrid :

not yet applicable, but may follow

Users’ opinion on the Smart Building functions : Interested in viewing the information provided by the Tesla app.

Urban environment

n/a

Product

LIGNO TREND Roof system



Klimaholzhaus

Ralf Harder ([email protected])

 https://www.klimaholzhaus.com/construction/


Product category : Gros œuvre / Charpente, couverture, étanchéité

Load-bearing insulated CLT ceiling component

Good

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Kaufmann Zimmerei und Tischlerei, Reuthe, Austria - first floor timber frame structure and finishes.

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Shoeck Isolators for balcony connections

Life Cycle Analysis

This is a very interesting topic, but not yet assessed for this building. On another similar project, but with 1/4 the generating capacity, we found that the embodied energy from the building's construction could be paid back in 60 years. This building is

Eco-design material : N/A

Water management

All waste water is processed on site using a low energy septic tank and zero energy natural water polishing system based on natural bacteria in a peat store.

Indoor Air quality

Other similar projects of ours have been independently monitored, tested and assessed with the conclusion that they provide optimal conditions with optimal RH generally around 40% with any peaks being flushed away within an hour by the heat recovery ventilation system. CO2 levels have been found to be optimal, generally between ambient external conditions and an upper level on occasions no greater than 1000ppm. F8 incoming filters have been found to control incoming pollen and particulates. Healthy construction using natural materials has been found in another project to result in a very low VOC count, both from the building construction materials and from household products.

Comfort

Health & comfort : The above indoor air and humidity conditions contribute to very healthy and comfortable conditions. Also both summer and winter temperatures have been found to be very comfortable, with negligible seasonal, daily or hourly fluctuations.

Calculated indoor CO2 concentration :

500-800ppm

Measured indoor CO2 concentration :

500-800ppm

Calculated thermal comfort : 21 degrees centigrade in summer and winter

Measured thermal comfort : approx 21 degrees centigrade in summer and winter

Acoustic comfort : The concrete construction with first floor screed floating on XPS insulation makes for an extremely comfortable acoustic condition.

GHG emissions

• GHG in use : 16,00 KgCO₂/m²/year
Methodology used :

Indirect emissions from electrical power consumption are estimated in PHPP through the use of electrical emission coefficients in Germany (GEMIS)