CHH – ChristophorusHaus MIVA, Stadl-Paura, Austria
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Acronym | AdVent Case 11
Posting Date | 25 November 2009
Country | Austria
Geographic Coverage | International
Theme | On-site renewable energy sources, Lighting, General, Very low energy buildings, Heating, domestic hot water, Air conditioning, cooling, ventilation, air infiltration
Target Group | Building professionals
Abstract | The principal objective of the design was to reduce energy demand to ‘passivhaus’ standards,
with the remaining energy demand covered as far as possible from renewable sources, while
simultaneously providing occupants with a high standard of comfort. Heating loads were
minimized by the use of a high level of insulation and limited glazing area with the aim of
reducing heating consumption to 15 kWh/m². Infiltration losses were reduced by designing
for an air tightness of 0.6 ach at 50 Pa. Heating is supplied using an air distribution system and
ceiling panels in the office and seminar rooms, supplemented by underfloor heating in the atrium
area. The air supply system, incorporates heat recovery in the form of air to air heat exchangers,
with efficiencies in the range 78% to 86%. The heating systems are supplied with water
heated by a heat pump (43 kW; COP = 4) which uses water circulated through pipes in
deep boreholes as its source. In summer, cooling is provided by circulating this
water through the ceiling panels and heat exchangers in the air supply system.
Additional reduction in peak summer temperatures is achieved by using high thermal mass in
the interior of the building and night-time natural ventilation. In addition domestic hot water is
served by 5 m² solar collector. Photovoltaic collectors on the façade and roof provide 9.8 kWpeak
electricity.
Illustrations | 
Description | The building was completed in 2003 and serves a missionary organisation dispatching goods to developing countries. Its use is multifunctional, serving to provide office accommodation, seminar rooms, restaurant and exhibition facilities, warehousing and a loading bay. It consists of three floors and a basement. Office and public areas are occupied by 40 people and have an area of 1 215 m². The remaining building area is used for parking vehicles (325 m²) and a basement (550 m²). The building is semi-circular with a central atrium.
Web URL(s) of the case | http://www.buildingadvent.com
Lessons learnt | The successful outcome of the project showed the importance of integrating the work of the design
team at an early stage and coordinating all aspects that related to energy consumption. The project
also demonstrated the need to ensure that the design matched closely the expected pattern of use
of the building. Other lessons included:
-Sensor-controlled lighting and shading devices are very efficient in ensuring optimum
use of daylight
- The use of a ventilation system controlled by CO2 sensors provides a high level of air quality
- It is important to ensure that the ventilation and heating systems are turned off during
periods when the building is not occupied
- Systems should be monitored on a 24 hour basis so that action can be taken by in the
event of a problem occurring
- Continuous monitoring of the energy used by the building enables. Monitoring of the whole energy system is very useful to find out if the design of the building and its energy
supply worked well
Award labels | none
Additional documents |
Case Languages | English
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