The problem of achieving good air quality in dwellings whilst saving energy has led to a number of solutions many involving the use of fan power. This paper describes a programme of testing, that has continued over the last three years, of a passive low energy ventilation system. The systems components are supply air window in combination with passive stack vents. Installations have been monitored in unoccupied dwellings in Poland, Denmark and Ireland and user feedback is now being collected, the units now being occupied.
Until the 1970’s most office buildings in central Europe were not equipped with mechanical cooling (airconditioning). Due to increasing requirements for thermal comfort and warmer summers, nowadays mechanical cooling is often applied to such buildings, ho
In highly insulated residential buildings, complying with the Passive House Standard, the space heat demand can be covered by air heating at air flow rates given by air quality requirements, without the need for additional air re-circulation or for a water heating system. The air distribution system is kept compact. In a common concept the supply air terminal is located above the door to the corridor. Such configurations were evaluated for typical air transfer devices and extreme supply temperatures.
A low energy office building in Frankfurt (Germany) with water heating/cooling from ceilings was submitted to detailed measurements during two years, in the frame of a demonstration project. Results are given showing thermal comfort and energy consumption data.
Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house. This article is the second one of a serie of two. The first one was dealing with ventilation. This one mainly concerns heating system and domestic hot water production through a gas boiler. It also gives general conclusions, some of them dealing with ventilation.
Approximately 300 low energy houses have been built in the Republic of Ireland by the multi-national CRH Plc and South Dublin County Council as part of a co-ordinated European Commission-supported demonstration project, RE-Start (Renewable Energies Strategies and Technology Applications for Regenerating Towns).
The project is a survey of 12 'off-grid' households across Canada. The objective was to document off-grid energy use and lifestyle patterns to determine if there are lessons or examples of energy conservation that apply to conventional grid-connected houses. The houses operate on systems using renewable energy as the primary source of electricity. An airtightness test was performed on 10 houses (two houses were not viable for testing because of renovations).
Describes low energy houses which have been built at Lindas in Sweden. A traditional heating system has been replaced in the design by heat exchanger in combination with an exceptionally well insulated construction. The terraced houses maximise use of passive solar gains, while balconies and projecting eaves protect against excessive solar radiation during the summer. External walls are exceptionally well insulated and airtight. The ventilation system consists of a supply and exhaust air unit with a counter flow heat exchanger that provides 85% heat recovery.