Objective
The aim of the L.E.O. project is to demonstrate the usefulness of innovative approaches to sensible power consumption, power economisation, and passive solar energy utilization in office building engineering. Measures of power economisation in office building construction have been unattractive to date, because of the facility with which power costs can be passed on to users and tenants.
Still, along with the growing awareness of the possibilities for avoiding hazardous materials pollution, the willingness to do more here has grown in this construction branch. What is missing is extensive experience with innovative designs for office buildings that economise power and spare the environment, which is needed to generate wider acceptance among customers, architects, and engineers.
The yearly consumption costs for 1995 are added to a value of 1.33 DM/sm/mon (comparison values are in a range of 400 to 700 DM/sm/mon.)
With it the aim of integrated overall concept, "to demonstrate that innovative designs for office buildings can economise power (and so on costs) and spare the environment" is totally reached.
Exemplary mentioned of all parts shall be the earth channel and the night cooling to avoid the use of a conventional air-conditioning. The measurable data shows that substitution of a high energy consumed installation is possible.
An office building designed for power economisation and improved comfort is erected in a northern suburb of Cologne. The overall design will incorporate a number of co-ordinated, innovative measures, integrating them into a single civil engineering concept. The project objectives and measures are as follows.
1. Reduction of heating energy requirements.
- Compact building design. The atrium building design makes it possible to provide daylight illumination for a large number of workplace from two directions without the disadvantage of a large facade.
- Reducing ventilation losses. Ventilation losses are reduced to a minimum thanks a ventilation supply and exhaust system using a double heat recovery (efficiency in excess of 80%) and a concrete earth channel. Integrated supply and exhaust piping with double-walled ceilings obviates the need for double ceilings or floors.
- Passive utilization of solar energy. Two advantages are achieved by having the building face south: the available solar radiation is used to the maximum degree possible during the warming period, while the overheating problem in summertime is minimised by avoiding facing east and west.
- Thermal insulation for reduction heat transfer losses. By providing thermal insulation of the external structure going beyond the legislated requirements, it is possible to reduce heat transfer losses significantly. The transparent building components (windows and transparent thermal insulation covering part of the south side) combine excellent insulating properties with a high degree of light transmission.
2. Reduction of electrical energy requirements.
- Daylight re-direction by means of directional blinds. On the south side of the building, there are built-in Venetian-type blinds around the skylights. In addition of reducing glare and direct sunlight, these serve to distribute the natural light in an unform fashion deep inside the building by re-directing the light and using the joist-free ceiling as a reflector.
- Daylight-dependent control of artificial lighting. General artificial lighting is increased and decreased on a half-floor basis, as dictated by the resulated difference of outside- and inside- available daylight.
3. Avoiding the use of conventional air-conditioning plants in offices.
- Controlled ventilation supply and exhaust with concrete earth channel and night cooling.
- Reducing of internal heat generation by equipment and lightning system.
- Reduction of artificial lightning operating time.
After the erection phase follows a two-year measurement period, during which it is intended to assess the predicted functioning of the integrated overall concept. The importance of daylight as a factor for workplaces in office buildings will be an object of the measurement investigation.
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Programme(s)
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Topic(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
50829 Köln
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.