From detailed simulations carried out for the library, constructive solar shading in the skylights has been developed. The constructive solar shading has a depth of 200 mm and is placed every 500 mm in each side of each skylight. The constructive solar shading contributes to the daylight distribution inside the library and at the same time decreases the level of solar radiation into the library thus increasing the level of comfort.

Furthermore, the level of daylight and daylight distribution has been optimized with simulations and after construction the level and distribution of daylight meet our expectations. Glare problems has been avoided by using the simulations to optimize the inventory plan, the construc­tive solar shading in the skylights and a solar curtain in the children’s section.

skylights makes Albertslund Library highly suitable for natural ventilation by using the facades as fresh air intakes and remove the exit air through the skylights. Thereby, the building will act as a ventilation duct for distributing the fresh air inside the library. The fresh air is then distributed by displacement.

Fresh air intakes are situated along the facade between the facade windows. A convector is integrated in the intake for preheating of the fresh air. The fresh air intakes are controlled with a damper in each intake, which is connected to the BMS.

The minimum temperature of the intake air is 18 °C and the amount of fresh air is controlled by the CO2 level during the heating season and by the indoor temperature outside the heating season. The openable areas in the intake and exit are dimensioned after a rate of air change of 3 h-1 thus keeping the CO2 level at a satisfying level.

5.3 Indoor Thermal Climate

The indoor thermal climate of Albertslund Library has been simulated with the thermal simulation program BSim2002 (BuildingSimulation 2002), which is a computer based calculation program for simulation and analysis of the indoor climate and energy consumption in buildings.

According to Danish guidelines indoor thermal climate in offices, DS474, the annual number of hours during the opening hours for a whole year should not exceed 100 above 26 °C and 25 above 27 °C. Simulations with BSim2002 verified that these guidelines are held for Albertslund Library and that the indoor thermal climate overall is satisfying.

SHAPE * MERGEFORMAT

5.2 Natural Ventilation The shape of the library with open space and high roomheight together with the renovation of the facade and installation of

STIEBEL ELTRON

Combination of Heatpumps and Solarsystems — Possibilites and limits

The WPF..SOL series is the perfect combination of heat pumps, solar water heating and solar heating-system booster. You can keep energy and operating costs extremely low and make a substantial contribution in safeguarding the environment. The WPF..SOL series offers four different power outputs (5,5 kW. 7,3 kW, 9,5 kW,

12,7 kW) to best suit one or two-family houses.

These units distinguish themselves for their extremely noise-free operating. The space-saving design makes the installation of these units possible not only in cellars but also in hobby or utility rooms. The WPF..SOL offers excellent performance all year long both in brine/water and water/water operating mode. Depending on the operating mode, you can collect heat either from the ground or from groundwater. This heat can be used both for heating and hot water supply. In this system the heat generated by the sun is given absolute priority in heating and hot water supply. This way up to 80% of the heat needed to heat your home can be obtained from the exploitation of regenerative energy. In our units the control unit for the heat pump and the solar energy system are already built in to assure efficient operating together with the SBK 600/150 combi storage heater for heating and hot water supply.

Ground or groundwater plus solar energy as the energy source at choice

Recommended in particular for one and two-family houses

Heating and supply of hot water with the SBK 600/150 combi storage heater

Optimal solar energy exploitation

Extremely low energy and operating costs

Figure (1) shows the acceptability for the government aid program ‘KFW 60 und KFW 40′

Erforderliches qH fur das KW 60 und KfW 40 Haus

WPF 35/28 (Nr. 51) LWA 35/28 (Nr. 56) LWZ 35/28 (Nr. 57)

LWZ SOL 35/28

( ) Anlagennummer nach DIN V 4701 Teil 10 Beiblatt

STIEBELELTRON

Highest energy efficiency even for passive houses is guaranteed by the LWZ 303 SOL. For example, in the heat pump operation mode the system can use energy not usually available for central ventilation, room and water heating. Just by warming up the outside air using an additional heat exchanger. A built-in ventilation control keeps the airflow volume just right. Solar energy is utilized to heat water and assist the heating system.