|Design Handbook on Passive Solar Heating and Natural Cooling (HABITAT, 1990, 162 p.)|
In the detailed design stage the designer is able to test all of the various elements of the building with a reasonable degree of precision. As the overall design is refined, so too should be the thermal design details such as insulation details, shading design and window design.
The external fabric design is tested for reduction of solar gains in summer and for control of conductive heat loss in winter.
External shading of openings is refined to control solar gains. Sunlight should be excluded from entering the building during certain times in order to minimize summer overheating. This is the time to determine the controlling factors in the design of shading devices (shadow cut-off angles, horizontal projections and heights above sills etc.), so that they provide the desired shade in summer and sun penetration In winter.
A final check of the north-glass area to the mass-area ratio can be made at this time using the evaluation techniques referred to above.
Construction details are developed for appropriate control of infiltration during winter and to prepare specification notes about construction quality control.
The final detailed design is tested using a suitable PC- computer-based thermal performance model such as CHEETAH, TEMPAL or ARCHIPAK.