When the room is provided with a suspended ceiling, the load of the outer envelope structure should be calculated according to the following principles:
1. When using a grilled ceiling or a closed air-conditioning return air ceiling, the calculated size of the outer envelope structure should be considered according to the non-ceiling
2. When a dense ceiling is used and the air conditioner is not a ceiling return air, the part of the exterior wall in contact with the ceiling should be included in the calculation height of the exterior wall of the room according to the ceiling height of not less than 1 2;
3. The roof of the room on the top floor of the building should be calculated as no suspended ceiling.
Special reminder:
When a lattice ceiling is used, the ceiling space can be considered as part of the interior;When the ceiling return air is used (whether or not the grille ceiling is used), the heat transfer formed by the outer envelope structure to the ceiling will be carried away by the air conditioning return air, thus increasing the cooling load of the air conditioning system.
If there is no air circulation in the ceiling, the heat transfer from the outer envelope to the ceiling will cause the air temperature in the ceiling to rise, and then pass through the ceiling and then enter the room. Therefore, this part of the cooling load should be taken into account at this time.
For the top floor, due to the large amount of solar radiation in the horizontal plane and the high temperature of the ceiling space, from the safety perspective of load calculation, it is advisable to consider the non-suspended ceiling. In the case of closed ceilings, the air layer of the ceiling and its space can also be calculated as part of the calculation of the thermal resistance of the roof.