Thermal Mass in Buildings Webinar 2015 quiz


Please answer the following 8 multiple choice questions, then click 'submit' to check the result. The pass mark for a CPD certificate is 6 out of 8, and you may retake the quiz as many times as you wish, but the questions will vary! Please note that one, two, three or all of the possible answers presented for each question may be right, and to gain a mark for that question all correct answers must be identified.

Good luck

Thermal Mass in Buildings

In the Aecom study, which, if any, of these floor systems provided the best thermal mass performance?

Composite metal deck slab
Reinforced concrete flat slab
Hollow core precast plank
They all provided the same performance

In the example of the London high rise office block, which of the following statements is/are correct?

For reasons of security and pollution, one would not normally try to use thermal mass and natural ventilation in this type of building.
The thermal mass that could be mobilised in the building was independent of floor type.
The benefit of the thermal mass was balance by the extra heating and cooling required for the space opened up by the removal of the ceiling tiles.
All of the above.

Both the Wessex Water building and the Cooperative HQ building utilised thermal mass. What was/were the common construction feature/features?

A composite metal deck floor
Beams support exposed precast concrete coffer units that sit on the bottom flanges of the beams.
Large atria allowing natural daylight to penetrate the floor plates.
All of the above.

It has been claimed that structurally massive buildings with thick floors can mobilise greater levels of thermal mass than lightweight buildings during a prolonged warm period because temperature variations can penetrate a greater distance into the slab than is possible on a diurnal cycle. What might be wrong with that claim?

It has not been tested and proven
It has the potential to create a giant thermal ‘flywheel’ within the building which will increase the radiant temperatures.
The thicker slab may take longer to cool when the weather eventually breaks thus prolonging the effects of the warm period.
All of the above

The quantity of mass in a building which can be linked to the internal atmosphere to provide thermal mass is governed by the ............ of the material of which the construction, usually the floor slab, is manufactured. What word is missing?


Which of the following statements is/are correct with respect to using permeable ceilings when utilising thermal mass?

An open area of 40% is about the maximum that can be used if a perforated ceiling is to hide the soffit.
Under test conditions, over 85% of the cooling effect of an exposed soffit can be obtained with a thin perforated steel ceiling.
When using a perforated steel ceiling, the loss in convective heat transfer is partly compensated by the action of the thin metal tiles absorbing and re-radiating heat from the air into the slab.
All of the above.

Which of the following featured in the office/library case study in Seaham?

In parts of the building, acoustic suspended ceiling panels were installed to improve the acoustic environment.
A composite metal deck floor.
Water cooling in the floor slab.
All of the above

When casting an in-situ concrete floor, an aesthetically pleasing soffit may be required. Which of the following were identified as being necessary to ensure that this is achieved?

Formwork must be new and complete sections between designated construction joints must be capable of being concreted in a single operation
Formwork must be adequately supported to prevent differential movement
High standards of dimensional tolerance in casting the slabs is required and aesthetic surfaces must be protected after preparation to retain the specified surface finish.
All of the above