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Chapter 14: Q19Q (page 390)

The floor of a house on a foundation under which the air can flow is often cooler than a floor that rests directly on the ground (such as a concrete slab foundation). Explain.

Short Answer

Expert verified

If the floor of a house is on a foundation under which the air can flow, it will offer better heat convection and replace the heated air below the foundation with a relatively cooler air.

Step by step solution

01

Concepts

When the heated floor transfers its heat to the concrete, it indicates the process of conduction.

However, when the heated air below the foundation is replaced by the cooled air from outside, it is heat convection.

02

Explanation

A floor on a foundation under which air can flow has twice open surface area contact with the air than the floor on the ground. Also, the ground or concrete slab is not a good conductor of heat.

The heat from the floor is transferred to the concrete, and it is trapped there; so it keeps the floor hot. However, when there is a foundation to allow the airflow below the floor, the heat transferred to the foundation from the floor makes the air hot.

This hot air is replaced by cold air as a part of convection. It keeps the floor relatively cooler.

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