Figure 4.11 Types of passive heating systems

 Passive heating systems that collect and distribute the heat in 4 hours or less are called prompt systems.  Ones that perform this process and take more than 12 hours to release the heat are called extended systems.

Most passive solar heating systems are designed to release their heat between 4 and 12

hours. This is often the case of passive heating systems in commercial or office type buildings, which are not occupied for more than 10 to 12 hours a day.

Passive solar heating systems are categorized by the method of the transfer of the stored heat, i.e. the relationship between the solar system and the building, that is, whether or not the solar system is part of a room being heated, part of the building, or totally separate from the building.

Therefore, there are three types of passive solar heating systems, such as:

1. direct gain systems 2. indirect gain systems 3. isolated gain systems

Figure 4.11Types of passive heating systems