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Passive Solar Buildings – Concept, Benefits and Performance

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Passive solar buildings uses solar energy for its energy needs in different seasons. The Concept of passive solar buildings, performance and benefits are discussed. The rate of increasing population growth with increasing innovations in the field of industries and technologies have all together resulted in the increasing energy consumption enormously. This high consumption is a concern for sustainability. This has a negative impact on the environment and energy conservation. So, an innovation in building construction, that would perform with the existing energy, without exploiting any additional mechanical or electrical sources is called as passive solar building design concept. These buildings take the advantage of the climate, where it must be constructed. A proper site analysis would judge the performance of the building. The concept of passive solar buildings is adopted in new buildings. But already existing buildings can be retrofitted to behave passively. The building is named passive solar buildings because we don't make use of any mechanical or electrical devices within the building to bring the concept.

Concept of Passive Solar Buildings

The main concept of passive solar buildings is that its building elements i.e. the windows, walls and the floors are made able to collect solar energy and store them. This energy is then used in the winter for warmth and used to reject the heat during the summer seasons. The buildings convert the solar energy into useful energy without the help of any other mechanical system. The passive solar buildings work based on the following principles:  

Elements Considered for Passive Solar Building Construction

The main elements considered are:

Fig. Passive Solar Building Elements

Performance of Passive Solar Building

The efficiency of passive solar buildings depends upon the following factors: It is found out from the studies that when the passive system and the concept of energy conservation come together appropriately to sink with the climate, the net benefit is tremendous. The net benefit is defined in terms of backup heat reduction compared to a conventional building system.

Results from Monitored Buildings

A set of passive solar buildings were monitored for one or more years by using twenty or more sensors that record hourly. The results from the computer analysis of data give us the following results:

Benefits of Passive Solar Buildings

The benefits of passive solar building systems are as follows:

Problems Faced by Passive Solar Buildings

The passive solar building system is an innovation which is still in its developing stage. It presently faces two main concern that would result in other problems. The main two problems are discussed here:


The result of improper design causes overheating by the sun. This can occur either in summer or in winters. If the glazing provided in the south is oversized or insufficient or insufficient thermal storage mass for direct gain are the reasons of overheating in winters. A storage size that would limit the temperature within the building to 220C must be adopted. When the facing of energy gain is more towards east or west, there are chances of overheating in summer seasons. This is a common issue found. The best remedy for this is to make use of south facing glasses and avoid glasses with any other orientation. Skylights and overhead glasses must be covered in summer. Enable natural ventilation to avoid internal overheating during summers.


When a new building concept is put forward to the society, the first essential feature everyone should understand is what is the scope of the new concept? The problem of public, or the building industry or any of the designers is the lack of proper perception. They are not ready to compromise their design and aesthetics for energy conservation. They are more concerned about the looks of their homes and this stops them to built their structure based on the passive solar design concept. The only solution for this is public education. Studies on passive solar buildings with more architectural and aesthetics ideas must be made. Commercial buildings like schools, libraries have an excellent space of passive solar building design concept. Read More: Zero Energy Buildings – Features, Benefits and Materials Types of Skylights for your Building Roofs
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