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Solar Energy Thermal Systems: A Web Course By: in This Module 25, Lecture Nos. 36, 37 and 38 Deal With

This document discusses passive architecture structures that can be used to maximize solar heat gain in winter and minimize it in summer. It describes how overhangs and high sloped roofs commonly seen in mountainous regions help achieve these goals. Specifically, it outlines several passive architecture techniques including direct gain, convective loops, thermal storage walls, roof ponds, attached greenhouses, heat storage, and heat transfer control. Common systems using these techniques are Trombe walls, solar roof ponds, and thermosiphon air collectors.

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Ajit
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48 views2 pages

Solar Energy Thermal Systems: A Web Course By: in This Module 25, Lecture Nos. 36, 37 and 38 Deal With

This document discusses passive architecture structures that can be used to maximize solar heat gain in winter and minimize it in summer. It describes how overhangs and high sloped roofs commonly seen in mountainous regions help achieve these goals. Specifically, it outlines several passive architecture techniques including direct gain, convective loops, thermal storage walls, roof ponds, attached greenhouses, heat storage, and heat transfer control. Common systems using these techniques are Trombe walls, solar roof ponds, and thermosiphon air collectors.

Uploaded by

Ajit
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Principles and Performance of Solar Energy Thermal Systems: A Web Course by


V.V.Satyamurty
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MODULE 25 Lecture Nos: 36


Passive Architecture, Overhangs and wing walls
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In this Module 25, Lecture Nos. 36, 37 and 38 deal with


Lecture 36
25.1 INTRODUCTION
25.2 SOME PASSIVE ARCHITECTURE STRUCTURES

Lecture 36
25.1 INTRODUCTION

It appears that a great potential exists in exploring the solar architecture for building cooling or heating. In
the discussion in this Module, the term ‘building’ is avoided; instead the term structure is used. The reason
being the objective in designing all structures, be it store houses, factories, residential buildings, shopping
complexes or many others, is to maximize solar radiation received (to save heating costs, in cold seasons) or
minimize the solar load (to minimize air conditioning load) or at least maintain at better comfort level.
Without active cooling, if a building can be maintained at say, 3 0C lower than what it would be without
solar architectural design, the occupants feel a lot more comfortable. Though, one might have noticed or
not, it is worth noting, almost all buildings in say, Srinagar, Simla etc. in India have high sloped roofs,
same is true in high latitude (cold, snowing) locations.

The objectives mentioned above can be achieved by letting the solar radiation enter the structure, or
be absorbed by the structure for heating and the opposite to cool. Some intelligent design and innovation
achieves both. It is fortunate that sun - earth relative positions in summer and winter favor achieving both
objectives. In summer, when the sun is almost overhead, vertical or high sloped surfaces do not receive high
radiation, where as, in winter when the sun is low, the near vertical surface receives a higher radiation. This
difference is accentuated as the latitude increases.
25.2 SOME PASSIVE ARCHITECTURE STRUCTURES
Passive architecture involves including some of the following:
1. Direct gain
2. Convective loops
3. Thermal storage walls
4. Roof ponds

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5. Attached green houses


6. Heat storage and
7. Heat transfer control.
Specific systems commonly implemented are, Trombe walls, solar roof ponds and thermosiphononing
air collector. Anderson and Michal [57] described in detail the architectural constituents mentioned above
and the design of the common systems such as Trombe wall.

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