The document compares solar protection simulations for single and double pane windows with awning sunshades. It finds that using a triple pane window and awning sunshade reduces maximum cooling and heating loads compared to other configurations. Specifically, it decreases cooling load by 9W and heating load by 36W. The use of sunshades in summer reduces energy usage by 45-50% for both windows, but in winter their use should be avoided as it decreases energy usage by around 30%.

1. Solar protection in
buildings using PARASOL
(BEA software)
By
ANIRUDH B
ME Energy

2. Introduction
Parasol can produce the following results:
Primary and total solar transmittance for the sunshade and
the window for each month during a year.
Daily values of cooling and heating demand, and the
maximum cooling and heating input over the year.
Duration diagrams for indoor temperatures and cooling
and heating load.
Duration diagram for operative room temperatures.
Daily values of primary transmitted solar radiation.
Design days for heating and cooling.
Monthly and annual values of energy use for pre-heating
and pre-cooling of the inlet air.
Monthly and annual values of electricity output when a
sunshade of type PV screen is used.

3. Comparison of two different window
structures and sun shades
1.Solar protection simulation using single pane window and
awning sunshade:
Geometry of the room:

4. Comparison of two different window
structures and sun shades
1.Solar protection simulation using single pane window and
awning sunshade:
Window embrasure and
frame:

5. Comparison of two different window
structures
1.Solar protection simulation using double pane window and
awning sunshade:
Site and orientation:

6. Comparison of two different window
structures
1.Solar protection simulation using single pane window and
awning sunshade:
Walls construction:

7. Window type:

8. External Sunshade: Awning

9. Interpane Sunshade: Venetian blind

10. Internal Sunshade: Pleated curtain

11. Solar Transmittance Simulation: Double pane window with
awning sunshade

12. Solar Transmittance Simulation: Double pane window with
awning sunshade

13. Energy Balance Simulation: Double pane window with awning
sunshade (Energy required to keep the inlet air at 17 deg C)

14. Energy Balance Simulation: Double pane window with awning
sunshade ( solar insolation with and without sunshade)

15. Energy Balance Simulation: Double pane window with awning
sunshade ( heat and cold energy required with sunshade per day)

16. Energy Balance Simulation: Double pane window with
awning sunshade (design days – peak load)

17. Energy Balance Simulation: Double pane window with
awning sunshade (design days – outdoor temp)

18. Solar transmittance Simulation: Triple pane window with
awning sunshade

19. Solar transmittance Simulation: Triple pane window with
awning sunshade

20. Energy balance Simulation: Triple pane window with
awning sunshade

21. Energy balance Simulation: Triple pane window with
awning sunshade

22. Energy balance Simulation: Triple pane window with
awning sunshade

23. Energy balance Simulation: Triple pane window with
awning sunshade

24. Energy balance Simulation: Triple pane window with
awning sunshade

25. Conclusion:
Solar protection in buildings is simulated for two different
window structures and arrived with the following conclusion:
The maximum cooling and heating load decreases by 9W and
36W when triple pane window is used.
Therefore the cooling and heating demand also decreases
accordingly.
The usage of sunshades during summer conditions is a must
since it reduces the energy usage by nearly 45 -50% (in both
window structures)
The usage of sunshades during winter conditions must be
avoided since it reduces energy usage by nearly 30% (in both
window structures).

26. References:
PARASOL V6.6 – Energy Efficiency and Renewable Energy, US
department of Energy.