The windows can have Jalis. Jalis have several benefits.
1. They serve as natural air conditioning by reducing the temperature (when air is compressed and released it becomes cool)
2. Allows for the movement of air for cross breeze and ventilation.
3. Increases the velocity of wind, so even if there is mild breeze outside, when it passes through the Jali, it becomes faster.
4. Helps cut the glare of sunlight but let's illumination through.
5. Provides privacy because from within the building, everything is visible through the Jali holes but from outside, nothing is visible due to light difference.
List of contents:
1. Guidelines for incorporating Jali windows
4.Alternative to traditional Jali windows.
Jalis
Guidelines
Design and Placement:
Select Jali window designs that blend with the building's architectural style. Click here to see different Jali designs.
Determine the best locations for installing the Jalis. Consider factors such as the direction of sunlight and prevailing wind patterns.
Sizing and Density:
Calculate the required size and density of the jali windows based on the desired level of ventilation and the volume of the interior space.
Interior Volume: Calculate the total volume (cubic meters or cubic feet) of the interior space that requires ventilation.
Desired Ventilation Rate: Determine the desired number of air changes per hour (ACH) for the interior space to maintain comfortable temperatures and air quality. A common range is 4 to 20 ACH.
Privacy Requirements: Assess the level of privacy needed in the interior space. The opacity of the Jali design should align with privacy preferences.
Jali Size and Density: Based on the ventilation rate and the interior volume, calculate the number of Jali windows required. Choose a jali design that provides the required openness (percentage of open area) for ventilation while maintaining privacy.
Window Placement: Determine the optimal placement of jali windows to maximize airflow and cooling. Consider prevailing wind directions and the sun path.
Solar Heat Gain: Analyze potential solar heat gain through the jali windows. shading solutions may be needed to control heat gain.
Building Orientation:
Align the building's orientation to maximize the benefits of jali windows in capturing prevailing winds and cooling the interior spaces.
They can be used as wall partitions to separate different areas within a space while maintaining visual connectivity. Their intricate designs allow ventilation and light to filter through, creating a play of light and shadow.
1- Jali windows
2- wall partitions
Types of Jali designs in Bidar.
How do Jalis work?
1. Jalis serve as natural air conditioning.
It works on two important principles of physics - Bernoulli’s principle and the Venturi effect.
Bernoulli’s principle states that as the speed of a fluid increases, the pressure decreases and vice versa.
Bernoulli equation describes the relationship between velocity and pressure.
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where p is pressure, is the fluid density and v is velocity. The above equation shows that, in the event of a pressure drop, the velocity increases and vice versa
The Venturi effect is a specific application of Bernoulli's principle. It occurs when a fluid flows through a constricted or narrowed section of a pipe or tube.
The Venturi effect is the drop in pressure as fluid flows through a constricted area. As the pressure drops fluid velocity increases.
This means that as air moves through the narrow designs or cuts on the screened structures, the speed of the air increases. Thus, there is a perceptible presence indoors even with a mild breeze outdoors.
The principle of thermodynamics suggests that when air is compressed and released, it becomes cool. This implies that when air moves through a Jali, not only does the speed increase, but it also becomes cooler.
This is similar to an air-conditioner where a compressor, as the name suggests, compresses the air and releases the same through micro holes.
2. Helps cut the glare of sunlight but lets illumination through, not affecting the intensity of light. By breaking a window's total aperture into tiny openings, the Jali acts as an overhang. If the openings are the same size as the materials' thickness it acts as a louver, protective of glare and direct sunlight.
Alternative to traditional Jali windows.
This window design uses passive ventilation strategies for maintaining a cool interior environment. The window has Jali shutters that can be opened and closed. The jali shutters help reduce the temperature of the air passing through it.
For added versatility, the window includes sliding glass panels, enabling a complete seal when necessary.
Embracing both functionality and aesthetics, this design provides an eco-friendly solution for maintaining a cool interior environment.