Buying Guide to Ceiling Fans

With India being a tropical country, fans are a must have for every home. Fans make you feel comfortable in a room by circulating air. There are a wide variety of fans to choose from, from simple finishes to decorative, four blades to three blades, high air delivery to low noise. Such multiple choices make it difficult to choose the right fan, so let’s makes your choices simpler: Here are a few quick facts that will help you to choose the right fan.

Why ceiling fans are required?

The primary purpose of a ceiling fan is to provide ventilation and improved air circulation to make you feel cooler by virtue of the velocity of air. It is like the comfort of a breeze in an otherwise warm day.

Being a key part of the room decor, ceiling fans can provide a room not only with a comfortable environment but also with appropriate lighting, a decorative touch and enhanced aesthetics appeal.

How fan makes you feel cool?

A ceiling fan cools a room by creating a “wind chill effect”; and not by lowering the room temperature. “Wind chill effect” makes you feel cooler by accelerating the evaporation of perspiration on your skin. It is the feeling you get when you open the window in a moving car.  An air skin velocity of ~1.5 m/sec makes one feel cooler by over 5 0 C.

If you run a ceiling fan in a room whose temperature is 27 degrees, it will create a “wind chill effect” making you feel as if the temperature is 22 degrees. When used in conjunction with an air conditioner, a ceiling fan can lower energy costs, because you can set the thermostat of your air conditioner at a higher temperature.Fans1

How to determine Ceiling Fan Sweep Size?

You should select a fan based on size of the room. Fan sweep size is measured by taking the width straight across from one blade tip to the other blade tip. A fan larger than necessary is fine as long it has space to rotate properly. A fan smaller than needed does not effectively circulate air.

Room Size Fan Sweep
4m* 5m to 4.5m *4.5 m 1400 mm
3.3m*4m to 3.7m *3.7m 1200 mm
2.7m*3.3m to 3m*3m 1050 mm
2.4m *2.7m to 2.4m *2.4 m 900 mm

Important:-To optimize air delivery, your fan should be approximately 3 meters from the ground and 0.3 meters from the roof.

Calculating distance between two fans.

For Larger rooms with more than one fan, the shaft distance between each fan will depend on the sweep of fan.

Sweep of Fan 36″ 42″ 48″ 56″
Centre of difference 1.8 m  2 m 2.5 m 3 m

FANS2

 What is a blade pitch in ceiling fan and why is it important?

 Blade pitch is the angle, measured in degrees, between a 180 degree horizontal plane and a ceiling fan’s blade tilt.

PITCH

Why is it important?

 The angle of the blade makes a difference in how much air a fan is able to circulate throughout a room.

This degree of blade pitch will allow your ceiling fan to move the “just right” amount of air – not too much (you don’t need a wind tunnel in your room), nor too little (you do need to feel a nice breeze).

A good way to understand how blade pitch effects air movement is to equate the blades of the fan to the oars of a rowboat. If you have ever tried to row a boat, you know that if you put the oars in the water virtually flat, it takes very little effort to row; but even if you row very fast, the boat moves very slowly. If, on the other hand, you tilt the oars at a steep angle in the water, it becomes very difficult to row the boat, but each stroke makes substantial progress. You will need to be much stronger and in better shape to sustain a higher rate of speed for any period of time in case of the latter.

This principle applies to airflow of ceiling fans as well. Air delivery of a ceiling fan is the result of the aerodynamics of the fan. Its aerodynamic is governed by blade pitch, blade length, and motor characteristics. Hence higher speed /RPM doesn’t necessarily mean higher air delivery. This is a common mistake one does in fan selection by making decisions based on a single parameter like RPM.

That is why leading manufacturer of fans always go through various designing and testing procedure to ensure that blade characteristics and the motor power complement each another.

How important is motor in a ceiling fan?

The motor is the most important component of a ceiling fan. For example, motors with higher power capability can be matched with high pitch aerodynamic blades to deliver high air at lower speed/RPM and hence lower noise. Thus, for a fan to operate efficiently and effectively, the motor’s characteristics must be engineered to match the blades.

Standard ceiling fans have single phase electric motors. These motors are typically of lower efficiency.  With the need to save energy alternate motor technologies are being explored.  The Brushless DC motor is one such technology which is more than twice as efficient.  There are ongoing active developments to make BLDC more cost effective to accelerate its deployment.

Can ceiling fans be used in winter?

It may seem a bit odd to use ceiling fans in winter, but modern age fans are built for year-round use, saving your money on both heating and cooling costs. This can be achieved by changing the direction of the ceiling fan’s rotation (clockwise or anti-clockwise). Depending on the model, the ceiling fan’s direction can be changed through the reverse switch on the fan’s motor or via a remote control.

FAN3

Ceiling Fan Direction in Summer: Anti-Clockwise

During summers, run your fan’s blades anti-clockwise to blow air downward and create a cooling breeze so you can set your thermostat at a higher setting and still feel cool while saving money on air conditioning costs.

Ceiling Fan Direction in Winter: Clockwise

During winters, ceiling fans can help heating systems to operate more efficiently. Reverse the direction of the blades and set the fan at a low speed. The fan’s gentle upward draft will force any warm air concentrated near the ceiling to circulate down and around the living space.

The modern age fans are manufactured based on lifestyle needs where in a ceiling fan not only acts as device to make you feel cooler but also adds aesthetic appeal to your room.

The HAB at Kala Ghoda Art Festival

1The HAB organised a bookmark making activity for kids at the Kala Ghoda Art Festival’s book swap event in Mumbai on 8th February, 2014.

X-change it, a popular organization that holds such barter events hosted the book swap event for kids between the age group of 4-12, at the Prince of Wales Museum Grounds. As part of the Kala Ghoda Art Festival,  the event gave kids a chance to exchange their read-old books for unread-old books. The HAB’s workstation next to the book swap stall encouraged children to make their own Bookmarks.  The venue was buzzing with several other activities from quiz workshops to a Zumba classes and storytelling sessions.

7

The event scheduled for 11 noon, started on time, with The HAB workstation getting crowded right away!  As children queued to make bookmarks on the Dream Maker 120 Sewing Machine with the help of our resident sewing expert.

6

As the day passed by, the number of children who approached The HAB workstation simply kept increasing. A few of them were as young as 4 and 5 years of age, but were so interested in the activity that they wanted to do it all by themselves without help from their parents or our sewing expert.The kids and their parents were all excited about learning to sew.

5

Ours was the only workstation which attracted both kids and their parents. With several parents being very keen on making bookmarks. By the time the event ended around 5 pm, we had made 130 bookmarks!

4

Kala Ghoda Art Festival Trivia:

  • The Kala Ghoda Arts Festival, now in its 16th year, is a community celebration of the arts within one of the most beautiful and historic precincts of Mumbai, The Kala Ghoda Art District.
  • It is open to all, free of charge.
  • It has traditionally offered various programmes in Visual Art, Urban Design & Architecture, Music, Theatre, Dance , Street Acts, Heritage Walks, Literature and Workshops for children as well as adults
  • The Festival has grown exponentially, and is hugely successful, drawing over 150,000 people from all over the city to 350 events over 9 days. Tourists from all over the world plan their trip to Mumbai to witness the Kala Ghoda Arts Festival.
  • Funds raised from the festival go towards the restoration and upkeep of the area. Several heritage buildings and institutions in the area have benefited from this.

3

Your Coffee Machine and You!

coffeeLove your cup of Coffee? But plagued with Coffee Machine choices? If you are looking for something efficient and stylish for your home, Usha Coffee Machines are the ones to go with. They are all aesthetically pleasing and efficient Coffee makers , with one of them even featuring a Bamboo finish!

Electric Drip Coffee Maker

  • Also known as the dripolator, this machine houses a reservoir in the base which is called as the hose.
  • Cold water enters the reservoir through a thin metal tube
  • The water moves to the heating chamber when machine is turned ON
  • Water once heated in the heating chamber moves to the sprayer via the rubber hose. This movement through the rubber hose is achieved via the effect of thermally induced pressure and siphoning effect
  • The ground coffee placed on the brew basket is perched below the sprayer head
  • Hot and pressurized water passes through the ground coffee and drips down into the carafe of capacity 10-12 cupscoffee 1

Espresso Coffee Machines

       These machines rose to fame in the 18th century, designed specifically to cater to the bold taste of espresso.

  • These coffee machines can use any kind of ground coffee including both dark and light roasted ones
  • Modern makes of these machines come with a dual spout that allows two different espresso shots simultaneously
  • Adjustable short length provides the desired espresso shot in taste

French Press (No electricity needed)

The French Press was developed in the 1850’s. This is the oldest and the simplest of coffee making mechanism without the use of electricity. It comprises of a tall glass cylinder, a plunger and a filter.

  • The user has to place coarse ground coffee at the bottom of glass cylinder
  • Pour boiling hot water into the glass cavity
  • Stir the entire mixture with a metal spoon and let the brew sit for up to a maximum of eight minutes
  • Press the plunger, slowly letting coffee grounds to seep out of the filtercoffee2

Single Cup Makers

Pre-packaged coffee pods makes single cup. A coffee pod has coffee grounds and a miniature filter in the pack. These makers are easy to clean and maintain and suitable for small households with few coffee lovers. Quick in operation they allow different users to suit their different tastes by using varying coffee flavours in the pods.

  • Hot water is filtered through the coffee pod in the machine slot provided. The action results in a single cup of coffee.1610859_10155017544770251_311638911097950282_n