Related questions
1. How does forced convection differ from natural convection?
2. We often turn the fan on in summer to help us cool. Explain how a fan makes us feel cooler in the summer. Also explain why some people use ceiling fans also in winter.
1. Forced convection is a convective mode of heat transfer in which an external source such as a fan or blower is used to increase the heat transfer coefficient of the working fluid.
Natural convection, on the other end, is a commonly occurring convective mode of heat transfer in which the heat transfer rate depends on mother nature and cannot be altered on our will.
As a fan or blower is introduced in a region executing natural convection, the convective heat transfer coefficient is increased. Hence the heat convected increases proportionally. A boiler with a set of induced and forced draught fans is approximated to be having a heat transfer coefficient of about 50,000 W/m2K.
The inclusion of an external source for increasing heat transfer makes a natural convection an example of forced convection.
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- Explain why convection happens more often in gases and liquids than solids.arrow_forwardHow does a fin enhance heat transfer at a surface?arrow_forwardCalculate the temperature in an unheated space (Tunc) adjacent to a conditioned room with three (3) common surface areas of 175-ft2, 190-ft2, and 210-ft² with an overall heat transfer coefficient of 0.21, 0.27, and 0.32 Btu/h-Ft2 °F, respectively. The surface areas of the unheated space exposed to the outdoors are 175-ft² and 210-ft² with corresponding overall heat transfer coefficients of 0.21 and 0.40 Btu/h- Ft².°F. The sixth (6th) surface is on the ground and can be neglected for this example as can be the effect of any outdoor air entering the space. Inside & outside design reference temperatures are 70°F & -10°F, respectively. Tunc = 37°F Tunc = 36°F Tunc = 30°F Tunc = 35°Farrow_forward
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