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The rate of flow of air arising due to the difference in temperature of outside and inside is given by the expression ____________ ½ b) Q = 320 C.A. x h(T-t) c) Q = 640 C.A. ½ d) Q = 640 C.A. x h(T-t)

Correct Answer: h(T-t)
The rate of flow of air arising due to the difference in temperature of outside and inside is given by the expression Q = 640 C.A. ½. Here, C stands for coefficient of effectiveness, Q is the rate of air flow in m3/h, A is the free area of the inlet opening, h is the vertical height difference between inlet and outlet, T is the average temperature of inside air and t is the average temperature of outside air in degree Celcius.

In the expression for finding the rate of flow of air arising due to the difference in temperature of outside and inside, the coefficient of effectiveness for general conditions is taken as ___________

Ventilation arising from the temperature difference between outside and inside takes place due to ____________ effect.

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

On a winter day with atmospheric air at −15°C, the outside front wind-shield of a car has surface temperature of +2°C, maintained by blowing hot air on the inside surface. If the wind-shield is 0.5 m2 and the outside convection coefficient is 250 W/Km2, find the rate of energy loss through front wind-shield.

A hollow sphere (k = 30 W/m K) of inner radius 6 cm and outside radius 8 cm has a heat generation rate of 4000000 W/m3. The inside surface is insulated and heat is removed by convection over the outside surface by a fluid at 100 degree Celsius with surface conductance 300 W/m2 K. Make calculations for the temperature at the outside surfaces of the sphere

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16 m is 10 W/m2. The temperature of the inside wall is -5°C. The outside wall temperature is

Suppose saturated polar air has an air temperature and dew point of -10o C, and unsaturated desert air has an air temperature of 35o C and a dew point of 10o C. The desert air contains ______ water vapour and has a ________ relative humidity than the polar air.

The process in which the difference of temperature between the outside air and the inside air tends to the deposition of moisture on the room surfaces is known as ____________

Consider a system where a wall of a tank containing a hot liquid at a temperature T0, with an air stream of temperature T∞ flows on the outside of the tank, maintaining the outside wall temperature of TL. What is the expression for boundary condition of the system?

A spherical vessel of 0.5 m outside diameter is insulated with 0.2 m thickness of insulation of thermal conductivity 0.04 W/m degree. The surface temperature of the vessel is – 195 degree Celsius and outside air is at 10 degree Celsius. Determine heat flow per m2 based on inside area