Question

A curtain over a window provides a thermal solution. With your knowledge of the three heat transfer mechanisms describe how a curtain accomplishes its objectives.? (5 pts)

Answer 1

The curtain over a window provides thermal solution as-

The curtain prevents the contact of bulk air in the room and glass of the window to form convection.

From the thermal conductivity data, we know that

Therefore,

As curtains have low thermal conductivity(k) , relatively less heat loss is observed through it.

Also,curtains reflect the radiation heat from the sun and owing to the low value of k, less amount of heat is added to the room air.

The schamtic representation of the given scenario is shown below-

where, Ts,i is the inside temperature of the window

Ts,o is the outside temperature of window

T∞,i is the inside temperature (room)

T∞,o is the outside temperature (atmosphere)

hi is the inside convective heat transfer coefficent

ho is the inside convective heat transfer coefficent