Typical European houses have a central heating system
PHYSICS · Multi-part · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
Typical European houses have a central heating system. The system has radiators that are usually made of two sheets of steel of thickness 2 mm. The radiators are 1.0 m long and 0.5 m high. Hot water at a temperature of 60 °C is constantly fed into the radiator by the heating pump.
(1) Calculate the net rate at which energy is radiated by the radiator if the room it is in is at an initial temperature of 20 °C. (Take the emissivity of the radiator to be 0.55.)
(2) Suggest a reason why such radiators are painted white.