Ahot water heating system has developed length of 200 feet of 1-inch type m tubing. in this circuit there are soldered fittings, also 1 inch in size, as follows: 60 standard 90° ells, 10 standard 45° ells and 4 gate valves. calculate the total equivalent length of the system.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?