A4-m × 5-m × 7-m room is heated by the radiator of a steam-heating system. the steam radiator transfers heat at a rate of 10,000 kj/h, and a 100-w fan is used to distribute the warm air in the room. the rate of heat loss from the room is estimated to be about 5000 kj/h. if the initial temperature of the room air is 10°c, determine how long it will take for the air temperature to rise to 20°c. assume constant specific heats at room temperature.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

The higher the astm grain size number, the finer the gran is. a)-true b)-false