subject
Engineering, 24.10.2019 18:43 kathleensumter4913

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.

ansver
Answers: 3

Another question on Engineering

question
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
question
Engineering, 04.07.2019 19:10
A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.
Answers: 3
question
Engineering, 04.07.2019 19:20
Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3
Answers: 2
question
Engineering, 05.07.2019 10:10
What is the correct way to measure the overall length of a boat? measure from the tip of the bow to the highest point on the gunwale. measure from the tip of the bow in a straight line to the stern of the boat. measure from the tip of the bow in a straight line to the back seat. measure from port to starboard at the boat's widest point.
Answers: 1
You know the right answer?
A4-m × 5-m × 7-m room is heated by the radiator of a steam-heating system. the steam radiator transf...
Questions
Questions on the website: 13722367