Engineering, 24.12.2019 17:31 SoccerHalo
Afuel oil is burned with air in a boiler furnace. the combustion produces 813 kw of thermal energy, of which 65% is transferred as heat to boiler tubes that pass through the furnace. the combustion products pass from the furnace to a stack of 550∘c. water enters the boiler tubes as a liquid at 30∘c and leaves the tubes as saturated steam at 20 bar absolute.
(a) calculate the rate (kg/h) at which steam is produced.
(b) use the steam tables to estimate the volumetric flow rate of the steam produced.
(c) repeat calculation of part (b), only assume ideal-gas behavior instead of using the steam tables. would you have more confidence in the estimate of part (b) or part (c)? explain.
(d) what happened to the 35% of the thermal energy released by the combustion that did not go to produce the steam?
Answers: 3
Engineering, 04.07.2019 18:10
What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.
Answers: 2
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
Answers: 1
Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
Answers: 2
Engineering, 04.07.2019 18:10
Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented
Answers: 2
Afuel oil is burned with air in a boiler furnace. the combustion produces 813 kw of thermal energy,...
Geography, 18.02.2020 01:02
Mathematics, 18.02.2020 01:02
History, 18.02.2020 01:02
Biology, 18.02.2020 01:02
Computers and Technology, 18.02.2020 01:02
Computers and Technology, 18.02.2020 01:02
Mathematics, 18.02.2020 01:02