A drift has a fissure water inflow of 2 l / s ( = 2 kg...
A drift has a fissure water inflow of 2 l / s ( = 2 kg / s) at 50 °C, and the water in the ditch leaving the drift has cooled off to 32 °C. What is the heat added to the air?
Homework Answers
Question #2 10 marks) A heat engine that uses water as the working fluid is being...
Question #2 10 marks) A heat engine that uses water as the working fluid is being used to produce power in a certain location. The condenser of the heat engine is being cooled by drawing 200 kg/s of water from a nearby lake at 25°C and discharging it at 50°C. The thermal efficiency of the heat engine is 40%. Furnace Boiler Condenser 25°C | water from lake 200 kg/s V 50°C water returned to the lake Calculate: i) The amount...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat exchanger heats air which flows on the shell side. The tubes are bras with outside diameter of 2.6 cm and are 6.7m long. The heat transfer coefficients on the inside and outside tube surfaces are 470 W/m2K and 210 W/m2K, respectively. Air enters the unit at 15°C with a flow rate of 16 kg/s. The entering water temperature is 350K. A) Draw and label...
A bituminous coal is burned with air in a boiler furnace. The coal is fed at a rate of 40000 kg/h and has an ultimate analysis of 76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt% non-...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
3. The air in a building is to be maintained at 25°C and 55% relative humidity...
3. The air in a building is to be maintained at 25°C and 55% relative humidity by passing outside air through a water spray. The air enters the spray chamber at 32°C and 70% relative humidity, leaves the chamber cooled and saturated with water vapor, and is then reheated to 25°C. Estimate the temperature of the air leaving the spray chamber and the water (kg) added to or removed from (specify which) each kilogram of dry air processed
Atmospheric air at 32°C and 70% relative humidity passes through a cooling section in an air-conditioning...
Atmospheric air at 32°C and 70% relative humidity passes through a cooling section in an air-conditioning duct where the air is cooled below its dew point and some of the water is removed. The air then passes over a heating section where heat is added until the final temperature is 22°C and the relative humidity is 45%. Assume the process occurs at constant pressure of 1 atm. Using the psychrometric chart, determine: (a) The amount of water removed in the...
2.- Hot oil (Cp = 2200 J/kg °C) is to be cooled by water (Cp =...
2.- Hot oil (Cp = 2200 J/kg °C) is to be cooled by water (Cp = 4180 J/kg °C) in a 2-shell-passes and 12-tube-passes heat exchanger. The tubes are thin-walled and are made of copper with a diameter of 1.8 cm. The length of each tube pass in the heat exchanger is 3 m. Water flows through the tubes at a total rate of 0.1 kg/s, and the oil through the shell at a rate of 0.2 kg/s. The water...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by injecting liquid water into the air leaving the low pressure compressor. The intercooler in the sketch provides cooling partly by cold water injection and partly by heat transfer to the surroundings. A steady flow of air enters 1 mw the compressor at T = 20°C, P = 100 kPa and a relative humidity compressor intercooler of o. = 50% at a flow rate of...
1.6.53m/s B.4.96m/s C. 1.48 m/s D.3.48m is IV 2 2 kg 3 kg ) of ice...
1.6.53m/s B.4.96m/s C. 1.48 m/s D.3.48m is IV 2 2 kg 3 kg ) of ice is in 3 of water (Lf= 33.5+ 10 J/kg Cwater=4186 J/kg. K0°C). The heat in megajoules (MI) that must be added to convert the entire sample to water at 50°C is: A.1.047 MJ B. 1.72 MJ C. 0.67 MJ D.O.628M J 2 A bullet (m=0.04 kg) with a Velocity of 285 m/s hitsa block (M = 2.3kg ) that is initially at rest. The...
2 An average human has about 67 % water by mass. A 75.0 kg person suffering...
2 An average human has about 67 % water by mass. A 75.0 kg person suffering from hypothermia has a body water temperature of 33.5°C and needs to raise this to the normal body temperature of 37.0°C. a) How many grams of sucrose, C12H22O11(s), must be metabolized (use this as a simple combustion reaction with gaseous oxygen, producing liquid water and gaseous carbon dioxide)? 1 4 a) 4.74y lb g sucrose b) What volume of air (L) with a l...
Question #2 10 marks) A heat engine that uses water as the working fluid is being used to produce power in a certain location. The condenser of the heat engine is being cooled by drawing 200 kg/s of water from a nearby lake at 25°C and discharging it at 50°C. The thermal efficiency of the heat engine is 40%. Furnace Boiler Condenser 25°C | water from lake 200 kg/s V 50°C water returned to the lake Calculate: i) The amount...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat exchanger heats air which flows on the shell side. The tubes are bras with outside diameter of 2.6 cm and are 6.7m long. The heat transfer coefficients on the inside and outside tube surfaces are 470 W/m2K and 210 W/m2K, respectively. Air enters the unit at 15°C with a flow rate of 16 kg/s. The entering water temperature is 350K. A) Draw and label...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
3. The air in a building is to be maintained at 25°C and 55% relative humidity by passing outside air through a water spray. The air enters the spray chamber at 32°C and 70% relative humidity, leaves the chamber cooled and saturated with water vapor, and is then reheated to 25°C. Estimate the temperature of the air leaving the spray chamber and the water (kg) added to or removed from (specify which) each kilogram of dry air processed
2.- Hot oil (Cp = 2200 J/kg °C) is to be cooled by water (Cp = 4180 J/kg °C) in a 2-shell-passes and 12-tube-passes heat exchanger. The tubes are thin-walled and are made of copper with a diameter of 1.8 cm. The length of each tube pass in the heat exchanger is 3 m. Water flows through the tubes at a total rate of 0.1 kg/s, and the oil through the shell at a rate of 0.2 kg/s. The water...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by injecting liquid water into the air leaving the low pressure compressor. The intercooler in the sketch provides cooling partly by cold water injection and partly by heat transfer to the surroundings. A steady flow of air enters 1 mw the compressor at T = 20°C, P = 100 kPa and a relative humidity compressor intercooler of o. = 50% at a flow rate of...
1.6.53m/s B.4.96m/s C. 1.48 m/s D.3.48m is IV 2 2 kg 3 kg ) of ice is in 3 of water (Lf= 33.5+ 10 J/kg Cwater=4186 J/kg. K0°C). The heat in megajoules (MI) that must be added to convert the entire sample to water at 50°C is: A.1.047 MJ B. 1.72 MJ C. 0.67 MJ D.O.628M J 2 A bullet (m=0.04 kg) with a Velocity of 285 m/s hitsa block (M = 2.3kg ) that is initially at rest. The...
2 An average human has about 67 % water by mass. A 75.0 kg person suffering from hypothermia has a body water temperature of 33.5°C and needs to raise this to the normal body temperature of 37.0°C. a) How many grams of sucrose, C12H22O11(s), must be metabolized (use this as a simple combustion reaction with gaseous oxygen, producing liquid water and gaseous carbon dioxide)? 1 4 a) 4.74y lb g sucrose b) What volume of air (L) with a l...
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