Data that have to be used for solving the practical examples and the problems: Atmospheric pressure for all problems and practical examples is B = 946 mbar. For all practical examples and problems consider air as ideal and perfect gas. Universal gas constant R₁ = 8314.472 J/(kmol.K). Air ideal gas constant R = 287 J/(kg.K). Atomic weights in kg/kmol: Carbon - 12.0107; Nitrogen - 14.0067; Oxygen - 15.9994. Isentropic exponent: k=1.67 for monatomic gases; k=1.40 for diatomic gases; k=1.29 for polyatomic gases. Wien's displacement constant: b=0.0028977685 m.K. Stefan-Boltzmann constant: σ = 5.6704-108 W/(m²K) Standard state conditions: P=101325 Pa, T.-273.15 K. Problem 1-- Indoor air dry bulb temperature and relative humidity are 23 °C and 45%, respectively. Determine a) the specific humidity (d, kg/kg); b) dew point temperature (tap,°C); c)water vapor mass fraction (Yv, kg/kg); d) dry air mass fraction (Ya, kg/kg). Problem 2- A nozzle receives 38 kg/s of air at a speed of 143 m/s and with an enthalpy of 1080.00 kJ/kg. Air leaves the nozzle with an enthalpy of 740 kJ/kg. Assuming air behaves as ideal gas, determine the exit velocity from the nozzle for a) an adiabatic flow, b) a flow where the heat loss rate is 530 kW. Problem 3- Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp = 2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.
Data that have to be used for solving the practical examples and the problems: Atmospheric pressure for all problems and practical examples is B = 946 mbar. For all practical examples and problems consider air as ideal and perfect gas. Universal gas constant R₁ = 8314.472 J/(kmol.K). Air ideal gas constant R = 287 J/(kg.K). Atomic weights in kg/kmol: Carbon - 12.0107; Nitrogen - 14.0067; Oxygen - 15.9994. Isentropic exponent: k=1.67 for monatomic gases; k=1.40 for diatomic gases; k=1.29 for polyatomic gases. Wien's displacement constant: b=0.0028977685 m.K. Stefan-Boltzmann constant: σ = 5.6704-108 W/(m²K) Standard state conditions: P=101325 Pa, T.-273.15 K. Problem 1-- Indoor air dry bulb temperature and relative humidity are 23 °C and 45%, respectively. Determine a) the specific humidity (d, kg/kg); b) dew point temperature (tap,°C); c)water vapor mass fraction (Yv, kg/kg); d) dry air mass fraction (Ya, kg/kg). Problem 2- A nozzle receives 38 kg/s of air at a speed of 143 m/s and with an enthalpy of 1080.00 kJ/kg. Air leaves the nozzle with an enthalpy of 740 kJ/kg. Assuming air behaves as ideal gas, determine the exit velocity from the nozzle for a) an adiabatic flow, b) a flow where the heat loss rate is 530 kW. Problem 3- Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp = 2.54 kJ/(kg.K), enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
With the data below solve the problems:
Transcribed Image Text:Data that have to be used for solving the practical examples and the problems:
Atmospheric pressure for all problems and practical examples is B = 946 mbar.
For all practical examples and problems consider air as ideal and perfect gas.
Universal gas constant R₁ = 8314.472 J/(kmol.K).
Air ideal gas constant R = 287 J/(kg.K).
Atomic weights in kg/kmol: Carbon - 12.0107; Nitrogen - 14.0067; Oxygen - 15.9994.
Isentropic exponent: k=1.67 for monatomic gases; k=1.40 for diatomic gases; k=1.29 for
polyatomic gases.
Wien's displacement constant: b=0.0028977685 m.K.
Stefan-Boltzmann constant: σ = 5.6704-108 W/(m²K)
Standard state conditions: P=101325 Pa, T.-273.15 K.
Transcribed Image Text:Problem 1--
Indoor air dry bulb temperature and relative humidity are 23 °C and 45%, respectively.
Determine a) the specific humidity (d, kg/kg); b) dew point temperature (tap,°C); c)water vapor
mass fraction (Yv, kg/kg); d) dry air mass fraction (Ya, kg/kg).
Problem 2-
A nozzle receives 38 kg/s of air at a speed of 143 m/s and with an enthalpy of 1080.00 kJ/kg. Air
leaves the nozzle with an enthalpy of 740 kJ/kg. Assuming air behaves as ideal gas, determine the
exit velocity from the nozzle for a) an adiabatic flow, b) a flow where the heat loss rate is 530
kW.
Problem 3-
Crude oil, cp=1.92 kJ/(kg.K), flows at a rate of 0.33 kg/s through the inner pipe of a tube-in-tube
heat exchanger and it is heated from 28 °C to 97 °C. Another hydrocarbon, cp = 2.54 kJ/(kg.K),
enters at 246 °C. The overall coefficient of heat transfer is found to be 4321 W/(m2.K). Determine
for a minimum temperature difference of 20 °C between the hot and cold fluids: a) the LMTD
for parallel flow and for counter-flow heat exchanger; b) the surface area for both heat
exchanger configurations; c) mass flow rate of hot fluid for both heat exchanger configurations.
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