6. The ventilating fan of the bathroom of a building has a volume flow rate of 30 L/s and runscontinuously. The building is located in San Francisco, California, where the average wintertemperature is 12.2 °C, and is maintained at 22°C at all times. The building is heated byelectricity whose unit cost is $0.09/kWh. Determine the amount and cost of the heat "ventedout" per month in winter. (The gas constant and specific heat of air are R 0.287 kJ/kg-K andCp1.0 kl/kg-K. Consider air at P 1 atm. and T-22 °C)12.2°C30 L/s22°CFanBathroom

Answered: 6. The ventilating fan of the bathroom…

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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Steam flows steadily through a turbine at a rate of 45,000 lbm/h. It enters at 1000 psi and 900°F and leaves at 5 psi as saturated vapor. If the power generated by the turbine is 4 MW, determine the rate of heat loss from the steam.
Water is stored in a large, well-insulated storage tank at 21.0°C open to atmosphere. It is pumped at a rate of 40 m3/h to another tank 25 m above, which is also open to atmosphere. The motor driving the pump supplies energy at the rate of 9.5 kW. The water passes through a heat exchanger where 255 kW of heat is added to the water. The total friction loss (ΣF) in the system is 90.25 J/kg. Determine the final temperature of the water at the second tank
Why is it important to clean the condenser coils of a household refrigerator a few times a year? Also, why is it important not to block airflow through the condenser coils?
A steady-flow thermodynamic system receives 100 lb/min of fluid at 30 psia and 200 Fahrenheit and discharges it from a point 80 ft above the entrance section at 150 psia and 600 Fahrenheit. The fluid enters with velocity of 1200 fpm and leaves with a velocity of 200 fpm. During this process, there are supplied 25,000 Btu/hr of heat from an external source and the increase in enthalpy is 2 Btu/lb. Determine the work done in horsepower.
Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel. During the process, 34.59 kJ of heat is transferred to the water, and 8.01 kJ of heat is lost to the surrounding air. The paddle-wheel work amounts to 540.56 N ∙ m. Determine the final energy of the system if its initial internal energy is 11.95 kJ.
A steam power plant is located in the northern part of the country. Steam in the plant flows steadily through a 0.17-m diameter pipeline from the steam generating unit (SGU) to the steam turbine. At the SGU end, the steam conditions are determined to be P = 4 MPa, t = 400°C, h = 3,247 kJ/kg, and specific volume = 0.181 m³/kg. At the steam turbine end, the conditions are found to be P = 3.5 MPa, t = 392°C, h = 3,178.3 kJ kg, and specific volume = 0.248 m³/kg. Heat loss from the pipeline is 7.86 kJ/kg. Determine the steam mass flow rate in kg/s.
A steam power plant is located in the northern part of the country. Steam in the plant flows steadily through a 0.162-m diameter pipeline from the steam generating unit (SGU) to the steam turbine. At the SGU end, the steam conditions are determined to be P = 4 MPa, t = 400°C, h = 3,235.1 kJ/kg, and specific volume = 0.118 m³/kg. At the steam turbine end, the conditions are found to be P = 3.5 MPa, t = 392°C, h = 3,109.4 kJ kg, and specific volume = 0.231 m³/kg. Heat loss from the pipeline is 6.80 kJ/kg. Determine the steam mass flow rate in kg/s.
Ammonia refrigerant circulates in a refrigeration system with one compressor serving two evaporators where one evaporator carries a load of 35 kW at 10°C and the other a load of 70 kW at -5°C. A back pressure valve reduces the pressure in the 10°C evaporator to that of the -5°C evaporator. The condensing temperature is 37°C. Calculate the mass of the refrigerant in kg/s. (Use h₂ = h1 + 203.7586 kJ/kg)
A room measures 4mx7mx5m and the air in it has to be always kept 20 C0 lower than that of the incoming air. The air inside has to be renewed every 30 minutes. Assuming 75% efficiency, calculate the HP rating of an air-conditioning unit suitable for this purpose. Take specific heat of air as 0.24 and its density as 1.27 kg/m^3.
Determine the work required (in kJ/kg) for a pump that is used to increase the pressure of a liquid water stream from 100 kPa to 1500 kPa isothermally at 20 °C. The specific heat of water (C) is 0.0035 kJ/kg.K. its specific volume is 0.001031 m³/kg and its volume expansivity (B) is 250x10 K
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A turbine receives steam at 2778.1 kJ/kg enthalpy and then converts it to shaft work. The steam leaves the turbine with 1200 kJ/kg enthalpy. Assuming no losses due to gravity, heat, and friction, determine the power produced in kW if 5 kg/s of steam flows at the inlet

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