A flow-through electric water heater has a 22 kW electric heater inside an insulated 2.0-cm-diameter pipe so that water flowing through the pipe will have good thermal contact with the heater. Assume that all the heat energy is transferred to the water. Suppose the inlet water temperature is 12° C and the flow rate is 8.0 L/min (about that of a standard shower head).

A flow-through electric water heater has a 22 kW electric heater inside an insulated 2.0-cm-diameter pipe so that water flowing through the pipe will have good thermal contact with the heater. Assume that all the heat energy is transferred to the water. Suppose the inlet water temperature is 12° C and the flow rate is 8.0 L/min (about that of a standard shower head).

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

See similar textbooks

Similar questions

Steam is supplied to a fully loaded 100 hp turbine at 200 psia with u1 = 1160BTU/lb, V1 = 2.6 ft3/lb and v1 = 380 ft/s. Exhaust is at 1.1 psia with U2 = 900 BTU/lb., V2 = 1200 ft/s. The heat loss from the steam in the turbine is 10.5 BTU.Ib.Neglect the potential energy change and determine:a.the work per lb steamb. the steam flow rate in Ib/hour
A gasoline engine is 30% efficient, which means it can transfer 30% of the energy heat provides the engine with useful success. If the engine consumes 0.8 L/h of gasoline with consumption index 3.5·104 kJ/L, find the amount of work done in kW and horsepower (hp)
Consider a condensing heat exchanger operating with two separate fluids, R-134a and the water. Assuming the operating conditions listed in the table below, and that the pressure drop of the fluids are negligible, find the mass flowrate of the water (kg/s) and Q (kW) transferred between the R-134a and the water. m Enters Exits Fluid Water ? Liquid at T₁ = 5 °℃ Liquid at T₂ = 25 °℃ T2 = 35 °C R-134a 10 kg/min P₁ = 1 MPa and T₁ = 70 °C
The ice maker inside a refrigerator makes ice cubes at 0.0°C from water that is at 17.2°C when it first enters the ice maker. If this machine is rated at 184 W and has a 2.96 coefficient of performance, what is the maximum amount of ice it can produce in a 24 hour period without any interruption or stoppage? Assume that the ice maker works just like a refrigerator. The specific heat of water is 4184 J/(kg · °C), and the latent heat of fusion of ice is 33.4 ✕ 104 J/kg.
In the system shown in the figure, saturated liquid water at 12 MPa pressure enters the boiler at a flow rate of 45 kg / h. Heat is transferred from a heat source at 650 ° C to the water in the boiler at constant pressure, and superheated steam at 450 ° C temperature is obtained. The steam in the form of superheated steam then expands adiabatically in the turbine and comes out as saturated steam at 50 kPa pressure. a) Show the operations on the T (° C) -s (kJ / kgK) diagram. b) Find the isentropic efficiency and power of the steam turbine. c) Find the total entropy generation by calculating the entropy productions in the boiler and the turbine.
If you steal your solution from another website I will report you
Steam 90°C 10. A shell-and-tube process heater is to be selected to heat water (Cp = 4190 J/kg-°C) from 20°C to 90°C by steam flowing on the shell side. The heat transfer load of the heater is 600 kW. If the inner diameter of the tubes is 1 cm and the velocity of water is not to exceed 3 m/s, determine how many tubes need to be used in the heat exchanger. 20°C Water
A centrifugal pump compresses 3000 liters/min of water from 98 kPa to 300 kPa. The inlet and outlet temperatures are 25°C. The inlet and discharge piping are on the same level, but the diameter of the inlet piping is 15 cm, whereas that of the discharge piping is 10 cm. Determine the pump power in kilowatts.
Find out the work-input (work required) of a compressor if COP of the refrigerating machine is 4.5 and cooling effect is 12KW.
Heat exchangers exchange only heat and not mass (fluid does not mix).The working fluid is water vapor that comes from a boiler and serves to heat cold water.Suppose that in this hypothetical application above, the water vapor enters at 500 kPa and 300 °C through the “pipe inlet” (see figure) and so is used to heat the cold water, which enters in the opposite direction through the “hull inlet” ” at 15 °C and goes to the “hull exit” exiting at 75 °C. How much steam per kg of liquid water is needed as long as the steam does not condense?
A compressor is fed with superheated steam at 300°C and 20 bar. The compressor inlet speed is 20 m/s and the internal diameter is 0.1 m. The discharge tube, after the compressor, with a smaller diameter is 170 m/s. Compressor output is superheated steam at 300°C and 20 bar. The heat loss from the compressor to the surroundings is 5 kW. Determine the work generated by the compressor in hp.
Define the energy equation of a uniformflow system reduces to that of a closed system when all the inlets and exits are closed.