The heating element of a water heater in an apartment building has a maximum power output...
The heating element of a water heater in an apartment building
has a maximum power output of 26 kW. Four residents of the building
take showers at the same time, and each receives heated water at a
volume flow rate of 15x10-5 m3/s. If the
water going into the heater has a temperature of 10°C, what is the
maximum possible temperature of the hot water that each showering
resident receives?
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The heating element of a water heater in an apartment building
has a maximum power output...
The heating element of a water heater in an apartment building has a maximum power output...
The heating element of a water heater in an apartment building has a maximum power output of 27 kW. Four residents of the building take showers at the same time, and each receives heated water at a volume flow rate of 12x10-5 m3/s. If the water going into the heater has a temperature of 20°C, what is the maximum possible temperature of the hot water that each showering resident receives?
A typical electric water heater has a heating element rated at 4500 Watts and is connected...
A typical electric water heater has a heating element rated at 4500 Watts and is connected across a 240 Volt power source. When operated normally, find the resistance of the heating element, the current drawn by the heating element, and the cost of heating water for 45.0 minutes. Assume electricity costs $.10/kw * hr
Hot Water Heater Due in 7 hours, 27 minutes A family comes home from a long...
Hot Water Heater Due in 7 hours, 27 minutes A family comes home from a long vacation with laundry to do and showers to take. The water heater has been turned off during vacation. If the water heater has a capacity of 51.8 gallons and a 4610 W heating element, how much time is required to raise the temperature of the water from 22.0°C to 64.9°C? Assume that the heater is well insulated and no water is withdrawn from the...
3. a) An electric water heater uses 5500 W (240 V) of electrical power. It has...
3. a) An electric water heater uses 5500 W (240 V) of electrical power. It has a capacity of 40 gallons (150 liters or 150 kg). If the initial temperature of the water in the water heater is 20° C, how long will it take to heat the water to a final temperature of 60° C at 100% efficiency? b) How long will it take to heat the water to a final temperature of 60°C at 80% efficiency? c)If electrical...
37. A continuous flow water heater (geyser) has an electrical power rating 2 kW and efficienty...
37. A continuous flow water heater (geyser) has an electrical power rating 2 kW and efficienty of conversion of electrical power into heat-80%. If water is flowing through the device at the rate of 100 cc/sec, and the inlet temperature is 10°C, the outlet temperature will be (1) 12.2°C (3) 20°C (2) 13.8°C (4) 16.5°C
An engineer is developing an electric water heater to provide acontinuous ("on demand") supply of hot...
An engineer is developing an
electric water heater to provide acontinuous ("on demand") supply
of hot water. One trial design isshown in the figure. Water is
flowing at the rate F, the inlet thermometer registers
T_1, the voltmeter reads V, and the ammeter reads current I. Then
the power (i.e., the heat generated perunit time by the heating
element) is VI.
Assume that the heat capacity of water is C and that the heat
capacity of the heater apparatus is...
SME 4463/SKMM 3443 Q3. (a) Water is heated from 15oC to 75°C as it flows through...
SME 4463/SKMM 3443 Q3. (a) Water is heated from 15oC to 75°C as it flows through a 2.5-cm-internal-diameter, 15-m long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady state operation all the heat generated in the heater is transferred to the water in the tube. If the system is to provide hot water at a...
A small workboat is fitted with a diesel engine that develops its maximum power of 300...
A small workboat is fitted with a diesel engine that develops its maximum power of 300 kW with a corresponding specific fuel consumption of 0.21 kg/kW h. At maximum power, the air-fuel ratio of the engine is 20 and the exhaust pressure is 1.01 bar. It is proposed to provide hot water for the vessel by using a shell and tube heat exchanger to extract waste heat from the engine exhaust gases. Calculate the: (i) tube length required. The following...
2) A hottub Contains 450 gal of water at 68°F The heating element has 5.0kw power...
2) A hottub Contains 450 gal of water at 68°F The heating element has 5.0kw power (ie, it delivers 5k) heat energy! per Second). How many hours does it take to heat the hottub to 104°F?
Water is the working fluid in an ideal regenerative Rankine cycle with one open feed water heater, Figure 2. Upstream of the high pressure turbine superheated vapour with a mass flow rate of 90 kg/s...
Water is the working fluid in an ideal regenerative Rankine cycle with one open feed water heater, Figure 2. Upstream of the high pressure turbine superheated vapour with a mass flow rate of 90 kg/s entres the first-stage turbine at a pressure of 14 MPa Each turbine stage has an isentropic efficiency of 90%. The temperature of the inlet vapour is 520°C. The steam expands through the first-stage turbine to a pressure of 0.9MPa where some of the steam is...
A typical electric water heater has a heating element rated at 4500 Watts and is connected across a 240 Volt power source. When operated normally, find the resistance of the heating element, the current drawn by the heating element, and the cost of heating water for 45.0 minutes. Assume electricity costs $.10/kw * hr
Hot Water Heater Due in 7 hours, 27 minutes A family comes home from a long vacation with laundry to do and showers to take. The water heater has been turned off during vacation. If the water heater has a capacity of 51.8 gallons and a 4610 W heating element, how much time is required to raise the temperature of the water from 22.0°C to 64.9°C? Assume that the heater is well insulated and no water is withdrawn from the...
3. a) An electric water heater uses 5500 W (240 V) of electrical power. It has a capacity of 40 gallons (150 liters or 150 kg). If the initial temperature of the water in the water heater is 20° C, how long will it take to heat the water to a final temperature of 60° C at 100% efficiency? b) How long will it take to heat the water to a final temperature of 60°C at 80% efficiency? c)If electrical...
37. A continuous flow water heater (geyser) has an electrical power rating 2 kW and efficienty of conversion of electrical power into heat-80%. If water is flowing through the device at the rate of 100 cc/sec, and the inlet temperature is 10°C, the outlet temperature will be (1) 12.2°C (3) 20°C (2) 13.8°C (4) 16.5°C
An engineer is developing an
electric water heater to provide acontinuous ("on demand") supply
of hot water. One trial design isshown in the figure. Water is
flowing at the rate F, the inlet thermometer registers
T_1, the voltmeter reads V, and the ammeter reads current I. Then
the power (i.e., the heat generated perunit time by the heating
element) is VI.
Assume that the heat capacity of water is C and that the heat
capacity of the heater apparatus is...
SME 4463/SKMM 3443 Q3. (a) Water is heated from 15oC to 75°C as it flows through a 2.5-cm-internal-diameter, 15-m long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady state operation all the heat generated in the heater is transferred to the water in the tube. If the system is to provide hot water at a...
2) A hottub Contains 450 gal of water at 68°F The heating element has 5.0kw power (ie, it delivers 5k) heat energy! per Second). How many hours does it take to heat the hottub to 104°F?
Water is the working fluid in an ideal regenerative Rankine cycle with one open feed water heater, Figure 2. Upstream of the high pressure turbine superheated vapour with a mass flow rate of 90 kg/s entres the first-stage turbine at a pressure of 14 MPa Each turbine stage has an isentropic efficiency of 90%. The temperature of the inlet vapour is 520°C. The steam expands through the first-stage turbine to a pressure of 0.9MPa where some of the steam is...
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