At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how many kilogram of water are needed per kilogram of steam ? Ignore the pressure change in steam.

1. 👍 0
2. 👎 0
3. 👁 92
1. Q(gained) =Q(lost)
Q(gained) =Q₁+Q₂+Q₃
Q₁ = c₁m(Δt₁)=2020•1•(120-100) = 40400 J
Q₂ = Lm=2256000•1= 2256000 J
Q₃=c₂m(Δt₂)=4186•1•(100-85) = 62790 J
Q(gained) =40400 +2256000+62790 =2359190 J
Q(lost) =c₂•M•(Δt₃)=4186•M•(19-8) = 4186•11•M
M= Q(gained)/ 4186•11=2359190/4186•11= 51.2 kg

1. 👍 0
2. 👎 0
posted by Elena
2. Can you please explain it to me...that what's happening in all the process?

1. 👍 0
2. 👎 0
3. Q(gained) =Q(lost)
Q(lost) =Q₁+Q₂+Q₃
Q₁ = c₁m(Δt₁)=2020•1•(120-100) = 40400 J
Q₂ = Lm=2256000•1= 2256000 J
Q₃=c₂m(Δt₂)=4186•1•(100-85) = 62790 J
Q(lost) =40400 +2256000+62790 =2359190 J
Q(gained) =c₂•M•(Δt₃)=4186•M•(19-8) = 4186•11•M
M= Q(lost)/ 4186•11=2359190/4186•11= 51.2 kg
The processes in which there is a loss of energy :
steam cooling up to 100⁰ (Q₁), ‘steam-water’ transformation (Q₂), and water cooling up to 85⁰ (Q₃)
This energy heat the water from the lake from 8⁰ to 19⁰ (Q(gained))

1. 👍 0
2. 👎 0
posted by Elena

## Similar Questions

1. ### science help PLS

A nuclear power plant produces huge amount of electricity. However, it dumps radioactive wastes into the sea. This has led to an increase in illness among people living along the coast. Which of these is the best method to solve

asked by Oscar on April 12, 2016
2. ### Physics

At a nuclear power plant, water at 6degress Celius from a nearby lake is used in a heat exchange to condense spent steam at a temperature of 115 degees C to water at 80 degrees C. If the cooling water returns to the lake at a

asked by alex on April 20, 2017
3. ### physics

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at

asked by Riana on March 31, 2013
4. ### physics

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at

asked by Riana on March 31, 2013
5. ### PHYSICS

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at

asked by Riana on March 31, 2013
6. ### physic

In a serious accident, a nuclear power plant's reactor vessel cracks, and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat

asked by joseph on May 6, 2014
7. ### Science

How does a nuclear power plant produce energy? A. Through solar panels B. Through nuclear fission reactions C. Through geothermal heat D. Through nuclear meltdown reactions I am not really sure what the answer is but I am

asked by Jessica on April 13, 2017
8. ### intro of my essay

Nuclear power plants have been a controversy issue in our world for many years and it will continue to be so in the years to come. The issue of whether people should or shouldn’t accept power plants to be operated has been

asked by julie on October 30, 2007
9. ### quantum physics

A nuclear reactor generating plant supplies 53.0 MW of useful power steadily for a year. Assuming that, in addition, twice this power is wasted in heat production, determine the mass (in kilograms) converted to energy in a year at

asked by Ryan on April 13, 2012
10. ### Physics

A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 31%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in

asked by Stefan on December 4, 2010

More Similar Questions