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Chapter 4: 4.7 (page 129)

Why must you put an air conditioner in the window of a building, rather than in the middle of a room?

Short Answer

Expert verified

We must put t an air conditioner in the window to cool the room effectively.

Step by step solution

01

Given

Air condition is put in window.

Explain why?

02

Explanation

An air conditioner works on hot and cold reservoir concept. It considers outside of the house as a hot reservoir and room as a cold reservoir.

It works by extracting heat from room and emitting it outside. It will absorb the heat from a room and will transfer it to outside,when it is placed in a window of the room. In this way, the room will be cooled effectively by the air conditioner.

If we put in the middle of the room then the extracted heat will be thrown back to the same room, so it will not have much cooling effect on the room.

So it must be placed in a window.

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Most popular questions from this chapter

A power plant produces1GWof electricity, at an efficiency of 40%(typical of today's coal-fired plants).

(a) At what rate does this plant expel waste heat into its environment?

(b) Assume first that the cold reservoir for this plant is a river whose flow rate is 100m3/s.By how much will the temperature of the river increase?

(c) To avoid this "thermal pollution" of the river, the plant could instead be cooled by evaporation of river water. (This is more expensive, but in some areas it is environmentally preferable.) At what rate must the water evaporate? What fraction of the river must be evaporated?

Use the definition of enthalpy to calculate the change in enthalpy between points 1 and 2 of the Rankine cycle, for the same numerical parameters as used in the text. Recalculate the efficiency using your corrected value ofH2, and comment on the accuracy of the approximationH2≈H1.

At a power plant that produces 1 GW109 watts) of electricity, the steam turbines take in steam at a temperature of 500o, and the waste heat is expelled into the environment at 20o
(a) What is the maximum possible efficiency of this plant?
(b) Suppose you develop a new material for making pipes and turbines, which allows the maximum steam temperature to be raised to 600o. Roughly how much money can you make in a year by installing your improved hardware, if you sell the additional electricity for 5 cents per kilowatt-hour? (Assume that the amount of fuel consumed at the plant is unchanged.)

Calculate the efficiency of a Rankine cycle that is modified from the parameters used in the text in each of the following three ways (one at a time), and comment briefly on the results:

(a) reduce the maximum temperature to 500oC;

(b) reduce the maximum pressure to 100 bars;

(c) reduce the minimum temperature to 10oC.

Suppose that heat leaks into your kitchen refrigerator at an average rate of 300 watts. Assuming ideal operation, how much power must it draw from the wall?
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