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Chapter 2: Problem 22

A room is heated as a result of solar radiation coming in through the windows. Is this a heat or work interaction for the room?

Short Answer

Expert verified
Answer: The solar radiation entering the room through the windows should be considered as a heat interaction, as it causes a change in temperature within the room without causing a force to act on the room.

Step by step solution

01

Define Heat and Work Interaction

Heat interaction refers to the transfer of energy between two systems due to a temperature difference. Heat transfer can occur through conduction, convection, or radiation. Work interaction refers to a transfer of energy between a system and its surroundings due to a force acting on the system, causing it to move or change shape.
02

Analyze the Situation

In the given scenario, solar radiation passes through the windows and enters the room, warming it up. We need to identify if this is a result of a temperature difference or if it is due to a force causing movement or change in the room's shape.
03

Identify the Interaction

The solar radiation entering the room through the windows is causing a change in temperature within the room, not causing a force to act on the room. Therefore, the interaction can be categorized as a heat interaction, rather than a work interaction.

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Most popular questions from this chapter

Heat is transferred steadily through a \(0.2-\mathrm{m}\) thick \(8 \mathrm{m} \times 4 \mathrm{m}\) wall at a rate of \(2.4 \mathrm{kW}\). The inner and outer surface temperatures of the wall are measured to be \(15^{\circ} \mathrm{C}\) and \(5^{\circ} \mathrm{C} .\) The average thermal conductivity of the wall is \((a) 0.002 \mathrm{W} / \mathrm{m} \cdot^{\circ} \mathrm{C}\) \((b)0.75 \mathrm{W} / \mathrm{m} \cdot^{\circ} \mathrm{C}\) \((c) 1.0 \mathrm{W} / \mathrm{m} \cdot^{\circ} \mathrm{C}\) \((d) 1.5 \mathrm{W} / \mathrm{m} \cdot^{\circ} \mathrm{C}\) \((e) 3.0 \mathrm{W} / \mathrm{m} \cdot^{\circ} \mathrm{C}\)

The energy contents, unit costs, and typical conversion efficiencies of various energy sources for use in water heaters are given as follows: 1025 Btu/ft's \(\$ 0.012 / \mathrm{ft}^{3},\) and 85 percent for natural gas; \(138,700 \mathrm{Btu} / \mathrm{gal}\) \(\$ 2.2 /\) gal, and 75 percent for heating oil; and \(1 \mathrm{kWh} / \mathrm{kWh}\) \(\$ 0.11 / \mathrm{kWh},\) and 90 percent for electric heaters, respectively. Determine the lowest-cost energy source for water heaters.

A 50 -cm-long, 0.2 -cm-diameter electric resistance wire submerged in water is used to determine the boiling heat transfer coefficient in water at 1 atm experimentally. The surface temperature of the wire is measured to be \(130^{\circ} \mathrm{C}\) when a wattmeter indicates the electric power consumption to be 4.1 \(\mathrm{kW}\). Then the heat transfer coefficient is \((a) 43,500 \mathrm{W} / \mathrm{m}^{2} \cdot^{\circ} \mathrm{C}\) \((b) 137 \mathrm{W} / \mathrm{m}^{2} \cdot^{\circ} \mathrm{C}\) \((c) 68,330 \mathrm{W} / \mathrm{m}^{2} \cdot^{\circ} \mathrm{C}\) \((d) 10,038 \mathrm{W} / \mathrm{m}^{2} \cdot^{\circ} \mathrm{C}\) \((e) 37,540 \mathrm{W} / \mathrm{m}^{2} \cdot^{\circ} \mathrm{C}\)

Conduct a literature survey that reviews that concepts of thermal pollution and its current state of the art.

An insulated room is heated by burning candles. Is this a heat or work interaction? Take the entire room, including the candles, as the system.
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