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Chapter 20: Problem 13

Why might a heat pump have an advantage over a space heater that converts electrical energy directly into thermal energy?

Short Answer

Expert verified
Answer: The advantages of a heat pump over a space heater are higher efficiency, lower environmental impact, and reduced running costs.

Step by step solution

01

Understand How a Heat Pump Works

A heat pump works by transferring heat from a cold space to a warmer space, using refrigerant as a medium. The heat pump absorbs heat from the outside environment (even if it is cold) and moves that heat to the inside of a building or space, increasing its temperature. The heat pump does not actually create heat but moves it from one location to another.
02

Understand How a Space Heater Works

A space heater operates differently. It converts electrical energy directly into thermal energy through an internal process. The space heater emits this thermal energy into the surrounding space, warming it up. Although space heaters are easy to install and use, their efficiency is limited by their energy conversion process.
03

Compare Efficiency of Heat Pumps and Space Heaters

The efficiency of a heating system is often measured by its Coefficient of Performance (COP). For a heat pump, COP is the ratio of the heat delivered to the amount of energy consumed. COP values for heat pumps are generally above 1, which means that heat pumps deliver more heat than the energy they consume. On the other hand, the COP of a space heater is limited to 1, as it converts all the input energy into thermal energy, without any extra gain.
04

Consider Environmental Impact

One of the advantages of a heat pump is that it has a lower environmental impact compared to a space heater, especially if the electricity used for the space heater comes from non-renewable sources. Since the heat pump moves existing heat from one place to another instead of creating heat, it consumes less energy overall, reducing greenhouse gas emissions and contributing to a cleaner environment.
05

Evaluate Running Costs

The running costs of a heating system are another important aspect to consider. Due to their higher efficiency, heat pumps generally have lower running costs compared to space heaters. Over time, the difference in running costs can become substantial, providing an economic advantage for heat pump users. In conclusion, a heat pump has advantages over a space heater because of its higher efficiency, lower environmental impact, and reduced running costs. This makes heat pumps a more desirable option for heating a space, even though they may have a higher initial installation cost.

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Most popular questions from this chapter

An outboard motor for a boat is cooled by lake water at \(15.0^{\circ} \mathrm{C}\) and has a compression ratio of \(10.0 .\) Assume that the air is a diatomic gas. a) Calculate the efficiency of the engine's Otto cycle. b) Using your answer to part (a) and the fact that the efficiency of the Carnot cycle is greater than that of the Otto cycle, estimate the maximum temperature of the engine.

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