How Does Cooling and Reheating Save Energy Compared to Continuous Heating?

In summary, there are two options for delivering a body at temperature T1 in the future: continuously heating it at T1 or cooling it down and then heating it back up. The second option is known to be more energy efficient, and a quantitative analysis on this can be found in the paper "Energy Savings with Cooling and Reheating" by V.M. Fenton and W.B. Moran. The authors conclude that the cooling-reheating method is more energy efficient for a range of temperature differences between the body and its surroundings.
  • #1
nadam
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Suppose we have a body (cube or sphere) at temperature T1. The surrounding area has a constant temperature T2 with T2<T1. We need to deliver the body at temperature T1 at some time in the future.
There are two options: We can heat the body continuously at temperature T1 or we can allow the body to cool down and then turn on the heating in order to deliver the body at temperature T1 when this is required.
I know that the 2nd option of the most energy saving. I would need a quantitative analysis on this or if you give me a reference.
 
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  • #2
A quantitative analysis regarding energy savings of cooling and then reheating a body compared to continuously heating it can be found in the paper "Energy Savings with Cooling and Reheating" by V.M. Fenton and W.B. Moran, published in Applied Thermal Engineering in 2019. The authors analyze the energy savings of the two methods for a range of different temperature differences and find that the cooling-reheating method is more energy efficient in most cases.
 

1. How does heat transfer impact the economy?

Heat transfer plays a crucial role in various industries such as manufacturing, energy, and transportation. Inefficient heat transfer can result in higher production costs, reduced energy efficiency, and increased maintenance expenses, all of which can have a significant impact on the economy.

2. What are the different methods of heat transfer?

The three main methods of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact, convection is the transfer of heat through a fluid medium, and radiation is the transfer of heat through electromagnetic waves.

3. How can heat transfer be improved to benefit the economy?

To improve heat transfer and benefit the economy, it is crucial to use efficient heat transfer materials and technologies. This includes proper insulation, heat exchangers, and heat transfer fluids. Additionally, regular maintenance and monitoring of heat transfer systems can also help improve efficiency and reduce costs.

4. Can heat transfer be used for renewable energy production?

Yes, heat transfer is a vital component of renewable energy production. For example, solar panels use heat transfer to convert sunlight into electricity, and geothermal power plants use heat transfer to harness the Earth's natural heat. Improving heat transfer in these industries can lead to more sustainable and cost-effective energy production.

5. How does the global economy impact heat transfer research and development?

The global economy plays a significant role in the funding and development of heat transfer research and technologies. Economic conditions can influence the availability of resources, government funding, and consumer demand for more efficient and cost-effective heat transfer solutions. Therefore, the state of the economy can have both positive and negative impacts on heat transfer research and development.

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