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Mechanism of heat transfer01:19

Mechanism of heat transfer

1.3K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.3K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

399
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
399
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.4K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.4K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.4K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.4K
Heat Capacity: Problem-Solving01:17

Heat Capacity: Problem-Solving

561
The heat capacity of a gas is the amount of heat energy required to raise the temperature of a unit mass of gas by one degree Celsius. It is an important thermodynamic property of gases, and its determination is essential in many industrial and scientific applications. Here are the steps to solve problems related to the heat capacities of gases:
Determine the type of gas: The heat capacity of a gas depends on its molecular structure and the degree of freedom of its molecules. Different types of...
561
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

1.2K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.2K

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Related Experiment Video

Updated: Aug 10, 2025

Design and Optimization Strategies of a High-Performance Vented Box
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Design and Optimization Strategies of a High-Performance Vented Box

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Optimization of Hexagonal Structure for Enhancing Heat Transfer in Storage System.

Natalia Raźny1, Anna Dmitruk1, Artur Nemś2

  • 1Department of Lightweight Elements Engineering, Foundry and Automation, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.

Materials (Basel, Switzerland)
|February 11, 2023
PubMed
Summary

This study enhanced thermal energy storage using salt mixtures with aluminum honeycomb structures. These structures improved heat transfer during charging and discharging cycles, showing better performance than pure phase change material beds.

Keywords:
PCMheat storageheat transferhoneycombmetal structuresspatial structures

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Area of Science:

  • Materials Science
  • Thermal Engineering
  • Energy Storage

Background:

  • Latent heat storage systems are crucial for thermal energy management.
  • Phase change materials (PCMs) like KNO3 and NaNO3 mixtures offer high energy storage density.
  • Efficient heat transfer is a key challenge for PCM system performance.

Purpose of the Study:

  • To investigate the thermal performance of latent heat storage systems using a KNO3/NaNO3 salt mixture.
  • To enhance heat transfer by incorporating 3D printed, investment-cast aluminum honeycomb structures.
  • To evaluate the impact of different wall thicknesses on system performance through experimental testing and numerical simulation.

Main Methods:

  • Fabrication of aluminum honeycomb structures using 3D printing and investment casting.
  • Experimental testing of latent heat storage system performance with and without enhancers.
  • Numerical simulation using ANSYS Fluent to analyze heat transfer characteristics for various wall thicknesses (0.8-2.0 mm).

Main Results:

  • Honeycomb structures significantly improved charging and discharging rates compared to a pure PCM bed.
  • Thicker walls (up to 2.0 mm) led to reduced temperature change rates (dT/dt) and improved heat distribution.
  • Investment casting produced complex, defect-free aluminum structures.

Conclusions:

  • Aluminum honeycomb enhancers effectively improve the thermal performance of KNO3/NaNO3 latent heat storage systems.
  • Optimizing wall thickness of enhancers is critical for efficient thermal management.
  • Advanced manufacturing techniques like 3D printing and investment casting are suitable for creating high-performance heat transfer enhancers.