20 Heat Transfer Quizzes, Questions, Answers & Trivia - ProProfs (2024)

FAQs

What are questions about heat transfer? ›

Q = c × m × Δ T

In this case, as we know the mass of the water and its specific heat capacity at the given conditions, we can use the above mentioned formula to calculate the amount of heat to be supplied.

What is Convection? The rising of warm air is how heat (or energy) is transferred throughout our atmosphere. This warm air process is called convection, and the rising of warm air and sinking of cold air is called a convection current.

Heat is the flow of energy from a higher temperature object to a lower temperature object. It is the temperature difference between the two neighboring objects that causes this heat transfer. The heat transfer continues until the two objects have reached thermal equilibrium and are at the same temperature.

Principles of Heat Transfer

Heat is transferred to and from objects -- such as you and your home -- through three processes: conduction, radiation, and convection.

The transfer of heat energy is defined as heat flux, Q. By definition, this is the flow of heat energy through a defined area over a defined time. So, the units for Q are Joules (energy) divided by area (square meters) and time (seconds). Joules/(m^2∙sec).

The heat transfer formula through conduction is given by: Q/t = kA((T1-T2)/l), where Q/t is the rate of heat transfer, k is the thermal conductivity of the material, A is the cross-sectional area, T1-T2 is the temperature difference, and l is the thickness.

The thermal conductivity coefficient k is a material parameter depending on temperature, physical properties of the material, water content, and the pressure on the material [3]. The coefficient k is measured in watts per meter Kelvin (or degree) (W/mK).

Heat is transferred to unburned fuels by four methods: convection, radiation, conduction and mass transport. Convection is the upward movement of heated smoke, gases and air.

Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact. Fluids—especially gases—are less conductive.

What temperature is heat transfer? ›

What Temperature Do You Use for Heat Transfer Vinyl? The ideal temperature to use for heat transfer vinyl is between 260 ℉ to 315 ℉ (130 ℃ to 160 ℃) using medium pressure. It's important to read the product description of the heat press product before doing any work.

A warm air current is called a thermal updraft. These currents (known as thermals) are often used by birds as a path as they fly in the sky. A thermal updraft is what happens when air warms and rises due to its low density.

Conventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in the tropical atmosphere, cold air rises due to an overlooked effect — the lightness of water vapor.

Answer and Explanation: The technical name for an air current is atmospheric circulation. This is because air currents are the way air is distributed to different parts of the Earth.

They include wrong fluid selection, wrong flame impingement, improper startup & shutdown and a low flow regime. Cause: Heating a heat transfer fluid above its bulk temperature. A rapid rise in burner/boiler temperature.

Heat is transferred by three different methods: conduction, convection, and radiation.

Radiation. If you have stood in front of a fireplace or near a campfire, you have felt the heat transfer known as radiation. The side of your body nearest the fire warms while your other side remains unaffected by the heat. Although you are surrounded by air, the air has nothing to do with this transfer of heat.