Ads
related to: heat transfer hot to cold- Grades 6-8 Science Videos
Get instant access to hours of fun
standards-based 6-8 videos & more.
- K-8 Science Lessons
Used in over 30,000 schools.
Loved by teachers and students.
- Videos & Lessons
View the Available Lessons And
Select the One You Prefer.
- Explore Activities
Browse Through Our Video Gallery To
Get Insights About DIY Activities.
- Grades K-2 Science Videos
Get instant access to hours of fun
standards-based K-2 videos & more.
- Read The FAQs
Get Answers To Your Questions.
Learn More About What We Do.
- Grades 6-8 Science Videos
Search results
Results From The WOW.Com Content Network
Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species (mass transfer in the form of advection), either cold or hot, to achieve heat transfer. While these mechanisms ...
Hot areas are shown in red, cold areas are shown in blue. A hot, less-dense material at the bottom moves upwards, and likewise, cold material from the top moves downwards. Convection (or convective heat transfer) is the transfer of heat from one place to another due to the movement of fluid.
This equation uses the overall heat transfer coefficient of an unfouled heat exchanger and the fouling resistance to calculate the overall heat transfer coefficient of a fouled heat exchanger. The equation takes into account that the perimeter of the heat exchanger is different on the hot and cold sides.
The statement of Newton's law used in the heat transfer literature puts into mathematics the idea that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings. For a temperature-independent heat transfer coefficient, the statement is:
In thermal engineering, the logarithmic mean temperature difference (LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers. The LMTD is a logarithmic average of the temperature difference between the hot and cold feeds at each end of the double pipe exchanger.
As is usual in thermodynamic discussions, this means 'net transfer of energy as heat', and does not refer to contributory transfers one way and the other. Heat cannot spontaneously flow from cold regions to hot regions without external work being performed on the system, which is evident from ordinary experience of refrigeration, for example ...