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Wednesday, December 20, 2017
What the heck is Emissivity? (Part 2)
Fill up two soda cans with hot water and wrap one in scotch tape. Which one will cool down faster? Obvious, right? Check it out, you might be surprised!
Very nice demonstration ! Do I understand that the ability to absorb heat and the ability to emit it are basically the same physical property? If your two cans full of liquid started at room temp, and you put them in the refrigerator, will the taped one also get cold faster?
It's particularly interesting, because aluminum is such a good thermal conductor. How might you demonstrate this completely counter-intuitive difference between aluminum's high conductivity and its low emissivity ? What a great teaching tool !!
The ability to absorb thermal radiation and emit it are equal at the same IR wavelength. This is called Kirchoff's Law. So yes, the taped can would cool faster in the refrigerator.
In any heat transfer situation, one must think about all the heat tranfer mechanisms going on: conduction, convection, and radiation. Just because aluminum is a great conductor of heat, doesn't necessarily mean that it will always heat or cool the fastest.
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ReplyDeleteVery nice demonstration ! Do I understand that the ability to absorb heat and the ability to emit it are basically the same physical property? If your two cans full of liquid started at room temp, and you put them in the refrigerator, will the taped one also get cold faster?
ReplyDeleteIt's particularly interesting, because aluminum is such a good thermal conductor. How might you demonstrate this completely counter-intuitive difference between aluminum's high conductivity and its low emissivity ? What a great teaching tool !!
The ability to absorb thermal radiation and emit it are equal at the same IR wavelength. This is called Kirchoff's Law. So yes, the taped can would cool faster in the refrigerator.
ReplyDeleteIn any heat transfer situation, one must think about all the heat tranfer mechanisms going on: conduction, convection, and radiation. Just because aluminum is a great conductor of heat, doesn't necessarily mean that it will always heat or cool the fastest.
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Why apartment owners, condominium owners and management companies use webparkingsoftware.com
One of the most daunting operational aspects of managing a facility like condominium s and apartment owner is parking system. Finally, this challenge now can be streamlined with the help of smart parking solutions. One of the best providers of these parking management systems is webparkingsoftware.com. What are the reasons why apartment owners, condominium owners and management companies use webparkingsoftware.com? Read on.
Webparkingsoftware.com is recognized as a reliable service provider of parking problem solutions. They continuously gained the trust of many facility owners and manager and this is because they completely adhere to the most scalable approaches in designing their services. Plus, they also have a highly qualified management team equipped with a lifetime experience when it comes to parking management, IT software and business management.
Another reason why webparkingsoftware.com is preferred by many facility owners is that they are design excellent parking management software after conducting intensive collaboration of their reputable engineers. In connection to that, they also perform daily procedures on phone, paper,email and fax while applying the sheer power of Cloud technology in improving the delivery system of their organization.
Regardless the size of facility, http://webparkingsoftware.com has the capability to meet your particular needs. They have already mastered the art of designing state of the art software that will enhance the parking management aspect of your facility. Since they have been in the industry for many years, apartment owners, condominium owners and business owners already have the peace of mind that they are adept in the various needs of their clients in terms of parking management requirement.
Additionally, webparkingsoftware.com is chosen by many clients because of wide options of excellent features that they have to offer. This includes full parking management system, issuance of professional parking solutions, allocation of guest parking space for tenant, processing of tickets online and many more.
Plus, many users make the right choice to count on the services of webparkingsoftware.com because they adhere to the latest technology. They want to make sure that they are always one step ahead over their competitors when it comes to parking management. They implement All Internet web-based cloud systems in creating all their products. With them, you can also make sure that there are no hectic paper systems as they are more on automated systems.
They also offer iPhone functionality in order to come up with an easy use of parking enforcement along with security guards as well as authorized personnel. Since they provide easy add-all registrants features, you are now able to securely online as well as upload consent forms that are necessary for the user.
The reasons why apartment owners, condominium owners and management companies use webparkingsoftware.com have been explained. If you are adept to the situation, it is a good thing that you also make the right decision. If you are looking for the most scalable, flexible and reliable online parking management software, you can always give your trust to wenparkingsoftare.com as they will assure to have all your needs covered.
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