Results 1 to 6 of 6
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05-10-2010, 02:22 PM #1
info on electronic expansion valves
hi there.
im in college at the moment doing the last phase of my appprenticeship,doing a project on electronic expansion valves,and how they are more efficient over normal expansion valves looking for info on the internet cant really find much if anyone has any sites i could visit id be greatful
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05-10-2010, 05:51 PM #2
Re: info on electronic expansion valves
www.carel.com has case studies for electronic expansion valves, I would imagine Sporlan and Danfoss would also.
Phil
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05-10-2010, 08:28 PM #3
Re: info on electronic expansion valves
Sporlan's educational material has a paper on EEVs
http://www.sporlanonline.com/100-9.htm
Also check their literature section for any additional data that you may need.Brian - Newton Abbot, Devon, UK
Retired March 2015
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07-10-2010, 06:18 AM #4
Re: info on electronic expansion valves
The function of the thermostatic expansion valve (TXV or TEV) is to hold a constant evaporator superheat. When set and operating properly, the TXV will keep the evaporator active throughout its entire length. The conventional TXV is controlled by springs, bellows, and push rods. (See Figure 1.) The spring force is a closing force on the TXV. The evaporator pressure, which acts under the thermostatic element’s diaphragm, is also a closing force. An opening force is the remote bulb force, which acts on top of the thermostatic element’s diaphragm.
There is also a liquid force from the liquid line, which acts on the face of the needle valve and has a tendency to open the valve. However, this force is cancelled out when using a balanced port TXV. Working together, these forces maintain a constant evaporator superheat in a refrigeration system. There are no electronic devices associated with a conventional TXV.,..copied
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08-10-2010, 06:07 AM #5
Re: info on electronic expansion valves
There is an excellant independant study done, that was published by Ashrae (not by the EXV manufacturers).
As I cannot put the link direct in this post,
Just put h t t p : / / w w w .ashrae.org/docLib/20100804 lazzarin.pdf
Good luck with you studies!
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12-10-2010, 04:22 PM #6
Re: info on electronic expansion valves
cheers for the help lads got some good info,shud help me along nicely
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