Chiilers?

lennyd19 · 08/30/2006, 07:52 PM

What exactly is a thermal expansion valuve?

PatMayo · 09/04/2006, 07:19 PM

As the refregerate heats up it has to have room to expand. Well I don't know if that is exatly it.

Do a google search and you will most likely find your answer.

Regards,

Pat

chrismunn · 09/04/2006, 07:30 PM

ide like to know what it has to do with a chiller? ive never heard of thermal expansion valuve before mentiond in association with a chiller...

DaveBrader · 09/04/2006, 08:13 PM

A thermal expansion valve is the part of the system that allows refridgerant to flow thru the system at a rate that allows it to accomplish heat exchange and turn to a gas before it gets to the compressor. Without some sort of control, such as a TXV, the refridgerant would flow so fast that all of it would not evaporate, causing liquid refridgerant to get to the compressor and destroy the compressor.

It works by opening and closing a valve that allows the refridgerant to pass by it at a rate that will get the optimum heat exchange in the evaporator coil without letting unevaporated refridgerant passing thru to the compressor. The pressure of the liquid refridgerant turning to gas is what opens and closes the valve. i.e. "thermal expansion" valve. Other systems use different methods to accomplish the same thing. A TXV is usually only found on large systems designed to have a heat exchange of more than 15,000 BTU's per hour. Most small chillers do not use a TXV. Most small window style AC units do not use a TXV.

You can put a TXV in any system as long as it is matched to the system. A TXV is the most efficient way of accomplishing this.

All large AC and Refridgeration units have a TXV.

Dave

08/30/2006, 07:52 PM	#1
lennyd19 Registered Member Join Date: Feb 2005 Location: ny Posts: 334	Chiilers? What exactly is a thermal expansion valuve?

09/04/2006, 07:19 PM	#2
PatMayo Registered Member Join Date: Sep 2005 Location: Seattle Posts: 2,843	As the refregerate heats up it has to have room to expand. Well I don't know if that is exatly it. Do a google search and you will most likely find your answer. Regards, Pat __________________ 90 AGA Megaflow (Setup 1-24-06) 120 Lbs. Liverock EuroReef RS 100 Skimmer 2 X 150 MH 2 X 96 watt PC Actinic 2 Clarki Clowns (31 months old) 1 Niger Trigger (Owned 6 months) 2 Tunze 6055 PH Current Tank Info: 90 AGA Megaflow To Be Mixed Reef

09/04/2006, 07:30 PM	#3
chrismunn Registered Member Join Date: Aug 2004 Location: Austin, Texas Posts: 4,200	ide like to know what it has to do with a chiller? ive never heard of thermal expansion valuve before mentiond in association with a chiller... __________________ Marine Aquarists Association of South Texas Austin Reef Club PBITAWA... Current Tank Info: 14g bio cube

09/04/2006, 08:13 PM	#4
DaveBrader Registered Member Join Date: Jun 2004 Location: St. George Utah Posts: 268	A thermal expansion valve is the part of the system that allows refridgerant to flow thru the system at a rate that allows it to accomplish heat exchange and turn to a gas before it gets to the compressor. Without some sort of control, such as a TXV, the refridgerant would flow so fast that all of it would not evaporate, causing liquid refridgerant to get to the compressor and destroy the compressor. It works by opening and closing a valve that allows the refridgerant to pass by it at a rate that will get the optimum heat exchange in the evaporator coil without letting unevaporated refridgerant passing thru to the compressor. The pressure of the liquid refridgerant turning to gas is what opens and closes the valve. i.e. "thermal expansion" valve. Other systems use different methods to accomplish the same thing. A TXV is usually only found on large systems designed to have a heat exchange of more than 15,000 BTU's per hour. Most small chillers do not use a TXV. Most small window style AC units do not use a TXV. You can put a TXV in any system as long as it is matched to the system. A TXV is the most efficient way of accomplishing this. All large AC and Refridgeration units have a TXV. Dave