Hot Gas Bypass Valve Application and Low Load Conditions
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- เผยแพร่เมื่อ 28 ส.ค. 2024
- Hot gas bypass valve operation is utilized in low load applications and conditions. Hot gas bypass puts a false load on the evaporator when the indoor temperature drops off, this helps to prevent short cycling of the compressor in low load applications.
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#hotgasbypassvalve #refrigeration #hvac
I love hot gas bypass valves 😆
Can you please make a video on head pressure control valve please.
Your explanation was thorough yet simple and to the point. You didn't try to crowd too much information into video.
Thank you sir
i get my gf to run flat after I raise her temp by backing out the screw through an open device, I screw in and out to back tension off, I have some superheat added into that, it gets warmer less chance that will cycle off, and back to normal conditions naturally on its own. I back off again and discharge my load in the theater. the load drops off because the body heat is gone. but I set for that. so that in a nutshell is how I adjust her full capacity attitude and generally a good example of an application of that. happy HVAC guys!
I see and read most of the comments Most guys understand quick. Others have No clu n got it confused w Txv. U explain it clear. I m not American n clearly understand ....fl weather around 60 s Good time for LAT and Low Load u put an easy Movie Theater example. Tnks n blessings
I struggle with mechanical load and ambient control. Specifically the applications of Hot Gas bypass and Headmaster Valves. I mostly understand what they do, and why, but i have the damndest time troubleshooting if they are the problem.
Thanks for this video. Long time watcher, seldom commentor.
Wow very well explained.
Thanks for the knowledge. I think I’ve learned more from your videos than my coworker who considers himself a “super tech”.
My pleasure. Lol!
Thanks Gary! Great explanation. Watching this video will make the actual Sporlan literature for these valves easier for me to digest.
I love hearing that, thank you
Thanks so much needed this for tomorrow’s job
We use the same pipe set up but use a rapid cycle solenoid and no HGBV to control really tight temperatures in our environmental rooms.
Cool!
Do you use a PLC to control the toggle cycle of the solenoids? Or is it controlled by a relay?
@@Thiscutepup we use a Loop controller and a relay to cycle it on and off. Company be buy the controllers from is called Future Design control and its the R-22 controller.
Thanks! I took a look at the website and the controllers they offer. Never heard of this company, but they type of controllers look like a nice drop in for Watlow controllers. I really like the Watlow controllers, but they are very expensive. Most customers don’t need the amount of features either. What I have found out is toggling solenoids works well, however some size units need an adjustable valve inline with the solenoid to meter the amount of hot gas entering the evaporator. This way to can adjust the Hot Gas Bypass Valve to the exact PSI that you want. I watch the controller to see the temp swing. I want to mention that Hot Gas is not greatly energy efficient, although the machines run really well when not cycling and can maintain a consistent temp inside the evaporator. We can hold a temp of -+.5 degrees on oil and water cooling. This helps our customers achieve ultra precision in their processes.
Good video! It's a way to balance the load on small refrigeration systems
Great videos man. Listen to your podcast too. Thank you for what you do for the trade
Thank you, doing my best haha
So technically its job is similar to a epr and a headmaster ? Great vid and EXPLANATION btw u make it very understanding.
Not really a head master maintains head for low ambient and an EPR is on the outlet of the evaporator
Great explanation of the system!
Thank you
Great explanation on the hot bypass valve. Thxs for the vids!
Thank you and my pleasure
Thanks man!
Thank you sir; Great Video keep up the good work
Love this style of vid. Great work
Thank you I appreciate that!
Good job
Thanks
My pleasure
Very clear explanation, thx
You're welcome
Very well explained. Thanks!
Thank you for sharing your knowledge. Great video
Thank you and you're welcome
@@HVACKnowItAll you bet..
One of the very important part on hot gas defrost missing …
This is not hot gas defrost, it's hot gas bypass
Great demonstration! Thank you very much. What's the purpose of the pressure equalization line here?
Good day sir.thanks for information very clear explanation
Well explained 👏
This is a great video!
Thanks
I have seen some hot gas bypass lines connected to the suction line (in between compressor and evaporator) as opposed to inlet evaporator like in this video. How are they exactly different?
Same question i got when i see his Diagram seems like same Line ......but doing different case scenario as he mentioned Movie Theater....Low Load versus LAT make sense i guess ....
Have you worked on environmental test chambers and chillers?
Well done!
Thank you
Thanks for the information
good explanation thanks
You're welclme
great information knowledge is the key to success
Yes it is, thank you
I am a chill water technician from st Lucia
Lovely weather I bet!
yes sunny in the Caribbean with a little rain in between you should take the trip on a vacation lol
Yes but our conrona restrictions re-entering are crazy so no traveling for a while.
Good explanation👉
Thank you!
The way you explained this sounds like it operates similar to a TXV...
Not exactly, TXV opens on a rise in bulb temperature. A hgb valve opens on drop in suction pressure.
Hi,
Great video !
I have also a hot-gas bypass valve on my LG multisplit, but it is bypassing directly the compressor's output to the input of the accumulator (just before the compressor input).
When the hot-gas is activated, for example when a split is stopped, I can see the high pressure decreasing and the low pressure increasing.
However, what is strange to me, is that when the hot-gas is deactivated after 30 seconds, the high-pressure recovers quite fast its initial value, but the low pressure is dropping much lower than its initial value (for example, from 8.3 bars to 6.7 bars) and seems to stay at this lower value (until the outdoor unit regulation is changing the inverter compressor speed).
Do you have some explanation why it behaves like that ? I am not really sure that it is normal since it is generating periodical fluctuations of the regulation :(
Thanks a lot and regards
Good day sir. What is the actual low pressure of -10 and what is the deffirential walk in chiller. Thank for your help
If discharge high pressure and high temperature that time not use this please explain
Great Explanation!
Could you make a video explaining the difference between this Hot-gas bypass valve method and the Evaporator pressure regulator (Danfoss KVP)? Is it technically the same?
Hey question to close it I have to counter clockwise rite?
Why you don't see hot gas bypass to use as defrost in domestic fridge or freezer? My dad use to have an old fridge with hot gas bypass defrost
Good stuff
Thank you
Can i replace the sporlan hot gas bypass valve with a solenoid controled by a digital tempreature sensor
The sensor will measure suction line temp and control hot gas bypass valve
seems like it wastes energy not to cycle compressor?
Great explanation is this system factory or do some components needs to be field installed?
Both
@@HVACKnowItAll thanks for sharing
It can be use Blast Freezer? Plz explain me
What actually shuts cooling down will the hot gas bypass continue to run when show is over
If it hits full on set point, the system will shut down. The hot gas will stop feeding on the off cycle.
Salam size bir sualim var?
Valve soyuq hava seraitnde isleye biler
is this condition liquide refrigerant may be come back to the compressor
HGBV is for tight temperature control.
I have questions? am working on a unit that has hot gas valve when you put the unit on the temperature is able to come down to about 19/c but when the hot gas comes on you have the temperature reading 23 and it doesn't come down any more
These are room temps? Hot gas is for low load conditions. It needs to be set to supply hot gas when the load and corresponding evap pressure falls off.
Will you be able to put what you explained on a PH diagram or in equation forms using thermodynamic cycle?
But what is the function of the equlizer line
How do bypass valve of expansion valve works?
RAWAL DEVICE WOULD BE GOOD IN THIS EXAMPLE
The guy training me saw one of these the other day and legit said “I’ve never seen anything like that before...” 🤦♂️
You're dragging the guy training you because he hasnt seen something?
Awesome
Good video. I follow on how the hot gas creates a load on the evaporator but is there another component after such as an accumulator to return the refrigerant back as a vapor? I haven't seen this setup in the field before. Thanks.
There is never a receiver after an evaporator, the receiver is after the condenser. It's still returning as a vapour, the discharge gad is highly superheated vapour
Sorry my bad, thought you said receiver but none the less no vapour will get back during hot gas byapss
Thanks for responding. So you are saying the hot gas in the evaporator has some heat removal but not to the point of changing state? Therefore vapor still returns to the low side of compression.
@@HVACKnowItAll I see accumulators after evap to catch any liquid,saves compressor from slugging
Yes those are common in refrigeration. I used to do commercial refrigeration. It was a vital component especially freezers where the coil must be flooded with liquid for below zero temps.
Hot gas bypass valve in Air dryer not allowing to transfer the Cold refrigerant into evaporator why? transfer hot refrigerant into evaporator
Really good video but could you or someone please explain the difference between this and a headmaster valve? Are they essentially they same just different terms? Thanks
Headmaster or OROA is for head pressure control at low ambient conditions.
@@ES-ml4cg thank you for the reply. Sorry I'm just confused, but why do you need to keep the head pressure up? So the low side stays up as well?
Does the compressor delivery pressure becomes less when bypass valve is open?
No it becomes more, it's adding pressure the to suction line
But on the discharge line the pressure will drop a little, sorry, not exactly sure what you're asking.
how does hot gas bypass work??
That was explained in thr video
Salam
The way you explained this sounds like it operates similar to a TXV...
Nah dude. Nothing at all lol. A txv is there to throttle liquid into evap to provide cooling.
This is just a valve that allows heat to enter the low side to increase pressure a bit when there is no load.