Search:

Type: Posts; User: git-r-dun

Page 1 of 13 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    186
    Views
    7,611

    Higher SEER have less latent removal

    That makes perfect sense and thank you. I was thinking in those terms as well with the only exception of, instead of reducing capacity to achieve constant dehumidification at a lower rate, we operate...
  2. Replies
    186
    Views
    7,611

    As far as moisture removal alone goes it will...

    As far as moisture removal alone goes it will vary based on the above info you mentioned and the constantly changing environment. Not much to dispute there. What I was trying to understand was your...
  3. Replies
    186
    Views
    7,611

    A starved evaporator will also have a minimal to...

    A starved evaporator will also have a minimal to non existent dehumidification ability. Bottom line is you need a flooded coil for optimal dehumidification with some sort of reheat.
    As far as...
  4. Replies
    33
    Views
    3,224

    Pressure switch tool

    I'm on the market for one as well. It would be great for testing air proving switches on reheat coils, setting pressures on high/ low static safety switches, testing pressure transducers, etc. My...
  5. Replies
    35
    Views
    4,649

    I definitely see what you're saying but the...

    I definitely see what you're saying but the compressor (motor) is maintaining a constant rpm whether loaded or unloaded and pumps at full capacity when loaded to nothing when unloaded. There is no...
  6. Replies
    35
    Views
    4,649

    Response above. Wouldn't let me post if I didn't...

    Response above. Wouldn't let me post if I didn't write something here :)
  7. Replies
    35
    Views
    4,649

    Any application where one compressor serves...

    Any application where one compressor serves multiple evaporators, condensers, etc would require oil return provisions (digital or conventional). This is what they mean when stating "If the system...
  8. Replies
    27
    Views
    1,426

    piston size and capacity question

    That doesn't appear to be accurate either. The 6 degree SH is indicating that even though there is more refrigerant in the evaporator coil, due to metering device over feeding, there is still enough...
  9. Replies
    27
    Views
    1,426

    piston size and capacity question

    That's not true. The evaporator and air exchange heat. The air needs to provide as many BTUs necessary to boil the refrigerant contained in the coil. Flooding the coil means there may not be enough...
  10. As mentioned, oversized metering device. In...

    As mentioned, oversized metering device. In addition, it's impossible to have a lower than ambient liquid line temperature. Nothing indicates a restriction so you may want to verify your equipments...
  11. Replies
    67
    Views
    5,843

    I'd say its good :)

    I'd say its good :)
  12. Replies
    67
    Views
    5,843

    That's where I disagree. 5 ohms across a switch...

    That's where I disagree. 5 ohms across a switch is an open to me. This is the reason why I never use continuity on meters, only Ω, ΚΩ, ΜΩ. The video is interesting. The beginning basically describes...
  13. Replies
    67
    Views
    5,843

    An open on a series circuit can be of a low...

    An open on a series circuit can be of a low enough resistance to show voltage at the load but significant enough to not "carry" current.
  14. Replies
    67
    Views
    5,843

    He reads 27 volts with one lead disconnected not...

    He reads 27 volts with one lead disconnected not both. None the less there's an open somewhere in the control circuit
  15. Replies
    8
    Views
    893

    If you want to measure positive pressure, say on...

    If you want to measure positive pressure, say on the supply duct, hook up the + to your pitot tube in the duct and allow - to be open to atmospheric pressure. For return do the opposite. To measure...
  16. Replies
    26
    Views
    2,316

    To answer your question, none. Understanding the...

    To answer your question, none. Understanding the operation and flow of refrigerant is important and there is a misconception it appears of what a TXV does. Although TXVs aren't utilized as a...
  17. Replies
    12
    Views
    1,142

    Are you sure it's not a 410a system? (Both...

    Are you sure it's not a 410a system?
    (Both lines are pretty much at ambient temperature?)
  18. Replies
    26
    Views
    2,316

    I wonder what the logic is behind that. It's not...

    I wonder what the logic is behind that. It's not adding up in my head how it is recommended on an undercharged system to increase TXV SH setting in order to get subcooling and then magically expect...
  19. Nice real world picture you drew. I personally...

    Nice real world picture you drew. I personally don't experience that but everyone knows that's not too far fetched.
  20. Replies
    16
    Views
    1,212

    Friend, neighbor, Craigslist partner....

    Friend, neighbor, Craigslist partner....
  21. Replies
    6
    Views
    1,013

    Are both stages operating? Is there a chance that...

    Are both stages operating? Is there a chance that your second stage is coming on before your first stage or the circuits are reversed? (Bottom of coil should always be first stage)
  22. Replies
    109
    Views
    8,232

    There's a difference between providing good...

    There's a difference between providing good service and being professional, from tolerating manipulative, abusive, and scam full customers. Just because they're paying doesn't entitle them to to be...
  23. Replies
    109
    Views
    8,232

    If the customer is always right, are you...

    If the customer is always right, are you immediately just adding refrigerant to their systems? Most will tell you that's what their problem is.
  24. Thread: Water Leak

    by git-r-dun
    Replies
    11
    Views
    829

    I was thinking along the same line. More from a...

    I was thinking along the same line. More from a loss capacity aspect though
  25. Thread: Water Leak

    by git-r-dun
    Replies
    11
    Views
    829

    I wouldn't imagine an airflow restriction based...

    I wouldn't imagine an airflow restriction based on the 12 degree split (it would be higher, even at the higher humid conditions). Cleaning the evap is a good start as mentioned above. Check your SH...
  26. Thread: Ac troubles

    by git-r-dun
    Replies
    5
    Views
    697

    It almost appears that you weren't at a high...

    It almost appears that you weren't at a high enough range on your meter. Sensors/ thermistors are typically in the KΩ range.
  27. Thread: BTU's

    by git-r-dun
    Replies
    17
    Views
    1,213

    The flask would require some btus as well. The...

    The flask would require some btus as well. The formula for anything is
    BTU= lbs (per hour) x Δt x Specific Heat
    So if you had 1 pound of water in a glass flask weighing 1 pound, you'd need 1 Btu...
  28. Thread: psycrometer

    by git-r-dun
    Replies
    42
    Views
    3,966

    Believe it or not the most educational stuff come...

    Believe it or not the most educational stuff come from the dissection of vague questions. I think most people gain something when everyone throws in their two cents or past experiences, even if it...
  29. Thread: psycrometer

    by git-r-dun
    Replies
    42
    Views
    3,966

    Only one person has mentioned airflow so far...

    Only one person has mentioned airflow so far though. There is no point in taking any of these measurements and using that formula (which doesn't have an air volume factor in it) if you can't...
  30. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Thanks, good read. Yeah I knew that, just tried...

    Thanks, good read. Yeah I knew that, just tried to build off of been there's post. The only way we'd have pure liquid is if we subcooled the liquid to the evaporator saturation temperature prior to...
  31. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Agreed. Although I stated otherwise above.

    Agreed. Although I stated otherwise above.
  32. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Actually it really is. The refrigerant relies on...

    Actually it really is. The refrigerant relies on the conditioned air to give it enough heat as much as the air relies on the refrigerant to "cool" it ( heat exchange). You will have liquid in the...
  33. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    If you have a 2 pound capacity and 1 of it...

    If you have a 2 pound capacity and 1 of it changes state it becomes a mixture of both throughout the circuit until additional heat can be absorbed to boil of the remaining half. When that occurs you...
  34. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    So that being said, when we are measuring...

    So that being said, when we are measuring superheat, at the outlet of the evaporator, that 36 degree liquid would of have to become a 40 degree vapor giving a 4 degree SH and 100% vapor.

    If no,...
  35. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    It was, thank you. So is it possible at that...

    It was, thank you.

    So is it possible at that last portion, lets just say the outlet of the coil, to have 36 degree liquid with a vapor of 40 degrees?
  36. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Had to correct the above statement.

    Had to correct the above statement.
  37. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Good point, but I think what we see there is the...

    Good point, but I think what we see there is the warmer sub cooled liquid out of the condenser absorbing heat from the cooler, saturated liquid in the evaporator. The btus required for it to match...
  38. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    So are you saying: A 63 psi R-22 coil with a...

    So are you saying: A 63 psi R-22 coil with a saturation temperature of 36 degrees can have a mixture of 36 degrees liquid and 40 degrees vapor?
  39. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    I'll have to start adding salt to my R-22 :)

    I'll have to start adding salt to my R-22 :)
  40. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Yes, direct contact. I assumed that was a given...

    Yes, direct contact. I assumed that was a given but then again we can go around and around on just about anything here :) Funny thing is that everyone, to a certain extent, is right in a way.
  41. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    How many Btus is required to make10 lbs 32 degree...

    How many Btus is required to make10 lbs 32 degree ice to 40 degree water?

    Before that 32 degree ice can gain sensible heat to go to 40 it MUST become water in its entirety. It must completely...
  42. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    And again, that would be the ideal situation IF...

    And again, that would be the ideal situation IF our pressures were dead on and at a true CONSTANT. Our thermometers were precise, and temperatures accurate.
  43. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    And that's where I'm coming from. That's how the...

    And that's where I'm coming from. That's how the laws of physics and chemistry are set. We shoot for a "cushion" to play it safe due to all other variables in the field/ real world.
  44. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    I'm sure you can, but I can only come up with all...

    I'm sure you can, but I can only come up with all the wrong reasons. Like thermometer locations/ calibration, pressure fluctuations within the system, flow restrictions, etc.
  45. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    The refrigerant in the evap coil is pretty much...

    The refrigerant in the evap coil is pretty much at saturation. It's not gaining heat to work its way up to it. If that was the case the liquid refrigerant would have to be well below the saturation...
  46. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Hurtinhvac, that was a fine visualization you...

    Hurtinhvac, that was a fine visualization you gave me :)
  47. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Key word is CONSTANT. I agree with the fact that...

    Key word is CONSTANT. I agree with the fact that a uniform condition will not exist in a large mass, non the less one in motion, however in order to understand it you must take a uniform sample under...
  48. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    Negative. Superheat is a sensible temperature...

    Negative. Superheat is a sensible temperature measurement compared to a saturation temperature (estimated by an existing constant pressure in a heat exchanger). In order to have a sensible gain of a...
  49. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    If I followed you correctly yes. But keep in mind...

    If I followed you correctly yes. But keep in mind that the steam/ vapor is still at the same temperature as the liquid, so the saturation temperature and existing temperature in the enclosure is the...
  50. Thread: Superheat

    by git-r-dun
    Replies
    92
    Views
    6,970

    The confusion here is that there will be no...

    The confusion here is that there will be no transition of state if a heat exchanger (evaporator) is full of liquid. That is simply not the case. Assume 1 lb water (easier to relate to for people) is...
Results 1 to 50 of 621
Page 1 of 13 1 2 3 4
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event