Since the compressor will spin faster
educate me on how that happens, except the few % due to slip
Type: Posts; User: junkhound
Since the compressor will spin faster
educate me on how that happens, except the few % due to slip
Breaker will trip before smoke, given thermal mass of that size motor. Reset breaker a few times, then smoke <G>
Raise, not lower frequency to run at 460.
If the 380v was at 50 Hz, 460v is...
--- for personal use ----
The formerly FREE harbor freight meter are OK, I have about 20+ of them laying about the shop and in vehicles for convienience. All within 1/2% accurate on voltage.
...
No idea what was exactly going on in 1890 as far as trade licensing, but I know income tax was being discussed nation wide, gun control already, and trade licensing probably.
So, WA state has NO...
Dangerous: as in tch used to R22 venting system in a basement, then lighting up a cigarette, kaboom. - actual scenario case study in Japan where R290 legal.
Most asian countries use propane in...
some hints for the op in that thread:
a. 1 ton = std common measure for energy to melt a ton of ice, std value - 12000 BTU, a btu is energy to raise 1# of water 1 deg F
b. use psychometric...
am not approved to reply to aop, but scanned that thread reference in thread title, good grief, biggest takeaways:
a. OP unable to open a pdf file
b. op unable to lookup on on net what a...
Sleepless night, might be one of your early responders, this was the last comment I had.
BTW, good idea about getting a wide range of inputs, my <technical> input is probably an outlier to <the...
Update
Ended up doing a fixed installation, fiberglass batts over windshield, plywood "wall".
Mounted indoor unit on that 'wall', fixed unit on pad outside.
12,000 BTU Klimeaire.
Got...
Near record lows here this week (Seattle area), reached out to some HO to see how their GSHP and minisplits working.
Designed GSHP for 5300 sq ft house, installed 5T system with 5.6 COP about 15...
Cannot recall if posted in this thread earlier, but have instlled dual HP systems in large PNW houses.
2T air-air HP/AC, and condensor coils in same ducting a 5T GSHP, HP only mode.
In HP...
Has anyone tested the control unit range for different minsplits. Do not see anything aobut that on any of the mfg literature.
Since the controls seem to be universal within the same brand/model...
How effective is a simple 3/8 ply mobile home skirt.
Obviously very effective for keeping critters out, say the floor is only R6, what is the effective R rating with a skirt assuming 80 ft...
Even in mild PNW (Seattle) own house switches from air-air HP to 2nd HP (ground source) at 40F.
Dealing with crappy co workers and customers.
Worked for large corporation so could kick that up a level to management, small business owners likely one of the worst problems.
- How to manage...
COP = heat transferred/power in
heat to floor = heat transferred
cooled air effect around HPWH = heat transferred - power in
So, net heat to floor minus cooling effect = power in ; thus,...
No responses yet?
Only way I have thought of is line voltage tstat == other than major hack of a mini split control system with aleksa or somethng similar.
Lots of wifi ocntrolled tstats out...
Any easy way to control via bluetooth?
Converted school bus, has reear door.
Used as stationary living for short terms, PNW climate,
Thinking of making a replacement 'swap out' door with a minisplit mounted on the swap out plywood...
Yep, as oothers have said, the NT item is a toy.
I have a Ford 4500 backhoe and a backhoe attachment for Bobcat 853.
Even at that scale, the hydraulic power available is VERY noticeble. The...
The big old oil furnace HV transformers were all nominally 10kV, 10 mA current limit to prevent electrocutions. Not pleasant to get ahold of though <G>
Piezoelectric sparks on WH and BBQ grills...
Is there a formula?
Already stated, you need the displacements and volumes and speed.
Then draw out your Mollier diagram, calculate entropy values, use refrigerant tables for entropy per mass...
yall are worried about efficiency on a rv, good luck.
I hear ya!!
First thing is insulated skirt around the bottom, and add some 2" styrofoam over some of the windows. Whole 'nuther...
Yep on the back might work, can mount the narrow side against the bus, so only 2 ft or so projection , could add a tail light to it to stay road legal. GD usually tows trailer with car also, so no...
RV heat pump
Grand-daughter want sto use her old RV school bus conversion for an airbnb.
PNW climate, 'never' gets below aboout 25 F.
So, grandpa, can you put a 19 SEER or better heat pump on my RV?
...
current problems you guys are facing in doing business
Tis is a different take from old 78 YO guy, responding only since bez replied with the getting out of bed comment (his other comments right...
Nobody mentioned oxy propane yet.
Have not used acetylene for over 20 years, I even use oxy/propane for cutting up to 2" thick steel plate. Big $$ savings using propane also.
My shop hose is 50 ft long, ah prefer to do cutting outside when I work with steel for other than HVAC brazing.
Never any problem with the 50 ft.
Have not used acet for nearly 10 years,...
About 1 in 10,000 people are hypoallergic to ozone, my wife is.
Found out when she about passed out when I asked her into my lab and wanted to know if she smelled the ozone when I turned on a UVC...
re: Hold test more critical than pull down point.
+1 i quit bothering with micorn gauge many years ago as never do any work under about 30F. Water boils at 1000 microns at 2F, so that is plenty...
Since there is no even a user manual online for the elkron SCR modules, and the controller is a variable resistance, will follow down the rabbit hole with a guess.
The variable resistance...
WA is typical liberal state, lots of gov regulations, etc.
By the book in some areas the permits are daunting, recently did an electrical service to a shed for a cooler and the electrical permit...
fan motor power goes up by factor of about 2.4. (cube of speed)
You are good to go if your existing motor is way oversized (One HP vs. common 1/3 HP) or if you triple the fan motor HP; and yes,...
My legal counsel tells me that providing Ashrae interpretation advice needs to be billed at our standard consulting rate. Cost details are not allowed on this site.
re: after I visit the clinic...
Normal person at rest is 400 BTU/hr, chair takes 377 watts for 30 seconds 5 times an hour for 18 seconds = 53.6 BTU/hr.
Energy burst when Dr. Daryl B Payne tells patient that a root canal is...
Most interesting has to be repair done on a classified military ship in the north Pacific ocean. Cannot give any details on the system, but just getting there on the general's helicoptor flying...
24 k btu/hr
125,000 pounds of water, so it takes 5 or so hours to heat the pool by 1F.
Assume 10 hours per day your cooling runs, 2F per day.
Depending on the heat going into the ground and...
I had a '71 Datsun truck that quit at 385 K miles, never changed the oil in last 200 k miles, just the filter, topped off when it got low with used oil out of other vehicles.
surprised it took 14 mesageges till pecmsg suggested soldering on a short wire lead.
Drill and tap is also easy option, just watch where the chips fall. 3 minutes if yah got the drill and tap. ...
Since modshave not yet turned thread off for DIY and is not really hvac, this is how I do it very simply with air tank.
Pump sized to provide no greater than needed flow and pressure with flow...
A bit off the subject, but real estate market in many states is so high priced, young folks cannot afford unless their grandparents bought some property 50 years ago.....
When my 5T HP scroll froze up replaced it with a 2T scroll (since one on hand in shop) and recharged by subcool (R22 with TXV system). Allowed part of condensor as receiver. Plotting temps and...
one more;
stick of dynamite convets solid to gas, propane air only PV/T produces overpressure
2000 BTU for 1.6#of air gives temp rise of 4*2000/1,6 = 5000 F
(5460/395)*14.7 = 'only' 165 psi...
Interesting calc to do for any physics students <G>
Fridge door with mag stip max overpressure during ignition of propane air, how much difference will there be with an unloaded fridge door or a...
Have used R290 in own 'experimental' systems using R22 compressor and txv, used right out of 5 gal bbq tank run thru filter drier. Filter dryer removes the mercaptan also as similar molecule to...
simply ground one side of an isolation transformer that has same rated input and otuput voltages and power rating.
The isolation transformer will be LOTS biGGER.
automotive propylene glycol can have up to 5% of simple sodium salts (nitrates, borates).
The York msds shows < 2.2% of dipotassium phosphate. NO sodium salts.
Has anyone seen any data on...
PS: Installed simple 1T minisplit into a stand alone 780 sq ft office in 2011, built to WA state energy code. Owner related last year that power usage had never gone above 340 kW-hrs a month even...
Could not reply (no AOP reply priveledges) so will throw this in here relative to a Bellevue new guest with HP questions.
Have lived in Renton WA for 55 years (4 mi south of Bellevue), back in the...
Military base work <g>
have worked on many bases, they are literally all over the world.
Unfortunately, my employer most often would send me to Montana in the winter and Corpus Christi in the...