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Search took 0.00 seconds. Search: Posts Made By: buffalobillpatrick
Forum: Geothermal & Heat Pumps 02-19-15, 08:02 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Thanks A/C for graph, I removed the fudge_factor...

Thanks A/C for graph, I removed the fudge_factor after looking at it.
Forum: Geothermal & Heat Pumps 02-19-15, 12:52 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
A/C, Thanks Works Damn great. At 30PSI...

A/C, Thanks

Works Damn great.

At 30PSI results are -.07*F
At 300PSI results are -.04*F



float calc_R290_Saturated_Temp(float psi)
Forum: Geothermal & Heat Pumps 02-19-15, 12:15 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Thanks A/C I'm only interested in 30-> 300PSI...

Thanks A/C
I'm only interested in 30-> 300PSI range if it won't be too much trouble.

My table lookup method works accurately & only produces 2% more object code.
Forum: Geothermal & Heat Pumps 02-19-15, 11:36 AM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Thanks A/C float...

Thanks A/C

float degF=-40.3085122205+(1.81496452942*psi)+(-0.0101201804003*psi^2)+(3.05234258195e-005*psi^3)+(-3.37963005786e-008*psi^4);

Nope, don't compile:

sketch_subcool_3.ino: In...
Forum: Geothermal & Heat Pumps 02-18-15, 02:01 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
A/C did I get this right? How did you come...

A/C did I get this right?

How did you come up with such an accurate formula??




float calc_R290_Saturated_Temp(float x)
{
Forum: Geothermal & Heat Pumps 02-18-15, 12:45 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
I convert function input parameter "float PSI"...

I convert function input parameter "float PSI" into array index:

//convert PSI to array index
work = ((PSI - 30.0) / 10.0);

I = work; //drop decimals to...
Forum: Geothermal & Heat Pumps 02-18-15, 12:28 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Please share that line of code! Yes Look-up...

Please share that line of code!

Yes Look-up table sort-of

I looked at the table: HC-290 (PROPANE) PRESSURE - TEMPERATURE CHART (http://virtualmark.net/wx/pressure.htm)

and entered the table...
Forum: Geothermal & Heat Pumps 02-18-15, 11:58 AM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
"The Emerson EX2 pulse modulated electric valve...

"The Emerson EX2 pulse modulated electric valve is an electrically driven expansion valve that provides precise temperature control. It is designed for use with R-12, R-22,
R-134a, R-404A, R-407C...
Forum: Geothermal & Heat Pumps 02-17-15, 07:55 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Mike, Is this a good EEV? ...

Mike, Is this a good EEV?

http://www.emersonclimate.com/Documents/FlowControls/pdf/electronicexvalves/EX2-Pulse-Modulated-Electric.pdf

PID with PWM for 6sec. for the above EEV looks pretty...
Forum: Geothermal & Heat Pumps 02-17-15, 07:33 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Mike here is some working PID code that I stole: ...

Mike here is some working PID code that I stole:

From Wikipedia: "A PID controller calculates an 'error' value as the difference between a measured [Input] and a desired setpoint. The controller...
Forum: Geothermal & Heat Pumps 02-17-15, 02:18 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
What do "All-ya-All" (Texas lingo) think of...

What do "All-ya-All" (Texas lingo) think of NiHaoMike's post #4, 7, & 12 regarding Superheat?

Thermistors are sure easier & cheaper than Pressure Transducers.
Forum: Geothermal & Heat Pumps 02-17-15, 01:27 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
//////////////////////////////////////////////////...

////////////////////////////////////////////////////////////


Raw_ADC = analogRead(Lo_Side_Pressure_Transducer_pin);//read Suction pressure

if(DEBUG){ Raw_ADC = 400;}

Suct_PSI = ...
Forum: Geothermal & Heat Pumps 02-17-15, 01:27 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Added Subcooling Hi Side Pressure...

Added Subcooling

Hi Side Pressure Transducer:

1 8 (http://www.ebay.com/itm/201233271513?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)

...
Forum: Geothermal & Heat Pumps 02-15-15, 01:15 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Mikesolar, I think that Subcooling would be easy...

Mikesolar, I think that Subcooling would be easy to add & I think that I will work on that next.

I don't know anything about controlling EEV's, I refer to others like BradC. who used a stepper...
Forum: Geothermal & Heat Pumps 02-15-15, 01:01 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
NiHaoMike, I don't see how that can work? ...

NiHaoMike, I don't see how that can work?

That seems to assume that the refrigerant temperature going into the evaporator is exactly the temperature that ALL of the evaporation takes place?
...
Forum: Geothermal & Heat Pumps 02-15-15, 11:31 AM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
NiHaoMike, where would those 2 temp. sensors be...

NiHaoMike, where would those 2 temp. sensors be placed on a coax evaporator?

See: post #108
...
Forum: Geothermal & Heat Pumps 02-14-15, 05:34 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Yep wrote it. Got the idea from BradC post ...

Yep wrote it. Got the idea from BradC post

http://ecorenovator.org/forum/geothermal-heat-pumps/2061-brads-gas-gear.html


"I've built the R290 PT Chart into the software, and that pressure...
Forum: Geothermal & Heat Pumps 02-14-15, 04:37 PM
Replies: 48
Views: 31,285
Posted By buffalobillpatrick
Arduino R290 Suction Line Superheat Calc.

Some Arduino code that calculates Suction Line Superheat for R290 (propane)

Saturation Temp / Pressure table:

HC-290 (PROPANE) PRESSURE - TEMPERATURE CHART...
Showing results 1 to 18 of 18

 
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