Forum: Geothermal & Heat Pumps
12-30-14, 03:16 AM
|
|
Replies: 331
Views: 166,038
flow sensor
I'm using a flow sensor for one year now in my heatpump. It was running end of last winter, for one month during summer (for cooling). Was stopped for monthes. It was running from mid October,...
|
|
Forum: Geothermal & Heat Pumps
11-21-14, 01:50 AM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
11-20-14, 01:44 AM
|
|
Replies: 331
Views: 166,038
floats and 1w temp sensors
In my hetpump controller sw I use long and float operations alot. In such application the speed of the uC is plenty to waste for emulated floating point operations. Even there are several frequent...
|
|
Forum: Geothermal & Heat Pumps
11-12-14, 03:11 AM
|
|
Replies: 5
Views: 4,226
|
|
Forum: Geothermal & Heat Pumps
11-01-14, 04:09 AM
|
|
Replies: 82
Views: 70,804
In general it's possible to use VFD to drive...
In general it's possible to use VFD to drive permanent magnet brushless motor. However it is not ideal and not designed for. You should be very careful with settings. I sucesfully run a BLDC fan...
|
|
Forum: Geothermal & Heat Pumps
10-31-14, 03:49 AM
|
|
Replies: 13
Views: 10,919
Attached a picture from today morning after a...
Attached a picture from today morning after a foggy night. Temperature was at 0°C and from 3:00am slightly below freezing. The machine was heating my house all night alone. No forced defrost at...
|
|
Forum: Geothermal & Heat Pumps
10-30-14, 09:59 AM
|
|
Replies: 19
Views: 11,232
It is banned for heating or AC applications in...
It is banned for heating or AC applications in EU. It is allowed for cooling purposes indoors, with limitations.
Stupid thing, it is allowed to use even the 11kg propane-butan gas tank for heating...
|
|
Forum: Geothermal & Heat Pumps
10-30-14, 03:58 AM
|
|
Replies: 19
Views: 11,232
Hi,
My compressor is a Matsu****a 4ps164...
Hi,
My compressor is a Matsu****a 4ps164 it's a 2,7kW output unit salvaged from a mini-split AC. The evaporator is from the same AC. As it was a dual unit with two separate compressors and...
|
|
Forum: Geothermal & Heat Pumps
10-30-14, 03:15 AM
|
|
Replies: 13
Views: 10,919
Hi,
Frosting is a big issue with ASHP....
Hi,
Frosting is a big issue with ASHP. Unfortunately dehumidifiers are not a good candidates for conversion if one keeps the original evaporators.
In oposition to an ASHP, in a dehumidifier is...
|
|
Forum: Geothermal & Heat Pumps
10-29-14, 09:29 AM
|
|
Replies: 19
Views: 11,232
my ASHP status report
Hi,
As weather turned to be colder recently, I started my ASHP to heat my house. In the background, there is the NG boiler as automatic backup, but until now, it was not in use.:-)
I had some...
|
|
Forum: Geothermal & Heat Pumps
09-10-14, 12:36 AM
|
|
Replies: 331
Views: 166,038
cheap flow sensor
I have two of the mentioned cheap flow sensors installed. One is in operation (mean heavy waterflow) a lot of times a day. The other one stands for half year (in my heatpump) and in operation gets...
|
|
Forum: Geothermal & Heat Pumps
09-01-14, 03:02 PM
|
|
Replies: 78
Views: 33,033
HP dryer performance data
We bought a Gorenje HP dryer recently. I took some measurements today with 5kg (11lbs) of wet clothes, spinned out on 1400rpm.
The dryer consumed 0,6kWh of energy, finished in 45min, max. power draw...
|
|
Forum: Geothermal & Heat Pumps
08-01-14, 02:53 AM
|
|
Replies: 82
Views: 70,804
|
|
Forum: Geothermal & Heat Pumps
07-31-14, 04:25 PM
|
|
Replies: 82
Views: 70,804
"For the defrost i can shut the unit of wait a...
"For the defrost i can shut the unit of wait a few minutes switch the valve and then turn it back on? would this be a safe approach?"
No! The problem is not with timing. In reverse flow there is...
|
|
Forum: Geothermal & Heat Pumps
07-31-14, 02:50 PM
|
|
Replies: 82
Views: 70,804
As long as you don't reverse the cycle it looks...
As long as you don't reverse the cycle it looks ok.
Because of the small difference between outdoor temp and evaporated refrigerant temp I have the assumption you have nice big superheat. It's not...
|
|
Forum: Geothermal & Heat Pumps
07-31-14, 02:19 PM
|
|
Replies: 82
Views: 70,804
You should connect your blue gauge to the...
You should connect your blue gauge to the compressor suction line (where you indicated 25° on your drawing). For superheat calculation you need the pressure from there. The pressure at the current...
|
|
Forum: Geothermal & Heat Pumps
07-31-14, 08:57 AM
|
|
Replies: 82
Views: 70,804
Wait a moment with defrosting! :eek:
Do you have any metering device (capillary tube, txv, whatever) towards the BPHX for reverse operation during defrosting? If not, in defrost operation you you will flood your evaporator (BPHX) and...
|
|
Forum: Geothermal & Heat Pumps
07-28-14, 04:29 AM
|
|
Replies: 331
Views: 166,038
buffalobillpatrick,
Nice, simple code. If...
buffalobillpatrick,
Nice, simple code. If you don't mind, I would share with you my complains strictly from remidial intent.
- As you handle strings, you will exhaust RAM very fast. All strings...
|
|
Forum: Geothermal & Heat Pumps
07-23-14, 01:54 AM
|
|
Replies: 8
Views: 5,525
Hi,
The use of 3phase AC motors is a small...
Hi,
The use of 3phase AC motors is a small step towards higher efficiency.
One problem, if you run a motor with VFD on 100% it is less efficient than the single phase counterpart. This is due...
|
|
Forum: Geothermal & Heat Pumps
07-16-14, 05:32 AM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
07-16-14, 05:16 AM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
07-15-14, 01:56 PM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
07-13-14, 03:41 PM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
07-13-14, 03:36 PM
|
|
Replies: 331
Views: 166,038
|
|
Forum: Geothermal & Heat Pumps
07-12-14, 08:39 AM
|
|
Replies: 331
Views: 166,038
AC,
With the smallest sufficient DC cap, the...
AC,
With the smallest sufficient DC cap, the arduino can survive few hundred ms without power. I have never tried, but read in a book, the compressor can stop, or at least slows down so much, it...
|
