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Search: Posts Made By: takyka
Forum: Geothermal & Heat Pumps 12-30-14, 03:16 AM
Replies: 331
Views: 86,503
Posted By takyka
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: 86,503
Posted By takyka
The arduino mega is a 5V device! As long as one...

The arduino mega is a 5V device! As long as one doesn't need computation power of 32bit systems, but for more pins or memory does, arduino mega can be a good choice.

Unlike some are thinking...
Forum: Geothermal & Heat Pumps 11-20-14, 01:44 AM
Replies: 331
Views: 86,503
Posted By takyka
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: 1,932
Posted By takyka
I have a temperature sensor attached between the...

I have a temperature sensor attached between the fins of the evaporator close to the intake and one at exhaust pipe end. When HP stops, The temperature start to rise at both. If there is frost at...
Forum: Geothermal & Heat Pumps 11-01-14, 04:09 AM
Replies: 82
Views: 43,783
Posted By takyka
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: 6,484
Posted By takyka
Attached a picture from today morning after a...

Attached a picture from today morning after a foggy night. Temperature was at 0C 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: 6,479
Posted By takyka
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: 6,479
Posted By takyka
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: 6,484
Posted By takyka
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: 6,479
Posted By takyka
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: 86,503
Posted By takyka
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: 15,815
Posted By takyka
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: 43,783
Posted By takyka
To be honest. I'm not professional, I don't know...

To be honest. I'm not professional, I don't know all type of split ACs. The models I have seen had separate capillary tube and check valve for heating and cooling. Also The book I'm used to learn...
Forum: Geothermal & Heat Pumps 07-31-14, 04:25 PM
Replies: 82
Views: 43,783
Posted By takyka
"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: 43,783
Posted By takyka
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: 43,783
Posted By takyka
Exclamation 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: 43,783
Posted By takyka
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: 86,503
Posted By takyka
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: 2,967
Posted By takyka
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: 86,503
Posted By takyka
You have on the UNO one serial port connected to...

You have on the UNO one serial port connected to USB converter. When you plug it to computer, it appears like a serial port. A simple terminal sw(built into arduino or an external one) can be used as...
Forum: Geothermal & Heat Pumps 07-16-14, 05:16 AM
Replies: 331
Views: 86,503
Posted By takyka
Professional systems pressure switches with...

Professional systems pressure switches with hysteresis are used. Adjustable or fixed connected in series with compressor.
Here is an example:...
Forum: Geothermal & Heat Pumps 07-15-14, 01:56 PM
Replies: 331
Views: 86,503
Posted By takyka
How important is to have LCD is up to the user's...

How important is to have LCD is up to the user's taste. If you have computeror tablet at hand, It's more convenient to get/set datas with it. In my system there is the possibility to connect LCD, but...
Forum: Geothermal & Heat Pumps 07-13-14, 03:41 PM
Replies: 331
Views: 86,503
Posted By takyka
Good move! You can't imagine, how much these...

Good move! You can't imagine, how much these helps to find the best COP.
Only thing, your simple controller is not that simple anymore! :D

T.
Forum: Geothermal & Heat Pumps 07-13-14, 03:36 PM
Replies: 331
Views: 86,503
Posted By takyka
It is not correct. Boiling point is related to...

It is not correct. Boiling point is related to pressure and temperature. But if you pass that point you can rise temperature for the wapor, without increasing pressure. Think about compressor...
Forum: Geothermal & Heat Pumps 07-12-14, 08:39 AM
Replies: 331
Views: 86,503
Posted By takyka
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...
Showing results 1 to 25 of 34

 
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