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Forum: Geothermal & Heat Pumps 06-04-14, 03:16 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
You can attach a temperature sensor to the cold...

You can attach a temperature sensor to the cold water inlet (a few inches from the exchanger) and start the pumps when there's a drop in temperature. Try to arrange it so that the exchanger is right...
Forum: Geothermal & Heat Pumps 06-04-14, 02:07 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
If you use a heat exchanger to directly supply...

If you use a heat exchanger to directly supply DHW, you can keep the temperature much lower.
Forum: Geothermal & Heat Pumps 06-03-14, 05:19 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
It should be horizontal with the liquid end...

It should be horizontal with the liquid end facing down for the condenser and the vapor end facing up for the evaporator.
Forum: Geothermal & Heat Pumps 06-03-14, 12:55 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Both the plate exchangers and (especially) the...

Both the plate exchangers and (especially) the coax coils are going to have negligible pressure drop across them.
Forum: Geothermal & Heat Pumps 03-26-14, 08:26 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
If you do get a hard start kit, the 5-2-1 (or any...

If you do get a hard start kit, the 5-2-1 (or any based on a potential relay) would be your best bet. It's unlikely you'll actually need one as R290 would mean less pressure to start against....
Forum: Geothermal & Heat Pumps 03-25-14, 08:24 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
TXV defaults to full open with no pressure...

TXV defaults to full open with no pressure applied.
Forum: Geothermal & Heat Pumps 03-25-14, 08:41 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
With a TXV, the condensing temperature would have...

With a TXV, the condensing temperature would have to drop very low before the system starts having problems. Aside from that, picking the flow rate is a tradeoff between trying to maintain...
Forum: Geothermal & Heat Pumps 03-24-14, 07:05 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
So it's basically a head pressure control for...

So it's basically a head pressure control for heating mode. You can minimize the efficiency loss by leaving some of the bottom rows unblocked. The head pressure will still increase as desired but the...
Forum: Geothermal & Heat Pumps 03-24-14, 09:27 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
That will net a lower efficiency unless you're...

That will net a lower efficiency unless you're dealing with a cap tube system that won't operate properly with too low of a condensing temperature. And that would be nowhere as efficient as doing it...
Forum: Geothermal & Heat Pumps 03-23-14, 10:46 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
You'll want to have a PID loop controlling the...

You'll want to have a PID loop controlling the superheat, not just on off. The amount of heat needed to "shift down" the superheat to the correct amount will depend on many factors.
Forum: Geothermal & Heat Pumps 03-23-14, 02:57 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
In your case, it would be much more efficient to...

In your case, it would be much more efficient to use recirculation than auxiliary heaters. Your heat pump is going to be nearly 4 times as efficient as the auxiliary heaters. Also, the heat "lost" in...
Forum: Geothermal & Heat Pumps 03-23-14, 01:43 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Recirculation would actually be more efficient in...

Recirculation would actually be more efficient in your setup. Even more so when it's on demand.
Forum: Geothermal & Heat Pumps 03-22-14, 09:40 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
It's running the emulator "behind the...

It's running the emulator "behind the scenes".
Forum: Geothermal & Heat Pumps 03-22-14, 09:28 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
The emulator lets the program run on a modern...

The emulator lets the program run on a modern 64-bit PC. It doesn't "emulate" per se as the CPU can still natively execute 32-bit, but the 32-bit calls from the program have to be translated to...
Forum: Geothermal & Heat Pumps 03-22-14, 03:34 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Coolpack. It's free and runs nicely with an...

Coolpack. It's free and runs nicely with an emulator.

At 50C (122F) condensing and 10C (50F) evaporating, expect about 3.78 COP (12.9 EER/14.7 SEER) and 64C (147F) discharge temperature. The SLHX...
Forum: Geothermal & Heat Pumps 03-22-14, 11:47 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Avoid threaded connections if possible. If you...

Avoid threaded connections if possible. If you must use them, only use Nylog as a sealant. You'll have to braze the fitting "dry" as the heat would degrade the sealant.
Forum: Geothermal & Heat Pumps 03-22-14, 10:39 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Threaded connections are hard to get 100%...

Threaded connections are hard to get 100% leakproof. You want brazed or flares as much as possible.
Forum: Geothermal & Heat Pumps 03-21-14, 10:41 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
You let the pressure out in a well ventilated...

You let the pressure out in a well ventilated area before you pull a vacuum.

The gauges are designed to withstand vacuum.

The oil does move with the refrigerant, but package units are small...
Forum: Geothermal & Heat Pumps 03-21-14, 09:45 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
That's *exactly* how I set up my set of gauges! ...

That's *exactly* how I set up my set of gauges!

When charging, you'll probably have to jump out the low pressure control. The reason is that until you have the correct charge in it, the low...
Forum: Geothermal & Heat Pumps 03-20-14, 11:06 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
TXV defaults to open. Suction pressure tries to...

TXV defaults to open. Suction pressure tries to close it, while bulb pressure tries to open it.
Forum: Geothermal & Heat Pumps 03-20-14, 07:57 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
I just noticed that you put the liquid side of...

I just noticed that you put the liquid side of the SLHX between the condenser and filter drier. It should go between the sight glass and TXV.
Forum: Geothermal & Heat Pumps 03-20-14, 01:45 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
That's good if it has the 1/4" fittings or can be...

That's good if it has the 1/4" fittings or can be adapted. Blow it out with nitrogen to remove any possible contamination.
Forum: Geothermal & Heat Pumps 03-20-14, 12:46 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
"Package unit" means that once assembled, the...

"Package unit" means that once assembled, the entire charge is inside the unit. Window units and rooftop units are common examples. Contrast that to split systems where the condenser and evaporator...
Forum: Geothermal & Heat Pumps 03-20-14, 12:09 PM
Replies: 293
Views: 107,505
Posted By NiHaoMike
"Package unit" means the entire refrigerant...

"Package unit" means the entire refrigerant charge is confined to the unit. As such, the amount of refrigerant is usually small enough that a crankcase heater is not necessary with a scroll.

You...
Forum: Geothermal & Heat Pumps 03-20-14, 08:19 AM
Replies: 293
Views: 107,505
Posted By NiHaoMike
Paintball nitrogen can be used if it's pure...

Paintball nitrogen can be used if it's pure enough, so can CO2 or argon (albeit more expensive). Try a welding shop since they'll have some pure enough for your use.
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