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Old 12-23-15, 09:20 PM   #181
MEMPHIS91
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Bi-directional flow txvs. Why do I need check valves if these can flow backwards?
I saw a unit today that did heating and cooling. Not a single check valve in the system. Not even a bypass loop or anything.
Are most txvs bi-directional?

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Old 12-23-15, 11:37 PM   #182
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Quote:
Originally Posted by MEMPHIS91 View Post
Bi-directional flow txvs. Why do I need check valves if these can flow backwards?
I saw a unit today that did heating and cooling. Not a single check valve in the system. Not even a bypass loop or anything.
Are most txvs bi-directional?
Some tx valves have a built-in check valve. When they see reverse pressure, the check valve opens and lets the liquid through without dropping much pressure at all. You still need one for each heat exchanger, though. Electronic expansion valves are naturally bidirectional and don't need a check valve. The unit will have thermometer sensors on each hx to let the controller know what they are doing.
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Old 12-25-15, 09:28 AM   #183
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Ah ok that makes sense. So I misunderstood about what size check valve you said. You said liquid line, my mind instantly heard suction line. So I was think 7/8 but that is wrong. The liquid line is going to be 1/2", so I will grab a couple of them off ebay. I now have 2 of these balanced port txvs. NEW Carrier Bryant Payne A Coil TXV Valve Kit KSATX0701HSO FREE SHIPPING!

It is a 2 - 4 ton range txv. They are both externally equalized but that is ok, I really really liked them.
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Old 12-25-15, 03:27 PM   #184
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Also I just checked the water temp in the pond again, it has dropped to 48F........ That doesn't make much sense to me. Right now I have a general 2 wire aquarium thermometer running 170 feet into the pond. Something tells me that the long long wire is cause some issues. I will finish building the one wire arduino and test again.
But that did have me thinking, what temp is too low? I was thinking anything over 40F and more water flow could heat the house pretty good.
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Old 12-28-15, 09:21 PM   #185
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interesting video on vfds. he has a few more and even one with a 3 phase running his heat pump. thought it might help you in your vfd experiment

https://youtu.be/WT_2P7WdKzw
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Old 01-23-16, 07:12 PM   #186
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Hey guys been busy with the greenhouse heater and insulation that this project is being slow.
Here are the data logger readings from the bottom of the pond. The low is the past few days of no sun and snow. That is a once or twice a year thing here, I believe it is safe to say the 40F is as cold as the pond is going to get.
So the geothermal is still a go!
PHP Code:
 RC-5 Data Logger

User Information              RC
-5 Data Logger
Number                        001       
Interval                      1
:0:0 H:M:S
Delay Time                    0.0 H
Data Sum                      222
TemperatureMaximum            89.1°F
TemperatureMinimum            40.8°F
TemperatureAverage            44.1°F
TemperatureAlarm Upper Limit  140.0°F
TemperatureAlarm Lower Limit  
-22.0°F
Start Time                    2012
-01-01 23:47:22
End Time                      2012
-01-11 04:47:22
Date Format                   yyyy
-MM-dd HH:mm:ss
Temperature Unit              °F

Number            Time            Temperature°F
1        2012
-01-01 23:47:22        89.1
2        2012
-01-02 00:47:22        45.1
3        2012
-01-02 01:47:22        45.1
4        2012
-01-02 02:47:22        45.1
5        2012
-01-02 03:47:22        45.1
6        2012
-01-02 04:47:22        45.1
7        2012
-01-02 05:47:22        45.1
8        2012
-01-02 06:47:22        45.1
9        2012
-01-02 07:47:22        45.1
10        2012
-01-02 08:47:22        45.1
11        2012
-01-02 09:47:22        45.1
12        2012
-01-02 10:47:22        45.1
13        2012
-01-02 11:47:22        45.1
14        2012
-01-02 12:47:22        45.3
15        2012
-01-02 13:47:22        45.3
16        2012
-01-02 14:47:22        45.1
17        2012
-01-02 15:47:22        45.3
18        2012
-01-02 16:47:22        45.3
19        2012
-01-02 17:47:22        45.3
20        2012
-01-02 18:47:22        45.3
21        2012
-01-02 19:47:22        45.3
22        2012
-01-02 20:47:22        45.3
23        2012
-01-02 21:47:22        45.3
24        2012
-01-02 22:47:22        45.3
25        2012
-01-02 23:47:22        45.3
26        2012
-01-03 00:47:22        45.5
27        2012
-01-03 01:47:22        45.5
28        2012
-01-03 02:47:22        45.5
29        2012
-01-03 03:47:22        45.3
30        2012
-01-03 04:47:22        45.3
31        2012
-01-03 05:47:22        45.3
32        2012
-01-03 06:47:22        45.3
33        2012
-01-03 07:47:22        45.5
34        2012
-01-03 08:47:22        45.5
35        2012
-01-03 09:47:22        45.5
36        2012
-01-03 10:47:22        45.5
37        2012
-01-03 11:47:22        45.5
38        2012
-01-03 12:47:22        45.5
39        2012
-01-03 13:47:22        45.5
40        2012
-01-03 14:47:22        45.5
41        2012
-01-03 15:47:22        45.5
42        2012
-01-03 16:47:22        45.5
43        2012
-01-03 17:47:22        45.5
44        2012
-01-03 18:47:22        45.5
45        2012
-01-03 19:47:22        45.5
46        2012
-01-03 20:47:22        45.5
47        2012
-01-03 21:47:22        45.5
48        2012
-01-03 22:47:22        45.5
49        2012
-01-03 23:47:22        45.5
50        2012
-01-04 00:47:22        45.5
51        2012
-01-04 01:47:22        45.5
52        2012
-01-04 02:47:22        45.5
53        2012
-01-04 03:47:22        45.5
54        2012
-01-04 04:47:22        45.5
55        2012
-01-04 05:47:22        45.5
56        2012
-01-04 06:47:22        45.5
57        2012
-01-04 07:47:22        45.5
58        2012
-01-04 08:47:22        45.7
59        2012
-01-04 09:47:22        45.7
60        2012
-01-04 10:47:22        45.7
61        2012
-01-04 11:47:22        45.7
62        2012
-01-04 12:47:22        45.7
63        2012
-01-04 13:47:22        45.7
64        2012
-01-04 14:47:22        45.7
65        2012
-01-04 15:47:22        45.7
66        2012
-01-04 16:47:22        45.7
67        2012
-01-04 17:47:22        45.7
68        2012
-01-04 18:47:22        45.7
69        2012
-01-04 19:47:22        45.5
70        2012
-01-04 20:47:22        45.5
71        2012
-01-04 21:47:22        45.5
72        2012
-01-04 22:47:22        45.7
73        2012
-01-04 23:47:22        45.5
74        2012
-01-05 00:47:22        45.7
75        2012
-01-05 01:47:22        45.7
76        2012
-01-05 02:47:22        45.7
77        2012
-01-05 03:47:22        45.7
78        2012
-01-05 04:47:22        45.7
79        2012
-01-05 05:47:22        45.7
80        2012
-01-05 06:47:22        45.7
81        2012
-01-05 07:47:22        45.7
82        2012
-01-05 08:47:22        45.7
83        2012
-01-05 09:47:22        45.7
84        2012
-01-05 10:47:22        45.7
85        2012
-01-05 11:47:22        45.7
86        2012
-01-05 12:47:22        45.7
87        2012
-01-05 13:47:22        45.7
88        2012
-01-05 14:47:22        45.7
89        2012
-01-05 15:47:22        45.5
90        2012
-01-05 16:47:22        45.5
91        2012
-01-05 17:47:22        45.5
92        2012
-01-05 18:47:22        45.5
93        2012
-01-05 19:47:22        45.3
94        2012
-01-05 20:47:22        45.1
95        2012
-01-05 21:47:22        45.1
96        2012
-01-05 22:47:22        45
97        2012
-01-05 23:47:22        45
98        2012
-01-06 00:47:22        45.1
99        2012
-01-06 01:47:22        45.1
100        2012
-01-06 02:47:22        45.1
101        2012
-01-06 03:47:22        45.1
102        2012
-01-06 04:47:22        45.1
103        2012
-01-06 05:47:22        45
104        2012
-01-06 06:47:22        45
105        2012
-01-06 07:47:22        44.8
106        2012
-01-06 08:47:22        44.6
107        2012
-01-06 09:47:22        44.6
108        2012
-01-06 10:47:22        44.4
109        2012
-01-06 11:47:22        44.2
110        2012
-01-06 12:47:22        44.2
111        2012
-01-06 13:47:22        44.1
112        2012
-01-06 14:47:22        43.7
113        2012
-01-06 15:47:22        43.7
114        2012
-01-06 16:47:22        43.7
115        2012
-01-06 17:47:22        43.5
116        2012
-01-06 18:47:22        43.5
117        2012
-01-06 19:47:22        43.5
118        2012
-01-06 20:47:22        43.5
119        2012
-01-06 21:47:22        43.3
120        2012
-01-06 22:47:22        43.2
121        2012
-01-06 23:47:22        43.2
122        2012
-01-07 00:47:22        43.3
123        2012
-01-07 01:47:22        43.3
124        2012
-01-07 02:47:22        43.3
125        2012
-01-07 03:47:22        43.3
126        2012
-01-07 04:47:22        43.3
127        2012
-01-07 05:47:22        43.3
128        2012
-01-07 06:47:22        43.3
129        2012
-01-07 07:47:22        43.3
130        2012
-01-07 08:47:22        43.2
131        2012
-01-07 09:47:22        43
132        2012
-01-07 10:47:22        42.8
133        2012
-01-07 11:47:22        42.6
134        2012
-01-07 12:47:22        42.6
135        2012
-01-07 13:47:22        42.4
136        2012
-01-07 14:47:22        42.3
137        2012
-01-07 15:47:22        42.4
138        2012
-01-07 16:47:22        42.4
139        2012
-01-07 17:47:22        42.4
140        2012
-01-07 18:47:22        42.4
141        2012
-01-07 19:47:22        42.4
142        2012
-01-07 20:47:22        42.6
143        2012
-01-07 21:47:22        42.6
144        2012
-01-07 22:47:22        42.6
145        2012
-01-07 23:47:22        42.6
146        2012
-01-08 00:47:22        42.4
147        2012
-01-08 01:47:22        42.4
148        2012
-01-08 02:47:22        42.6
149        2012
-01-08 03:47:22        42.6
150        2012
-01-08 04:47:22        42.6
151        2012
-01-08 05:47:22        42.6
152        2012
-01-08 06:47:22        42.6
153        2012
-01-08 07:47:22        42.6
154        2012
-01-08 08:47:22        42.6
155        2012
-01-08 09:47:22        42.6
156        2012
-01-08 10:47:22        42.8
157        2012
-01-08 11:47:22        42.6
158        2012
-01-08 12:47:22        42.6
159        2012
-01-08 13:47:22        42.6
160        2012
-01-08 14:47:22        42.6
161        2012
-01-08 15:47:22        42.6
162        2012
-01-08 16:47:22        42.6
163        2012
-01-08 17:47:22        42.6
164        2012
-01-08 18:47:22        42.6
165        2012
-01-08 19:47:22        42.6
166        2012
-01-08 20:47:22        42.8
167        2012
-01-08 21:47:22        42.8
168        2012
-01-08 22:47:22        42.8
169        2012
-01-08 23:47:22        42.8
170        2012
-01-09 00:47:22        43
171        2012
-01-09 01:47:22        43
172        2012
-01-09 02:47:22        43
173        2012
-01-09 03:47:22        43
174        2012
-01-09 04:47:22        43.3
175        2012
-01-09 05:47:22        43.3
176        2012
-01-09 06:47:22        43.3
177        2012
-01-09 07:47:22        43.5
178        2012
-01-09 08:47:22        43.2
179        2012
-01-09 09:47:22        42.8
180        2012
-01-09 10:47:22        43
181        2012
-01-09 11:47:22        43
182        2012
-01-09 12:47:22        43
183        2012
-01-09 13:47:22        43.2
184        2012
-01-09 14:47:22        43.2
185        2012
-01-09 15:47:22        43.3
186        2012
-01-09 16:47:22        42.8
187        2012
-01-09 17:47:22        42.6
188        2012
-01-09 18:47:22        42.4
189        2012
-01-09 19:47:22        42.4
190        2012
-01-09 20:47:22        42.4
191        2012
-01-09 21:47:22        41.9
192        2012
-01-09 22:47:22        42.1
193        2012
-01-09 23:47:22        42.1
194        2012
-01-10 00:47:22        42.3
195        2012
-01-10 01:47:22        42.3
196        2012
-01-10 02:47:22        42.1
197        2012
-01-10 03:47:22        42.1
198        2012
-01-10 04:47:22        42.1
199        2012
-01-10 05:47:22        42.1
200        2012
-01-10 06:47:22        42.1
201        2012
-01-10 07:47:22        41.9
202        2012
-01-10 08:47:22        41.7
203        2012
-01-10 09:47:22        41.7
204        2012
-01-10 10:47:22        41.5
205        2012
-01-10 11:47:22        41.5
206        2012
-01-10 12:47:22        41.4
207        2012
-01-10 13:47:22        41.4
208        2012
-01-10 14:47:22        41.2
209        2012
-01-10 15:47:22        41.2
210        2012
-01-10 16:47:22        41
211        2012
-01-10 17:47:22        41
212        2012
-01-10 18:47:22        41
213        2012
-01-10 19:47:22        40.8
214        2012
-01-10 20:47:22        40.8
215        2012
-01-10 21:47:22        41
216        2012
-01-10 22:47:22        40.8
217        2012
-01-10 23:47:22        40.8
218        2012
-01-11 00:47:22        41
219        2012
-01-11 01:47:22        41
220        2012
-01-11 02:47:22        41
221        2012
-01-11 03:47:22        41
222        2012
-01-11 04:47:22        41 
I forgot to set the clock on it. The last temp taken was really 1/23/16 at 6 pm
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Old 01-23-16, 09:37 PM   #187
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No big rush here. Since you have developed the greenhouse system, which is fully dx outdoors, that's the best place to reap some heating rewards and collect data. Odds are high that the performance of this pump and dump system will mimic the dx system overall.
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Old 01-24-16, 08:10 AM   #188
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Memphis,

I see you are using one of those inexpensive ($15) RC-5 temperature/time data loggers. The reviews are mixed saying that the software interface is a bear. Some say impossible to use. Others love them. What to believe . . .

I am thinking of ordering them to use to evaluate home heating system % on and off times (an indicator of system efficiency). Looks like you can set out one in a duct box, set it for one minute data collection and get a weeks worth of data for on and off heating times.

Thanks in advance. Always best to get a review from a REAL person and not the contrived reviews found on e-bay or Amazon.

Steve
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Old 01-24-16, 12:07 PM   #189
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These things are awesome! I got 3, they could not be easier to use. Just don't forget to erase the data each time because it will NOT write over data. Also every time to plug it into the computer it sets the clock.
Its easy to set the recording time and interval. Then just put the battery in and hit the play button.

I double bag them and drop them to the bottom of the pond on a piece of 3/4" pvc. I have left them for over a week with zero water damage. I wouldn't put them in water without a bag or two on them though.

I needed either this or some logger with a long wire. I couldn't find one, so this is the route I went, and I'm sure glad I did.

BTW, amazon said it did not come with a battery, but mine did.
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Old 01-24-16, 12:48 PM   #190
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Thanks for the review - just ordered it on Amazon Prime. May be knocking on your "door" for help with software.

Looks like the actual unit is excellent - it is the software and/or download that people hate . . .

If it works like they say, it will be an excellent tool.


Steve

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consulting on geothermal heating/cooling & rational energy use since 1990
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