01-12-12, 05:10 PM | #1071 | ||||||
Supreme EcoRenovator
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Far easier to handle... safer, too. Quote:
-AC_Hacker
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I'm not an HVAC technician. In fact, I'm barely even a hacker... |
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01-14-12, 07:29 AM | #1072 |
Lurking Renovator
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Marine Heat Pumps
Has anyone fiddled around with marine heat pumps for the DIY geothermal application?
They run at around $1500 for a 16000BTU unit. Thumper |
01-14-12, 07:30 AM | #1073 |
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Marine Heat Pumps
There are Flagship Marine units and |Marineair also has some.
Thumper |
01-14-12, 07:32 AM | #1074 |
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They all seem to have co-axial (coil in coil types) of heat exchangers.
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01-14-12, 07:34 AM | #1075 |
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I am currently working on a project for a shared lakehouse and the soil is 35-40 ft of pure sand (we use a sand point for our water year round). Water temp runs at a 48-50 deg F.
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01-14-12, 07:35 AM | #1076 |
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We are considering an open loop system as our water supply is inexhaustible and the soil drainage is excellent for return water.
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01-14-12, 07:38 AM | #1077 |
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Marine Heat Pumps
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01-14-12, 09:13 AM | #1078 |
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Those looks like air conditioners only and not heat pumps. The heat output kw is the same as heat input amps*volts. Not bad for an air conditioning setup I suppose but I'd figure water sourced cooling would give better than a 10-12 EER range(based on their amperage draw to BTU ratings). Considering they need to run off of a generator or outlet power when docked, it seems that the benefit is the small size of the unit.
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01-14-12, 10:09 AM | #1079 | ||||
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The web site you pointed us to states this: Quote:
Output = 18,500 BTU (cooling) Amps = 16.2 (cooling) Volts = 115 Amps * Volts = 1863 Watts (this is not exactly correct, but close) 1863 Watts = (1863 x 3.412) = 6357 BTU COP = (output / input) = (18500 / 6357) = 2.91 So this unit will give you almost 3 times the power advantage, not 1 to 1 as MN Renovator stated. The same table does not give a value for heat output, but because the heat from the compressor ultimately is part of the output, the COP in heating mode will be higher than the COP for cooling mode. Curiously the same web site also says this: Quote:
So, while a unit like this would be useful. I have seen ready-made commercial units intended for use in terrestrial homes at a lower price, and because space is not such an issue as it would be aboard a boat, the parts are placed such that servicing would be easier. But in regards to hacking a unit, why would you want to buy one of these systems when you could build one from parts avail from discarded air conditioner and de-humidifiers at a much lower price? I think the only thing thing that could justify one of these systems is that you can get one for cheap or free. Another advantage to hacking your own unit is that in addition to saving money, you will learn more and have fun. And of course, bragging rights come with the territory... Regards, -AC_Hacker
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I'm not an HVAC technician. In fact, I'm barely even a hacker... Last edited by AC_Hacker; 01-14-12 at 10:20 AM.. |
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01-14-12, 01:18 PM | #1080 |
Less usage=Cheaper bills
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"MN Renovator's comment is not correct."
Model FM12R KW of elec. heat 1.7kw 8.9amps*230v=2047 watts Are you sure? The numbers don't seem to add up but they aren't putting in the BTUs of heating either but 1700watts of heat output would be 5800BTU. If it produced the same amount of heat as it would cold, it would be a COP of a little over 2 but they aren't claiming that anywhere. Last edited by MN Renovator; 01-14-12 at 01:20 PM.. |
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air conditioner, diy, gshp, heat pump, homemade |
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