Quote:
Originally Posted by Vlad
Very cool project. Just like AC made Heat pump from junk......
Just few things to add:
1 You can distill propane like I did. It is very easy just like making vodka. Old Russian tradition.
a. I put propane tank in freezer overnight. Low temperature will keep many additives frozen or liquid.
b. I connected refrigerant recovery unit and started pulling vapor propane from tank. Evaporating propane will keep tank even colder.
c. I used filter drier before recovery unit. There are some filters driers with male/female flares.
d. Condense propane to second tank.
After this I got odorless propane. I checked it's pressure/temperature looks just like R290.
2 You can connect condenser and evaporator in series to make bigger evaporator. This will help to get better COP but this won't change system capacity. System capacity is a compressor size. I do understand that better COP= more BTU output and kinda more capacity but this doesn't affect much.
3 For defrost you only need off-cycle defrost which is compressor off and fan on. Warm air will melt the ice. You need to figure out timing. Just experiment.
4 To get better COP you need to keep water temperature as close as possible to air temperature. Sounds stupid but this is reality. The best way is to have 2 water tanks one is preheater with heat pump and the other is electric or gas to heat and store hot water at safe temperature 140F (Legionella ).
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I'll have to try your distilling method.
The condenser and evaporator are looped together.
I've actually never heard of Legionella. The government here recommends keeping your water heater under 125deg f to prevent scaulding and to save energy. My geospring heater makes me confirm I want to go over 120deg and warns me of scaulding before allowing me to do it. I've always kept it set at 120deg for the energy savings.
Hv23t