Increasing Airflow through Condenser.
The new DC only compressor fridge I will soon have in my possession has a 92 mm computer muffin fan pulling air through only a portion(~85%) of the ~120mm tall condenser. It then blows this warmed a...
Forum Discussion
I agree the Danfoss compressors will have little trouble if installed without enhanced airflow measures.
The Danfoss bd35f can power an 8 cubic foot fridge at max RPM IIRC, so this same compressor is coasting along powering my 1.8 cubic foot fridge.
I also feel that my unnecessary modifications have considerably added to the efficiency, and I am thoroughly impressed with its performance. In terms of battery consumption, noise, and interior temperatures.
People can choose for themselves whether they want to go through the effort of finding and installing a quieter, more efficient fan to replace whatever sleeve bearing fan fell within the broad specs at the time of assembly.
Whether more insulation and/or a cabinet recess which is optimized to bathe the condenser, compressor and controller in ambient air and evacuate the created heat is worth it. The fridge will still maintain sub 40f interior temps without them.
On many marine forums I visit it appears it was the earlier Danfoss compressor controllers which failed most often, and they were on units which used a sea water cooled condenser and had no forced airflow in the compressor/controller compartment. They since added a finned heatsink to the back of the compressor controller to help dissipate the heat generated by high duty cycles. This Controller costs about 250$ to replace.
Seems to me, the only one to profit from not taking any of these unnecessary measures, is someone who sells or services such units.
Anyone seeking to minimize battery consumption and has the skills to enhance heat removal, perhaps even without touching anything on the cooling unit itself, would be wise to do so, in my opinion.
Also the Cabinet should be designed so that one can easily remove dust hair dust and other detritus from the condenser fins and fan blades. I need to unscrew my fridge and slide it out to do so, but would build a new cabinet differently to accomplish this task easier if I were to start over.
Instead I am going to soon have a low restriction easily replaceable/ perhaps washable air filter on my intake which might eliminate the need to clean the detritus from condenser fins and fan blades.
The Danfoss bd35f can power an 8 cubic foot fridge at max RPM IIRC, so this same compressor is coasting along powering my 1.8 cubic foot fridge.
I also feel that my unnecessary modifications have considerably added to the efficiency, and I am thoroughly impressed with its performance. In terms of battery consumption, noise, and interior temperatures.
People can choose for themselves whether they want to go through the effort of finding and installing a quieter, more efficient fan to replace whatever sleeve bearing fan fell within the broad specs at the time of assembly.
Whether more insulation and/or a cabinet recess which is optimized to bathe the condenser, compressor and controller in ambient air and evacuate the created heat is worth it. The fridge will still maintain sub 40f interior temps without them.
On many marine forums I visit it appears it was the earlier Danfoss compressor controllers which failed most often, and they were on units which used a sea water cooled condenser and had no forced airflow in the compressor/controller compartment. They since added a finned heatsink to the back of the compressor controller to help dissipate the heat generated by high duty cycles. This Controller costs about 250$ to replace.
Seems to me, the only one to profit from not taking any of these unnecessary measures, is someone who sells or services such units.
Anyone seeking to minimize battery consumption and has the skills to enhance heat removal, perhaps even without touching anything on the cooling unit itself, would be wise to do so, in my opinion.
Also the Cabinet should be designed so that one can easily remove dust hair dust and other detritus from the condenser fins and fan blades. I need to unscrew my fridge and slide it out to do so, but would build a new cabinet differently to accomplish this task easier if I were to start over.
Instead I am going to soon have a low restriction easily replaceable/ perhaps washable air filter on my intake which might eliminate the need to clean the detritus from condenser fins and fan blades.
