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 always take temperature readings with my IR gun on the floor, left wall, right wall and back of the fridge and average them out.
Yesterday, I received my new 40x20mm mm 6.3 CFM 0.03amp interior fan, and last night I removed the old one (40x10mm, 4.6 cfm, 0.07amps) from the freezer to move the quick connector to the new fan.
Average temp readings were 37.5 degrees in the fridge at that time with the dial set at 2 of 7.
I did not swap out the connector last night, and did not move the T stat dial. The fridge ran all night without an interior fan.
This morning, 10+ hours after I last opened the door, I opened it, and it just did not feel very cold to my hand. I took readings with my IR thermometer. While the floor was 35f directly under the coldplate, the left wall was 43f, the right wall was 44f, and the back wall was 46.5f . The nearly full gallon of milk was 41.5f
At this point I turned the dial up to ~3.5 from 2 and started my day.
A few hours later, in 75f ambients after several door openings to make breakfast and lunch, the floor was 30.5f, left wall 36f, right wall 37.5f, back wall 41f, the milk was 39f.
Later, I soldered the old connector onto the new Fan, and placed it in the freezer section and did not touch the dial. In one hour the floor was 32.5f, left wall 34.5f, right wall 35f, back wall 37.5f, the milk was 38f.
I then dialed the T stat back to 2.2 out of 7 from 3.5. Right now, 8 hours after dialing back to 2.2, at 61f ambient, it is running 5:25 on and 24:47 off. Floor 34.5f, left wall 35f, Right wall 35.5f, back wall 37.5f, milk 37f, I just turned it back to 2 of 7.
I will probably crank up the dial some when I remember to after the solar has topped off the batteries, then back down to 2 at night. This really seems to lower duty cycle significantly at night.
This is the third time that removing/ disconnecting the interior fan from the freezer section has had similar results in this fridge. Perhaps if I were to crank up the dial without the fan to achieve the same low temps as with it, the overall amp consumption might rise slightly in comparison. I don't care. The contents are colder for a lesser setting on the dial, and the interior temps are more consistent. Any food placed within will cool down quicker Also, I can better take advantage of the the extra solar amps after the batteries reach full charge, to cool the contents quicker down to the low 30's and then use less amps overnight when I turn the dial back to normal levels late afternoon, and let the box temps slowly approach the high 30's overnight.
Yesterday, I received my new 40x20mm mm 6.3 CFM 0.03amp interior fan, and last night I removed the old one (40x10mm, 4.6 cfm, 0.07amps) from the freezer to move the quick connector to the new fan.
Average temp readings were 37.5 degrees in the fridge at that time with the dial set at 2 of 7.
I did not swap out the connector last night, and did not move the T stat dial. The fridge ran all night without an interior fan.
This morning, 10+ hours after I last opened the door, I opened it, and it just did not feel very cold to my hand. I took readings with my IR thermometer. While the floor was 35f directly under the coldplate, the left wall was 43f, the right wall was 44f, and the back wall was 46.5f . The nearly full gallon of milk was 41.5f
At this point I turned the dial up to ~3.5 from 2 and started my day.
A few hours later, in 75f ambients after several door openings to make breakfast and lunch, the floor was 30.5f, left wall 36f, right wall 37.5f, back wall 41f, the milk was 39f.
Later, I soldered the old connector onto the new Fan, and placed it in the freezer section and did not touch the dial. In one hour the floor was 32.5f, left wall 34.5f, right wall 35f, back wall 37.5f, the milk was 38f.
I then dialed the T stat back to 2.2 out of 7 from 3.5. Right now, 8 hours after dialing back to 2.2, at 61f ambient, it is running 5:25 on and 24:47 off. Floor 34.5f, left wall 35f, Right wall 35.5f, back wall 37.5f, milk 37f, I just turned it back to 2 of 7.
I will probably crank up the dial some when I remember to after the solar has topped off the batteries, then back down to 2 at night. This really seems to lower duty cycle significantly at night.
This is the third time that removing/ disconnecting the interior fan from the freezer section has had similar results in this fridge. Perhaps if I were to crank up the dial without the fan to achieve the same low temps as with it, the overall amp consumption might rise slightly in comparison. I don't care. The contents are colder for a lesser setting on the dial, and the interior temps are more consistent. Any food placed within will cool down quicker Also, I can better take advantage of the the extra solar amps after the batteries reach full charge, to cool the contents quicker down to the low 30's and then use less amps overnight when I turn the dial back to normal levels late afternoon, and let the box temps slowly approach the high 30's overnight.
