Wiring a refridgerator vent fan
I've been fighting the fresh food temperatures in a Dometic 1350 refridgerator which is located in a slide out. My question is where should I hook the wires up to power a 12 volt fan blowing out in ...
Forum Discussion
A member here, Pianotuna, has recently added an internal fridge fan and lowered internal temps by 5 degrees and subsequently lowered the T-stat setting needed to maintain that lower temperature on hius absorption fridge
I employ a small 40mm Sunon 0.03 amp ~6cfm fan inside my 1.8 cubic foot compressor fridge and notice similar benefits. At only 0.03amps I leave it to run 24/7.
External fans should not be needed with a well setup absorption fridge in non extreme ambient temps. Well set up meaning not too much space behind the condenser, and a baffle so that normal convection currents cause adequate airflow over the condenser. I've seen links on this forum to diagrams of proper condenser airflow on absorption fridges, but cannot find them now. Perhaps somebody has the link bookmarked.
You can add a snap switch which will activate the fans at 110f and turn them off at 90f:
http://www.emersonclimate.com/en-US/products/products_a_z/furnace_ignition_control_gas_valve_ignitor_thermocouple/Pages/snap_disc_fan_and_limit_controls.aspx
Do note that while many will lump all these computer fans together, they actually vary extremely widely in their performance. Some make very little noise and move a respectable amount of air for little electricity consumed. Others, not so much.
Do note that Sleeve bearing fans, the cheapoes, do not last long in a horizontal position. You want dual ball bearing or fluid dynamic bearings in this orientation.
If you do not want to worry about a temperature snap switch, or do not really have a concern about a 0.05 amp draw, this fan moves 53cfm for 0.05 amps and is very quiet doing so.
This is the fan I have put onto my compressor fridges condenser, pushing air instead of pulling it, and it draws half the electricity as the provided fan, makes less than half the noise, and has a high static pressure rating, so the condenser's restriction in front of the fan blades is of little consequence, and fridge performance improved after this modification.
http://www.noctua.at/pdf/infosheets/noctua_nf_f12_focused_flow_web.pdf
Make a shroud so that all the air moved from the fan blades is expelled out the roof, and your fridge will behave better. IMO, too many people go through the motions of adding a fan, without optimizing the benefits from doing so. Positive displacement so no preheated air is recycled = Huge benefits.
I employ a small 40mm Sunon 0.03 amp ~6cfm fan inside my 1.8 cubic foot compressor fridge and notice similar benefits. At only 0.03amps I leave it to run 24/7.
External fans should not be needed with a well setup absorption fridge in non extreme ambient temps. Well set up meaning not too much space behind the condenser, and a baffle so that normal convection currents cause adequate airflow over the condenser. I've seen links on this forum to diagrams of proper condenser airflow on absorption fridges, but cannot find them now. Perhaps somebody has the link bookmarked.
You can add a snap switch which will activate the fans at 110f and turn them off at 90f:
http://www.emersonclimate.com/en-US/products/products_a_z/furnace_ignition_control_gas_valve_ignitor_thermocouple/Pages/snap_disc_fan_and_limit_controls.aspx
Do note that while many will lump all these computer fans together, they actually vary extremely widely in their performance. Some make very little noise and move a respectable amount of air for little electricity consumed. Others, not so much.
Do note that Sleeve bearing fans, the cheapoes, do not last long in a horizontal position. You want dual ball bearing or fluid dynamic bearings in this orientation.
If you do not want to worry about a temperature snap switch, or do not really have a concern about a 0.05 amp draw, this fan moves 53cfm for 0.05 amps and is very quiet doing so.
This is the fan I have put onto my compressor fridges condenser, pushing air instead of pulling it, and it draws half the electricity as the provided fan, makes less than half the noise, and has a high static pressure rating, so the condenser's restriction in front of the fan blades is of little consequence, and fridge performance improved after this modification.
http://www.noctua.at/pdf/infosheets/noctua_nf_f12_focused_flow_web.pdf
Make a shroud so that all the air moved from the fan blades is expelled out the roof, and your fridge will behave better. IMO, too many people go through the motions of adding a fan, without optimizing the benefits from doing so. Positive displacement so no preheated air is recycled = Huge benefits.
