I have an idea for a gasoline powerd fridge, need input.

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SUMMARY

The discussion centers around a concept for a gasoline-powered refrigerator utilizing a 5HP engine with an electric starter. The design incorporates a coil thermostat and relays to automate the engine's startup process. Key components include a thermistor for safety, which disables the starter motor if it overheats, and diodes for battery management. The idea is proposed for outdoor use only due to the dangers of gas engines operating indoors.

PREREQUISITES
  • Understanding of basic thermodynamics and refrigeration principles
  • Familiarity with automotive electrical systems, including relays and solenoids
  • Knowledge of engine operation, particularly small gasoline engines
  • Experience with circuit design and safety mechanisms in electrical systems
NEXT STEPS
  • Research small engine mechanics, focusing on 5HP gasoline engines
  • Explore relay circuits and their applications in automotive systems
  • Learn about thermistors and their role in temperature control systems
  • Investigate safety protocols for operating gasoline engines outdoors
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and inventors interested in alternative refrigeration methods, as well as those exploring the integration of small engines in innovative applications.

masshuku
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So last night, a bit on the tipsy side, I drew this on paper(then in paint) and I don't see why It would not work. I'm not really an engineer so I'm not sure if there's some flaw in my logic.
The idea is based on a 5HP engine with an electric starter. It automatically starts the engine using a coil thermostat and some relays.
If people think it will work, ill go try to find the parts and stuff needed for cheap/free and build it.

I know a picture is worth a thousand words.
http://img215.imageshack.us/img215/3784/ideag.png


The symbols and such are sort of just off the top of my head, apart from 1 I got from wikipedia.

Basic rundown of how a startup occurs:

Thermostat gap closes, begins to power 2 relays. The first opens a kill switch(or closes it depending on how the engine operates) and the second powers the exciter on the alternator.

The current then runs through a third relay and into the starter solenoid, passing through a thermistor(to kill the starter motor if it runs to long, aka the thermistor warms up to much)

After the engine starts the output is run through 2 diodes, one goes back to the battery and the other goes to that third relay to cut power to the starter.


I could attach a second thermostat to the thermistor so that it kills the entire circuit until the thermistor cools down.
 
Last edited by a moderator:
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Sure, you could make a thermostat controlled start of a gas engine. But not the way you said.

But this is for outdoor use only, correct? Gas engines indoors are deadly.
 

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