I would like to make a proofing box, a piece of bakery equipment used control the environment of leavened dough while it rises.
The electronics part of my project is almost complete.
It has a temperature and humidity sensor. If the temperature goes below desired temperature it should energize the heater. I used a remote power socket and Arduino to control the heater. I may use an infrared bulb for heating.
Electronic components inside the box are an arduino pro mini 5V, DSTH01 digital temperature and humidity sensor, 433 MHz RF transmitter, 16x12 lcd screen, two leds, two resistors. There is also a power socket rated 240V AC 1200W. I also plan to put a pwm controlled Noctua 12V DC fan which dissipates about 1.2 watts in to the box.
I used Arduino to control remote power sockets as described here.
I haven't made the box yet but lets assume that the volume of proofing box is about 5 cubic meter (176 cubic foot). This is enough to hold a large rack of prepped baked goods.
A dough proofer is a warming chamber used in baking that encourages fermentation of dough by yeast through warm temperatures and controlled humidity. It is also called a proofing box, proofing oven or proofing cabinet.
It is used in bulk fermentation and final fermentation stages of bread making. For example after shaping, for the final fermentation the dough pieces are placed in a temperature and humidity controlled cabinet called a proof box. In this context the word proof means fermentation.Typically the dough will almost double it's volume about an hour and a half at 24 ° C (75 ° F) an a humidity of 75 %. If we want to decrease final fermentation time we might increase the internal temperature about 28 ° C (82 ° F) Thus, the final fermentation time is reduced to 1 hour.
For sourdough this temperature might be 20 ° C (68 ° F) or lower.
As far as I know, these temperatures are usually used. But for box I took a wider temperature range because maybe in future I might use it to ferment yogurt.
Operating temperature, that is inside the box might be between 20 ° C and 40 ° C (68 ° F and 104 ° F) The box will stay inside.
Temperature ranges outside the box might varry between 15 ° C and 40 ° C (59 °F and 104 ° F)
Temperature accuracy of the box should be ±0.5°C. It should respond to outside temperature changes quite fast. Let's say if I open the door of the box in one minute or less, it should be able to reach the old temperature again.
At first glance I planned to use a peltier module. But someone with experience in electronics said that the peltier module couldn't have enough cooling.
Controlling humidity is as important as controlling temperature and large air currents are undesirable.
What might be the options for cooling a 5 cubic meter (176 cubic foot) proofing box.