Different from a compressor, a 3 way car refrigerator with compressor does not cool the system, but instead, extracts the heat. Otherwise known as absorption technology, there is a transfer of gas and energy in the back of the unit.
Absorption Cooling Cycle
The cooling cycle works in a three-step process using ammonia as the refrigerant. Water and hydrogen gas cycle this ammonia continuously to keep the system operating.
In the first stage, otherwise known as evaporation, there is a low partial pressure, which causes liquid refrigerant, or ammonia, to evaporate. When this happens, the removal of heat from the fridge occurs.
During the absorption phase, the gaseous refrigerant becomes another liquid after it is absorbed. This process reduces its partial pressure so that more fluid can evaporate.
In the final step, called regeneration, heating of the liquid ammonia occurs, which causes the refrigerant to evaporate. The vapor is condensed in a heat exchanger to replenish fluid in the evaporator.
Vapor Absorption Refrigerator
Five Components to a 3 Way Fridge
The refrigerator consists of five different parts that each play a vital role in the proper functioning of the 3 way RV refrigerator.
The cycle begins in the evaporator, where room temperature, liquified ammonia enters the chamber and becomes mixed with hydrogen. The partial pressure of the hydrogen manipulates the total force, which changes the vapor pressure. The boiling point of ammonia is then lowered, causing it to evaporate, thus removing heat from the evaporator.
It is in the absorber that the water absorbs ammonia gas. This process begins when gasses flow into upward, twisting pipes until they reach water at the top. When the ammonia combines with the water, it creates an ammonia-water mixture and hydrogen solution. The two are separated in the absorber, as the hydrogen moves to the top and the ammonia gathers at the bottom.
The generator heats the ammonia and water mix to extract the ammonia. The removal of remaining water vapor and bubbles occurs in the next step.
The separator consists of winding, uphill tubes to pop the bubbles and rid excess water molecules, which isolates the ammonia. Now the vapor is completely separated from the water.
Lastly, the condenser, also known as the heat exchanger, takes this hot ammonia gas and changes it into liquid ammonia through a cooling and condensing process. The cycle then begins all over again.
Benefits of 3 Way RV Fridges
If you’re looking for an all-purpose and convenient product, a 3 way RV refrigerator is the best option. These fridges can run off gas power (LPG), 12V energy from a battery (DC) or solar system, and 110V electricity (AC).
With these options, you’ll never have to go without a cooling unit again. Whether you’re driving, hooked up to a site, or boondocking, your refrigerator will undoubtedly keep your food cold.
These 3 way fridges are beneficial for many more reasons.
Eliminates Stress About Refilling Propane – Propane is the most efficient and effective powering method, especially if you’re trying to avoid stopping at hookups. For example, one 9kg bottle of gas will run the fridge for about 2-3 weeks. This longer span allows you to adventure as far as you want without worrying about food.
Uses Shore or Generator Power When Accessible – If you enjoy traveling from site to site or prefer to remain stationary, the fridge will run off 110V. This feature allows you to cut down on propane and battery by occasionally using a hookup.
Operates Using Battery Power When Driving – Unfortunately, you cannot use gas or mains power while driving; however, you can use a 12V battery from the RV or vehicle. Always make sure to change the power source when you’re stopped for long periods to avoid draining the battery.
Silent Operating System – Standard fridges use compressors, which can be noisy and disruptive. A 3 way RV refrigerator, on the other hand, uses absorption technology. This system uses mainly fluids and gas, meaning it is quieter than most.
Less Maintenance – These systems are dependable and do not typically need routine care.
Lasts Longer Than Other Types of RV Refrigerators – Compressors and 2 way fridges are more likely to need repairs and replacements sooner than a 3 way RV camping car freezer. These types are more durable as they have fewer parts and mechanisms.