The behavior you described is related to the different types of refrigerators and their cooling systems. There are two primary types of refrigerators commonly used:
Compressor-based refrigerators: These are the traditional refrigerators found in most homes and some RVs. They use a compressor to circulate a refrigerant (usually a gas) through a closed loop system. The refrigerant absorbs heat from the inside of the fridge and releases it outside, thus cooling the interior. The compressor runs intermittently to maintain the desired temperature, turning on when the temperature rises above the set level and turning off when it reaches the desired temperature.
Absorption refrigerators: These types of refrigerators are commonly used in RVs and other mobile applications. Instead of a compressor, they use a different cooling mechanism based on absorption and heat exchange. Absorption fridges typically use heat, either from a propane flame or an electric heating element, to produce the cooling effect. They do not have a traditional compressor that turns on and off; instead, they run continuously using a heat source to maintain cooling.
The main reason why compressor-based fridges turn on and off is to save energy and maintain a stable temperature inside the refrigerator. When the fridge is at the desired temperature, the compressor stops running until the temperature starts to rise again. This cycling on and off helps conserve electricity and prevents the refrigerator from overcooling.
On the other hand, absorption fridges do not have a compressor, and their cooling process depends on a continuous heat source. As a result, they do not have the same on-off cycling behavior as compressor-based fridges. They will run continuously as long as the heat source (propane or electricity) is supplied to the system.
Both types of refrigerators have their advantages and disadvantages. Compressor-based fridges are generally more energy-efficient and can cool food faster, but they might not be ideal for all RV setups due to their power requirements. Absorption fridges, while less energy-efficient, can run on propane, making them suitable for off-grid camping.
The choice between the two types depends on various factors, including your camping habits, power availability, and energy preferences.