the air gets compressed while increasing in temperature, creating a superheated vapor. The vapor then goes through a condenser and converts into a liquid form, dispelling more heat in the process. Traveling through the expansion valve, the liquid refrigerant forms a mixture of liquid and vapor. As it passes through the evaporator, vapor refrigerant forms and expels into the air, repeating the refrigerant cycle. Absorption heat pumps The process for the absorption heat pump works similarly to the compression variant with the main contrast being the usage of an absorber instead of a compressor. The absorber takes in the vapor refrigerant and creates a liquid form which then travels into the liquid pump to be turned into superheated vapor. The absorption heat pump utilizes both electric and heat for its functionality compared to compression heat pumps which only uses electricity. Evaporative coolers An evaporative cooler absorbs the outside air and passes it through water-saturated pads, lowering the temperature of the air through water evaporation. It can be divided by: Direct This method evaporates the water which would then travel directly into the air stream, producing a small form of humidity. It usually requires a decent amount of water consumption in order to properly lower the temperature of the surrounding area. Indirect This method evaporates the water into a second air stream and then putting it through a heat exchanger, lowering the temperature of the main air stream without adding any humidity. Compared to direct evaporative coolers, it requires much less water consumption to operate and lowering temperature. Other applications Besides normal commercial usage of active cooling, researchers are also looking for ways to improve the implementation of active cooling into various technologies. Thermoelectric Generator(TEG) The thermoelectric generator, or TEG, is a power source that has been recently experimented with to test its viability in maintaining active cooling. It is a device that makes use of the Seebeck effect to convert heat energy into electrical energy. Applications of the power source are more commonly found in technologies requiring high power. Examples include space probes, aircraft, and automobiles. In a 2019 research, the viability of TEG active cooling was tested. The test was applied on a Raspberry PI3, a small single-board computer, equipped with a fan powered by TEG and was compared alongside another powered by a commercial passive cooler. Throughout the research, the voltage, the power, and the temperature in both