Basic Refrigeration Cycle

In order to economically operate the air conditioning system, the refrigerant must be reused. Therefore, all air conditioners use the same compression, condensation, expansion and evaporation cycles within a closed loop. Use the same refrigerant to transfer heat from one area to cool that area and discharge that heat to another area

The refrigerant flows into the compressor as a low pressure gas, is compressed, and then discharged as a high pressure gas from the compressor.

After that, gas flows into the condenser. Here, the gas condenses into liquid and releases heat to the outside air.

After that, the liquid moves to the expansion valve under high pressure. The valve limits fluid flow and reduces pressure as it exits the expansion valve

After that, the low pressure liquid moves to the evaporator, the heat from the inside air is absorbed and it turns from liquid to gas.

As a hot low-pressure gas, the refrigerant moves to the compressor, where the entire cycle repeats.

Please note that the 4 division cycle is divided into high side and low side at the center. This represents the pressure of the refrigerant on both sides of the system.

FIG. 1 shows a schematic diagram of a basic water-ammonia refrigeration cycle. High Pressure Refrigerant (Ammonia) Vapor enters the condenser where heat is conducted nearby. The liquid ammonia exits the condenser, passes through the throttle valve (expands), and reaches the pressure of the evaporator. After that, the refrigerant enters the evaporator, where it takes heat from the space to be cooled and becomes low pressure steam. In this sequence, refrigerant (ammonia) vapor enters the absorber where water and a weak solution of low concentration of ammonia absorbs the refrigerant and transmits heat nearby. This solution now has a high ammonia concentration and is pumped to the steam generator. The generator receives heat from an external heat source. The ammonia in the solution then evaporates, separates from the water and flows into the condenser to start a new cycle.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to freezing produced by an intermittent absorption cycle. This cycle is driven by solar radiation, ammonia is used as refrigerant and liquid, preferably water, is used as absorbent. Solar radiation is collected by a composite parabolic concentrator (2) that reflects light onto a cylindrical target container (1) containing a coolant and an absorbent. The ammonia boils from the target vessel (1) and the ammonia vapor enters the condenser (5) where it is cooled to liquid and the liquid is stored in the receiving vessel (6).

In a typical refrigeration cycle, a refrigerant gas such as ammonia, Freon, etc. is compressed in the compressor, passes through a condenser and is heated to a liquid, and then passes through an expansion valve to the evaporator coil to absorb heat . The refrigerant is returned to the gaseous state for recompression in the compressor, and the refrigeration cycle is completed. The evaporator coil is placed in the freezer, display case or cabinet and the heat absorbed by the coolant of the coil is used to extract the heat from the refrigerator and its contents to maintain the box at the desired temperature . Extraction of heat from the refrigerator and its contents has to be periodically removed to create frost on the evaporator coil, maintain proper operation of the evaporator coil and avoid undesirable frost buildup It is well known. Other parts of the coil or cooler