Water Cooled Reciprocating Air Conditioning

Water Cooled Reciprocating Air Conditioning Points : water cooled reciprocating air conditioning, compressor, condenser, filter drier, evaporator, thermostatic expansion valve, refrigeration cycle 1. Compressor The compressor is used to compress refrigerant vapor from the evaporator coil, to high pressure vapor & discharge it into the condenser. Refrigerant enters the compressor through a suction service valve passes out through a discharge service valve. 2. Condenser The condenser coil is used to cool & condense refrigerant vapor to a liquid. The condenser is water-cooled & is made of copper tubing enclose within steel tubing. The inner tube carries the water & the outer the refrigerant. 3. Filter Drier The filter drier is a small cylindrical throw-away type vessel containing a drying chemical & a filter. It absorbs moisture & traps foreign material from the refrigerant as it leaves the condenser on its way to the expansion valve. 4. Evaporator The evaporator coil consists of an aluminum housing that contains circuits of parallel staggered copper tuber expanded into aluminum extended surfaces. The vaporizing refrigerant flows through the evaporator coil & absorbs heat from the air as it passes over the aluminum fins. The air is circulated by means of a fan located above the evaporator. 5. Thermostatic Expansion Valve The thermostatic expansion valve acts as a metering device for the flow of liquid refrigerant into the evaporator coil; the expansion valve is controlled by a thermal (feeler) bulb clamped, to the suction line which senses pressures in the suction line at the thermal bulb location given an accurately controlled superheat. 6. Refrigeration Cycle The liquid refrigerant entering the evaporator at entrance of the liquid to the evaporator is controlled by an automatic throttling device called the expansion valve, which is controlled by temperature & pressure in the suction line. This valve is designed to meter there refrigerant flow in such a way that refrigerant vapor leaving the coil is superheated 10°F.

The reducing of pressure by valve allows the refrigerant to boil or vaporize at a low temperature. The liquid — vapor refrigerant mixture absorbs heat from the air being circulated, over the evaporator coil. As the refrigerant absorbs heat it change into a vapor. Throughout its journey in the evaporator coil, the refrigerant continues to absorb heat until it is completely evaporated.

Due to the sucking action the compressor, the gas is drawn through the suction line into the compressor cylinder. The down stroke of the piston admits a cylinder full of gas through the suction valve & then compresses this gas on the upstroke; therefore, raising its temperature & pressure. The compressed gas is kept from re-entering the cylinder on its next dawn stroke by the compressor discharge valve. The pressure thus produced causes the hot gas to flow to the condenser. After the compressed gas passes the discharge valve & has entered the condenser heat flows from the hot gas into the condensing medium (water), thus cooling the compressed gas & a changed of stage from a gas to liquid occurs. This liquids then forced through the liquid line to the expansion valve for repetition of the cycle.