The liquid refrigerant received from capillary tube flows through the evaporator coil, whereas, water to be cooled is made to pass in the water coil through a filter and a flow regulator. 2, the cooling coil and water coil are shown separately for the illustration purpose. One coil is cooled as cooling coil and other one is water coil. In case of instantaneous type of water cooler, evaporator consists of “two separate cylindrically wounded coils made-up of copper or stainless Steel”. This happens, when the cold water tap is opened more frequently and for long time. The major drawback of instantaneous water cooler is slow delivery rate. Therefore, as soon as water to be cooled enters the tap water line, it gets cooled instantaneously. The cooling coil is directly wounded on the tap water line. Instantaneous type of water cooler gives cold water as and when required. Instantaneous Type Water Coolerįigure 2: Instantaneous Type Water Cooler. As soon as, the desired temperature is attained by water in the storage tank, the compressor is cut-off by thermostat.Īpplications: Used in offices, schools, hospitals, factories etc. From condenser outlet, the liquid refrigerant passes through a capillary tube to the evaporator coil and the cycle is repeated number of times, till the desired cooling of water occurs. This increases rate of cooling and refrigerant and condensation of vapour refrigerant into liquid refrigerant occurs in short time. A condenser fan placed in front of the condenser coils to produce artificial draught of air. In an air-cooled condenser, the heat content of refrigerant is rejected to atmosphere. This vapour refrigerant is sucked by the compressor, where it is compressed to high pressure, high temperature and is sent to condenser. When the vapour compression system starts to operate, the heat of water is taken up by the refrigerant flow through the evaporator coil and gets evaporated. A push type water tap is generally provided for drawing cold water. Water level is maintained with the help of float valve to minimize the wastage of refrigerated water. Separate inlet and outlet connections of water are provided to storage tank. Thermostat is provided to control the temperature of water. It consists of a hermetically sealed compressor, condenser, capillary tube, accumulator, refrigerant coil, water cooling coil, thermostat, relay, overload protection etc. The water level in the water tank is maintained and controlled by a float valve. The tank is made of stainless steel or GI sheet. The storage type water cooler has an evaporator coil soldered on the outside surface of the wall.

Cabinet to hide water cooler