Desert Cooler Trainer

This type of refrigeration is usually used for domestic purposes only as it is complex in the construction and working. This type of refrigerator was developed in 1925 by Munters and Battzervan when they were studying at Royal Institute of Technology At Stockholm for their undergraduate course. This type of refrigerator was known as three fluid refrigeration system. The elimination of aqua pump from the absorption system with the complete absence of moving parts and work input. The main purpose of removing the pump was to make the machine noiseless. It uses refrigerant as a solvent s and an inlet gas for inlet of the system. The inert gas is continued to the lower side of system only by its system. It is possible to maintain the uniform pressure throughout the system and after sometime permitting the refrigerant to evaporator at low temperature corresponding to its partial pressure. In the high pressure side system (generator and condenser), there exists only the refrigerant which is subjected to total pressure of the system so that it is condensed by using normal cooling water as air as it is done in other system. The strong aqua ammonia solution is heated in generator by the application of external heat source. The water vapor carried with ammonia vapor is removed in separate form as shown in figure. Then the dry ammonia vapor is passed into the condenser and it is condensed by using external cooling source. The liquid ammonia flows under gravity in the evaporator and it evaporates. The mixture of hydrogen and ammonia vapor is passed into the absorber and the weak solution from aqua ammonia from the separator is allowed to follow into the absorber, through tray this weak aqua ammonia solution comes into contact with hydrogen separated. This strong solution is further passed to the generator and it completes the cycle.

The Plant uses ice can system. The cans filled with fresh wafer are kept in a tank in which brine is circulated. The brine is cooled by the refrigerant, which in turn cools the water in can and ice formation takes place.

SPECIFICATIONS:

1.Compressor : Kirioskar make hermetically sealed compressor using R 12 Refrigerant. 2.Condenser : 4 row type air cooled. 3.Expansion Valve : 0.5 TR capacity. 4.Evaporator : 1/2″ O.D. copper tube – 75 feet long. 5.Filter – Drier : Silica gel filled – 3/8″ flare connections. 6.Main Tank : 600 mm X 375 mm 7.Total Ice Cane Capacity : 7 Kg 8.Ice Making Capacity : 7 Kg / 4 Hours. 9.Thermocol insulation : 6.5″ 10.Brine Stirrer : Motor driven fan, 1 phase, 1/10 HP, 1440.

INSTRUMENTATION:

1.Temperature Indicator : Digital Type O300°c, with 1 °c least count, using Cr/Al thermocouples. Accuracy 1 % of full reading. 2.Compressor Energy Meter : Single Phase, 10 – 20 Amp. Capacity. 3.Pressure Gauge: a)0-21 Kg/cm2 b) -1 to 10.6 Kg/cm2 c) Both of 65 mm dial. 4.Digital Thermometer CONTROLS : 1.HP/LP Cutout : Auto reset type. 2.Thermostat : Auto reset type. A technical manual accompanies the unit.

SERVICES REQUIRED:

1.Floor Area – 2m. X 1.5m. X 1.5m. Height. 2.220 V., 15 Amp.Single Phase Stabilized power supply

This apparatus is used to calculate the wind or air velocity. We can place the anemometer in front of air vent of a window air conditioner and record the air velocity.

Heat Pump is a device to pump heat from one source to another. The heat obtained by heat pump is more than that could be obtained by direct electrical heating. The apparatus consists of refrigeration system with water cooled shell and coil type evaporator and condenser.

SPECIFICATIONS:

1.Compressor – Hermetically sealed compressor using R-12 refrigerant, having capacity 0.3 tons of refrigeration. Condensing pressure – max. 15 Kg/cm2 (Actual pressures will depend upon working conditions). 2.Condenser – Shell and coil type with continuous water flow arrangement. 3.Evaporator – Shell and coil type with continuous water flow arrangement. 4.Expansion Valve – Internally equalized thermostatic expansion valve. 5.Measurements – a) Rotameter for condenser & evaporator water flow rate measurement. b) Rotameter for liquid refrigerant flow measurement. c) Pressure gauges for condensing and evaporating pressure – 2 Nos. d) Thermometer for refrigeration cycle & water temp, measurement – 7 e) Wattmeter for compressor input measurement. f) Ammeter for compressor current measurement. 6.Controls – a) HP/LP cutout for compressor. b) Overload protector for compressor. c) Gate valve to control water flow rates. d) Necessary switches and fuse. A technical manual is accompanies the unit.

SERVICES REQUIRED:

1.Floor surface area – 2m, X 2m. X 1.5m. height. 2.220V. 15Amp. Single Phase Stabilized power supply.