Psychrometer

Desert Cooler Trainer works on the principle of evaporative cooling. It is used mostly in the dry hot regions; it consists of a fan which sucks the air from atmosphere through the pads which are used in desert coolers very frequently. The difference in DBT & WBT at inlet and outlet can be measured hence the RH from the charts. Also the amount of water evaporated can be calculated by knowing the water level difference in the reservoir.

SPECIFICATIONS:

1.Fan connected to 1/2 HP motor. 2.Air Cooler Pump to circulate water. 3.DBT & WBT Measuring Thermometer at inlet and outlet. 4.Orifice meter with manometer to measure the air flow. A technical manual accompanies the unit.

SERVICES REQUIRED:

1.Floor Area – 1, X 1 m. X 1 -5m. Height. 2.220 V., 15 Amp. , Single Phase Stabilized power supply

The unit consists of ducting fitted with various air conditioning components. Airflow is generated by an axial flow fan and in the airflow, heaters, cooling coil and steam humidifier connection is provided. Cooling circuit consists of a hermetic compressor; air cooled condenser, thermostatic expansion valve and evaporator (i.e. cooling coil). Measurements of various parameters Torn cooling cycle and heating cycle are provided and students can easily visualize and understand the basic principles of air conditioning.

SPECIFICATIONS:

1.Cooling circuits – It consists of: a) Hermetic compressor, having the capacity of 2/3 ton of refrigeration (approx.) using R-22 refrigerant. b) Rotameter for liquid refrigerant flow measurement. c) Pressure gauges for high and low pressure. d) Prescott (i.e. high and low pressure cut-out). e) Thermometers for temperature measurement at various points In the cycle. f) Energymeter for compressor input measurement. g) Condensate measuring arrangement. 2.Heating Circuit – Air heaters with input control provided with energymeter for input measurement. Maximum heating capacity 1 Kw. 3.Steam generator and injector for humidification of air. All above components are connected to a duct of size 200mm. X 200mm. in which airflow is generated by axial flow fan. 4.Anemometer for measurement of air velocity, (range 0-15 m/sec. Following experiments can be conducted on the unit a) Cooling of atmospheric air. b) Heating of atmospheric air. c) Humidification of atmospheric air. d) Dehumidification and heating of atmospheric air. (Cooling coil acts as dehumidifier at reduced airflow.)

SERVICES REQUIRED:

1.440 V, 15 A, 3 Phase supply with earthing connection. 2.Floor space area about 3 m. X 2 m.

The apparatus consists of a storage water tank, embraced by evaporator coil of the cooling unit, cooling cycle comprises of a hermetically sealed compressor, air-cooled condenser, a capillary tube as expansion device and an evaporator cell. The stainless steel water tank is provided with insulation on air Sides and a door are provided at the top. Cold water can be taken out from a top provided and inlet water supply is controlled by a bail-operated top. Various measurements provided enable students to determine the theoretical and actual COP, power consumption, actual cooling capacity refrigerant flow and compressor volumetric efficiency of compressor.

SPECIFICATIONS:

Cooling Cycle a) Compressor Hermetically sealed type, having the capacity of 1/3 ton of refrigeration using R-12 refrigerant. b) Finned tube type air colled condenser with forced air flow. c) Filter cum drier for refrigerant. d) Capacity expansion device. e) Evaporator coil embraced on stainless steel water tank, Provided with glass wool Insulation. 2.Water drain tap and float operated inlet water tap are provided for water tank with insulated lift door at top. 3.Measurement a) Pressure gauges for evaporating and condensing pressure. b) Thermometers to measure refrigerant temperatures at inlet and out let of condenser and evaporator. c) Dial type thermometer for water temperature. d) Rotameter to measure liquid refrigerant flow. e) Energymeter to measure compressor Input. 4.Safely & Controls – a) Thermostat to put off compressor at set water temperature. b) Pressostat to put off compressor if high or low pressure Goes out of set limit. c) Over load protector for compressor, A technical manual will be supplied along – with the unit. Also, the unit is provided with an attractive and anti corrosion powder costing.

SERVICES REQUIRED:

1.Floor space of 1.5 m. X 1.5 m. 2.Water supply of 5 lit/min, 3.230 V, 15A AC stabilized supply with earthing connection

In old times refrigerant gas leakage was detected with the help of soap foam but with the help of refrigerant gas leak detector we can do the same job in more professional and reliable way.