Wet Dry Thermometer

The unit enables students to study the various parameters affecting the performance of a domestic refrigerator. It consists of refrigeration cycle of domestic refrigerator, it consists a hermetically sealed compressor, air-cooled condenser, capillary tube and a natural convection type evaporator. The evaporator is fitted with a small heater to simulate different load conditions various measurements are provided so that power consumption, COP, theoretical and actual refrigerating effects refrigerant flow rate and effect of door opening on power consumption can be studied and also students can visualize automatic operation of unit using a thermostat.

SPECIFICATIONS:

1.Compressor – Hermetically sealed, Kirioskar make having capacity of approx. 1/25 ton of refrigeration. 2.Air – cooled condenser with natural convection airflow. 3.Capillary tube of matched length as expansion device. 4.Evaporator coil with an electric heater inside and adequate glass wool insulation on all side. 5.Measurement a)Energymeter Tore compressor input power measurement. b)Pressure gauge for condensing and evaporating pressure. c)Flow meter for liquid refrigerant flow d)Digital Temperature indicator for measurement of temperature 6.safety & Controls a)High & low pressure cutout. b)Thermostat. c)Necessary Switches. A technical manual accompanies the unit. Also, the unit is provided with an attractive and rust proof powder coating.

SERVICES REQUIRED:

1.Floor space of 2m x 1m. 2.230V AC stabilized supply with earthing connection

This apparatus is used to calculate the wind or air velocity it has a special probe that can easily enter into air ducts. We can place the anemometer inside the air ducts of air conditioner and record the air velocity.

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.