This trainer has been designed specifically for educational aims: besides emphasizing the typical hydraulic, mechanical and thermodynamic aspects of all heat pumps, via a wide set of sensors, it can also acquire in real time all the data of refrigerant and air cycles and assess heat balances and efficiency, via a Personal Computer (supplied on demand). Furthermore students can examine the use of an intermediate fluid for the transport of thermal or refrigerating power from the production site to the place of use.
TRAINING PROGRAM
• Plant starting and safety devices intervention checking
• Studying the operation of a heat pump
• Studying the operation of a cycle-reversing valve
• Studying the operation of an electronic expansion valve
• Proportional control
• Examining the system behaviour versus the variation of:
– season
– air flow at condenser/evaporator
– air flow at air/water exchanger
• Plotting the refrigeration cycle on refrigerant pressure enthalpy diagram
• Data acquisition and calculation of:
– exchange surfaces
– heat balances corresponding to evaporator, condenser, compressor
– refrigerant mass flow
– ideal and actual E.E.R.
– ideal and actual C.O.P.
– volumetric compressor efficiency
– heat balance on water side
• The software of the equipment enables to enter different sections:
– system automatic or manual operation
– refrigerating circuit heat balance
– water/air circuit heat balance
– enabling the insertion of (11) faults
– troubleshooting and plant operation reset
– system supervision with display of the values acquired by sensors
TECHNICAL SPECIFICATIONS
• Steel structure mounted on wheels, painted and treated in the oven
• Color silk-screen-printed schematic diagram of the two alternative cycles, with warning LEDs
• Hermetic compressor
• Variable flow forced-air condenser/evaporator
• Evaporator/condenser coil
• Liquid receiver, liquid separator
• On-off valves, sight glass, dehydrator filter, check valves
• Electronic expansion valve
• Electrically driven cycle-reversing valve
• Valve for plant vacuum, refrigerant charging and recovering
• Pipes connecting the various components painted with different colors
• Heat storage tank for refrigerant/water heat exchange
• Water pump
• Variable flow forced-air air/water exchanger
• Transducers and sensors for acquiring the following system operating parameters: voltage, current, power factor, temperatures, relative humidity, cycle pressures, refrigerant and water flow rate
• High and low pressure gauges
• Double pressure switch
• Thermomagnetic – earth leakage control button
• Emergency button
• PC control program
• Power supply: 230 Vac 50 Hz single-phase – 1000 VA (Other voltage and frequency on request)
