This educational simulator is designed for the training in the sector of computer-aided control of industrial systems and it simulates the operation of an industrial refrigeration system with two cold rooms: one for frozen products (L.T.: low temperature) and the other for fresh vegetable products (M.T.: medium temperature). It enables to check the system behavior and the importance of the involved parameters, once fixed the set-point values of reference variables. This simulator must necessarily be connected with a PC (supplied on demand).
TRAINING PROGRAM
• Studying the pressure-enthalpy diagram of a refrigerant
• Studying on the psychrometric chart the air transformations at the evaporator of a cold room
• Heat balances on refrigerant side and on air side
• Studying the heat losses of a cold room
• Analyzing the behavior of a refrigeration system with a unique compressor/condenser set and double level of evaporation pressure
• How the difference between room temperature and evaporation temperature affects the relative humidity of a cold room for fresh food
• Analyzing the operation of an electronic expansion valve
• Analyzing the operation of an evaporation pressure regulator
• Proportional and ON/OFF control
• Programming and testing ON/OFF or PI control logics
TECHNICAL SPECIFICATIONS
• Color panel representing the refrigeration system
• Board for data acquisition and control of output signals to the actuators
• Connection with PC via USB cable
• 3 potentiometers for simulating the following analog inputs:
– L.T. room air temperature set-point
– M.T. room air temperature set-point
– M.T. room air relative humidity set-point
• 7 bar-graph LEDs for simulating the following analog outputs:
– L.T. room air temperature
– L.T. room product temperature
– M.T. room air temperature
– M.T. room product temperature
– M.T. room air relative humidity
– control signal of the electronic expansion valve motor (L.T. room)
– control signal of the evaporation pressure regulator motor (M.T. room)
• 4 switches for simulating the following digital inputs:
– system operation enabling
– cold rooms thermal insulation
– L.T. room solenoid valve enabling
– M.T. room solenoid valve enabling
• 6 LEDs for simulating the following digital outputs:
– system enabling
– compressor enabling
– L.T. room solenoid valve enabling
– M.T. room solenoid valve enabling
– freezing cycle operation
– refrigeration cycle operation
• Program for simulating the operation of the refrigeration unit control system
• Creation software that can be used to modify the applications programs according to customer’s needs.
• Power supply: 230 Vac 50 Hz single-phase – 200 VA (Other voltage and frequency on request)
