Refrigerator Training System

MODEL：BORACS-02

1. Scope of Supply:

Provide, deliver, install, test, commission, and hand over a complete refrigerator training system, including: a training bench with a complete refrigeration circuit, an integrated data acquisition system, authorized data acquisition software, an RFID power management system, a branded desktop computer, an offline UPS, all instruments, accessories, and documentation. The system is complete, operational, and ready for immediate use in teaching.

2. Overview:

The refrigerator training system is a desktop-type teaching unit designed specifically for laboratory research in refrigeration thermodynamics and system performance analysis.

This system enables students to: observe and analyze the various stages of the refrigeration cycle; plot and interpret pressure-enthalpy (P-h) diagrams; determine superheat and subcooling; calculate the coefficient of performance (COP); compare actual cycle performance with the reverse Carnot cycle; and evaluate compressor efficiency.

The refrigerant is R134a or an equivalent environmentally friendly refrigerant.

3. Mechanical Structure:

Training Bench: Movable aluminum profile structure.

Dimensions: 1200 (L) × 700 (W) × 1600 (H) mm

Mounted on four casters: two with brakes, two without brakes.

Front Demonstration Board: Silkscreened refrigeration circuit diagram, clearly labeled components, color-coded refrigerant piping (red/blue).

4. Electrical Requirements:

Power Supply: 220V ±10%, single phase, 50Hz

Rated Current: 10A

Residual Current Circuit Breaker (16A) Key Switch (self-locking)

Emergency Stop Button (self-locking) Overload Protector (5A)

Indicator Lights (at least 5) Power Monitoring Module

5. Refrigeration System Components:

This system includes, but is not limited to, the following components:

Compressor: Power: 1/8 HP; Displacement: approx. 4 cm³ ; Cooling capacity: approx. 329 watts (compliant with EN 12900)

Condenser (with water tank): Spiral copper tubing (12-14 turns); outer diameter 1/4 inch tubing; submerged in the water tank; heat exchange area approx. 0.082 square meters.

Evaporator (with water tank): Spiral copper tubing (7-9 turns); outer diameter 1/4 inch tubing; submerged in the water tank; heat exchange area approx. 0.049 square meters.

Circulation Pump: Voltage: 220V ±10%; Power: 165 watts; Adjustable (three power settings); Flow rate: approx. 80 liters/minute; Quantity: 2 pieces

Expansion Valve: Built-in balanced thermostatic expansion valve (TEV).

Filter/Dryer: 1/4 inch connection

Service and Manual Valve: Flared threaded connection. 1/4 inch pipe diameter. Sight glasses:

Installed at the liquid line, suction line, and evaporator inlet (3 pcs).

6. Instruments and Sensors:

System includes:

Low pressure gauge: -30 ~ 260 psi

High pressure gauge: -30 ~ 550 psi

Pressure transmitter: 0–2 MPa (4–20 mA output) – 2

Temperature transmitter (PT100) – 4

Digital thermometer (-40°C to +90°C) – 4

Pointer voltmeter (0–250V)

Pointer ammeter (0–5A)

LCD display for real-time measurement

Analog input module

Power monitoring module

High/low pressure controller.

Pressure and temperature should be measurable at multiple points in the refrigeration circuit.

7. Water Tanks and Heat Exchange System:

• Evaporator and condenser coils submerged in separate water tanks.

• Water tank temperature sensors provided.

• The circulation system allow circulation between water tanks during steady-state testing.

• The system allow demonstration of cooling and heat pump circulation.

8. Integrated Data Acquisition System:

The system includes a built-in multi-functional data acquisition system with the following specifications: USB connection to a computer; Real-time data acquisition; High-precision measurement capabilities; Manual and automatic data logging; Configurable sampling intervals (time-based or interval-based); Digital and analog instrument display modes; User-friendly graphical interface; Customizable layout and display.

All necessary USB cables will be provided.

9. RFID Power Management System (Mandatory):

The equipment shall include an integrated RFID-based power control system with the following functions: Operating frequency: 13.56 MHz (high frequency); Communication via RS485 (standard); LED display for showing RFID card information; Audible status prompts; LED indicators; Data verification function; Parameter configuration via software; Compliance with ISO-15693 protocol; Support for ModBus_TCP and ModBus_RTU.

The RFID system will control power activation via card authentication.

11. Learning Functions:

The system supports the following experimental exercises:

using pressure-enthalpy diagrams; determining superheat and subcooling; refrigeration energy balance; calculating the coefficient of performance (COP); determining isentropic efficiency and volumetric efficiency; the effect of heat source and cold source temperatures on COP; and comparison between actual and reverse Carnot cycles.

Manuals: The machine comes with an English user manual, training/experiment manual, circuit schematic diagram, refrigeration circuit diagram, maintenance manual, spare parts list, RFID system documents and software (electronic version).