KTE-5000LT

Equipment Introduction

• Binary refrigeration system experiment using two different types of refrigerants

• Operation characteristic experiments based on a two-stage cascade refrigeration system using R-404A and R-23

• Drawing of the Pressure–Enthalpy (P–h) diagram using data exported to Microsoft Excel through refrigeration utility software

• Operating tests to analyze variations in evaporating pressure by controlling the evaporator

• DAQ program providing tools to measure temperature, pressure, enthalpy, and exchanged heat at each measurement point in real time, with data saved directly as Microsoft Excel files for graphical analysis

Equipment Characteristics

• High-Temperature Cycle

  Compressor 1 → Condenser → Filter Dryer → Sight Glass → Solenoid Valve 1 → Manual Expansion Valve 1 → Cascade Evaporator → Compressor 1

• Low-Temperature Cycle

  Compressor 2 → Cascade Condenser → Filter Dryer → Sight Glass → Solenoid Valve 2 → Manual Expansion Valve 2 → Evaporator → Compressor 2

• The system can be operated in manual mode, temperature control mode, or pump-down mode, using either sequence control or a PLC control system

• Automatic measurement, data acquisition, and system monitoring functions for refrigeration performance evaluation

• Temperature measurement at compressor inlet and outlet, condenser inlet and outlet, expansion valve inlet and outlet, evaporator outlet, inside chamber, and ambient air using K-type thermocouples

• Pressure measurement within the range of –1 to 35 bar at the compressor inlet and outlet, condenser outlet, and expansion valve inlet using installed pressure sensors

• Experimental Parameters

  • Refrigeration effect

  • Compressor work

  • Condensing effect

  • Evaporating latent heat

  • Amount of flash gas at the expansion valve outlet

  • Dryness ratio and humidity at the expansion valve outlet

  • Coefficient of Performance (COP)

  • Measured temperature and pressure data

  • All measured data can be saved at one-minute intervals for up to 1,440 minutes as Microsoft Excel files by clicking the “SAVE” button

Education Contents

1. Measurement and analysis of a binary refrigeration system using software

2. Performance measurement and analysis of a binary refrigeration system

3. Configuration and operation of manual sequence control circuits for a binary refrigeration system

4. Manual control PLC programming and operation for a binary refrigeration system

5. Configuration of automatic temperature control sequence circuits for Stage 1 of the binary refrigeration system

6. Configuration of automatic temperature control sequence circuits for Stage 2 of the binary refrigeration system

Mechanical Refrigeration Device Component

Control Panel Device Component

Dual Pressure Switch

Structure of DA100 Program

Composition of main user interface

1. Schematic diagram of the system displaying temperature and pressure in real time.

2. P–h (Pressure–Enthalpy) chart.

3. Data table showing temperature, humidity, and enthalpy values.

4. Calculated performance values, including Coefficient of Performance (COP), cooling capacity, and heating capacity of the heat exchanger.

5. Toggle switch to start the program and save measured data.

Binary Refrigeration Trainer

• Main Menu Used for software and hardware configuration, system settings, and initialization of registered parameters.

• System Flow Chart Selection and display of the flow chart for each refrigeration system.

• Real-Time Data Display Real-time display of measured temperature and pressure data in text format.

• P–h Diagram Selection and visualization of the pressure–enthalpy (P–h) diagram for each refrigeration system.

• Automatic Performance Calculation and display of performance data, including:

  • Refrigeration effect (Qe)

  • Compressor work (W)

  • Condensing load (Qc)

  • Flash gas (Qf)

  • Reheating load (Qr)

  • Dryness fraction (x, y)

  • Coefficient of Performance (COP)

• Program Control Functions to start, stop, save data, terminate the program, and monitor the operating status of the system.

• Data & Diagram Storage Saving of system flow charts and P–h diagrams for documentation and further analysis.

P-h diagram

The system supports individual P–h diagram generation for each refrigerant, enabling comparative performance analysis.

Operating Conditions

1. Evaporating temperature: –15 °C

2. Condensing temperature: 30 °C

3. Temperature at compressor inlet: –15 °C (dry gas)

4. Temperature at expansion valve inlet: –25 °C (Subcooling temperature: 5 °C)

Performance Calculation Formulae

1. Refrigeration effect (Qe) = hₐ − hₑ

2. Compressor work (W) = hᵦ − hₐ

3. Condensing load (Qc) = hᵦ − hₑ = Qe + W

4. Coefficient of Performance (COP) = Qe / W

5. Compression ratio (Pr) = P₂ / P₁

• Comparative analysis of the Coefficient of Performance (COP) is performed for each refrigerant.

Video Clips for Product Usage

Introduction to Refrigeration & HVAC System and Education Curriculum

Youtube →

MANUAL DOWNLOAD