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Binary Refrigeration Experimental Equipment

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Equipment Introduction

  • Binary refrigeration system experiment due to two type of refrigerant

  • Operation characteristic experiment by 2-stage side refrigerant type (R-404a, R-23)

  • Drawing Pressure-Enthalpy diagram with excel file data by using refrigeration utilities

  • Operating test about variation of evaporating pressure by using the evaporator

  • DAQ program supply tools with that temperature, pressure, enthalpy, amount of the exchanged heat in each position can be measured in real time, and then saved by Microsoft Excel, so that saved data can be show and analysis by graph

Education Contents

01. Measurement and Analysis a Binary refrigeration system using software

02. Performance measurement and analysis a Binary refrigeration system

03. Configuration manual sequence control circuit for Binary refrigeration system and operation

04. Operation manual control PLC programming for Binary refrigeration system and operation

05. Configuration temperature automatic control sequence circuit at No.1 cycle stage of Binary refrigeration system

06. Configuration temperature automatic control sequence circuit at No.2 cycle stage of Binary refrigeration system

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

  • Being practicable to operate on manual, thermal control or pump down with connecting by sequence or PLC control system

  • Function for specification of refrigerator performance automatic measuring & data acquisition and system monitoring program

  • Being practicable to measure temperature at each of compressor inlet and outlet, condenser inlet and outlet, expansion valve inlet and outlet, evaporator outlet, inside chamber and outside air using thermocouples of K-type

  • Measure of pressure : Being practicable to measure within the range of –1 ~ 35 bar at each of compressor inlet and outlet, condenser outlet, expansion valve inlet by pressure sensors which are installed

  • Experiment factors

- Refrigeration effect

- Compressor work

- Condensing effect

- Evaporating latent heat

- Amount of flash gas at expansion valve outlet

- Dry ratio and humidity at expansion valve outlet

- Coefficient of Performance

- Temperature and Pressure data which are measured

- Being saved on every minute until 1,440 min as excel file after click the “SAVE”

Mechanical refrigeration device component


Control panel device component


Dual Pressure Switch

DPS- Eng.jpg

Structure of DA100 Program

Application of data acquisition equipment

◈Composition of main user interface 

5000LT-main interface.png

(1) Schematic diagram of system show temp., press., (in realtime.)

(2) p-h chart.

(3) Data table for temperature, pressure and enthalpy.

(4) Sort of Calculation value like as COP, cooling capacity and heating capacity.

(5) Start switch and capture button.

◈ Binary Refrigeration Trainer 

① Main menu, It is for setting of software or hardware and initialization of resister information

② It is for select flow chart of each refrigeration system

③ The temperature and pressure data text are shown

④ It is for select p-h diagram of each refrigeration system

⑤ Performance data (qe, Aw, qc, qf, qr, x, y, COP) automatical calculated are shown

⑥ It is for start, stop, save data and finish of program and observe running statues

⑦ It is for saving flow chart and p-h diagram

P-h diagram 

5000LT-P-h diagram.png

Drawing each P-h diagram as each refrigerant 

(1) Condition

1) Evaporating temperature : -15℃

2) Condensing temperature : 30℃

3) Temperature at inlet of compressor: -15℃(Dry gas)

4) Temperature at inlet of expansion valve: -25℃(sub-cooling temp. 5℃)

(2) Formula

1) Refrigeration ability (Qe) = ha ― he

2) Compressor work (W) = hb ― ha

3) Condensing load (Qc) = hb ― he = Qe + W

4) Coefficient of performance (COP) = Qe/W

5) Compression Ratio (Pr) = P2/P1

(3) Comparing each Coefficient of performance as each refrigerant

Video clips for introduction

Video Introduction to Refrigeration.png

Introduction to Refrigeration & HVAC System and Education Curriculum

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