KTE-2000EP

Evaporation Pressure Parallel Control Experimental Equipment

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Equipment Introduction

  • Refrigerant distribution measuring test by changing temperature of the low and high temperature evaporator

  • Testing refrigerant distribution effect for the refrigerator

  • 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 Evaporation pressure parallel control Refrigeration system using software

02. Measurement and Analysis of a Evaporation pressure parallel cotrol system

03. Configuration manual control sequence circuit for Evaporation pressure parallel control system and operation

04. Configuration manual control PLC programming for Evaporation pressure parallel control system and operation

05. Configuration temperature automatic control sequence circuit for Evaporation pressure parallel control system and operation

06. Configuration temperature automatic control PLC programming for Evaporation pressure parallel control system and operation

07. Configuration low temperature low pressure series circuit sequence circuit for Evaporation pressure parallel control system and operation

08. Configuration low temperature low pressure series circuit PLC programming for Evaporation pressure parallel control system and operation

09. Configuration pump down sequence control circuit for Evaporation pressure parallel control system and operation

10. Configuration pump down control circuit PLC programming for Evaporation pressure parallel control system and operation

11. Configuration compulsory pump down sequence control circuit for Evaporation pressure parallel control system and operation

12. Configuration compulsory pump down PLC programming for Evaporation pressure parallel control system and operation

Equipment Characteristics

  • Cycle composition : Compressor → Condenser → Filter Dryer → Sight Glass → Solenoid Valve → Manual Expansion Valve → Low Temperature Evaporator (installed a check valve at outlet) → High Temperature Evaporator (installed an E.P.R at outlet) → Accumulator → Compressor

  • 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”

System Description

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Mechanical refrigeration device component

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Control panel device component

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Dual Pressure Switch

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  • Dual Pressure Switch (DPS) consists of high low pressure switch and low pressure switch in a case. On contacts part like as bellows, lever and contact setting screw, these contacts is a fair of 2. High pressure control is return type HPS (high low pressure switch), this switch is used when abnormal raising of compressor outlet (ex. clogging of tube, freezing of expansion valve), and LPS (low pressure switch) is used when abnormal down of intaking pressure.

  • When all pressure of intake and emit are not normal, the system can not work. In other words, on piping and tubing part in refrigeration system this device is used in control of compressor working/stop. it is just for safety device.

Structure of DA100 Program

Application of data acquisition equipment

◈Composition of main user interface 

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◈ Application Refrigeration Utility Program 

(1) Choose your respecting refrigeration system cycle on 'Select cycle type'

① One stage cycle

② Two stage cycle

(2) Evaporating Temperature (℃) or evaporating pressure (bar) on running.

(3) Condensing Temperature (℃) or condensing pressure (bar) on running.

(4) Superheat : Superheating temperature (˚K) from outlet of evaporator to inlet of compressor.

(5) Sub Cooling : Sub cooling temperature (˚K) from outlet of condenser (or saturating line on p-h chart) to in front of expansion valve.

(6) DP Evaporator : Temperature (or pressure) Difference between outlet of expansion valve and outlet of evaporator.

(7) DP Condenser : Temperature (or pressure) Difference between inlet of condenser and inlet of expansion valve.

(8) DP Suction line : Temperature (or pressure) Difference between outlet of evaporator and inlet of compressor.

(9) DP Liquid line : Temperature (or pressure) Difference at inlet of expansion valve after isolation expansion process.

(10) DP Discharge line : Temperature (or pressure) Difference between outlet of compressor and inlet of condenser.

Evaporation Pressure Parallel Control Trainer (E.P.R Control) 

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

Video clips for introduction

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Introduction to Refrigeration & HVAC System and Education Curriculum