KTE-2000EP
EVAPORATION PRESSURE PARALLEL CONTROL EQUIPMENT
Equipment Introduction
Refrigerant Distribution Measurement
Measurement and analysis of refrigerant distribution by varying the operating temperatures of low-temperature and high-temperature evaporators
Refrigerant Distribution Performance Analysis
Evaluation of refrigerant distribution characteristics and their effects on overall refrigeration system performance
Evaporating Pressure Variation Tests
Operational testing of evaporating pressure variation through controlled operation of multiple evaporators
Real-Time Data Acquisition and Analysis
The supplied DAQ program enables real-time measurement of temperature, pressure, enthalpy, and heat transfer rate at each measurement point. All measured data can be saved in Microsoft Excel format and further analyzed using graphical visualization tools
Equipment Characteristics
System Configuration
Compressor → Condenser → Filter Dryer → Sight Glass → Solenoid Valve → Manual Expansion Valve →Low-Temperature Evaporator (with check valve at outlet) →High-Temperature Evaporator (with Evaporating Pressure Regulator, EPR, at outlet) →Accumulator → Compressor
Operation and Control
The system can be operated in manual mode, temperature control mode, or pump-down mode. Operation is performed through sequence control circuits or a PLC-based control system, allowing flexible control and safe system operation.
Performance Measurement and Monitoring
The system provides automatic measurement of refrigeration performance, real-time data acquisition,and system monitoring through a dedicated software program.
Temperature Measurement
Temperature is measured using K-type thermocouples at the following locations:
Compressor inlet and outlet
Condenser inlet and outlet
Expansion valve inlet and outlet
Evaporator outlet
Inside chamber
Ambient (outside air)
Pressure Measurement
Pressure can be measured within a range of –1 to 35 bar using installed pressure sensors at:
Compressor inlet and outlet
Condenser outlet
Expansion valve inlet
Experimental Parameters
Refrigeration effect
Compressor work
Condensing effect
Evaporating latent heat
Amount of flash gas at the expansion valve outlet
Dryness fraction and humidity at the expansion valve outlet
Coefficient of Performance (COP)
Measured temperature and pressure data
Data Logging Function
Measured data can be saved at one-minute intervals for up to 1,440 minutes by clicking the “SAVE” button. All data are stored in Microsoft Excel format, enabling long-term analysis and comparison of operating conditions.
Education Contents
Measurement and Analysis of an Evaporation Pressure Parallel Control Refrigeration System Using Software
Measurement and performance analysis of an evaporation pressure parallel control refrigeration system using dedicated software tools.
Performance Analysis of an Evaporation Pressure Parallel Control System
Evaluation of system behavior and performance characteristics under various operating conditions.
Manual Control Sequence Circuit Configuration and Operation
Configuration and operation of manual control sequence circuits for the evaporation pressure parallel control system.
Manual Control PLC Programming and Operation
PLC programming and operation for manual control of the evaporation pressure parallel control system.
Automatic Temperature Control Sequence Circuit Configuration and Operation
Configuration and operation of automatic temperature control sequence circuits for the evaporation pressure parallel control system.
Automatic Temperature Control PLC Programming and Operation
PLC programming and operation for automatic temperature control of the evaporation pressure parallel control system.
Low-Temperature / Low-Pressure Series Control Sequence Circuit Configuration and Operation
Configuration and operation of low-temperature and low-pressure series control sequence circuits.
Low-Temperature / Low-Pressure Series Control PLC Programming and Operation
PLC programming and operation for low-temperature and low-pressure series control of the system.
Pump-Down Sequence Control Circuit Configuration and Operation
Configuration and operation of pump-down sequence control circuits for the evaporation pressure parallel control system.
Pump-Down Control PLC Programming and Operation
PLC programming and operation for pump-down control of the system.
Compulsory Pump-Down Sequence Control Circuit Configuration and Operation
Configuration and operation of compulsory pump-down sequence control circuits for system safety and protection.
Compulsory Pump-Down PLC Programming and Operation
PLC programming and operation for compulsory pump-down control of the evaporation pressure parallel control system.
System Description
Mechanical Refrigeration Device Component
Control Panel Device Component
Dual Pressure Switch
The Dual Pressure Switch (DPS) integrates a high-pressure switch (HPS) and a low-pressure switch (LPS) into a single housing.
It consists of internal mechanical components such as bellows, levers, and contact setting screws, forming two independent electrical contact sets for pressure control and protection.
The high-pressure switch (HPS) is a manual reset type and is activated when an abnormal rise in discharge pressure occurs at the compressor outlet. Typical causes include condenser blockage, refrigerant flow restriction, or freezing of the expansion valve.
The low-pressure switch (LPS) is activated when an abnormal drop in suction pressure occurs at the compressor inlet, such as during refrigerant leakage, insufficient refrigerant charge, or airflow reduction at the evaporator.
When either the suction or discharge pressure exceeds the allowable operating range, the DPS interrupts compressor operation to prevent system damage.
In refrigeration piping and tubing systems, this device is used to control compressor start and stop based on pressure conditions, serving as a critical safety protection device rather than a performance control component.
Structure of DA100 Program
Refrigeration Utility Program
The Refrigeration Utility Program allows users to analyze and evaluate refrigeration system performance by selecting the appropriate system cycle and operating conditions.
System Cycle Selection
Users can select the desired refrigeration cycle type from the “Select Cycle Type” menu:
One-Stage Cycle
Two-Stage Cycle
Operating Conditions
During system operation, the following parameters can be entered or monitored:
Evaporating temperature (°C) or evaporating pressure (bar)
Condensing temperature (°C) or condensing pressure (bar)
Refrigeration Parameters
Superheat: Superheating temperature (K) from the evaporator outlet to the compressor inlet
Subcooling: Subcooling temperature (K) from the condenser outlet (or saturated liquid line on the P–h diagram) to the expansion valve inlet
Pressure / Temperature Differences
ΔP Evaporator: Difference in temperature or pressure between the expansion valve outlet and the evaporator outlet
ΔP Condenser: Difference in temperature or pressure between the condenser inlet and the expansion valve inlet
ΔP Suction Line: Difference in temperature or pressure between the evaporator outlet and the compressor inlet
ΔP Liquid Line: Difference in temperature or pressure at the expansion valve inlet after the expansion process
ΔP Discharge Line: Difference in temperature or pressure between the compressor outlet and the condenser inlet
Evaporation Pressure Parallel Control Trainer (E.P.R Control Program)
The Evaporation Pressure Parallel Control Trainer provides an interactive interface for monitoring, control, and analysis of parallel evaporating pressure systems.
Main Menu
Used for software and hardware configuration, system settings, and initialization of registered information.
System Flow Chart Selection
Selection and display of the flow chart corresponding to each refrigeration system configuration.
Real-Time Data Display
Real-time visualization of measured temperature and pressure data in text format.
P–h Diagram Selection
Selection and display of the pressure–enthalpy (P–h) diagram for each refrigeration system.
Automatic Performance Calculation
Automatic calculation and display of performance parameters, including:
Refrigeration effect (qₑ)
Compressor work (Aᵥ)
Condensing heat (q꜀)
Flash gas (q𝒻)
Reheating heat (qᵣ)
Dryness fraction (x, y)
Coefficient of Performance (COP)
Program Control Functions
Functions for start, stop, data saving, program termination, and monitoring of operating status.
Data and Diagram Storage
Saving of system flow charts and P–h diagrams for documentation and further analysis.
Video Clips for Product Usage
