Computerized Refrigeration Circuit with Variable Load

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Computerized Refrigeration Circuit with Variable Load

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Computerized Refrigeration Circuit with Variable Load Specification

Port Size
1/4 inch and 3/8 inch SAE flares

Equipment Type
Computerized Refrigeration Circuit with Variable Load

Resolution
Temperature 0.1C, Pressure 0.1 bar

Humidity
20% 80% RH (non-condensing)

Specimen Size
Bench top configuration (~700 mm 500 mm footprint)

Temperature
0C to 50C (ambient), -20C to 20C (test chamber)

Power Supply
230 V AC, 50 Hz

Application
Refrigeration & air-conditioning education, laboratory experiments, performance testing

Gas Pressure
0 30 bar (depending on refrigerant)

Max Height
550 mm (approx. unit height)

Display Type
Digital display & PC graphical interface

Frequency
50 Hz

Mounting Type
Bench top

Hardness
N/A (not applicable)

Operating Voltage
230 V AC

Accuracy
Temperature 0.5C, Pressure 1% F.S.

Test Range
Variable load operation from 20% to 100%

Interface Type
USB / RS232 for PC connectivity

Automation Grade
Automatic

Measuring Range
-30C to 50C (temperature sensors), 030 bar (pressure sensors)

Number of Specimens
One complete refrigeration circuit

Response Time
<1 second (for all sensors)

Features
Variable electronic load, real time data logging, safety protection, automated test sequences

Usage
Educational, demonstration, laboratory analysis

Capacity
1/4 HP to 1/2 HP compressor, 250500 W cooling

Machine Weight
Approx. 60 kg

Test Speed
Variable, up to 1200 RPM (for compressor motor)

Test Width
Adjustable as per circuit configuration

Test Stroke
N/A (not applicable for circuit)

Control Mode
Computerized, PLC based automatic control

Data Acquisition
PC connected, real-time logging included

Software Features
Graph plotting, report generation, fault simulation

Compressor Type
Hermetically sealed rotary or reciprocating

Condenser Type
Air-cooled

Safety Features
High/low pressure cutout, over-temperature trip, earth leakage protection

Cooling/Heating Load Range
01200 W (electronic load bank)

Sensor Types
RTD (Pt100), pressure transducers

Load Adjustment Mechanism
Electronic/heater bank with PID control

Supported Standards
IS, ASHRAE test procedures

Noise Level
<60 dB at 1 meter

Cycle Components
Sight glass, expansion valve, solenoid valve, filter drier

Evaporator Type
Fin & tube or plate heat exchanger

Refrigerant Types Supported
R134a, R22, R404a (specify at order)

Accessories Included
Instruction manual, software CD, PC interface cable

Ambient Operating Conditions
0C to 45C, <80% RH

About Computerized Refrigeration Circuit with Variable Load

The data acquisitionSystem includes the following sensors:

1)8 temperaturessensors connected to the supervision system at:

a)Expansion valveinlet and Outlet b)Compressor inlet and Outlet

c)Condenser inletoutlet

d)Evaporator Inletand outlet

2)2 pressure sensors

a)Low pressure(inlet compressor)

b)High pressure(outlet compressor)

3)1 electrical powerconsumption of the compressor

4)1 Electrical powerconsumption of load

The software isdivided in two parts. The first part is the schematic diagram with the displayof all the data, the second is the graph (plot the data in real time)

Total Equipment isskid mounted in SS 40 x40 Frame Structure with Castor wheels. All wetted partsalso made of SS-304

Compressor

Refrigerationcapacity: approx. 479W at 7,2/54,4C

power consumption:168W at 7,2/54,4C

Evaporator

Refrigerant volume:0,4L

Water volume:0,8LCondenser

Transfer area:approx. 1,25m2

Fan powerconsumption: 4x 12WPump

Max. flow rate:1,9m3/h

Max. head: 1,4mTank

Volume: approx. 4,5L

Heater: approx.450WRefrigerant: R134A Filling volume: 800gMeasuring ranges Pressure: 2x-115bar

Power: 0750W

Temperature: 6x0100C

Flow rate:

Water 0,051,8L/min

Refrigerantcalculated 017kg/h

Touch screen basedFully automatic system with password protection Data acquisition should beRemotely operated by Smart phone, Tablets, PC,

laptops via Ethernetand Wi-fi

Should be equippedwith all safety protections Flow visualization should be available in the DAQSystem

Should be equippedwith both manual and auto operation

Power consumption ofindividual system, all sensors data should be display and logged automatically

System should havesoftware for operating, data logging, processing and data displayingPerformance variables (e.g., Heating/Cooling COP, Heating / Cooling load etc..)should be automatically calculated and displayed and should be stored in pendrive also along with PC. Instruments should be provided with 3D drawing ofcomplete equipment along with the name and make of all standard components usedin the test rig

Each rig should have small aestheticallyappealing poster with schematic diagram and basic working detail.

Advanced Variable Load Design

Harness precise electronic load control, adjustable from 20% to 100% (up to 1200 W), enabling seamless simulation of diverse operating scenarios for both performance testing and educational analysis. The integrated PID control maintains stability and replicates real-world operation, essential for comprehensive laboratory investigations and demonstrations.

Flexible Component Configuration

Select from rotary or reciprocating hermetically sealed compressors and alternate between various refrigerants such as R134a, R22, or R404a based on experimental needs. Swappable evaporators (fin & tube or plate) and accessible test points allow hands-on learning about different cycle arrangements and their impact on refrigeration efficiency.

Comprehensive Data Capture & Safety

Real-time sensor data-temperature, pressure, and more-is transmitted to a PC for logging, visualization, and report generation. The advanced safety suite includes high/low pressure cutout, over-temperature trip, and earth leakage protection, ensuring secure operation in all laboratory environments.

FAQ's of Computerized Refrigeration Circuit with Variable Load:

Q: How does the computerized refrigeration circuit enable variable load operation?

A: The system utilizes an electronic or heater bank load, adjustable via computer-based PID control, allowing modulation of test conditions from 20% up to 100% of capacity (0-1200 W). This enables simulation and analysis of different refrigeration loads in real time.

Q: What is the process for changing refrigerant types in this equipment?

A: Refrigerant type (R134a, R22, or R404a) should be specified when ordering. Replacement or retrofitting of refrigerants must be performed by qualified personnel, following standard service protocols and ensuring compatibility with the selected compressor and components.

Q: When should safety features be checked or tested?

A: Safety systems-including high/low pressure cutouts, over-temperature trip, and earth leakage protection-should be inspected before each operational cycle, and periodically tested according to laboratory safety guidelines to ensure proper protection.

Q: Where can the computerized refrigeration circuit be used most effectively?

A: This system is ideally used in academic settings, lab-based training environments, and research facilities for refrigeration and air-conditioning technology, where hands-on demonstration and performance testing are required.

Q: What are the benefits of PC-based control and data acquisition?

A: PC-based operation offers real-time data logging, graphical visualization, automated test sequencing, and the ability to generate reports or simulate faults, enhancing both instructional effectiveness and research accuracy.

Q: How is test data displayed and managed?

A: All sensor data, including temperature and pressure, are digitally displayed and simultaneously logged to the PC. The included software offers comprehensive graph plotting and reporting options for convenient analysis and documentation.

Q: What accessories and standards are supported with this refrigeration circuit?

A: Each unit comes with an instruction manual, software CD, and PC interface cable. It adheres to IS and ASHRAE test standards, ensuring comparability and reliability for both instructional and experimental applications.

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