General Characteristics:
A benchtop refrigeration circuit demonstration unit designed to enable students to study, investigate, and observe the sequential stages of the refrigeration cycle, including the Coefficient of Performance (COP), Superheat, and Subcooling conditions.
Refrigeration Circuit Demonstration Unit - Sub-assemblies
1.1 Compressor: Detailed as follows:
1.1 Hermetic reciprocating type.
1.2 Cooling capacity ≥ 300 Watts (not less than 300 Watts).
1.3 Size ≥ 1/8 Horsepower (HP) (not less than 1/8 HP).
1.4 Operates with R134a refrigerant.
1.5 Equipped with an electromechanical pressure switch acting as a protective device.
1.6 For demonstration and performance analysis of vapor-compression refrigeration cycle or heat pump cycle; capable of suctioning low-pressure refrigerant at ≤3 bar (not more than 3 bar) and generating high-pressure refrigerant at ≥ 8 bar (not less than 8 bar).
1.2 Condenser: Detailed as follows:
2.1 Cylindrical tank constructed of acrylic or transparent glass, with a volume ≥ 3 Liters (not less than 3 Liters).
2.2 Equipped with a helical copper coil with an outer diameter (OD) ≥ 1/4 inch, with ≥ 12 turns (coils) (not less than 12 turns).
2.3 Heat transfer area ≥ 0.08 m² (not less than 0.08 m²).
2.4 Fitted with a K-type thermocouple.
1.3 Evaporator: Detailed as follows:
3.1 Cylindrical tank constructed of acrylic or transparent glass, with a volume ≥ 3 Liters (not less than 3 Liters).
3.2 Equipped with a helical copper coil with an outer diameter (OD) ≥ 3/8 inch, with ≥ 7 turns (coils) (not less than 7 turns).
3.3 Heat transfer area ≥ 0.04 m² (not less than 0.04 m²).
3.4 Fitted with a K-type thermocouple.
1.4 Thermostatic Expansion Valve (TEV):
For demonstration and performance analysis of vapor-compression refrigeration cycle or heat pump cycle; capable of producing refrigerant outlet temperature ≤ 3 °C (not higher than 3 °C).
1.5 Peristaltic Pump: Detailed as follows:
5.1 Maximum flow rate ≥ 300 ml/min (not less than 300 ml/min).
5.2 Operates on 24 Volts Direct Current (24V DC).
1.6 Refrigeration Pipework System: Detailed as follows:
6.1 Equipped with both high-pressure and low-pressure switches.
6.2 Pressure Gauges for R134a refrigerant:
6.2.1 Low-pressure side range: -1 to +21 bar, or wider.
6.2.2 High-pressure side range: -1 to +25 bar, or wider.
6.3 Pressure Transducers:
6.3.1 Low-pressure side range: -1 to +15 bar, or wider.
6.3.2 High-pressure side range: -1 to +15 bar, or wider.
6.4 Equipped with a refrigerant filter/dryer for moisture absorption and particulate filtration.
6.5 Equipped with a liquid sight glass inside the pipeline.
6.6 K-type thermocouples installed at ≥ 4 specific measurement points:
6.6.1 Suction Line Temperature.
6.6.2 Discharge Temperature.
6.6.3 Thermostatic Expansion Valve (TEV) Inlet Temperature.
6.6.4 Thermostatic Expansion Valve (TEV) Outlet Temperature.
1.7 Instrument Control Panel: Detailed as follows:
7.1 Equipped with an LCD screen displaying refrigerant pressure and temperature values, as well as water temperature values.
7.2 Equipped with an On/Off switch for the compressor.
7.3 Equipped with an On/Off switch for the water pump.
7.4 Equipped with pressure measurement ports ≥ 2 ports.
7.5 Equipped with K-type thermocouple connection ports ≥ 4 ports for the refrigerant circuit, and ≥ 2 ports for the water circuit.
7.6 Equipped with status indicator lights for low-pressure and high-pressure warnings.
1.8 Software Interoperability:
Fully compatible and operational in conjunction with the software specified in Section 2.
1.9 Spare Parts:
Includes spare parts provided for replacement, comprising at least: Compressor, Evaporator, and Condenser.
Data Acquisition and Display Software (Pre-installed on Item 3 Computer)
1 Capable of recording experimental data both automatically and manually.
2 Capable of displaying and recording real-time experimental values.
3 Capable of displaying experimental parameters and thermodynamic diagrams.
4 The software must be a product bearing the exact same trademark (ShouldShine) as the demonstration unit.
Data Processing Computer (1 Set)
1 Central Processing Unit (CPU) with ≥ 8 cores and ≥ 8 threads, featuring dynamic frequency scaling technology (Turbo Boost or Max Boost) with a maximum clock speed ≥ 4.6 GHz (1 unit).
2 CPU equipped with unified cache memory at the same level ≥ 16 MB.
3 Graphics processing unit meeting either of the following features, or better:
3.1 Dedicated graphics board separate from the mainboard with memory ≥ 2 GB; OR
3.2 Integrated graphics processing unit inside the CPU capable of utilizing system memory for display ≥ 2 GB; OR
3.3 Graphics processor capable of allocating shared system memory ≥ 2 GB.
4 Main memory (RAM) of DDR5 type or better, with capacity ≥ 16 GB.
5 Solid State Drive (SSD) storage with capacity ≥ 500 GB (1 unit).
6 Network Interface connector of 10/100/1000 Base-T or better, ≥ 1 port.
7 USB 2.0 or better interface connectors ≥ 3 ports.
8 Pre-installed operating system: Windows 11 or better.
9 Keyboard and mouse bearing the exact same brand/trademark as the CPU and display monitor.
10 Display monitor with screen size ≥ 23 inches.
Instrument Workbench Table (1 Unit)
1 Dimensions ≥1000 x 700 x 750 mm (Width x Length x Height).
2 Main structure fabricated of metal; tabletop constructed of wood overlaid with PVC or melamine surface.
Computer Desk (1 Unit)
1 Dimensions ≥ 1100 x 550 x 700 mm (Width x Length x Height).
2 Equipped with a sliding keyboard tray on guide rails.
3 Main structure fabricated of metal; tabletop constructed of wood overlaid with PVC or melamine surface.
Computer Chair (1 Unit)
1 Dimensions ≥ 580 x 630 x 900 mm (Width x Length x Height).
2 Height-adjustable mechanism.
3 Base frame structure manufactured of metal.
Uninterruptible Power Supply - UPS (1 Unit)
1 Power capacity ≥1000VA.
2 Operates on True on-line double conversion design topology.
3 Uses Sealed Lead Acid Maintenance Free battery type.
4 Equipped with MIMIC LCD Display showing operating statuses of at least: UPS status, Load level, Battery level, Input/output voltage, Remaining backup time, and Fault conditions.
5 Equipped with audible alarm warnings for at least: Battery mode, Low Battery, Overload, and Fault.
6 Certified in compliance with Thai Industrial Standards (TIS / มอก.).
Wireless Smart Temperature Sensor Set (2 Sets)
1 Wireless sensor connecting via Bluetooth, compatible with tablets (iOS / Android) and smartphones (iOS / Android), with free downloadable application:
1.1 Capable of displaying real-time numerical measurement values.
1.2 Capable of displaying measurement values in Graphic Gauge format.
1.3 Capable of displaying measurement values as real-time graphs plotted against time in seconds.
1.4 Capable of setting data transmission sampling rate during active measurement.
1.5 Capable of exporting data files and sharing via email or Line application; recorded measurement data files must be directly openable in Microsoft Excel.
2 Temperature measurement range covering -40 °C to +125 °C.
3 Measurement resolution ≤0.01 °C (0.01 °C or finer).
4 Maximum data transmission rate ≥ 10 Hz.
5 Ingress protection rating against dust and water ≥ IP67.
Maintenance Refrigerant Supply
9.0 R134a refrigerant for fluid replacement during equipment maintenance, provided in a quantity of ≥ 2 maintenance cycles.
