RA Series: REFRIGERATION & AIR CONDITIONING
RA2 Air Conditioning Unit - Issue 1
RA2 is a fully instrumented bench mounted air conditioning duct for teaching all aspects of air conditioning systems.
ORDERING SPECIFICATION
• Air Conditioning teaching system, complete with initial heating stage, humidifier, chiller/dehumidifier and final heating stage
• Transparent duct (200mm x 200mm) for complete visibility of the process
• Computer controlled via USB interface, with complete educational software including data logging, graph plotting with real time updates, mimic diagrams, data export, Educational software, replicating the psychrometric chart calculations
• 4 sets of Temperature and Relative Humidity measurements at the various stages of the process
• RH sensors come with calibration values which can be entered into the software for best accuracy
• Dual control of humidifier setting with a fast heat up setting and a gentle setting for control.
Features
> Transparent duct for full visibility of the process and the components
> Includes pre-heaters, humidifier, chiller/dehumidifier and reheaters
> Fully instrumented, with temperature and Relative Humidity sensors at every stage of the process, plus an air flow sensor
> RH sensors calibrated for maximum accuracy
> Suitable for both vocational training and for rigorous academic analysis of the thermodynamic principles involved
> Fully computer controlled with real time data logging of results (requires a PC not supplied by Armfield)
> Capability of using PID control for preheat, humidity and reheat allows stable conditions to be set up for investigations
Demonstration Capabilities
> Understanding and using psychrometric charts, relative humidity
and
humidity ratios
> Sensible Heating and Cooling of air
> Humidification and Dehumidification
> Understanding Enthalpy
Description
The duct is fabricated from clear acrylic for visibility and mounted on a painted steel frame. Air is drawn into the duct by a variable speed fan, and is passed through a flow straightener to the preheat heating elements. The air is then passed over a nozzle from a steam boiler, which allows the air to be humidified.
The next component in the duct is the evaporator of the integral refrigeration unit. As the air passes through the evaporator it is cooled down.
The evaporator housing allows any water which condenses from the air to be collected in an external vessel. After the evaporator the air passes over the reheat elements and out through a louvered exit.
Temperature and RH sensors are provided at the air inlet, after the preheat and humidifier, after the evaporator and after the reheat. The air flow is measured by an electronic sensor. The mains supply voltage is monitored in the equipment to allow calculation of effective heater powers.
Underneath the duct are mounted the steam boiler for the humidifier, the compressor and condenser for the refrigeration system and the electronic control box.
Software details
The equipment is controlled from a personal computer (not supplied) using a USB interface. Powerful software is supplied with detailed mimic diagrams, and full instructional help texts, comprehensive data logging and graph plotting facilities, together with sensor calibrations and a wide variety of display and data export options.
For more details of the capability of the Armfield software visit www.discoverarmfield.co.uk/data/armsoft
Technical details
Duct Size 200mm x 200mm
Air speed variable to > 1m/s
Preheaters 400W
Final Heaters 200W
Refrigerant R134a
Boiler Power 2KW nominal
Chiller Power 500W nominal
Ordering details
RA2-A/B/G
Fully instrumented bench mounted air conditioning duct for teaching all aspects of air conditioning systems.
Essential accessories
Personal Computer (PC), running Windows 98 or above, with spare USB port (not supplied).
Requirements/Order codes
Electrical Supply:
RA2-A 220-240V 50Hz 13A
RA2-G 230V 60Hz 13A
G version has optional 1.5kVA transformer available to accommodate 120V/1Ph/60Hz supply.
Shipping specification
Volume: 1.2m3
Gross weight: 150kg
Overall dimensions
Length: 1.72m
Width: 0.40m
Height: 0.50m
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