DESCRIPTION

RA3 is a floor standing unit, with all the features of the RA2 plus a recirculation feature via an enclosed chamber. Some of the air exiting the chamber can be recycled back into the conditioning duct.

The RA3 is a floor standing, self contained unit comprising a square ventilation duct mounted on a mild steel frame. The duct has a clear acrylic section allowing visibility of all components.

The air out of the duct is passed into a chamber to demonstrate climate control. The exit duct from the chamber is fitted with adjustable vents allowing some of the air to be recirculated back to the duct inlet.

Additional sensors measure the temperature and RH at the chamber outlet and after the recirculated air is mixed with the inlet air as well as the flow rate of the recirculated air.

Pressure gauges and temperature sensors allow the refrigerant temperature change across the condenser and evaporator to be established.

The refrigerant flow rate is measured using a variable area flow-meter.

EXPERIMENTAL CONTENT

• To investigate and understand the use of psychrometric charts, understand relative humidity (RH) measurements and the effect of temperature on RH and understand the Humidity Ratio
• To investigate sensible heating of air in a duct
• To investigate the humidification of air. To investigate the effect of vapor content and temperature on relative humidity
• To investigate dehumidification of air by cooling
• To investigate and understand the effect on enthalpy, understand relative humidity (RH) measurements and the effect of temperature on RH and understand the Humidity Ratio
• To investigate and understand recirculation and the effect on the system efficiency
• To investigate and understand recirculation and the effect on various aspects of the air conditioning cycle
• Heat transfer across the evaporator

FEATURES & BENEFITS

• Enclosed climate control chamber
• Adjustable recirculation of air leaving the chamber back into the conditioning duct
• Additional sensors, including refrigerant pressures and flow
• Transparent duct for visibility of the process and the components
• Pre-heaters, humidifier, chiller/dehumidifier and re-heaters
• Temperature and relative humidity (RH) 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
• 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

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