Teaching suggested applications*

-          Identification of the components of an air handling unit and a refrigeration unit with direct expansion.

-          Commissioning and controls of operation of the unit.

-          Measures of operating parameters (air temperature, relative humidity of the air, air velocity, and differential pressure).

-          Study of heat exchanges and transformation of the air (electric heating coil, direct expansion cooling coil, humidifier).

-          Plot of the air cycle on a psychometric diagram.

-          Plot of fan characteristic curve (pressure according to flow rate)

-          Study of the refrigeration cycle and plot the cycle on an enthalpy diagram

Description

The CRA530 bench allows the study of an industrial air handling unit single-flow type (a fan). It includes the classic elements of a network, namely: filters, a cooling coil, a cooling unit, a humidifier, a heating coil, a fan blower and mixing dampers.

Students will as a first step identify the components of the unit and the direction of air circulation.

They will then activate the system under conditions prescribed by the teacher (cooling mode or heating mode).

When the operation plan is established, then they must measure the operating parameters (temperature, humidity, air flow rate) with portable devices provided.

The next job is to exploit the measures by drawing the air cycle on a psychometric diagram and by calculating the powers of the exchangers.

The air handling bench also allows to study the refrigeration cycle through the direct expansion condensing unit.

 The robust design of this device makes it suitable for use in schools. The equipment is set up on an anodized aluminium frame on casters with wheels. This gives it great strength and a flexibility of integration into your premises. The manufacture of this equipment complies with the European standard for machinery manufacturing.

1. 1.   Outside air intake

outside air with inlet temperature simulation heaters

Heating resistors with fins

Power: 2500W

Power adjustable from 0 to 100%

1. 2.   Mixing damper

Mixing damper with manual control and position indication. The damper is comprised of 3 shutters: fresh air, mixing and return air

1. 3.   Filtration

A gravimetric coarse filter

A fine filter opacimetric

1. 4.   Cooling coil with refrigeration unit

Cooling coil with fins placed in the air handling ductwork.

Complete refrigeration unit with power of 2680W at 0°C/32°C

The unit includes all the accessories needed for operation:

Air condenser, inverter for the fan, liquid tank, thermostatic expansion valve, a suction line accumulator, HLP safety pressure switch, power control valve, low pressure manometer, high pressure manometer.

Condensate collection bin on the bottom

1. 4.   Steam humidifier

Adjustable steam flow rate: 0.4 to 4 kg/h

Steam rail made of stainless steel

Condensate collection bin on the bottom

• Electrical supply : 400 Vac – 50 Hz – 20 A
• Electrical network : 3 phase(s) + Neutral + Earth.
• Water supply : 1 L/min – 2 bars