WL 440 Free and Forced Convection Educational School Laboratory Workbench Vocational Education Equipment Thermal Training Equipment
1. Product Introduction
1.1 Product Description
The WL 440 free and forced convection equipment is designed to help students understand and comprehend convection heat transfer, one of the three major heat transfer modes in thermodynamics. Convection heat transfer can be divided into natural convection and forced convection. Natural convection is caused by the uneven density of the spatial fluid due to the uneven temperature field of the spatial fluid. Forced convection is caused by the flow of fluid driven by external forces such as fans or pumps.
The WL 440 free and forced convection equipment is mainly composed of a vertical pipe with a detachable heating element, several sensors (including a handheld temperature probe), a waterproof electrical adapter box and a power supply box. The vertical pipe with a detachable heating element is the core component of the experimental bench. A temperature sensor (T1) is installed at the air inlet at the lower end of the vertical pipe, and a sensor for measuring wind speed is also installed above the T1 sensor. Three different types of heating elements can be installed in the middle of the vertical pipe, namely, a tube bundle heat exchanger, a cylindrical heat exchanger, and a plate heat exchanger. Each heat exchanger is equipped with a temperature sensor (T4). A 24V adjustable axial fan is installed at the upper air outlet of the vertical duct. A temperature sensor (T4) is installed below the axial fan. The handheld temperature probe (T3) can be inserted in the middle of the vertical duct (holes are reserved in the duct). Multiple sensor transmitters are installed in the waterproof electrical adapter box, which can transmit sensor data to the electrical box for processing.
1.2 Product Features
1. The product has a beautiful design, is sturdy and durable, has a small overall size, is plug-and-play, and has complete functions, which can meet the requirements of experimental teaching.
2. The product adopts a modular design and can carry out a variety of teaching and research experiments.
3. The accessories of the product can be installed quickly,
4. The product is equipped with a dedicated software to facilitate users to quickly obtain experimental data.
2. Technical specifications
2.1 Technical parameters
Power supply parameters: AC230V 50Hz
Flow cross-sectional area: 120x120mm; height about 0.6 meters
Heating element parameters:
Temperature limit: 90℃.
Tube bundle heating element parameters:
Number of tubes: 23; one tube in a variable position is heated.
Heating power: 20W; heat transfer area: 31,41cm2
Parameters of cylinder with uniform surface temperature:
Heating power: 20W; heat transfer area: 111cm2
Heating power: 40W; heat transfer area: 2x 100 cm2
Parameters of cylinder with heating foil:
Heating power: 40W; heat transfer area: 111cm2
Parameters of axial fan:
Maximum flow rate: 500m³/h; Maximum pressure difference: about 950Pa; Power consumption: 90W
Air speed: 0…10m/s
Temperature: 4x 0…325°C
Heating power: 0…50W
Required working environment conditions: Ambient temperature: -10℃～+40℃; Relative humidity: <85% (25℃).
2.2 Dimensions and weight
Dimension: 400*300*800mm
Weight: 22KG
3. Product component names and function introduction
3.1 Product main part
No Name
1 Axial fan
2 T2 thermometer
3 Handheld thermometer
4 Viewing window
5 Anemometer
6 T1 thermometer
7 Electrical waterproof box
8 Circuit breaker
9 Indicator light
10 USB port
11 Network interface
3.2 Product accessories
No Name
1 Cylinder with uniform surface temperature
2 Bundle-type experimental module
3 Cylinder with heating foil
4 Flat-type experimental module
5 Sensor data cable
6 USB data cable
7 Power cable
8 USB flash drive
4.Product Configuration List
No Name Qty
1 Axial fan 1
2 Temperature sensor 2
3 Handheld temperature sensor 1
4 Cylinder with uniform surface temperature 1
5 Bundle-type experimental module 1
6 Cylinder with heating foil 1
7 Flat-type experimental module 1
8 Sensor data cable 3
9 USB data cable 1
10 Power cable 2
11 Anemometer 1
12 Circuit breaker 1
13 Indicator light 1
14 USB interface 1
15 Network interface 1
5. Product teaching experiment list
(1) Natural convection and forced convection demonstration experiment
(2) Sweeping flat plate convection heat transfer experiment
(3) Sweeping cylinder convection heat transfer experiment with uniform surface temperature
(4) Sweeping tube bundle convection heat transfer experiment
(5) Sweeping cylinder convection heat transfer experiment with heating foil
