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ST300 Finned tube heat exchanger water/air engineering teaching equipment Heat Transfer Teaching Equipment
- Description
Tubular heat exchangers are often used for heating or cooling gaseous media, such as air coolers for internal combustion engines. Hot water flows in the tubes, which are surrounded by a flowing gaseous medium, eg cold air. The hot medium emits some of its thermal Energy to the cold medium.
The tubes are fitted with fins in order to increase the heat transfer surface and thus improve the convective heat transfer.
The ST300 trainer is used for quantitative investigations on a finned-tube heat exchanger using the media hot water and cold air. The core element of the trainer is an air duct with fan, in which a finned-tube heat exchanger is installed.
A streamlined inlSTelement and a flow straightener in the air duct provide a homogeneous flow for carrying out the experiment. The volumetric flow rate is adjusted via a throttle valve at the fan outlSTand measured by a taking nozzle at the inlSTinto the fan.
The trainer has a closed hot water circuit consisting of: water tank with heater, pump, adjustable flow rate, electromagnetic flow rate sensor and finned-tube heat exchanger. The flow rate can be adjusted via a valve.
In addition, a pressure sensor in the water circuit makes it possible to plot a pump characteristic.
Specification
Finned-tube heat exchanger to study convective heat transfer between water and air
Function of the heat exchanger as an air heater or water cooler
Closed hot water circuit with electric heater, thermostat, water tank and pump
Adjustable water and air flow
Determination of the air volumetric flow rate by differential pressure at
Digital display of temperatures, flow rates and pressure
Technical data
Finned-tube heat exchanger
Material: Cu/Al
Average transfer surface: 2,80m2 (air side)
Output: 2kW
Water temperature: 70°C
Pump
Power consumption: 470W
Max. flow rate: 4,2m3/h
Max. head: 20,5m
Fan
Power consumption: 0,25kW
Max. flow rate: 13m3/min
Max. pressure difference: 430Pa
Water tank: 28L
Heater: 2kW
Thermostat: max. 80°C
Measuring ranges
Temperature: 4x 0…100°C
Flow rate: water 0…6m3/h
Pressure: water 0…4bar abs.
Mass flow rate: air 0…250g/s
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases
UL/CSA optional
Required for operation
PC with Windows recommended
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Learning Objectives / Experiments
– thermal expansion of different materials such as PVC, PE, copper and steel
– determination of thermal expansion coefficients and the expansion force
– measurement of pipe elongation
– effect of varying pipe diameter
– expansion compensator
Specification
[1] investigating the thermal expansion of different pipe sections
[2] pipe sections can be selected by ball valves
[3] water connections made using quick-release couplings
[4] operation with hot and cold water supplies
[5] adjustment of the water temperature using mixing battery with thermocouple
[6] temperature measurement using battery-operated digital thermometer
[7] force measuring device to determine the expansion force
Technical Data
Pipe section length: 1000mm
Nominal diameters- PVC, PE, Cu: – Cu: – Steel: 1/2″
Mixing battery connection: 1/2″
Force measuring device
– spring rate per spring: 78N/mm
– total spring rate c: 156N/mm
Measuring range
– temperature: -50…90°C
Dimensions and Weight
LxWxH: 1650x700x1850mm
Weight: approx. 100kg
Required for Operation
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Learning Objectives / Experiments
– flow measurement
– differential pressure measurement
– effect of flow and surface roughness
– effect of the flow velocity
– effect of changes in pipe direction
Specification
[1] investigation of the pressure loss at pipe elements with different changes in pipe direction and materials
[2] pipe elements are commercially standard components in heating and sanitary engineering
[3] clear panel mounted on a sturdy, movable frame
[4] simply selection of the measuring sections via hose connection with quick-release couplings
[5] flow can be adjusted via valves
[6] flow measurement using rotameter
[7] differential pressure measurement via differential pressure meter with display
Technical Data
Measuring sections: 2300mm
– pipe section 1: steel, diameter: 1/2″, 90° pipe angle
– pipe section 2: steel, diameter: 1/2″, 90° pipe bend
– pipe section 3: copper, diameter: 18x1mm,90° pipe angle
– pipe section 4: copper, diameter: 18x1mm,90° pipe bend
Differential pressure meter
Measuring ranges- flow rate: 150…1600L/h- differential pressure: -350mbar…350mbar
Dimensions and Weight LxWxH: 1650x700x1850mmWeight: approx. 100kg
Required for Operation
Water connection: 1500L/h, drainTrainer for Various Heat Exchangers Thermal Lab Equipment Educational Equipment
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Specification
[1] examination and comparison of various heat exchanger types
[2] five different types of heat exchangers included in the scope of delivery
[3] finned heat exchanger with fan
[4] operating mode (parallel flow or counter flow) selectable via valves
[5] flow rates adjustable via valves
[6] electromagnetic flow meter
[7] digital displays for temperature, pressure differences and flow rate
[8] hot & cold water benches available for
independent operation
[9] water/steam heat exchanger unit and electrical steam
Generator available for further experiments
[10] software for data acquisition via USB under Windows Vista or
Windows 7
Technical Data
Plate heat exchanger, 10 plates
– heat transfer surface area: approx. 0,26m²
– capacity: 15kW
Tubular heat exchanger
– heat transfer surface area: 0,1m²
– heat transfer surface area (coil): 0,17m²
Shell and tube heat exchanger
– capacity: 13kW
Finned cross-flow heat exchanger
– heat transfer surface area: approx. 2,8m²
– max. flow rate fan: 780m³/h
– max. pressure difference fan: 430Pa
Jacketed vessel with stirrer
– heat transfer surface area (vessel): 0,16m²
– heat transfer surface area (coil): 0,17m²
Measuring ranges
– differential pressure air: 0…10mbar
– differential pressure water: 0…1000mbar
– flow rate: 0…3m³/h
– temperature: 0…100°C
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– Variables affecting energy efficiency
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* refrigerant supercooling
– Interconnected operation of compressors
– Operation of a multicompressor controller
– Methods for returning oil in a multicompressor refrigeration system
– Representation of the thermodynamic cycle in the log p-h diagramSpecification
[1] Refrigeration system in multicompressor operation to investigate energy efficiency
[2] Refrigeration circuit with 3 compressors connected in parallel, condenser, thermostatic expansion valve and coaxial coil heat exchanger as evaporator
[3] Heat exchanger for refrigerant supercooling can be added via valves
[4] Glycol-water circuit includes pump and tank with heater serving as cooling load at the evaporator
[5] Multicompressor controller for the parallel operation of the compressors
[6] Separation of oil from the refrigerant on the delivery side and return to the intake side of the compressors
[7] Fan at the condenser with adjustable speed
[8] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista
[9] Refrigerant R134a, CFC-free
Technical Data
3 compressors
– refrigeration capacity: each 1584W at -10°C/55°C
– power consumption: each 1156W at -10°C/55°C
Condenser with fan
– capacity: 4100W
– air flow: 1250m³/h
Coaxial coil heat exchanger capacity
– 4kW at ΔT=9K; 0,6m³/h glycol-water mixture
Glycol-water mixture pump
– max. flow rate: 5m³/h
– max. head: 6m
Heater power: 3kW
Tank
– glycol-water mixture: 23L
– refrigeration circuit receiver: 5,8L
Measuring ranges
– temperature: 4x 0…100°C, 4x -100°C…100°C
– pressure: 1x -1…9bar, 1x -1…24bar
– flow rate: 1x 1..25L/min
– compressor power: 0…4995W
Dimensions and Weight
l x w x h: 1800x700x1900mm
Weight: approx. 300kg
Connections
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Specification
Training panel for investigating the thermal expansion of different pipe sections
• Length of each pipe section 1200mm
• Pipe sections can be selected by ball valves
• Water connections made using quick action hose couplings
• Operation with hot and cold water supplies
• Adjustment of the water temperature using mixing battery with thermocouple
• Temperature measurement using battery-operated digital thermometer
• Force measuring device to determine the expansion force
• Pipe section length: 1000mm
• Nominal diameters: – PVC, PE, Cu: DN15 – Cu: DN8 – Steel: 1/2″
• Mixing battery connection: 1/2″
• Force measuring device: – spring rate per spring: 78N/mm – total spring rate c: 156N/mmHeat Transfer Bench Educational Equipment Thermal Training Equipment
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1 Product Overview
1.1 Profile
This product is an extensible educational experiment equipment for students to observe the heating, cooling and air movement of the device during operation. Students can observe the mixing of air and conduct tests to monitor temperature and air pressure. Grasp its control principle and control method, cultivate students’ corresponding knowledge and skills, suitable for higher vocational schools, engineering university, secondary vocational school and technical school related professional teaching and skills training evaluation.
1.2 Feature
(1) The training platform adopts an aluminum column frame structure with a universal wheel at the bottom for flexible movement. The desktop uses a 25mm thick high-density substrate, and the surface is treated with high-temperature and high-pressure fire-resistant panels. The structure is firm and beautiful. The instrument and power supply are integrated and installed, which is easy to use and not easily damaged.
(2) The training platform has a good safety protection system.
2 Technical specifications
(1) Input Power: AC220V±10% 60Hz
(2) Fan: Supply voltage: AC220V/50Hz Power: 1.5kW; Maximum flow rate: 2.160m3/h
(3) Overall dimensions: 2000mm x 750mm x 2100mm
(4) Overall capacity: <2.5KVA
(5) Weight: <100kg
(6) Working conditions: Ambient temperature -10°C to +40°C Relative humidity <85% (25°C)
3 Product introduction
3.1 Power control panel
(1)The power control panel adopts an aluminum alloy frame and a closed box structure, which is integrated with the placement rack below.
(2)Configured with circuit breaker, power indicator, temperature adjustment knob, thermometer, power socket, differential pressure gauge, thermostat and intelligent electrical parameter measuring instrument
(3)The power input is controlled by the leakage breaker and the emergency stop control button is provided. In case of emergency, you press emergency stop button is so as to cut off the power.
3.2 Training workbench
(1)Training workbench:
The training table is supported by aluminum pillars, and the bottom universal wheel has a brake that can be moved and positioned flexibly. The desktop uses a 25mm thick high-density substrate, and the surface is treated with high-temperature and high-pressure fire-resistant panels. The structure is firm and beautiful.
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Specification
[1] investigation of the pipe friction in laminar or turbulent flow on Hydraulic Bench
[2] transparent tank with overflow ensures constant water inlet pressure in the pipe section for experiments with laminar flow
[3] water supply via Base Module ( Hydraulic Bench) or via laboratory supply for experiments with turbulent flow
[4] flow rate adjustment via valves
[5] twin tube manometer for measurements in laminar flow
[6] dial-gauge manometer for measurements in turbulent flow
[7] flow rate determined by base module Hydraulic Bench
[8] water supply using base module ( Hydraulic Bench) or via laboratory supply
* Diameter of test pipe : 3.0mm ( Bore)
* Length of test pipe : 524mm
* Needle Valve included to regulate flow rate
length: 1000mm – Pipe section 1: acrylic 20×1.5mm – Pipe section 2: steel 1/2″ –
Smooth-bore pipes of various diameters Size – 6mm , 10mm, 17mm
Overall dimensions:
* Height : 1.05m form the ground level
* Width : 2.25m
* Depth : 0.43m
Test Pipe Diameters:
The Pipe network should have 90° Bends, 90° elbow,90°T, 45°elbow & Y.
Sudden enlargement
Sudden contraction
Ball Valve
Gate Valve
Globe valve
Inline strainer
Venturi made of clear acrylic
orifice palte made of clear acrylic
Pitot Static tube section made of clear acrylic
EXPERIMENTAL CAPABILITIES
Laminar to turbulent flow regimes in pipes
Energy losses in pipe fittings and bends
Flow measurement using venturi meter
Flow measurement using orifice plate
Use of pitot static tube
Use of manometers
