Experiments

  • Investigation of convection processes.
  • Comparison of heat transfer for different heating elements.
  • Comparison between different heating elements.
  • Demonstration of the relationship between heat transfer, area of heat transfers and flow velocity (Nusselt).
  • Demonstration of experiments with a crossflow heat exchanger

Specifications

  • Frame made of stainless steel
  • Process flow diagram in front of panel
  • Experimental rectangular section made of stainless steel
  • Centrifugal fan for forced convection
  • Anemometer for air flow measurement
  • Adjustable air flowrate
  • Heating of an air flow using heating elements, heating power adjustable with digital indicator.
  • Heating elements: pipe (single tube), pipe bundle (Pinned multi tube), finned pipe bundle.
  • Electronic sensors for temperature, differential pressure, power with digital indicator.
  • Piping and valves of stainless steel (where necessary)
  • Safety devices and control for protection of system
  • Emergency push button
  • Autonomous pilot unit with computerized control software
  • UPS with significant backup to shut down the plant in the event of a power outage
  • Computer system for the Acquisition of data from plant
  • Data acquisition via USB under Window
  • Spares will be supplied for smooth operation for the period of 1 year.
  • The unit will be provided with all required accessories for smooth running, gases with cylinders (where required), calibration kits (if required), installation & after-sale services, maintenance services and operational manuals

Heat transfer is the most common phenomenon in many practical applications in energy conservation, transmission and utilization. Heat exchangers play a very important role in energy conservation, transmission and utilization. Cross Flow Heat Exchangers are one of the most common types of heat exchanger used in countless applications such as automotive radiators, heater cores, condenser & evaporators of HVAC etc. The unit Cross Flow Heat Exchanger is designed to enables the students to understand the heat transfer rates by free & forced convection. It consists of a vertical air duct. Air is drawn through the duct with the help of a fan. A digital display on the front of the instrumentation unit allows the students to view all experimental data.

The experimental unit mainly comprises a vertical air duct. A fan draws the air through the duct. Interchangeable heaters dissipate heat directly into the air flow. The following heater elements are included: pipe, pipe bundle and finned pipe. To investigate the effect of the flow in the pipe bundle, the heater insert can be positioned in different pipe rows.

Electronic sensors are used to take measurements. The measured values are indicated digitally on the display unit and transferred directly to a PC (optional). Software for data acquisition is optional. The software enables, among other aspects, the measured data to be recorded and stored. The flow rate, Reynolds and Nusselt numbers are calculated, temperature-time relation and the dependence of the Nusselt number on the Reynolds number can be demonstrated graphically.

Technical Data

  • Flow cross-section: 120x120mm
  • Length: 1250mm

 Radial fan

  • Max. power consumption: 250W
  • Max. pressure difference: 430Pa
  • Max. velocity: 0~15m/s
  • Max. flow rate: 25m3/min

Heating elements

Single Tube

  • Power: 1x 500W
  • Heating surface: 1x approx. 0.01m2
  • Number of tubes: 1

Pipe bundle

  • Power: 1x 500W
  • Heating surface: 1x approx. 0.002m2
  • Number of tubes: 20

Fined pipe bundle

  • Power: 1x 500W
  • Heating surface: 1x approx. 0.014m2
  • Number of tubes: 9

 Measuring ranges

  • Temperature: 2x -100~400°C
  • Power: 0~500W
  • Differential pressure: 0~10mbar

 Software TH-3115SW

DAQ software specially designed in National Instrument™, LABVIEW™ environment to measure and calculate the results of apparatus. The software is optional and while using software a set of electronic sensors are included. Software can be run with any Windows™ environment.

 Scope of Delivery

  • 1 experimental unit
  • 1 tube element
  • 1 pipe bundle
  • 1 finned pipe bundle
  • 1 instructional manual