Features

• Compact, comprehensive, sturdy design  
• Smooth and silent operation  
• Total instrumentation for complete heat balance  
• Concentric Tube, Shell and tube, Tubular concentric pipe, Jacketed Vessel and Plate type heat exchangers  can be studied. 

Description
Tesca Computer Controlled Multi-heat Exchanger Trainer  is designed to  determine effectiveness of: Concentric Tube Heat Exchanger; Plate Heat Exchanger; Shell & Tube  Heat Exchanger; Tubular Heat Exchanger; Jacketed Vessel Heat Exchanger: Turbulent Flow  Heat Exchanger & Coil Vessel Heat Exchanger in Parallel Flow & Counter Flow Configuration. It  consists of Heat Exchangers mounted on a powder coated Steel Frame. Water is heated in a sump tank by  electric heaters & pumped to Heat Exchangers by a pump. Cold water is supplied to the Heat Exchangers from  tap water connection in lab. The hot water temperature can be set to required value on a temperature controller. Shell & tube Heat Exchanger unit is replaced by ‘Concentric Tube ‘or ‘Tubular Heat Exchanger’ or ‘Jacketed  Vessel’ or ‘Plate type Heat Exchanger’ or Coil Vessel Heat Exchanger to carry out similar experiments in this  trainer.  

Measuring instruments are provided to measure Temperature of Water, flow of Hot & Cold Water. The  measured parameters are displayed by data logger.  

The data logger transmits same data to Computer for Data Acquisition.  

The data acquisition software provides online graphical representation of measured parameters on  computer screen. Test results & graphs are automatically generated by software at end of experiment. The  software provides facility of storage of readings & graphs in Windows based file formats.

Brief List of Experiments:
To study and compare the heat exchanged in shell and tube type and concentric type heat exchanger &  other heat exchangers*  
Determination of mean temperature difference under parallel and counter flow  
Determination of overall heat transfer coefficient.  
To determine the heat exchanger capacity.  
    * Only if more than one heat exchanger is ordered.  

Technical Specifications
Base service unit:  
Stainless steel tank (30 l), equipped with:  
    Electric heating element (3000 W) with thermostat (70 ºC), to heat the water, computer controlled.  
Temperature sensor (“J” type) to measure the water temperature.  
Level switch to control the water level in the tank.  
Stainless steel cover to avoid the contact with hot water. 
    The cover should have a hole that allows to  visualize the water level and also to stuff the tank.  
    Draining water valve.  
    Centrifugal pump with speed control from computer, range: 0 – 3 l/min.  
Two flow sensors, one for hot water and the other for cold water, range: 0.25 – 6.5 l/min.  
Control valves for the cold and hot water.  
Four ball valves that, depending on how manipulated, could give co-current or counter-current flux in  the exchanger.
    Two ball valves to control and drain the hot water of the base unit.  
    Pressure regulator to avoid the introduction of too much pressure in the exchangers, tared at 0.6 bar.  
    Four flexible tubes to connect with the different exchangers.  

(A) Concentric Tube Heat Exchanger  
Exchange length: L = 2 x 0.5 = 1 m.  
Internal tube:  
Internal diameter: Dint = 16 • 10-³ m.  
External diameter: Dext = 18 • 10-³ m.  
Thickness = 10-³ m.  
Heat transfer internal area: Ah = 0.0503 m².  
Heat transfer external area: Ac = 0.0565 m².  
External tube:  
Internal diameter: Dint = 26 • 10-³ m.  
External diameter: Dext = 28 • 10-³ m.  
Thickness = 10-³ m.  
Six temperature sensors (“J” type)  
Extended Concentric Tube Heat Exchanger:  
Exchange length: L=4x1=4 m.  
Internal tube:  
Internal diameter: Dint = 16 • 10-3 m.  
External diameter: Dext = 18 • 10-3 m.  
Thickness = 10-3 m.  
Heat transfer internal area: Ah = 0.0503 m².  
Heat transfer external area: Ac = 0.0565 m².  
External tube:  
Internal diameter: Dint = 26 • 10-3 m.  
External diameter: Dext = 28 • 10-3 m.  
Thickness = 10-3 m.  
Ten temperature sensors (”J” type)  

(B) Plate Heat Exchanger  
Maximum flow: 12m³/h.  
Maximum work pressure: 10 bar.  
Maximum work temperature: 100 °C.  
Minimum work temperature: 0 °C.  
Maximum number of plates: 20.  
Internal circuit capacity: 0.176 l.  
External circuit capacity: 0.22 l.  
Area: 0.32 m².  
Four temperature sensors (“J” type)  
Extended Plate Heat Exchanger  
Maximum flow: 12 m³/h.  
Maximum work pressure: 10 bar.  
Maximum work temperature: 100 °C.  
Minimum work temperature: 0 °C.  
Maximum number of plates: 20.  
Internal circuit capacity: 0.176 l.  
External circuit capacity: 0.22 l.  
Area: 0.32 m².  
Ten temperature sensors (”J” type)

(C) Shell & Tube Heat Exchanger  
    Four segmented baffles located transversely in the shell.  
Exchange length of the shell and each tube: L = 0.5 m.  Internal tube (21 tubes):  
Internal diameter: Dint= 8 • 10-³ m.  
External diameter: Dext = 10 • 10-3 m.  
Thickness = 10-3 m.  
Internal heat transfer area: Ah= 0.0126 m².  
External heat transfer area: Ac= 0.0157m².  
Shell:  
Internal diameter: Dint,c= 0.148 m.  
External diameter: Dext,c= 0.160 m.  
Thickness = 6 • 10-3 m. 
Seven temperature sensors (“J” type), for measuring cold and hot water temperatures at different  points of the  exchanger. 

(D) Jacketed Vessel Heat Exchanger
Anodized aluminum frame and panels made of painted steel.  
Main metallic elements made of stainless steel.  
Diagram in the front panel with distribution of the elements similar to the real one.  
Constituted of a vessel.  
Vessel total volume: 14 l.  
Interior vessel volume: 7 l approx.  
Jacket volume: 7 l approx.  
Overflow or a pipe allows the exit of the water in the vessel through its upper part to maintain a  constant flow during the process with a continuous supply.  
Jacket surrounds the vessel through where hot water flows.  
Electric stirrer.  
Five temperature sensors (“J” type) 

(E) Coil Vessel Heat Exchanger
Anodized aluminum frame and panels made of painted steel.  
Main metallic elements made of stainless steel.  
Diagram in the front panel with distribution of the elements similar to the real one.  
Formed by a pvc-glass vessel, volume: 14 l.  
Overflow or pvc-glass tube lets the output of water from the vessel in the upper part in order to  maintain the flow constant for continue supply process.  
Copper coil where the water circulates:  
Dint= 4.35 mm.  
Dext= 6.35 mm.  
Total length of the tube that forms the coil: 1.5 m.  
Electric stirrer.  
Five temperature sensors (“J” type) 

(F) Turbulent Flow Heat Exchanger
With Anodized aluminum frame and panels made of painted steel.  
With Main metallic elements made of stainless steel.  
Diagram in the front panel with distribution of the elements similar to the real one.  
Formed by two copper concentric tubes with hot water circulating through the internal tube and cold  water circulating through the annular space.  
The exchanger should have 4 equal sections of 500 mm each one, where the heat transfer takes  place.  
Exchange length: L = 4 x 0.5 = 2 m.  
Internal tube:  
Internal diameter: Dint = 8 • 10-3 m.  
External diameter: Dext= 10 • 10-3 m.  
Thickness = 10-3 m.  
Internal heat transfer area: Ah= 0.0377 m².  
External heat transfer area: Ac= 0.0471 m².  
External tube:  
Internal diameter: Dint,c =13 • 10-3 m.  
External diameter: Dext,c = 15 • 10-3 m.  
Thickness = 10-3 m.  
Twelve temperature sensors: (“J” type)  

(G) Cross Flow Heat Exchanger
Anodized aluminum frame and panels made of painted steel.  
Main metallic elements made of stainless steel.  
Diagram in the front panel with distribution of the elements similar to the real one.  
Poly methyl methacrylate (PMMA) rectangular duct of 800 x 200 x 200 mm.  
Radiator located across the air duct.  
The fins of the radiator should made of aluminum and have a heat transfer area of 35000 mm².  
Axial fan with speed control from computer (PC). 
It should provide a maximum air velocity of 3 m/s.  
Four “J” type temperature sensors to measure input and output water and air temperatures.  
Velocity sensor to measure air velocity, range: 0 – 4 m/s.  
Two ball valves.
Computerised data acquisition, plotting on-line, generating calculations using formulas to  determine performances & control software for heat transfer. 
A comprehensive HELP menu  makes the system user friendly.  
Note: Personal Computer required not in scope of supply unless specifically ordered. 

Optional Additions
Glass/Acrylic Tube Heat Exchangers  
Note: Details of attachments can be made available on request.

Instruction Manual
Self -explanatory a) Installation Manuals; b) Teaching & Experiment Manuals & c) Operating manuals are  provided with each system. Detailed theory as well as practical exercises are included in the manual  

Services Required
Water supply and drainage arrangement  
Electric supply