FANDIS THERMOELECTRIC
FANDIS THERMOELECTRIC
 
 

 


Thermoelectric units

1 - What is a thermoelectric unit?

2 - How does the thermoelectric unit work?

3 - When is the thermoelectric unit needed?

4 - What are the advantages of the thermoelectric unit compared to a compressor system?

5 - What are the major components of the thermoelectric unit?

6 - How much heat can be transferred with the thermoelectric unit?

7 - Can the thermoelectric unit reduce the temperature below that of the environment?

8 - How accurately can the thermoelectric unit control the temperature?

9 - Can the thermoelectric unit also be used for heating purposes?

10 - What do we mean by the Coefficient of Performance (or COP) of the thermoelectric unit?

11 - How do we install the thermoelectric unit?

12 - Must the thermoelectric unit be installed in a certain position?

13 - What is the lifetime of the thermoelectric unit?

14 - Is the thermoelectric unit reliable?

15 - How much space does the thermoelectric unit occupy?

16 - How much does the thermoelectric unit cost?

 

 

1 - What is a thermoelectric unit? 
A thermoelectric unit is a device for the transfer of heat.
The thermoelectric unit is a device designed for easy mounting which cools using only electrical energy. 
It achieves the same results as a traditional compressor system, without using gas or moving parts (except fans, if used).

 

2 - How does the thermoelectric unit work? 
The thermoelectric unit uses the so-called "Peltier" effect. the heat is transferred as a result of the flow of current through the thermoelectric modules. One side of the modules absorbs heat and as a consequence reduces the temperature (cold side), the other side dissipates the heat in the surrounding environment (warm side).

 

3 - When is the thermoelectric unit needed? 
The thermoelectric unit is needed when there is the requirement to control the temperature of a specific object which can be solid, liquid or gaseous.

 

4 - What are the advantages of the thermoelectric unit compared to a compressor system? 
The thermoelectric unit does not feature any moving mechanical parts (except fans, if used) and is therefore extremely reliable, enjoying an almost unlimited life span and does not require maintenance. Its "static" construction makes the thermoelectric unit immune to vibrations thus allowing its use in any position, for this reason it is particularly suitable for applications where mounting is required on moving systems. 
The thermoelectric unit does not contain any polluting substances such as CFC or other gases which may harm the ambient, has a more compact and simple structure than a compressor system, and can be easily customised and mounted. 

 

5 - What are the major components of the thermoelectric unit? 
The heart of the system consists of one or more thermoelectric modules. The cold side of the module is connected to a heat exchanger which helps the heat absorption from the object to be cooled. The warm side is connected to a heat sink which helps to transfer the absorbed heat to the surrounding environment.

 

6 - How much heat can be transferred with the thermoelectric unit? 
Each thermoelectric unit is designed to transfer a specific quantity of heat within a specific time. The nominal cooling power is usually referred to whilst in a situation of equilibrium (
DT=0). 
Compared to a compressor system, the cost/performance ratio usually remains competitive for cooling capacities up to a maximum of 200 W. This is currently a limitation of this technology, however continuous research efforts might increase this value and so make this cooling system suitable also when greater cooling power is required.

 

7 - Can the thermoelectric unit reduce the temperature below that of the environment? 
Certainly, but we must not forget that the cooling capacity decreases as the temperature difference between the object to be cooled and the environment increases. We must also remember that, unless a suitable thermal insulation is provided, the object we want to cool will tend to absorb heat from the external environment.

 

8 - How accurately can the thermoelectric unit control the temperature? 
This depends on the type of control and regulation used and at which position the temperature is measured. In optimum conditions a tolerance of ±0,5 °C can be obtained.

9 - Can the thermoelectric unit also be used for heating purposes? 
By changing the direction of the electrical current crossing the thermoelectric elements in the thermoelectric unit, the process itself is reversed and the heat moves in the opposite direction. To calculate the heating power we must also take into account the heat generated by the Joule effect.

 

10 - What do we mean by the Coefficient of Performance (or COP) of the thermoelectric unit? 
The COP is the relationship between the cooling power obtained and the electrical power absorbed. Depending on the type of application, the COP value has to be taken into consideration. If the main aim is to limit the input current absorbed then we require a COP value of close to or higher than 1. If, on the other hand, the aim is to reduce the cost of the thermoelectric unit and higher input current is acceptable, then in this case the COP value may fall below 1. The first solution is suitable in those cases where the input current is supplied by a source with limited capacity (such as a battery). The second solution is more suitable when the current is supplied by the mains power.

 

11 - How do we install the thermoelectric unit? 
The thermoelectric unit is a ready-to-be-integrated unit and can therefore be quickly and easily installed into the respective machine using only a few screws and, if necessary, silicon grease. Then it must simply be connected to a suitable power supply which, according to the customer requirements, may or may not be equipped with a control function.

 

12 - Must the thermoelectric unit be installed in a certain position? 
No. The thermoelectric unit can be installed in any position. Even the force of gravity doesn‘t represent an obstacle. What is important however, is that the dissipation of the heat is not impeded in any way.

 

13 - What is the lifetime of the thermoelectric unit? 
If the unit is equipped with a fan, then a first intervention of the thermoelectric unit may be required to substitute the fan when the bearings have been consumed. Otherwise, if the thermoelectric unit is operating in an ambient temperature of less than 50°C then the lifetime of the unit is practically unlimited. 

 

14 - Is the thermoelectric unit reliable? 
We assure you that during the production process each unit is subject to complete and accurate tests.

 

15 - How much space does the thermoelectric unit occupy? 
The unit is extremely compact and occupies less space than a traditional compressor system

 

16 - How much does the thermoelectric unit cost? 
The cost depends on many factors. cooling power required, COP required, dimensional limitations etc.

 

 

 

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