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Micro Delta T AB

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µΔT Heat Exchanger

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THe Best Refrigator Heat Exchanger Solution in the World

   

Demo

MDT® demonstration unit clearly demonstrates the superior performance of and the enhancement of the heat transfer of surfaces made by Micro Delta T . MDT-surface layer significantly improves the boiling heat transfer in evaporator and consequently the performance of heat pump as a whole.

The MDT® Demonstration unit is a conventional water-to-air heat pump, shown schematically in the Figure. The unit consists of two evaporators which are commercial heat exchangers (Alfa-Laval,M3) and MDT® Surface heat exchanger. The two evaporators are connected in parallel in the unit. A set of solenoid valves is used to connect either Evap 1 or Evap 2 during the operation of the unit, which allows the comparison of the performance of heat exchangers. Electrical heaters provide the heat to the heat source loop, marked blue circuit in Figure 1. The high pressure vapor leaving the compressor is condensed and sub-cooled in an air-cooled condenser.

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The heat transferred through an evaporator, QC, can be calculated by the Equation

 

QC=U.A.LMTD

 

where U is overall heat transfer coefficient; A is heat transfer surface area; and LMTD is logarithmic mean temperature difference between the refrigerant and brine.


The operation of the MDT® demonstration unit can be operated either  using Evap 1(MDT® surface heat exchanger) or Evap 2(ordinary surface heat exchanger). Since the test conditions are the same, The demon can effectively evaluate performance of heat exchanger with MDT® Surface while comparing with traditional surface plate..
The use of MDT® Surface significantly increases the UA-value. This enhancement can be observed as reduction of LMTD if QC kept constant.

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MDT® Surface