We present a summary of the conference speech of Mr. Primož Poredoš, Ph.D., that he had at the 21st International Conference on District Energy, organised in Portorož, Slovenia, from 18th – 20th March, by the Slovenian Energy Association SEA (formerly known as SDDE).
»The paper presents the experimental comparison of the thermal characteristics of the Plate-Tube (CP) and roll-bond (RB) evaporators. The comparison of their thermal characteristics was based on the measurement of the discharged heat flux from each type of evaporator.
A comparison of the results shows that in the entire temperature range of the transmission medium in the evaporator, the RB evaporator is more efficient than the CP evaporator. The difference is reduced by lowering the inlet temperature of the transmission medium, which can be attributed to the occurrence of white frost on the evaporator inside the refrigerating appliance.
It has been found that RB evaporator has a 15 to 70% higher cooling power compared to the CP evaporator at the temperature range under consideration. On average, in the RB evaporator the product of heat transfer and surface area, named kA is 47.3% higher than in the case of the CP evaporator. The higher cooling power of the RB evaporator is the result of its improved heat transfer between the transfer medium in the evaporator and the air in the refrigerator.
The dynamic performance of both types of evaporators (forced increase in the air velocity near the evaporator using a fan) has a positive effect. At both types of evaporators, the cooling power is increased by an average of 30% (in the case of RB evaporators up to 27%, in the case of CP up to 35%). Interestingly, in RB evaporators in static mode (without the use of a fan), slightly better results were achieved compared to CP evaporators in dynamic mode.«
You can read the full article on the website: SEA / SZE