Flow Control, Flow Control February 2019

heat which can then be used for water space or process heating waste treatment or other thermal applications Factors to consider While some processes and materials require specific equipment such as ovens or retorts heat exchangers are an effective and efficient solution and are more likely to enable heat regeneration than other systems The choice of heat exchanger depends on many factors such as the nature of the process to be Newtonian and non Newtonian fluids will behave differently under different temperature and pressure regimes carried out pasteurization sterilization or dehydration the viscosity of the food or drink being processed and whether it contains particles or pieces Furthermore Newtonian and non Newtonian fluids will behave differently under different temperature and pressure regimes and this will affect the handling required during processing For example if subjected to too much pressure certain sauces may shear resulting in failure to meet the end specification such as pizza sauce not Left The HRS Unicus is ideal for difficult heat transfer applications with viscous fluids or with a high risk of fouling staying on the pizza Another challenge is presented by certain fat free products which become more or less viscous with temperature so there may be more fluid on the cooling side of the heat exchanger than the heating side Benefits of corrugation Such issues can be overcome by specifying the correct type of heat exchanger for the task in hand and by careful system design Corrugated tube heat exchangers are available in various configurations so delicate materials such as cream can be processed without damage The corrugated design also minimizes fouling in the heat exchanger which increases the thermal efficiency and prolongs operational periods between cleaning In addition corrugated tube heat exchangers have a lower pumping requirement than smooth tubular heat exchangers due to their compact nature which results in a lower pressure drop This helps increase operational life while reducing maintenance costs compared with other types of heat exchangers Reducing waste For some materials such as curd production in the dairy sector increased turbulence can be beneficial Alternatively www flowcontrolnetwork com February 2019 13