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HEAT TRANSFER FEATURE THE IMPORTANCE OF PRODUCT ANALYSIS IN PROCUREMENT


Matt Hale, international sales & marketing director, HRS Heat Exchangers, explains the importance of assessing product properties in order to achieve optimal heat exchanger performance


I


n any process situation, the combination of products and service fluids,


application, temperature and other variables will be different. Understanding these properties enables project engineers to feed back the most relevant information to the manufacturer and ensure the correct heat exchanger is supplied. The key aspects of product analysis are


studying viscosity and flow behaviours, the study of which is known as rheology. Some of the key measurements that should be taken include: • Viscosity • Density • Shear behaviour • Thermal behaviour It is also recommended that the


following measurements of different parameters are taken to model the product’s behaviour and calculate key parameters: • Apparent viscosity • Heat transfer coefficient • Flow type at different conditions • Yield stress The basic type of material will also be a


key consideration – for example, whether the product is a gel, liquid, emulsion, suspension or other. HRS uses specialist laboratories to perform a range of tests, the exact nature of which depends on the product being tested and the potential forces and stresses that it will be subjected to during normal processing. It is also important to determine key


thermal limits for many food products. These include: • Protein denature temperature: The


temperature at which proteins in the product are denatured can be useful in processes like liquid egg pasteurisation, where the wrong temperature can result in scrambled, rather than liquid, eggs. • Starch activation temperature: Above


this, product viscosity increases rapidly. • Maillard reaction: In many products,


such as smoothies, a fresh, non-processed taste is important: understanding the temperature at which the Maillard reaction occurs means you can ensure that an apple-based smoothie tastes like fresh apples, rather than toffee apples. For some food products, additional


organoleptic testing may be required to ensure that processing the product has had the desired effect without any impact on quality. Once key parameters such as the viscosity and Non-Newtonian shear thinning factors are known, they can be used to select the best type of heat exchanger – for example, corrugated tubes will deliver heat transfer benefits in products which have a Reynolds number above 2,000 and which display transition or turbulent flow characteristics. These measurements also allow designers to use heat exchanger software to calculate additional information which is required for the design, but which cannot be directly measured in the laboratory. Some of these values include the heat transfer


SUSTAINABLE HEATING AND HOT WATER SYSTEM FOR ECO RESORT


As the eagerly-awaited opening approaches of the luxury Tyram Lakes eco resort, which incorporates 325 eco lodges and a 104-bedroom hotel over 165-acres, Geyser Thermal Energy have confirmed that its holistic design will utilise 90% less energy than fossil fuel systems – without sacrificing any comfort at all. During the summer, the system will use 100% less energy, making the Tyram Lakes resort completely carbon neutral during the high season. Alexander Pearce, CEO of the developers, Rothgen, said:


“This isn’t just some tick-box environmental marketing exercise with a few solar panels and some recycling; our strategic partner Geyser Thermal Energy’s expertise in harnessing precious resources is the silent yet crucial heartbeat of this very exciting prestigious development. “What makes it so genuinely ‘eco friendly and sustainable’ is that despite its size making a significant


demand for water, heating and cooling, resources here will be recovered and re-used on an unprecedented scale. Even the natural body heat from our guests will be recovered and re-used to heat water for showers.” He added: “We are also ensuring, for example, that in reducing demand and protecting the local


environment, Tyram Lakes’ innovative water treatment systems will save over 10 million litres of water per year.” Geyser Thermal Energy


www.geyserenergy.co.uk


HRS employs design and modelling software which uses computational fluid dynamics (CFD) to predict and study the flow of the product through the heat exchanger


coefficient, the flow type and the Reynolds number (the ratio between the fluid’s dynamic forces and viscous drag forces).


HRS Heat Exchangers www.hrs-heatexchangers.com


CONNECTED CONTROLLERS


nVent Electric has announced the launch of nVent’s RAYCHEM Elexant 4010i, the first smart, connected controller from the Elexant family. Designed to provide a safe, reliable and flexible control solution for industrial applications, the Elexant 4010i is said to make the control and maintenance of heat tracing technology smarter, safer and more cost-effective. In hazardous environments, the


Elexant 4010i replaces previous single- circuit 910 controllers; providing insights into system status and eliminating manual maintenance checks associated with all types of heat tracing apparatus. The Elexant 4010i’s has approval for use in industrial applications worldwide, so offers a controller solution that is compliant anywhere. In addition, the new controller protects people, buildings and equipment with smart limiter and intrinsically safe (IS) barrier options, and self-testing features. The controller can be integrated


alongside any process control network to bring direct, comprehensive reports from the field or electrical room straight to the maintenance engineer’s desk. This flexible connectivity combined with easy design and installation reduces field commissioning time. Ready for Industry 4.0, the


controllers come equipped with multiple communication options (Modbus, Profibus, Ethernet) for easy integration with existing process control systems. The intuitive touch screen User Interface (UI) makes it quick and easy to monitor multiple data points, both locally and centrally - all in one streamlined dashboard. www.nventthermal.com


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PROCESS & CONTROL | JULY/AUGUST 2019 29


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