Feature consideration in unit performance is the air distribution in a room which is closely linked to fan selection and coil placement .
Other experiences related to design mistakes start with the “ actual ” versus the “ designed ” parameters where this mostly results in an over specified system because of high margins added at a feed stage . This includes provision for future expansions . If suppliers have all the information up front , they can size the HEX very accurately with the product of less problems .
Another major design error is the flaw of assuming fluids have the same properties or will act like water . A simple example is a brine solution , although this may look similar to water , its thermal properties are vastly different . It is important to provide information on the fluids to ensure that the correct physical properties are used and compatible material is selected .
and innovative new features and technical concepts that have not been seen before are being released .
These solutions are now available in the world ’ s most modern gasket plate heat exchangers and the smallest of design change has significant results . This could be improvements as an increased thermal surface area which can boost efficiency across the whole plate pack . In some cases , it
TRENDS AND NEW TECHNOLOGY Product footprint continues to be a significant factor as allocated plant room space is just far smaller than what was seen in previous eras owing to the nature of facility aesthetics , but also general building and specialist costs associated with projects . Designers therefore are able to specify several ranges of products to maximise space utilisation on sites . These could be in the form of dedicated containerised plant rooms or outdoor racks with the addition of integrated condensers which provide clients flexibility and cost benefits against the rising building costs traditionally relied on . System refrigerant charge is another notable trend that design teams have focused on while taking a wider view , trends have moved towards customers requiring more end-to-end solutions that minimise points of responsibility and localise all project elements . This approach means that each individual design decision and implementation is made with cognisance of its impact on the whole project , and therefore the best overall outcomes can be achieved while limiting expenses and errors .
HC Heat Exchangers
A blower coil installed at a cold storage facility .
" Certain specialist suppliers are also setting new standards for thermal efficiency with their products ."
As can be expected , certain HEX types have grown in popular in a variety of applications due to the potentially lower purchasing cost or their performance above other solutions . These products , such as plate heat exchangers , have new features that ensure higher heat transfer efficiency , better reliability and greater serviceability .
Certain specialist suppliers are also setting new standards for thermal efficiency with their products , raising the bar when it comes to producing reliable , serviceable and energy efficient HEX technology for their customers . This means that results are bold
© RACA Journal | Benjamin Brits
The heat exchangers used a CO2 system with gas cooler . CO2 systems operate differently to regular refrigerant systems .
www . refrigerationandaircon . co . za RACA Journal I January 2023 33