Cover Story :
10 One easy choice : Ohmstede ’ s capabilities for the heat transfer industry
Ohmstede has maintained its position as one of the most trusted names in American manufacturing for over a century . Since its foundation in 1905 , Ohmstede has set the benchmark in the industry for all things shell and tube heat exchangers .
18 HVAC Duct Cleaning by Robot
HVAC ducts are used to convey air within buildings and can become unclean and unsanitary over time , requiring the services of a specialist team or company to rectify . Ductwork can be complex in size , shape and direction , and the most optimal way to clean ducts is the use of a high-tech robot
23 tHERMAl management in green hydrogen production : Design considerations
Central cooling systems for largescale green hydrogen production can be based on wet or dry cooling . Alternatively , hybrid solutions are available as well . This article discusses three such solutions and considers the factors influencing the selection of cooling technology .
28 Spiral tube heat exchangers : High efficiency and robustness
Spiral tube heat exchangers ( STHE ) have been used for many years . In fact , they have been used since the beginning of the cryogenic liquefaction industry in the early nineties . They were developed by Linde under the industrial name of coilwound heat exchangers ( CWHE ) and were used for the first time on an industrial unit of liquified air in 1895 .
31 Formable duplex stainless steels for plate heat exchangers
This article elaborates on the opportunity of using less ductile duplex stainless steel alloys as a cost-effective alternative to high-alloy austenitic grades in welded plate heat exchangers .
36 How much engineer does software need ? Calculation of shell-and-tube heat exchangers
Unconditional trust in a calculation left to “ others ” should not lead to uncritical acceptance of the results .
38 uNDERStanding the value of arc flash management and mitigation for large electric process heaters
While larger medium voltage process heaters are relatively new in hydrocarbon processing , the safety issues surrounding medium-voltage equipment are well known . Arc flash events are a prime example of a rare but potentially deadly situation that can be mitigated with the right technology .
43 Welcome back ! Stainless Steel World Conference & Expo 2022
At the end of September , the European stainless steel industry finally reunited after several years of postponements and delays , and what a celebration it was .
Decrease K in % of K0
Acceptance of the WDZ with fouling
Total fouling resistance
4 Heat Exchanger World November 2022