When looking at the design of an AEL LTHW Central Heating (CH) Plate Heat Exchanger for a Hotel , Hospital , Residential property etc the core principle of the design tends to be the same (or very similar) with the Primary hot water circuit from a Boiler or another Primary heat source having a Flow and Return temperatures of 80 oC returning at 60 oC which in turn heats the LTHW system side Central Heating circuit from 57 oC to 77 oC.
The Primary Hot and the Secondary Cool circuits cannot have identical temperatures but a 3 degree differential is quite acceptable to design an Alfa Laval LTHW Plate Heat Exchanger.
If the system design duties are not available from site in the early stages of an enquiry, then assuming the Primary Flow and Return Temperatures are 80 >60 oC and the Secondary Temperatures are 57> 77 oC is a good starting point for Quotation purposes, these can be changed later if required.
AEL LTHW Central Heating (CH) Plate Heat Exchangers can be supplied on a skid with a Techno System Control Panel c/w Valves and Primary Pump etc or as an Alfa Laval Plate and Gasket Plate Heat Exchanger or as an Alfa Laval Brazed Plate Heat Exchanger unit controlled elsewhere via a BMS System.
In practice the both types of LTHW Central Heating (CH) Plate Heat Exchanger tend to follow the same principle of the Hot Primary Circuit heating the Cooler Secondary circuit to as close to the Primary Hot Water Temperatures as possible.