Example: waste heat

Waste heat is basically a "free" energy source used by a growing number of companies. ERK Tubes applications pay off very quickly in this field, thanks to the small heating surface.

Example: heavy duty heat exchangers

Heat exchangers with ERK Tubes technology to produce hot water following oven firing, used in the food industry

max. output

1550 KW

year of manufacture



stainless steel

natural gas equivalent per year

ca. 13 GWh thermal

payback period of the entire facility

< 2 years

distinctive features

compact design,
little pressure loss, high efficiency factor

Example: problem fuels

Air preheaters with ERK Tubes technology to preheat the combustion air following pulverised brown coal firing in operated with oxy-fuel; Additionally, a 400kW hot water boiler with economiser and a water-water exchanger were supplied.


40 KW

year of manufacture



stainless steel

distinctive features

compact design,
very good anti fouling performance

Example: compact thermal post-combustion

Compact thermal post-combustion is an innovative enhancement of conventional themal post-combustors. Advantages: low operating costs, little required space and easy handling; The supplied ERK Tubes serve to preheat exhaust air.

     The heat transfer, significantly increased by ERK Tubes technology, made it possible for Eisenmann AG to to give the combustion chamber and the downstream heat exchangers a completely new design and setup. Thus, the space the facility required could be reduced considerably.

Example: seawater cooler for submarines

In shipping, the space and weight reduction play an important role, as well as the anti-fouling effect of ERK Tubes. The weight and space-saving can be utilised to increase the cargo weight and volume.

     Since it was impossible to make a new design due to the strict criteria and the small size-ratio, an unchanged output at the same overall size was ensured thanks to the more efficient ERK Tubes heat exchanger tubes. Due to the diving depth the tube bundle was subjected to a pressure test at 80 bar.

Table 1:
test results pressure loss
Table 2:
test results heat transfer

The pressure loss increased exponentially, however it was only 17 % higher than with smooth-bore tubes at a maximum volume flow of 37 m³/h. the heat transfer coefficient of the ip tube application was about 20 % higher than with smooth-bore tubes.

Red: smooth-bore tubes
Dark blue: ERK Tubes