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Heat Exchanger with Steeply Curved Coils


Experimental Studies of "Gas-Water" Heat Exchangers with Heat Exchange Surface of Steeply Curved Self-Spacer Coils

Tech Area / Field

  • NNE-HCS/Heating and Cooling Systems/Non-Nuclear Energy

3 Approved without Funding

Registration date

Leading Institute
Experimental Designing Bureau of Machine Building (OKBM), Russia, N. Novgorod reg., N. Novgorod


  • General Atomics, USA, CA, San Diego

Project summary

The project objectives are:

1. Development of preliminary design of modular “gas-water” heat exchanger with heat exchange surface of steeply curved (with small bending radius) self-spacer coils.

2. Manufacture of a representative model of “gas-water” heat exchanger from steeply curved (with small bending radius) self-spacer coils and its experimental studies at the gas test facility.

Results of the work allows justification to use technical decisions proposed in the project for “gas-water” heat exchangers and assessment of effectiveness of their use in comparison with other types of heat exchangers, such as ones with longitudinally and transversely finned tubes, etc. Besides, the following will be determined after testing the heat exchanger model:

- thermal and engineering characteristics of the heat exchanger model;
- hydraulic characteristics of the heat exchanger model for gas circuit and cooling water circuit.

The obtained characteristics will allow validation or refinement of analytical characteristics and correction of computer codes for analysis of heat exchange surfaces from steeply curved (with small bending radius) self-spacer coils for “gas-water” heat exchangers. This will allow extending the use of such heat exchange surfaces in power engineering.

Power and chemical engineering, as a rule, uses heat exchange surfaces from coils made with bending radius equaled to 3.5 and more external diameters of tube. Coils made with bending radius less than the indicated value it is accepted to consider as coils with small bending radius (CSBR).

Heat exchangers made of CSBR are widely applied both in Russia and abroad and, as a rule, used for "water – water" and "gas – gas" heat exchangers.

Such heat exchangers are characterized by the following features:

- typical smooth tubes mastered by industry and produced serially are used to manufacture these coils;
- winding of coils is not difficult, it may be easily and with minimal expenses mastered at their serial production;
- heat exchange surface of coils working in parallel has great self-compensation ability at temperature expansions and under vibration conditions.

OKBM has practical experience on development, manufacture and tests of “water – water” heat exchangers of CSBRs.


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