**7. Conclusions**


and methodology for optimal design can be used for optimal selection of WPHE plates and flow arrangement for specified process conditions in different ammonia synthesis columns, as well as for optimisation of the whole ammonia production unit. It opens the prospect for further research in applications of WPHE for ammonia condensing columns and processes like a synthesis of methanol and others operating in high-pressure and -temperature conditions.

**Author Contributions:** Conceptualisation, L.T., P.K. and J.J.K.; methodology, P.K., J.J.K. and O.A.; software, P.K. and O.A.; validation, O.P., P.A. and L.T.; formal analysis, O.A.; investigation, O.P. and P.A.; resources, L.T.; data curation, P.A.; writing—original draft preparation, P.K.; J.J.K. project administration, writing—review and editing, P.K. and J.J.K.; supervision, L.T.; project administration, L.T. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** This research has been supported by the EU project "Sustainable Process Integration Laboratory—SPIL", project No. CZ.02.1.01/0.0/0.0/15\_003/0000456 funded by EU "CZ Operational Programme Research, Development and Education", Priority 1: Strengthening capacity for quality research in a collaboration agreement with National Technical University "Kharkiv Polytechnic Institute".

**Conflicts of Interest:** The authors declare no conflict of interest.
