The design of the HRSG in a cogeneration system depends on which of the following?

In a cogeneration system, the design of the Heat Recovery Steam Generator (HRSG) is heavily influenced by thermal and electrical requirements. This is because the primary purpose of an HRSG is to recover heat from the exhaust or flue gases of a gas turbine or other prime movers to generate steam. This steam can be used for various purposes, including driving a steam turbine for additional electricity generation or for process heating.

The thermal requirements involve assessing how much heat can be recovered and utilized effectively, which directly relates to the efficiency of the system and the operational needs of the processes that will use the generated steam. Electrical requirements come into play since cogeneration aims to produce both thermal energy and electricity. The design must ensure that the HRSG can meet the electrical output needed by assessing the steam pressure and temperature required to efficiently drive a steam turbine generator.

Therefore, thermal and electrical requirements are essential considerations that impact the design, layout, materials, and operational strategies of the HRSG to optimize performance in cogeneration applications. The focus on these aspects helps ensure that the system meets its intended operational goals efficiently.