Heat exchanger performance monitoring

The Valmet DNA Heat Exchanger Performance monitoring application calculates, stores and displays the main performance parameters that indicate condition and operation efficiency of heat exchangers, such as condenser, district heat exchangers, HP -preheaters and LP -preheaters.


The application includes calculation of the main performance parameters of the following heat exchangers:

  • Steam condenser
  • HP – and LP-preheaters
  • District heat exchangers

The calculated performance parameters include:

  • Effect [MW]
  • Heat transfer coefficient (for condenser) [W/°C]
  • Temperature efficiency (for heat exchangers) [ - ]
  • Terminal temperature difference [oC] or alternatively
  • Log mean temperature difference [oC]


  • The DNA Heat Exchanger Monitoring provides the power plant maintenance and operating personnel with a tool that helps to detect potential problems in heat exchangers operation and analyze the problems that have occurred. This contributes towards proactively responding to failures before they cause unpredicted shutdowns.
  • The extensive storage of history data also enables long- term monitoring of gradual component deterioration and mechanical failures and thus improve scheduling of maintenance.
  • The DNA Heat Exchanger Monitoring application is linked seamlessly to the overall automation applications, which guarantees efficient collaboration between plant management and plant control.

Performance monitoring and reporting

Valmet DNA monitoring and reporting solutions are designed to assist in all areas of power plant operation - from management to production and maintenance.