Efficiency Diagram for District Heating System with Gas Condensing Unit

AbstractThe integration of a flue gas condensing unit in a district heating (DH) system source increases the efficiency of the DH system due to the partial recovery of flue gas heat. A multi-regression equation obtained linking the gas condensing unit efficiency indicator with several statistically significant independent variable parameters based on the statistical analysis of the DH system data in Ludza, Latvia, is discussed in this paper. Parameters related to the interaction between the gas condensing unit and the DH system, boiler capacity and the influence of the DH network return temperature on the efficiency of the gas condensing unit is discussed in more detail. To assess the efficiency of the gas condensing unit and to show the distribution of the boiler house heat load between the boiler and the gas condensing unit during the heating season, a diagram is proposed. As a result of the installation of a gas condensing unit after the boiler, the primary energy savings during the heating season is 11.8%

Necessary Amount of Spray Water for Optimal Flue Gas Condenser Operation

A calculation model was developed to determine optimal flue gas condenser operation modes in evaporation and condensation zones. One of optimization parameters that could be changed is amount of water to be spayed into flue gases. Optimal amount of spraying water was determined in various boiler operation modes

Analysis of Operation Mode for Complex DHS

The effectiveness of DHS operation depends on effectiveness of each element of the system separately, as well as on the interaction of all elements which can be evaluated by definite parameters of system operation. The results, which comprise some most essential parameters, reveal that the impact of the relative condenser capacity and relative heat losses is substantial on the total efficiency of the system. It is demonstrated that values of the gradient of a curve may be used to quantitatively assess impact of parameters. 

Efficiency Diagram for District Heating System with Gas Condensing Unit

The integration of a flue gas condensing unit in a district heating (DH) system source increases the efficiency of the DH system due to the partial recovery of flue gas heat. A multi-regression equation obtained linking the gas condensing unit efficiency indicator with several statistically significant independent variable parameters based on the statistical analysis of the DH system data in Ludza, Latvia, is discussed in this paper. Parameters related to the interaction between the gas condensing unit and the DH system, boiler capacity and the influence of the DH network return temperature on the efficiency of the gas condensing unit is discussed in more detail. To assess the efficiency of the gas condensing unit and to show the distribution of the boiler house heat load between the boiler and the gas condensing unit during the heating season, a diagram is proposed. As a result of the installation of a gas condensing unit after the boiler, the primary energy savings during the heating season is 11.8%

Analysis of Operation Mode for Complex DHS

The effectiveness of DHS operation depends on effectiveness of each element of the system separately, as well as on the interaction of all elements which can be evaluated by definite parameters of system operation. The results, which comprise some most essential parameters, reveal that the impact of the temperature of supply and return water does not differ on the total efficiency of the system. Special attention is paid to the losses in the heating network in cases with or without the flue gas condenser