Absorption heat pump


(Thermal) absorption heat pumps can be used for:

  • Heat recovery through flue gas condensation
  • Industrial waste heat utilization

Absorption heat pumps can increase the efficiency and economy of industry, waste combustion and heating (power) plants when waste heat flows at low and high temperature levels are available. In particular for feeding in to district heating grids close by.


Information about heat recovery through flue gas:

For using the condensation heat of 45°C for district heating, a thermal driven absorption heat pump is needed. Thereby the district heating temperature of the return flow can be raised to 75-85°C. If higher temperatures for feeding in to the district heating flow are needed the existing boiler can raise the temperature to the desired level.
As shown in the example below, additional energy of 8 MWth can be won, which would otherwise escape through the chimney.


2017 02 16 Rauchgaskondensation

Basically sensitive heat (through economizer) and latent (condensation-) heat can be extracted from flue gas. The condensation heat leads to much higher performances, but only at a temperature level of about 45°C. With the Absorption heat pump, the heat at 45°C can be utilized for district heating grids when return flow is above 60°C. As driving energy at the high temperature side (>130°), heat of the boiler, which is produced anyway, can be used and therefore won’t be lost. For example, at biomass combustion process the heating performance of the boiler can be increased by more than 15 % of latent and ~ 5% of sensitive heat recovery - depending of temperature level, lambda value of combustion and fuel characteristics.


Through high energy recovery, usually very good economic efficiency can be reached.


Experiences in the field of absorption heat pumps and absorption cooling machines:
Since 2002 SOLID has been gaining practical experience with thermal absorption machines with capacities up to 23 MW. Heat pumps as well as cooling machines.
Services to offer:

  • Specification
  • Procurement
  • Installation
  • Commissioning
  • Operation
  • Optimization
  • Maintenance