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Publication Title | Combined Heat and Power (CHP)

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Combined Heat and Power (CHP)

The objective of Combined Heat Power (CHP) is to generate electric power at locations where also a heat demand is present for either domestic or industrial heating. This way, CHP saves energy as the waste of heat losses by large electric power stations is avoided.

Exhaust Heat



EnerTwin 3kW micro-CHP system





High speed generator


Recuperated micro turbine in a CHP configuration

Micro gas turbines

The EnerTwin CHP system generates electric power using a 3kW micro turbine. Gas turbines are known for their high power to weight ratio and low maintenance costs. Using off-the-shelf turbocharger technology leads to low production costs. The turbomachinery components are optimized for the turbogenerator application.

Driving a high-speed generator at 240,000 rpm, the turbogen- erator has a net electric efficiency of 15% (19% shaft power effi- ciency). Together with the low costs, this offers great potential for cost effective micro-CHP systems. The generator is coupled to the micro turbine by a unique in-house developed compact rotor con- cept. Due to the recuperator, part load efficiency can be kept close to the design point maximum.


The recuperator is an advanced heat exchanger recovering exhaust heat into the gas turbine working cycle, saving almost 50% of fuel compared to a system without a recuperator and providing a sub- stantial increase in efficiency.

An efficient high-speed permanent magnet generator converts the mechanical power from the micro turbine into electric power. The generator is fully integrated in the micro turbine rotor system, avoiding costs and losses of additional bearings and couplings.

Heat exchanger

The efficient heat exchanger transfers heat from the micro turbine exhaust to the micro-CHP heating system circuits.

Operation profile

The EnerTwin has a rapid (< 2mins) start-up capability. Moreover, power can be modulated down to about 50% without significant loss of efficiency.

Monitoring and control

The EnerTwin micro-CHP system has an on-line control and moni- toring capability for remote operation and smart grid applications. This offers excellent installation and operation flexibility in cascade and other configurations.


Micro turbines emit only high frequency noise that can effectively be mitigated. Compared to alternative concepts, the EnerTwin has very low noise emissions.

Benefits for the environment

The EnerTwin micro-CHP system offers a substantial contribution to CO2 emission reduction. With MTT’s clean low-NOx combustor, other exhaust gas emissions levels are minimal.

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Image | Combined Heat and Power (CHP)

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