Publications

- Not considering alternative sources of flexibility can lead to significant errors. - Unit commitment constraints have limited impact with alternative flexibility sources. - Unit commitment constraints mainly impact investments in storage technologies. - Sensitivity to assumed flexibility of power plants and reserve requirements is high. - Errors due to approximate formulations are small compared to the sensitivities.

In this paper, a two-step design optimization framework is developed for four low-temperature geothermal combined heat-and-power plant configurations. The economic comparison, including off-design performance, has not been done before. The optimization tool is applied for an existing district heating system and for geothermal and meteorological conditions which are based on the Belgian situation. It is concluded that a combined heat-and-power ...

Deep-geothermal energy is readily available all over the world as long as one is willing to drill deep enough. However, in northwest European countries, the geothermal gradient is low (~30 °C/km) which leads to high drilling costs and low geothermal source temperatures (110-150 °C). As a result, the stand-alone electrical power generation from a low-temperature geothermal energy source is not economically viable without some kind of support ...

In this paper, we propose a thermoeconomic optimization procedure for four configurations of low-temperature geothermal combined heat-and-power (CHP) plants. The series, parallel, preheat-parallel and HB4 configurations are investigated. Electricity is produced via an organic Rankine cycle (ORC) and two types of district heating (DH) systems are considered for the heat delivery: a 90/60 and a 65/40 DH system. The objective is to maximize the net ...

In this paper, a two-step optimization methodology for the design and off-design optimization of low-temperature (110-150°C) geothermal organic Rankine cycles (ORCs) is proposed. For the investigated conditions-which are based on the Belgian situation-we have found that the optimal ORC design is obtained for design parameter values for the environment temperature and for the electricity price which are both higher than the respective ...

In this paper, several cost metrics for application to a combined heat-and-power plant fueled by a zero-marginal cost energy source are studied. The mature levelized cost concepts are extended with some novel metrics such as the levelized cost of exergy. The results are given for a geothermal combined heat-and-power plant, connected to two different types of district heating systems and for two scenarios for the heat and electricity prices (high ...

© 2018 Elsevier Ltd Deep-geothermal energy is a renewable energy source which provides a constant heat flux to the earth surface. If this heat is used properly, the geothermal power plant might serve as a base-load plant. However, geothermal well drilling costs are high, so the economic feasibility is not always secured. This is especially the case for low brine temperatures, which are common in NW Europe. In this paper, we will investigate the ...

This work compares the performance of four combined heat-and-power (CHP) configurations for application in a binary geothermal plant connected to a low-temperature 65/40 and a high-temperature 90/60 district heating system. The investigated configurations are the series, the parallel, the preheat-parallel and the HB4 configurations. The geothermal source conditions have been defined based on existing geothermal plants in the northwest of Europe. ...