Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10156219 | Energy | 2018 | 49 Pages |
Abstract
A new cycle combining a heat pump-transformer and a turbine is proposed to simultaneously produce electric power and useful heat. The system was modeled using the ammonia-lithium nitrate mixture. Plots of power, useful heat, energy and exergy efficiencies are shown against the main system operating temperatures. The heat supplied to the system at a relatively low temperature was upgraded by 40â¯K to a higher useful level, whilst the proposed cycle was able to produce up to 300â¯kW of electric power at the same time depending on the operating system temperatures. The modeling showed that the overall energy and exergy efficiencies can reach values of up to 61% and 92%, respectively. Comparing the proposed system with an organic Rankine power cycle and an absorption heat transformer operating separately under the same operating conditions reductions in energy use and irreversibilities of up to 32.3% and 21.6%, respectively, could be achieved. In addition, a case study of the integration of the proposed cycle into a cogeneration pulp and paper mill is presented and it is shown that up to 25% of the gas natural supplied to the boilers could be saved together with 210â¯kW electric power production.
Related Topics
Physical Sciences and Engineering
Energy
Energy (General)
Authors
J.A. Hernández-Magallanes, C.L. Heard, R. Best, W. Rivera,