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Evaluation of a transient borehole heat exchanger model in dynamic simulation of a ground source heat pump system
, Article Energy ; Volume 147 , March , 2018 , Pages 81-93 ; 03605442 (ISSN) ; Abbaspour, M ; Saidi, M. H ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
The performance of a vertical ground source heat pump system (GSHPS) largely depends on the fluid temperature leaving the borehole heat exchanger (BHE) that may be affected by the short-term behavior of the BHE. Although considerable research has been carried out to analyze the short-term transient response of the BHEs, few studies have investigated its impact on dynamic simulation of GSHPS. Therefore, this paper presents a numerical approach based on a transient BHE model to evaluate the performance of a residential GSHPS over short and long timescales. The numerical results are compared with the results of EnergyPlus software. It is shown that the proposed model can appropriately predict...
Plant-wide control of an integrated molten carbonate fuel cell plant
, Article Journal of Electrochemical Energy Conversion and Storage ; Volume 15, Issue 2 , 21 February , 2018 ; 23816872 (ISSN) ; Pishvaie, M. R ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2018
Abstract
This paper presents the design and part-load operation of a molten carbonate-micro gas turbine (MCFC/MGT) hybrid system (HS), and proposes a multiloop control strategy for the HS. A mathematical model of the system is introduced. Then, the structure of process is changed and the performance of HSs at part-load operation is studied. The novelty includes utilizing some part of the main fuel instead of auxiliary fuel in the combustion stage. The results show that the new configuration has more efficiency (about 63%). In order to keep the operating system within safe limits, variables of the control system are determined. Those controlled variables are as follows: stack temperature, fuel...