Experimental investigation of domestic micro-CHP based on the gas boiler fitted with ORC module

Wajs, Jan; Mikielewicz, Dariusz; Bajor, Michał; Kneba, Zbigniew

doi:10.1515/aoter-2016-0021

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…First of all, the system effects of primary energy reduction connected with cogeneration should be investigated for the CHP plants that have been already internally optimized, e.g., by means of the coefficient of the share of cogeneration [21]. Secondly, the proposed within the paper methodology concerning heat losses during the transmission of heat can only be used for the centralized cogeneration systems, thus within the wide range of small-scale cogeneration solution (e.g., micro-CHP based on the gas boiler with ORC module [22]) the presented approach cannot be applied. Trigeneration realized in cooperation with absorption chiller is the second example in which system approach is needed for interpreting the useful effects.…”

Section: Discussionmentioning

confidence: 99%

System effects of primary energy reduction connected with operation of the CHP plants

Ziębik

Gładysz

2017

Archives of Thermodynamics

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The paper is devoted to explication of one of the advantages of heat and electricity cogeneration, rarely considered in technical literature. Usually attention is paid to the fact that heat losses of the heat distribution network are less severe in the case of cogeneration of heat in comparison with its separate production. But this conclusion is also true in other cases when the internal consumption of heat is significant. In this paper it has been proved in the case of two examples concerning trigeneration technology with an absorption chiller cooperating with a combined heat and power (CHP) plant and CHP plant integrated with amine post-combustion CO2 processing unit. In both considered cases it might be said that thanks to cogeneration we have to do with less severe consequences of significant demand of heat for internal purposes.

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Section: Discussionmentioning

confidence: 99%

System effects of primary energy reduction connected with operation of the CHP plants

Ziębik

Gładysz

2017

Archives of Thermodynamics

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“…A gear pump driven by a variable speed electric In the current application, R236fa was selected as the working fluid, so that a direct comparison would be possible with the experimental results from previous studies by the authors [9,45]. Moreover, R236fa shows a lower cost and similar thermophysical properties to R245fa, which is one of the most suitable working fluids for waste heat recovery in internal combustion engines [46,47] despite other fluids such as ethanol and R236ea showing better thermodynamic performance [48], and it has been successfully employed in small-scale ORC systems [49].…”

Section: Experimental Layoutmentioning

confidence: 99%

Design and Operational Control Strategy for Optimum Off-Design Performance of an ORC Plant for Low-Grade Waste Heat Recovery

et al. 2020

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The applicability of organic Rankine cycle (ORC) technology to waste heat recovery (WHR) is currently experiencing growing interest and accelerated technological development. The utilization of low-to-medium grade thermal energy sources, especially in the presence of heat source intermittency in applications where the thermal source is characterized by highly variable thermodynamic conditions, requires a control strategy for off-design operation to achieve optimal ORC power-unit performance. This paper presents a validated comprehensive model for off-design analysis of an ORC power-unit, with R236fa as the working fluid, a gear pump, and a 1.5 kW sliding vane rotary expander (SVRE) for WHR from the exhaust gases of a light-duty internal combustion engine. Model validation is performed using data from an extensive experimental campaign on both the rotary equipment (pump, expander) and the remainder components of the plant, namely the heat recovery vapor generator (HRVH), condenser, reservoirs, and piping. Based on the validated computational platform, the benefits on the ORC plant net power output and efficiency of either a variable permeability expander or of sliding vane rotary pump optimization are assessed. The novelty introduced by this optimization strategy is that the evaluations are conducted by a numerical model, which reproduces the real features of the ORC plant. This approach ensures an analysis of the whole system both from a plant and cycle point of view, catching some real aspects that are otherwise undetectable. These optimization strategies are considered as a baseline ORC plant that suffers low expander efficiency (30%) and a large parasitic pumping power, with a backwork ratio (BWR) of up to 60%. It is found that the benefits on the expander power arising from a lower permeability combined with a lower energy demand by the pump (20% of BWR) for circulation of the working fluid allows a better recovery performance for the ORC plant with respect to the baseline case. Adopting the optimization strategies, the average efficiency and maximum generated power increase from 1.5% to 3.5% and from 400 to 1100 W, respectively. These performances are in accordance with the plant efficiencies found in the experimental works in the literature, which vary between 1.6% and 6.5% for similar applications. Nonetheless, there is still room for improvement regarding a proper design of rotary machines, which can be redesigned considering the indications resulting from the developed optimization analysis.

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“…The optimised radial-axial turbine rotor comes from a single stage small power (50 kWe) ORC turbine operating on silica oil MM. ORC technology is especially suitable for cogeneration based on biomass and recovery heat [23][24][25]. The turbine was designed using a 0D approach in Matlab 2016a environment [26].…”

Section: D Optimisation Of a Radial-axial Turbine Rotormentioning

confidence: 99%

Efficiency Optimisation of Blade Shape in Steam and ORC Turbines

Lampart

Witanowski

Klonowicz

2018

Mechanics and Mechanical Engineering

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This paper is devoted to direct constrained optimisation of blading systems of large power and small power turbines so as to increase their internal efficiency. The optimisation is carried out using hybrid stochastic-deterministic methods such as a combination of a direct search method of Hooke-Jeeves and simulated annealing or a combination of a bat algorithm and simplex method of Nelder-Mead. Among free shape parameters are blade number and stagger angle, stacking blade line parameters and blade section (profile) parameters.One practical example of efficiency optimisation of turbine blading systems is modification of low load profiles PLK-R2 for high pressure (HP) stages of large power steam turbines. Another optimised geometry is that of an ORC radial-axial cogeneration turbine of 50 kWe. Up to 1% efficiency increase can easily be obtained from optimisation of HP blade profiles, especially by making the rotor blade more aft-loaded and reducing the intensity of endwall flows. Almost 2% efficiency rise was obtained for the optimised 50 kWe ORC turbine due to flow improvement at the suction side of the blade.

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Experimental investigation of domestic micro-CHP based on the gas boiler fitted with ORC module

Cited by 18 publications

References 12 publications

System effects of primary energy reduction connected with operation of the CHP plants

System effects of primary energy reduction connected with operation of the CHP plants

Design and Operational Control Strategy for Optimum Off-Design Performance of an ORC Plant for Low-Grade Waste Heat Recovery

Efficiency Optimisation of Blade Shape in Steam and ORC Turbines

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