Semi-empirical model of a multi-diaphragm pump in an Organic Rankine Cycle (ORC) experimental unit

D’Amico, F.; Pallis, Platon; Leontaritis, Aris-Dimitrios; Karellas, Sotiriοs; Kakalis, Nikolaos Matthaios; Rech, Sergio; Lazzaretto, Andrea

doi:10.1016/j.energy.2017.10.127

Cited by 28 publications

(18 citation statements)

References 11 publications

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“…Before reaching the minimum sustainable value that prevents the system from collapsing, many intermediate points are registered. Unlike the results reported by Declaye [37] Pallis, et alin [47] and among the conclusions of Leontaritis, Pallis, et al reported in [55]: higher rotational speeds encourage cavitation occurrence. The latter conclusions were thoroughly defined at section 3.1 as a result of the first experimental campaign of the ORC test unit.…”

Section: -Scroll Generating Mode -F = 285 Hz -Scroll Rpm = 1450 -Variable Flow Rate and Temperature Of The Subcooling Water (Test D)contrasting

confidence: 61%

“…All experimental data derived from the second test campaign were used in parallel research activities [45], [47], [61] & [62]. The main goal was to establish models of critical components.…”

Section: Conclusion From the Second Experimental Campaign Resultsmentioning

confidence: 99%

“…Since there is no torque meter between the motor and the pump, this equation has a key role in the determination of the mechanical power as pump input. It has also been used in the semi-empirical model of D'Amico, Pallis et.al [47] for the same pump and it was used during this study as well, in order to investigate the behaviour of the electric motor.…”

Section: Figure 25: Specifications Of the Pump As Provided By The Manufacturer[36]mentioning

confidence: 99%

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Experimental investigation and economic assessment of a fully automated organic Rankine cycle for waste heat recovery from marine engine jacket cooling water

Pallis¹,

Πάλλης²

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Η διδακτορική διατριβή επικεντρώθηκε στην αξιοποίηση της απορριπτόμενης θερμότητας κινητήρων εσωτερικής καύσης και πιο συγκεκριμένα από το κύκλωμα νερού ψύξης του χιτωνίου. Στα πλαίσια της πραγματοποιήθηκε η κατασκευή, η πειραματική αξιολόγηση, διερεύνηση και η πλήρη αυτοματοποίηση ενός συστήματος αξιοποίησης απορριπτόμενης θερμότητας για παραγωγή ηλεκτρικής ενέργειας με τη χρήση οργανικού κύκλου Rankine, ειδικά σχεδιασμένο για το κύκλωμα ψύξης του χιτωνίου ενός ναυτικού πετρελαιοκινητήρα.

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Section: -Scroll Generating Mode -F = 285 Hz -Scroll Rpm = 1450 -Variable Flow Rate and Temperature Of The Subcooling Water (Test D)contrasting

confidence: 61%

Section: Conclusion From the Second Experimental Campaign Resultsmentioning

confidence: 99%

Section: Figure 25: Specifications Of the Pump As Provided By The Manufacturer[36]mentioning

confidence: 99%

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Experimental investigation and economic assessment of a fully automated organic Rankine cycle for waste heat recovery from marine engine jacket cooling water

Pallis¹,

Πάλλης²

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“…Cavitation affects the stability of the system, resulting in a decrease of system efficiency. D'amico et al [28] introduced the thermodynamic model of a piston pump in the ORC and proposed the prediction of available head margin to avoid cavitation. Liu et al [29] found that cavitation can occur when the working fluid was insufficient and proposed overcharging working fluid to avoid cavitation.…”

Section: Introductionmentioning

confidence: 99%

Investigating the System Behaviors of a 10 kW Organic Rankine Cycle (ORC) Prototype Using Plunger Pump and Centrifugal Pump

et al. 2020

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Based on a 10-kW organic Rankine cycle (ORC) experimental prototype, the system behaviors using a plunger pump and centrifugal pump have been investigated. The heat input is in the range of 45 kW to 82 kW. The temperature utilization rate is defined to appraise heat source utilization. The detailed components' behaviors with the varying heat input are discussed, while the system generating efficiency is examined. The exergy destruction for the four components is addressed finally. Results indicated that the centrifugal pump owns a relatively higher mass flow rate and pump isentropic efficiency, but more power consumption than the plunger pump. The evaporator pressure drops are in the range of 0.45-0.65 bar, demonstrating that the pressure drop should be considered for the ORC simulation. The electrical power has a small difference using a plunger pump and a centrifugal pump, indicating that the electric power is insensitive on the pump types. The system generating efficiency for the plunger pump is approximately 3.63%, which is 12.51% higher than that of the centrifugal pump. The exergy destruction for the evaporator, expander, and condenser is almost 30%, indicating that enhancing the temperature matching between the system and the heat (cold) source is a way to improve the system performance.

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“…Molinaroli et al [8] introduced a semi-empirical model of a rolling piston compressor, designed for different applications and working with different refrigerants, validating the results with manufacturer data. D'amico et al [9] presented a semiempirical thermodynamic model of a displacement pump integrated into an ORC experimental unit, where the pump behavior at design and off-design conditions is modeled as a set of thermodynamic processes, whose main geometrical parameters are calibrated using experimental data.…”

Section: Nomenclature Introductionmentioning

confidence: 99%

Application and comparison of semi-empirical models for performance prediction of a kW-size reciprocating piston expander

et al. 2019

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This work presents the modeling and performance prediction of a prototypal reciprocating piston expander in the kW range of power. Two semi-empirical models have been selected from the literature and opportunely adapted to the case of study, then calibrated and validated over a full set of available experimental data. The first modelling approach is based on polynomial correlations of the expander efficiencies and it has been extended to account for the heat losses to ambient. The second one consists of a lumped parameters approach, that uses a few key geometrical data of the expander and some physical equations to describe the expansion process. The aim of this study is to detect the best approach, between those selected, for the simulation of reciprocating expander adopted in micro-scale ORC systems; this can provide a helpful tool for predicting the performance of machines in off-design conditions, not requiring detailed information on its internal geometry. The calibration and validation procedures of the selected models have been performed thanks to an extensive experimental campaign on a test bench facility installed at the laboratory of the University of Bologna. Models comparison highlights that the lowest mean relative error value is obtained on the prediction of exhaust temperature, equal to 1 % and 2 % respectively for the polynomial and lumped model. Maximum relative errors are obtained in the prediction of rotational speed for the polynomial fitting model (equal to 10 %), and in the electric power output for the lumped approach (equal to 8 %). The global error function, calculated over the validation data set, is close to 5 % for both the applied modelling approaches. Within the calibration range, the semi-empirical models show similar performance results of the output variables (i.e. electric power output, isentropic electric efficiency, rotational speed and filling factor). Conversely, when compared outside of the calibration range, prediction maps can substantially differ: the polynomial fitting functions model proves to be less accurate in the unexplored range of working conditions, overestimating the expander rotational speed while underestimating the value of the filling factor at high pressure ratios, and overestimating the isentropic electric efficiency values at low pressure ratios.

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Semi-empirical model of a multi-diaphragm pump in an Organic Rankine Cycle (ORC) experimental unit

Cited by 28 publications

References 11 publications

Experimental investigation and economic assessment of a fully automated organic Rankine cycle for waste heat recovery from marine engine jacket cooling water

Experimental investigation and economic assessment of a fully automated organic Rankine cycle for waste heat recovery from marine engine jacket cooling water

Investigating the System Behaviors of a 10 kW Organic Rankine Cycle (ORC) Prototype Using Plunger Pump and Centrifugal Pump

Application and comparison of semi-empirical models for performance prediction of a kW-size reciprocating piston expander

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