Gear Pump for Low Power Output ORC – an Efficiency Analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21720%2F17%3A00316371" target="_blank" >RIV/68407700:21720/17:00316371 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S1876610217341425" target="_blank" >http://www.sciencedirect.com/science/article/pii/S1876610217341425</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.egypro.2017.09.227" target="_blank" >10.1016/j.egypro.2017.09.227</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Gear Pump for Low Power Output ORC – an Efficiency Analysis

Popis výsledku v původním jazyce

A pump is a necessary component of ORC units. Although it is simple in a principle and various pump types can be used, reality may easily bring many complications. When designing an ORC for very low power output applications (1-10 kW gross power production), problems such as leakages, mechanical and electrical losses are more significant. Using a tight and reliable pump, typically of a diaphragm type, results in extremely low efficiency, which negatively affects the overall cycle performance. We propose for micro ORC units a gear pump. Typical losses in a gear pump and their contributions with respect to issues that need to be overcome (hermetic seal requirement, reliability and overall efficiency) are described in general in the first part of this paper. The losses are volumetric, mechanical and also electrical of motor and variable frequency drive. In the second part of the paper we present the measured characteristics of the modified commercially available gear pump. The pump is intended for an ORC with a net power output of 1-10 kW. Characteristics are given for both a standalone pump and the pump coupled with an asynchronous motor. They show significantly higher efficiency than typically reported in the literature. Contribution of different losses is discussed. Mechanical losses influence operation of the pump at low pressures (lower hydraulic work but nearly constant power input) while volumetric losses at higher pressure have only small effect. The largest loss comes from electrical efficiencies of motor and variable frequency drive, especially for operation at low speed. Optimizing the operating conditions of the pump together with the motor is therefore the most important in terms of reducing pump power consumption.

Název v anglickém jazyce

Gear Pump for Low Power Output ORC – an Efficiency Analysis

Popis výsledku anglicky

A pump is a necessary component of ORC units. Although it is simple in a principle and various pump types can be used, reality may easily bring many complications. When designing an ORC for very low power output applications (1-10 kW gross power production), problems such as leakages, mechanical and electrical losses are more significant. Using a tight and reliable pump, typically of a diaphragm type, results in extremely low efficiency, which negatively affects the overall cycle performance. We propose for micro ORC units a gear pump. Typical losses in a gear pump and their contributions with respect to issues that need to be overcome (hermetic seal requirement, reliability and overall efficiency) are described in general in the first part of this paper. The losses are volumetric, mechanical and also electrical of motor and variable frequency drive. In the second part of the paper we present the measured characteristics of the modified commercially available gear pump. The pump is intended for an ORC with a net power output of 1-10 kW. Characteristics are given for both a standalone pump and the pump coupled with an asynchronous motor. They show significantly higher efficiency than typically reported in the literature. Contribution of different losses is discussed. Mechanical losses influence operation of the pump at low pressures (lower hydraulic work but nearly constant power input) while volumetric losses at higher pressure have only small effect. The largest loss comes from electrical efficiencies of motor and variable frequency drive, especially for operation at low speed. Optimizing the operating conditions of the pump together with the motor is therefore the most important in terms of reducing pump power consumption.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/LO1605" target="_blank" >LO1605: Univerzitní centrum energeticky efektivních budov – Fáze udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Energy Procedia - 4th International Seminar on ORC Power Systems

ISBN

—

ISSN

1876-6102

e-ISSN

—

Počet stran výsledku

8

Strana od-do

1002-1009

Název nakladatele

Elsevier Ltd

Místo vydání

Oxford

Místo konání akce

Milano

Datum konání akce

13. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000411758800128