Performance analysis of bladeless jet propulsion micro-steam turbine for micro-CHP (combined heat and power) systems utilizing low-grade heat sources

Kim, Chul-Kyu; Yoon, Jasang

doi:10.1016/j.energy.2016.01.070

Cited by 27 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Energy charge savings via hydrogen blended natural gas in a 5 kW el ICE-based micro-CHP was investigated and reported by Santoli et al [14]. Other heat engine-based cogeneration systems investigated included heat engines such as stirling (SE) [15], micro gas (MGT) [16] and steam turbines (MST) [17], suitable for a multi-family dwelling application.…”

Section: Relevant Workmentioning

confidence: 99%

“…Although the benefits of installing a resilient cogeneration device on site are well understood, the optimal size of such a system, and the sensitivities associated with the heatto-power ratio, electrical efficiency and power rating for residential building applications, are still unclear. Numerous investigations suggested a wide range of electrical power ratings [10] for residential scale PM, varying from 1.5 kW [39] to 5 kW [14] for ICEbased systems, 0.65 kW [31] to 7 kW [40] for ORC-based devices, 5 kW [17] with a MST device, 0.7 kW [18] to 6 kW [19] for FC-based systems, and up to 250 W using TE/TPV devices [29,31]. As can be seen, there is a high degree of variance in the electrical efficiency and the suggested electrical power rating of the cogeneration system when applied in different residential environments.…”

Section: Problem Statementmentioning

confidence: 99%

See 1 more Smart Citation

Decarbonization of Residential Building Energy Supply: Impact of Cogeneration System Performance on Energy, Environment, and Economics

Cheekatamarla

2021

Energies

View full text Add to dashboard Cite

Electrical and thermal loads of residential buildings present a unique opportunity for onsite power generation, and concomitant thermal energy generation, storage, and utilization, to decrease primary energy consumption and carbon dioxide intensity. This approach also improves resiliency and ability to address peak load burden effectively. Demand response programs and grid-interactive buildings are also essential to meet the energy needs of the 21st century while addressing climate impact. Given the significance of the scale of building energy consumption, this study investigates how cogeneration systems influence the primary energy consumption and carbon footprint in residential buildings. The impact of onsite power generation capacity, its electrical and thermal efficiency, and its cost, on total primary energy consumption, equivalent carbon dioxide emissions, operating expenditure, and, most importantly, thermal and electrical energy balance, is presented. The conditions at which a cogeneration approach loses its advantage as an energy efficient residential resource are identified as a function of electrical grid’s carbon footprint and primary energy efficiency. Compared to a heat pump heating system with a coefficient of performance (COP) of three, a 0.5 kW cogeneration system with 40% electrical efficiency is shown to lose its environmental benefit if the electrical grid’s carbon dioxide intensity falls below 0.4 kg CO2 per kWh electricity.

show abstract

Section: Relevant Workmentioning

confidence: 99%

Section: Problem Statementmentioning

confidence: 99%

Decarbonization of Residential Building Energy Supply: Impact of Cogeneration System Performance on Energy, Environment, and Economics

Cheekatamarla

2021

Energies

View full text Add to dashboard Cite

show abstract

“…Considering water vapor, the literature offers three different approaches of small-scale steam turbines. The company Green Turbine [11] offers an axial impulse steam turbine coupled to a generator with a maximum electrical power of 1400 W. Kim et al [12] investigated an array of Hero turbines (also know as aeolipe) with a diameter of 144 mm, reaching an electrical power of 1500 W, a mechanical power of 4650 W, and a total-to-static isentropic efficiency of 20 %. Placco et al [13] investigated a 70 mm Tesla turbine and measured a mechanical power of 18 W (dynamometer) and an isentropic efficiency of 25 %.…”

Section: Yearmentioning

confidence: 99%

“…The turbine reaction is calculated according to eq. (12), where the rotor-stator static pressure is evaluated as the line-averaged static pressure at the turbine shroud at the rotor-stator interface #1 in Figure 4.…”

Section: Numerical Setupmentioning

confidence: 99%

Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine With Partial-Admission

Wagner

herle

Schiffmann

2020

Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small

View full text Add to dashboard Cite

A micro steam turbine with a tip diameter of 15 mm was designed and experimentally characterized. At the nominal mass flow rate and total-to-total pressure ratio of 2.3 kg h−1 and 2, respectively, the turbine yields a power of 34 W and a total-to-static isentropic efficiency of 37%. The steam turbine is conceived as a radial-inflow, low-reaction (15%), and partial admission (21%) machine. Since the steam mass flow rate is limited by the heat provided of the system (solid oxide fuel cell), a low-reaction and high-power-density design is preferred. The partial-admission design allows for reduced losses: The turbine rotor and stator blades are prismatic, have a radial chord length of 1 mm and a height of 0.59 mm. Since the relative rotor blade tip clearance (0.24) is high, the blade tip leakage losses are significant. Considering a fixed steam supply, this design allows to increase the blade height, and thus reducing the losses. The steam turbine drives a fan, which operates at low Mach numbers. The rotor is supported on dynamic steam-lubricated bearings; the nominal rotational speed is 175 krpm. A numerical simulation of the steam turbine is in good agreement with the experimental results. Furthermore, a novel test rig setup, featuring extremely-thin thermocouples (ϕ0.15 mm) is investigated for an operation with ambient and hot air at 220 °C. Conventional zero and one-dimensional pre-design models correlate well to the experimental results, despite the small size of the turbine blades.

show abstract

“…1. Compared to micro turbines [15] of the same size, its particular design has the advantage of eliminating losses due to the excessive partial admission annulus degree and to the small blade passages dimensions, which in traditional axial turbines are necessary to guarantee extremely low flow rates. Moreover, the turbine prototype efficiency is little variable, in a wide set of operating conditions.…”

Section: Turbine Prototypementioning

confidence: 99%

Possibility of employing a small power tangential flow turbine prototype in a micro solar concentration plant

Amelio¹,

Barbarelli²,

Rovense³

et al. 2017

IJHT

View full text Add to dashboard Cite

This article describes a hypothetical use in a micro solar plant of a small power tangential flow turbine prototype, built and tested at the Department of Mechanical, Energy and Management Engineering (DIMEG) of the University of Calabria. The turbine prototype has the ability to recover efficiently energy from small sources, better than other turbines of the same size, in a wide set of operating conditions and power operations, having the possibility to regulate the flow rate without excessive losses. The micro solar powered central unit is conceived with Parabolic Trough Collectors (PTCs): the vapor pressure analysis extends from 5 to 25 bar, while the inlet turbine temperatures considered are included in the range from 180 to 283 °C. Steam pressure at the turbine discharge has been set to 1 bar, simplifying so the plant complexity and making possible CHP generation. The solar field has been dimensioned, for each of the cases examined, in relation to the rated operating temperature and steam flow rate supplying the turbine. Finally, the last 25 bar configuration has been analyzed in more detail by extrapolating the annual energy output and the average efficiency of the overall cycle, also considering the cogeneration contribution.

show abstract

Performance analysis of bladeless jet propulsion micro-steam turbine for micro-CHP (combined heat and power) systems utilizing low-grade heat sources

Cited by 27 publications

References 22 publications

Decarbonization of Residential Building Energy Supply: Impact of Cogeneration System Performance on Energy, Environment, and Economics

Decarbonization of Residential Building Energy Supply: Impact of Cogeneration System Performance on Energy, Environment, and Economics

Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine With Partial-Admission

Possibility of employing a small power tangential flow turbine prototype in a micro solar concentration plant

Contact Info

Product

Resources

About