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1. An efficient looped multiple-stage thermoacoustically-driven cryocooler for liquefaction and recondensation of natural gas

Author:
Xu, Jingyuan; Zhang, Limin; Hu, Jianying; Wu, Zhanghua; Bi, Tianjiao; Dai, Wei; Luo, Ercang
Source:
Energy 2016 v.101 pp. 427-433
ISSN:
0360-5442
Subject:
liquefied natural gas; mathematical models; liquefaction; heat; acoustics; temperature; exergy
Abstract:
... With increasing demand for liquefied natural gas, high-efficiency and compact facilities are vital for dealing with natural gas liquefaction or boiled-gas recondensation. This study introduces a looped multiple-stage thermoacoustically-driven cryocooler system that operates in the temperature range of natural gas liquefaction and which has good prospects for meeting such demand. Because of the loo ...
DOI:
10.1016/j.energy.2016.01.085

2. A reliability-based optimization of membrane-type total heat exchangers under uncertain design parameters

Author:
Zhang, Li-Zhi
Source:
Energy 2016 v.101 pp. 390-401
ISSN:
0360-5442
Subject:
algorithms; costs and returns; energy; energy conservation; equipment; heat; heat exchangers; interest (finance); manufacturing; system optimization; uncertainty; ventilators; weather
Abstract:
... Membrane-type Total heat exchangers (Heat and moisture recovery ventilators) have become key components for building energy conservation. Various materials and duct structures have been proposed to find an improved energy performance and a better economic return. However most previous optimizations of total heat exchangers are limited to deterministic design parameters whereas operational flexibil ...
DOI:
10.1016/j.energy.2016.02.032

3. Combustion study of a spark-ignition engine from pressure cycles

Author:
Djouadi, Amel; Bentahar, Fatiha
Source:
Energy 2016 v.101 pp. 211-217
ISSN:
0360-5442
Subject:
burning; combustion; fuels; gases; heat; hydrogen; methane; models; spark ignition engines; specific heat; temperature
Abstract:
... This work presents investigations on combustion analysis of an experimental spark-ignition engine fueled specially by a mixture of 15% in volume of hydrogen and 85% in volume of methane with an equivalence ratio of 0.67 at 100% load, corresponding to optimum conditions for SI engine, using two models, zero dimensional model based on Rassweiller & Withrow theory and first law-single zone either at ...
DOI:
10.1016/j.energy.2016.02.013

4. Energy-efficient building retrofits: An assessment of regulatory proposals under uncertainty

Author:
Rocha, Paula; Kaut, Michal; Siddiqui, Afzal S.
Source:
Energy 2016 v.101 pp. 278-287
ISSN:
0360-5442
Subject:
European Union; buildings; carbon dioxide; economic sustainability; energy costs; energy efficiency; equipment; greenhouse gas emissions; heat; managers; primary energy; risk; risk management; uncertainty; Austria; Spain
Abstract:
... Improving energy efficiency in European Union buildings will require retrofitting much of the existing stock due to limited new construction opportunities. Given uncertainty in energy prices and technology costs stemming from deregulation, a stochastic optimisation framework is desirable for long-term decision support. We synthesise treatment of uncertainty and risk management to obtain insights a ...
DOI:
10.1016/j.energy.2016.01.037

5. Flexible pyroelectric generators for scavenging ambient thermal energy and as self-powered thermosensors

Author:
Zhang, Hulin; Xie, Yuhang; Li, Xiaomei; Huang, Zhenlong; Zhang, Shangjie; Su, Yuanjie; Wu, Bo; He, Long; Yang, Weiqing; Lin, Yuan
Source:
Energy 2016 v.101 pp. 202-210
ISSN:
0360-5442
Subject:
electric power; harvesting; heat; light emitting diodes; liquid crystal display; temperature; thermal energy; thermoplastics
Abstract:
... Wasted heat is one of the most abundant and widely available energy sources in our living environment and industrial activities. A lot of attentions have been paid on harvesting ambient wasted thermal energy. In this work, a flexible PG (pyroelectric generator) based upon a thin PVDF (polyvinylidene fluoride) film has been fabricated. Based on the pyroelectric effect, the PG can harvest thermal en ...
DOI:
10.1016/j.energy.2016.02.002

6. Influence of system design on heat distribution costs in district heating

Author:
Nussbaumer, T.; Thalmann, S.
Source:
Energy 2016 v.101 pp. 496-505
ISSN:
0360-5442
Subject:
capital; electricity costs; fuels; heat; insulating materials; prices; systems engineering
Abstract:
... The study introduces an economic analysis for district heating networks from 0.5 MW to 4 MW. The reference case describes a linear network with 1 MW input, 1 km pipeline length, and 2000 annual full-load hours corresponding to a linear heat density of 2 MWh input per year and meter of pipeline. Pipe diameter, connection load, fuel price, electricity price, and insulation class are investigated and ...
DOI:
10.1016/j.energy.2016.02.062

7. Optimization of a heat assisted air-conditioning system comprising membrane and desiccant technologies for applications in tropical climates

Author:
Safizadeh, M. Reza; Morgenstern, Alexander; Bongs, Constanze; Henning, Hans-Martin; Luther, Joachim
Source:
Energy 2016 v.101 pp. 52-64
ISSN:
0360-5442
Subject:
air; air conditioning; algorithms; cooling; cost effectiveness; dehumidification; desiccants; electric energy consumption; evaporation; heat; operating costs; temperature; tropics; Singapore
Abstract:
... Separating dehumidification and cooling loads in air-conditioning systems has been proven to be a potential strategy to reduce electricity consumption if the dehumidification of air is mostly performed by heat-powered system components. Referring to experimental experiences in Singapore, this paper presents a novel electricity-efficient air-conditioning system consisting of a membrane unit, an eva ...
DOI:
10.1016/j.energy.2016.02.007

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

Author:
Kim, Chul Kyu; Yoon, Joon Yong
Source:
Energy 2016 v.101 pp. 411-420
ISSN:
0360-5442
Subject:
droplets; electric power; heat; steam; turbines
Abstract:
... Recently, the micro CHP (combined heat and power) systems were developed to utilize the various low-grade heat sources in the industrial and residential sectors. However, the low-grade heat sources for micro-CHP systems were unsuitable for application to the conventional blade-type micro-steam turbines, because the low-grade heat sources of the saturated steam conditions included with condensing d ...
DOI:
10.1016/j.energy.2016.01.070

9. Theoretical performance analysis of hydrate-based heat engine system suitable for low-temperature driven power generation

Author:
Ohfuka, Yugo; Ohmura, Ryo
Source:
Energy 2016 v.101 pp. 27-33
ISSN:
0360-5442
Subject:
dissociation; energy conversion; enthalpy; heat; methane; power generation; propane; sustainable technology; temperature; thermal energy
Abstract:
... We analyzed a heat engine using clathrate hydrate as its working media and evaluate the performance of this system operated with high and low temperature reservoirs of 295 K and 280 K “OTEC (Ocean Thermal Energy Conversion)” may be a prospective example of the technologies utilizing the small-temperature difference for power generation. This heat engine generates mechanical power through the cycle ...
DOI:
10.1016/j.energy.2016.01.095