Presenting a power and cascade cooling cycle driven using solar energy and natural gas

2022 ◽  
Author(s):  
Vajihe Davoodi ◽  
Parisa Kazemiani-Najafabadi ◽  
Ehsan Amiri Rad
Keyword(s):  
Natural Gas ◽  
Solar Energy ◽  
Cooling Cycle

Complex Energy Systems Exploiting Solar Energy and Natural Gas Vaporization

2002 ◽  
Author(s):  
Giacomo Bisio ◽  
Alessandro Bosio ◽  
Marco Cartesegna ◽  
Giuseppe Rubatto
Keyword(s):  
Natural Gas ◽  
Solar Energy ◽  
Fossil Fuel ◽  
Energy Systems ◽  
Electrical Energy ◽  
Thermal Source ◽  
End User ◽  
Gas Source ◽  
Considerable Impact ◽  
Liquid Natural Gas

The fossil fuel reserves are limited. In addition, usable energy supply has a considerable impact on the environment, even if some effects, which are usually alleged, are far from being fully established. Natural gas is often found in remote locations far from developed industrial nations. Where possible, the gas is transported by pipeline to the end user. However, where oceans separate the gas source and the user, or there are other difficulties, the only viable way to transport the gas is to convert it into liquid natural gas (LNG) and to convey it using insulated LNG tankers. This paper outlines the results of an examination of a complex system, employing solar energy, for the production of electrical energy and the vaporization and superheating of LNG. It is to be remarked that, differently from the usual combined systems, both the thermal source and the thermal sink are exergy sources.

Investments in Renewable and Conventional Energy: The Role of Operational Flexibility

2020 ◽  
Vol 22 (5) ◽  
pp. 925-941 ◽  
Author(s):  
A. Gürhan Kök ◽  
Kevin Shang ◽  
Şafak Yücel
Keyword(s):  
Natural Gas ◽  
Solar Energy ◽  
Wind Energy ◽  
Power Plants ◽  
Problem Definition ◽  
Policy Implications ◽  
Operational Flexibility ◽  
Capacity Investment ◽  
Optimal Capacity ◽  
Investment Level

Problem definition: There is an ongoing debate on how providing a subsidy for one energy source affects the investment level of other sources. Academic/practical relevance: To investigate this issue, we study a capacity investment problem for a utility firm that invests in renewable and conventional energy, with a consideration of two critical factors. First, conventional sources have different levels of operational flexibility—inflexible (e.g., nuclear and coal) and flexible (e.g., natural gas). Second, random renewable energy supply and electricity demand are correlated and nonstationary. Methodology: We model this problem as a two-stage stochastic program in which a utility firm first determines the capacity investment levels followed by the dispatch quantities of energy sources to minimize the sum of investment and generation-related costs. Results: We derive the optimal capacity portfolio to characterize the interactions between renewable and conventional sources. Policy implications: We find that renewable and inflexible sources are substitutes, suggesting that a subsidy for nuclear or coal-fired power plants leads to a lower investment level in wind or solar energy. However, wind energy and flexible sources are complements. Thus, a subsidy for flexible natural gas-fired power plants leads to a higher investment in wind energy. This result holds for solar energy if the subsidy for the flexible source is sufficiently high. We validate these insights by using real electricity generation and demand data from the state of Texas.

Modeling an Integral Dual Solar/Gas Fired Generator for a Water-Lithium Bromide Absorption Chiller

1999 ◽  
Author(s):  
Jiming Cao ◽  
Richard N. Christensen
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Solar Energy ◽  
Current Flow ◽  
Lithium Bromide ◽  
Absorption Chiller ◽  
Transfer Resistance ◽  
Subcooled Liquid ◽  
Bromide Solution ◽  
Lithium Bromide Solution

Abstract This paper presents a design process for a dual solar/gas fired generator. A generator fired by solar energy and/or natural gas for a water-lithium bromide absorption chiller of 25 refrigeration tons (RT) was modeled. The natural gas is considered as the backup heat when the solar energy is unavailable or insufficient. The flue gas and the water-lithium bromide solution are in co-current flow, while the solar fluid and the water-lithium bromide solution are in counter-current flow. Fifty fluted tubes were installed vertically between two concentric cylindrical tubes. A solid ceramic insert was used to enhance heat transfer on the gas side that is considered as having the dominant heat transfer resistance. The burner is installed inside the smaller cylindrical tube. The solar fluid from the solar collector enters the generator through the fluted tubes while the water-lithium bromide mixture flows in the annular channel around the fluted tubes as a subcooled liquid. The generator is divided into two regions according to the heat transfer mechanism: subcooled liquid region and desorption region. In this model, a simultaneous solar and gas fired desorption process was investigated. The amount of makeup heat needed from natural gas was determined as a function of the solar fluid flow rate. Local temperature profiles were predicted by the model.

The Second Century Papers: Looking Ahead in Aeronautics—8

1968 ◽  
Vol 72 (693) ◽  
pp. 735-738
Author(s):  
M. W. Thring
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
Solar Energy ◽  
Fuel Consumption ◽  
Second Century ◽  
Nuclear Fuels ◽  
Power Sources ◽  
Aircraft Fuel ◽  
Oil And Natural Gas

Power generation for civilian aircraft can only be considered in terms of what kind of flying people will want to do in the 2nd century because the weight and cost of the fuel which will be best are dependent on how much people can afford to pay, how large and how fast they want the planes to be and what the world's total aircraft fuel consumption will be in relation to the world's total supplies of various fuels. The predictable primary power sources of the second century are the fossil chemical fuels, oil and natural gas, the nuclear fuels (fission and fusion) and solar energy.

Hydrogen Production by Solar Reforming of Natural Gas: A Comparison Study of Two Possible Process Configurations

2005 ◽  
Vol 128 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Stephan Möller ◽  
Dario Kaucic ◽  
Christian Sattler
Keyword(s):  
Hydrogen Production ◽  
Natural Gas ◽  
Solar Energy ◽  
Cost Study ◽  
Fuel Savings ◽  
Production Of Hydrogen ◽  
Production Technologies ◽  
The Cost ◽  
Favorable Conditions ◽  
Renewable Hydrogen

Solar steam reforming of natural gas (NG) is a possibility to lower the cost for introducing renewable hydrogen production technologies to the market by a combination of fossil fuel and solar energy. It comprises the production of hydrogen from NG and steam that acts as a chemical storage for hydrogen and solar energy as the renewable energy source to heat up the system and set free the hydrogen. Using the solar reformer technology fuel savings of up to 40% compared to a conventional plant are expected. The CO2 emissions can be reduced accordingly. The cost study shows that hydrogen produced by solar reforming might cost between 4.5 and 4.7ct€∕kWh (LHV of H2) today. Therefore, it is only about 20% more expensive than conventionally produced hydrogen. Rising prices for NG will result in favorable conditions for the solar technology.

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