scholarly journals A Multicriteria Model for Optimization of Maintenance in Thermal Energy Production Systems in Hospitals: A Case Study in a Spanish Hospital

2017 ◽  
Vol 9 (4) ◽  
pp. 493 ◽  
Author(s):  
María Carnero ◽  
Andrés Gómez
Keyword(s):  
Thermal Energy ◽  
Energy Production ◽  
Production Systems ◽  
Spanish Hospital ◽  
Multicriteria Model

scholarly journals Review-based Emergy Analysis of Energy Production

2015 ◽  
Vol 2 ◽  
pp. 85
Author(s):  
Ginta Cimdina ◽  
Toms Prodanuks ◽  
Dagnija Blumberga ◽  
Ivars Veidenbergs
Keyword(s):  
Thermal Energy ◽  
Energy Production ◽  
Production Systems ◽  
Emergy Analysis ◽  
Use Of Resources ◽  
State Economy ◽  
Definition Of ◽  
Economical Feasibility

The role of power and thermal energy is impossible to overestimate in development of both state economy sector and everyday life of households. Importance is connected with use of resources, economical feasibility and effect to climate changes. The optimization of energy production allows to promote development of sustainable society. The most popular and efficient technologies for generation of power and thermal energy are cogeneration plants (CHP). Traditional evaluation methodologies of energy production systems are based on analysis of energy and mass balances as well as on cost analysis. It is not enough for assessment of complete sustainability of system. Necessary environmental impact assessment of energy production is possible to implement by use of emergy analysis. Definition of emergy includes one type of energy, which is used directly or indirectly to produce materials, provide services and finances. Emergy dimension is emjoules (seJ.). Paper presents case study of emergy analysis of different operation modes of one cogeneration plant.

scholarly journals Modelling and simulation of a wind energy system

2019 ◽  
Vol 112 ◽  
pp. 02009
Author(s):  
Cristian-Gabriel Alionte ◽  
Liviu-Marian Ungureanu
Keyword(s):  
Wind Energy ◽  
Energy Production ◽  
Production Systems ◽  
Weather Conditions ◽  
Energy System ◽  
Mechatronic System ◽  
Automatic Structure ◽  
Wind Energy System ◽  
Wind Energy Systems

Nowadays, wind energy systems are the most efficient systems of all renewable energy production systems. Therefore, all sizes and types of this kind of systems are available, but there are few portable systems which can be temporarily mounted in certain isolated areas. We propose in this case study another solution as an alternative: an adaptable mechatronic system which can withstand even in very difficult and challenging weather conditions due to their active surfaces that have reconfigurable automatic structure.

Water-Thermal Energy Production System (WEPS). A Case Study from Norway

2017 ◽  
Author(s):  
Johannes Idsø ◽  
Torbjørn Årethun
Keyword(s):  
Renewable Energy ◽  
Thermal Energy ◽  
Production System ◽  
Energy Production ◽  
Production Capacity ◽  
Pipeline System ◽  
Energy Prices ◽  
External Effects ◽  
Energy Production System

The purpose of this paper is to describe a new way of producing renewable energy based on fjords as a water heater. We will call this system the Water-thermal Energy Production System (WEPS), because the basic idea is to extract heating and cooling energy from water. Although a prototype of WEPS has existed in Norway for more than ten years, a WEPS currently in operation has not been financially analyzed in the literature. Coastal parts of Norway have a potential of 5 TWh of profitable WEPS-facilities [9], due to convenient access to fjords containing water with stable all-season temperatures of about 4–12C when the depth of the water is about 50 meters. This stability of the water temperature makes it possible to extract energy from the fjord in a very efficient way. The potential for economically-profitable WEPS in other parts of the world has not been estimated. In order to answer such a question, more research is required. We have conducted a case study of a WEPS located in the Norwegian municipality of Eid. This is the first full-scale Norwegian WEPS, and it has been operating since 2006. The nascent years have passed, and the technology has been in operation for some years. In this paper, we have made an estimate of the business profitability and the external effects based on past empirical evidence and some assumptions about future development in some key figures. The results suggests that WEPS-Eid has been a profitable investment carrying a positive internal rate of revenue, even if the present underutilization in production capacity will continue in the future. Stability in energy prices for heating purposes has also gained customers compared to the more volatile prices of alternative renewable energy, like hydropower or wind turbines. The negative, external effects in the operating phase from WEPS-Eid are insignificant. Despite the significant profitability of the WEPS facility in Eid, there are two main obstacles for new entrants. There is a lack of relevant operational information for potential investors due to few facilities. This leads to uncertainty, and investments in WEPS appear as a risky business. Secondly, construction of a WEPS requires both big financial investments in digging and facilitating long trenches for a pipeline system and time and effort spent on acquiring the licenses needed for doing this work. A coordinating unit is probably required in order to get the necessary public and private licenses and to reduce fixed costs by coordinating other tasks in the same trenches, like pipes for water and sewer, fiber cables and tele-cables. In Eid, the local municipal administration was the coordinating unit.

scholarly journals Water-Thermal Energy Production System: A Case Study from Norway

2017 ◽  
Vol 9 (9) ◽  
pp. 1665
Author(s):  
Johannes Idsø ◽  
Torbjørn Årethun
Keyword(s):  
Thermal Energy ◽  
Production System ◽  
Energy Production ◽  
System A ◽  
Energy Production System
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