Towards nZEB—Sustainable Solutions to Meet Thermal Energy Demand in Office Buildings

2014 ◽  
pp. 115-133
Author(s):  
Macedon Moldovan ◽  
Ion Visa ◽  
Daniela Ciobanu
Keyword(s):  
Thermal Energy ◽  
Energy Demand ◽  
Office Buildings ◽  
Sustainable Solutions

scholarly journals Sustainable solutions for thermal energy saving in hospital operating theatres

2019 ◽  
Vol 85 ◽  
pp. 01002 ◽  
Author(s):  
Gonzalo Sánchez-Barroso Moreno ◽  
Justo García-Sanz Calcedo ◽  
Alfonso G. González ◽  
David R. Salgado
Keyword(s):  
Energy Consumption ◽  
Flow Rate ◽  
Thermal Energy ◽  
Energy Demand ◽  
High Performance ◽  
Energy Savings ◽  
Air Flow ◽  
Indoor Environmental Quality ◽  
Sustainable Solutions ◽  
Operating Theatres

Heating, ventilating and air conditioning systems in hospital operating theatres consume high amounts of energy, operate for long periods of time and provide high performance. For this reason, it is necessary to study their energy consumption and determine sustainable solutions that optimize their operation and improve their performance. In this paper, annual thermal energy consumption of a conventional operating theatre is evaluated. Potential energy savings is evaluated by maintaining an adequate indoor environmental quality for these rooms. In addition, how to minimize energy consumption depending on the air renewal flow rate used and installing a sensible heat recovery system was studied. Results show that energy demand of an operating room is reduced by 24.1% by recirculating 25% of air flow extracted from the room. Energy cost decreases 44.31% by increasing the recirculated air flow rate to 50% of the air flow extracted from the room.

scholarly journals Control Strategies for Daylight and Artificial Lighting in Office Buildings—A Bibliometrically Assisted Review

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3852
Author(s):  
Daniel Plörer ◽  
Sascha Hammes ◽  
Martin Hauer ◽  
Vincent van Karsbergen ◽  
Rainer Pfluger
Keyword(s):  
Energy Efficiency ◽  
Energy Demand ◽  
Control Strategies ◽  
Significant Proportion ◽  
Decisive Role ◽  
Future Trend ◽  
Office Buildings ◽  
Total Energy Consumption ◽  
Integral Control ◽  
Artificial Lighting

A significant proportion of the total energy consumption in office buildings is attributable to lighting. Enhancements in energy efficiency are currently achieved through strategies to reduce artificial lighting by intelligent daylight utilization. Control strategies in the field of daylighting and artificial lighting are mostly rule-based and focus either on comfort aspects or energy objectives. This paper aims to provide an overview of published scientific literature on enhanced control strategies, in which new control approaches are critically analysed regarding the fulfilment of energy efficiency targets and comfort criteria simultaneously. For this purpose, subject-specific review articles from the period between 2015 and 2020 and their research sources from as far back as 1978 are analysed. Results show clearly that building controls increasingly need to address multiple trades to achieve a maximum improvement in user comfort and energy efficiency. User acceptance can be highlighted as a decisive factor in achieving targeted system efficiencies, which are highly determined by the ability of active user interaction in the automatic control system. The future trend is moving towards decentralized control concepts including appropriate occupancy detection and space zoning. Simulation-based controls and learning systems are identified as appropriate methods that can play a decisive role in reducing building energy demand through integral control concepts.

Effect of mutual radiative exchange between the surfaces of a street canyon on the building thermal energy demand

Energy ◽  
2021 ◽  
pp. 120346
Author(s):  
Gabriele Battista ◽  
Emanuele de Lieto Vollaro ◽  
Paweł Ocłoń ◽  
Andrea Vallati
Keyword(s):  
Thermal Energy ◽  
Street Canyon ◽  
Energy Demand ◽  
Radiative Exchange

scholarly journals Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

Environments ◽  
2018 ◽  
Vol 5 (11) ◽  
pp. 119 ◽  
Author(s):  
Alessia Arteconi ◽  
Luca Del Zotto ◽  
Roberto Tascioni ◽  
Khamid Mahkamov ◽  
Chris Underwood ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Energy Demand ◽  
Energy Use ◽  
Energy Savings ◽  
Organic Rankine Cycle ◽  
Cost Savings ◽  
Rankine Cycle ◽  
Primary Energy ◽  
Operational Cost ◽  
The North

In this paper, the smart management of buildings energy use by means of an innovative renewable micro-cogeneration system is investigated. The system consists of a concentrated linear Fresnel reflectors solar field coupled with a phase change material thermal energy storage tank and a 2 kWe/18 kWth organic Rankine cycle (ORC) system. The microsolar ORC was designed to supply both electricity and thermal energy demand to residential dwellings to reduce their primary energy use. In this analysis, the achievable energy and operational cost savings through the proposed plant with respect to traditional technologies (i.e., condensing boilers and electricity grid) were assessed by means of simulations. The influence of the climate and latitude of the installation was taken into account to assess the performance and the potential of such system across Europe and specifically in Spain, Italy, France, Germany, U.K., and Sweden. Results show that the proposed plant can satisfy about 80% of the overall energy demand of a 100 m2 dwelling in southern Europe, while the energy demand coverage drops to 34% in the worst scenario in northern Europe. The corresponding operational cost savings amount to 87% for a dwelling in the south and at 33% for one in the north.

scholarly journals Energy requirement of biomass gasifier model with special reference to odanthurai panchayat in coimbatore district

2011 ◽  
Vol 1 (1) ◽  
pp. 20-26
Author(s):  
PERIYASAMY P
Keyword(s):  
Rural Areas ◽  
Energy Demand ◽  
Crop Residues ◽  
Biomass Conversion ◽  
Energy Requirement ◽  
Co2 Emission Reduction ◽  
Rural People ◽  
Continuous Increase ◽  
Sustainable Solutions ◽  
Decentralized Energy

Energy is the driving force primarily associated with the economic and social development of a country. Energy serves as the building block of any industry or services, which in turn propel the economy of any nation. But energy at affordable price is the prime challenge which developing countries are facingtoday as a result of continuous increase in primary energy cost. Biomass such as wood, crop residues,agricultural residues. Forest waste, etc., are the oldest source of heat energy for domestic purposes. The energy requirement and end use of energy at rural areas are quite different from urban environment, whichare basic and essential amenities like lighting, water pumping and power for small industries dominate village energy requirements. Even now Coimbatore has rural and urban that need some form of energy other that gird electricity to light up the darkness, to improve its economy and to increase the livingstandards of the rural people. If Odanthurai Panchayat has to achieve its goal of becoming a leading electricity power in Coimbatore. The Odanthurai will have to find modern and renewable ways of producing energy to bridge the increasing gap between demand and supply for electricity supply. In recent years modern biomass conversion technologies have been developed which can convert biomass fuels into various energy forms. These technologies can play an important role in providing sustainable solutions for decentralized energy demand in villages and industries. The economic and environmental conditions of rural areas can be improved only by means of local empowerment and decentralized energy generation.Gasifier can play an important role in the upliftment of rural people as it serves the purpose of economic and environmental improvement. This shows that the substitution of petroleum products and CO2 emission reduction, power generation, assessment of the social impacts and economic viability. So the successful model of Odanthurai can be replicated anywhere to fulfill the energy and other essential needs of rural people.

A Geothermal Energy Concept based on Heat Storage in Geological Media

2021 ◽  
Author(s):  
Rubén Vidal ◽  
Maarten W. Saaltink ◽  
Sebastià Olivella
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Energy Demand ◽  
Ground Deformation ◽  
Hot Water ◽  
Energy Deficit ◽  
Good Tool ◽  
Aquifer Thermal Energy Storage ◽  
Low Efficiency

<p>Aquifer Thermal Energy Storage (ATES) can help to balance energy demand and supply to make better use of infrastructures and resources. ATES consists of a pair or more wells that simultaneously inject or extract thermal energy into aquifers. The aim of ATES is to store the excess of energy during summer and to reuse it during winter, when there is an energy deficit. High-temperature Aquifer Thermal Energy Storage (HT-ATES) provides a good option to store water over 50°C, but it requires facing some problems, such as low efficiency recoveries and the uplift of the surface. Coupled thermo-hydro-mechanical (THM) modelling is a good tool to analyze the viability and cost effectiveness of the HT-ATES systems and understand the interaction of processes, such as heat flux, groundwater flow and ground deformation. We present the 3D THM modelling of a pilot HT-ATES system, inspired by one of the projects of HEATSTORE, which is a GEOTHERMICA ERA-NET co-funded project. The model aims to simulate the injection of hot water of 90°C in a central well and the extraction of water in four auxiliary wells during summer. In winter, the auxiliary wells inject water of 50°C and the central well extract water. The loading lasts longer than the unloading (8 months versus 4 months) and overall more heat is injected than extracted. We found that the system is more efficient in terms of energy recovery, the more years the system is operating. In the aquifer, both thermal loads and hydraulic loads have an important role in terms of displacements. At the surface, the vertical displacements are only a consequence of the hydraulic strains generated by the injection of water in the aquifer.</p>

Analysis of Thermal Energy Storage to a Combined Heat and Power Plant

2021 ◽  
Vol 9 (9) ◽  
pp. 1313-1320
Author(s):  
Shahim Nisar
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Energy Demand ◽  
Power Plants ◽  
Heat Storage ◽  
Packed Bed ◽  
Water Tank ◽  
Latent Heat Storage ◽  
Storage Methods

Abstract: Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation. TES systems are used particularly in buildings and in industrial processes. This paper is focused on TES technologies that provide a way of valorizing solar heat and reducing the energy demand of buildings. The principles of several energy storage methods and calculation of storage capacities are described. Sensible heat storage technologies, including water tank, underground and packed-bed storage methods, are briefly reviewed. Additionally, latent-heat storage systems associated with phase-change materials for use in solar heating/cooling of buildings, solar water heating, heat-pump systems, and concentrating solar power plants as well as thermo-chemical storage are discussed. Finally, cool thermal energy storage is also briefly reviewed and outstanding information on the performance and costs of TES systems are included.

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