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Solar decathlon middle east competition house of team twist box Andrej Črnila, Aleksandra Sretenović, Stefan Milanović
The Solar House "Twist Box" is a project of the Belgrade University, run by the Faculty
of Architecture; School of Electrical Engineering; Faculty of Technology and Metallurgy
and Faculty of Mechanical Engineering.
This project has been launched for the purpose of the "Solar Decathlon Middle East"
competition and is now in the final stage in which the documentation for carrying out the
works is being prepared. Here we will be talking about the HVAC equipment that will be
designed for this building, the way they are selected and solutions that are developed in
order to reduce heat load. The first problem we encounter is location and climatic
conditions. The location where this house will be built in November 2018 is 30km from
Dubai UAE. Climatic conditions at this location are very unfavorable from the standpoint
of air conditioning because they represent a combination of very high temperatures and
intense solar radiation. In order to achieve comfort conditions inside the building, it is
necessary to provide the required amount of fresh air of the appropriate temperature. In
order to select an adequate system, it was first necessary to calculate the heat load based
on climatic influences, thearchitectural and construction model, the number of people
envisaged to be in premises, electrical installations and other factors. In addition to the
calculated heat flow, a simulation was performed that showed a more realistic picture
throughout the year. After calculating the heat load, equipment is selected for covering
the total heat load, which ensures the design temperature in the room and provides the
required amount of fresh air. The preparation of air-conditioned air is carried out using
a heat recovery, and high-static ducted indoor units. The heat recovery serves to cool the
fresh outside air at the expense of heating the waste air from the room. The high-static
ducted indoor unitsare supplied with the refrigerant from the outdoor unit. Prepared air
is supplied to the living space by means of supply air equipment which has been selected
so that it fits best into the interior, while ensuring sufficient levels of noise and, more
importantly, to provide an adequate air flow inside the space. The second task is the
preparation of domestic hot water, which is done by solar energy receiver. Space is
allocated on the roof for the solar energy receiver, and it is connected with the hot water
boiler inside the house.
Keywords: SDME; HVAC; Solar; Efficiency; Sustainability.
Aspecte privind propagarea zgomotului cauzat de curgerea aeraulică Aspects of noise propagation caused by aeraulic flow Carmen Mârza, Georgiana Corsiuc
Noțiunea de confort sau „starea de bine” reprezintă concepte care înglobează un cumul
de exigente ale indivizilor vis-a-vis de mediul în care își desfășoară activitatea. În
această lucrare, autoarele își propun o dezbatere privind confortul acustic în clădiri, mai
concret aspecte legate de propagarea zgomotelor în canalele de ventilare/climatizare și
măsurile care se impun pentru atenuarea acestora, chiar dacă valoarea presiunii
acustice datorată acestei cauze nu are valori extrem de mari.
Cuvinte cheie: confort acustic, surse de zgomot, curgere aeraulică, atenuare zgomote.
The terms of comfort and "well-being" are concepts that includes a cumulus of people
requirements regarding the environment in which they operate. In this paper, the authors
propose a debate on acoustic comfort in buildings, more specifically aspects of the
propagation of noise in the ventilation / air conditioning ducts and the measures required
to attenuate them, even if the value of the acoustic pressure due to this cause has no
extreme values.
Keywords: acoustic comfort, noise sources, aeraulic flow, noise attenuation.
Sistem sursa utilizand energia solara si pompa de caldura pentru incalzirea unei cladiri. Analiza energetica Source system using solar energy and heat pump to heat a building. Energy analysis prof. dr. Ing. Florin Iordache, drd. ing. Mugurel Talpiga
Lucrarea de fata urmareste analiza energetica a unui sistem neconventional compus
dintr-o bucla de captare a energiei solare legata in paralel cu o pompa de caldura,
ambele pompand puteri termice care se insumeaza in contul agentului termic vehiculat in
instalatia de incalzire centrala a unei cladiri. In lucrare se prezinta procedura de
evaluare a performantelor energetice ale acestui sistem utilizand energia solara si
energia mediului exterior si se realizeaza o aplicatie pe un studiu de caz. Rezultatele sunt
prezentate tabelar si grafic in cateva diagrame. In final se fac aprecieri asupra
parametrilor importanti capabili sa conduca la cresterea performantelor energetice
aferente acestor tipuri de sisteme de utilizare a surselor regenerabile.
Cuvinte cheie: energie solara, pompe de caldura, surse regenerabile
The present paper follows the energy analysis of an unconventional system consisting of
a solar energy capture loop connected in parallel with a heat pump, both pumping
thermal energies that are summed up in the account of the thermal agent circulated in the
central heating installation of a building. The paper presents the procedure for assessing
the energy performance of this system using solar energy and the energy of the external
environment, and an application is made on a case study. The results are presented
tabularly and graphically in some diagrams. Finally, we assess the important parameters
able to increase the energy performance of these types of systems for the use of renewable
sources.
Keywords: solar energy, heat pumps, renewable sources
Numerical thermal analysis of wall structure of a sustainable building Mykola Savytskyi, Babenko Maryna, Berezyuk Anatoliy, Kuzmenko Oleksandra
The straw-wooden panel became an integral part of eco-building in the 21st
century. Combined with wooden frame, interior and exterior protective layers, this
technology allows to achieve passive house and nearly zero energy standard. This paper
represents the numerical analysis of simplified fragments of straw-wooden panel in two
variants: with and without accumulation layer and heating. The obtained data will be
compared with the next investigations concerning the detailed structure with wooden
frame and expected thermal bridges.
Keywords: straw-wooden panels, insulation, numerical analysis, housing construction,
green building, sustainable development in constructions
Impactul performanțelor elementelor de anvelopă vitrate asupra performanțelor energetice ale clădirii, confortului (thermic & luminos) și calității mediului interior Impact of vitreous tire performance on the energy performance of the building, comfort (thermal & light) and indoor environment Conf. dr. ing. Victoria COTOROBAI, Lec. S. Iulia NEGARĂ, conf. dr. ing. Silviana BRATA, I.C. COTOROBAI
Impunerea unor noi exigențe pentru clădirile viitorului (NZBE, și altele) necesită
instrumente de concepere mult mai puternice și eficiente în raport cu instrumentele
uzuale care să permită previzionarea comportamentului dinamic al acestora în condiții
climatice specifice amplasamentului, în contextul vecinătăților și care să poată oferi un
climat și o calitate a mediului interior adecvat cu cerințele ocupanților. În lucrare se
prezintă rezultatele unui studiu de caz care a vizat configurarea optimă a elementelor de
construcție exterioare vitrate, în condiții climatice dinamice, pentru clădirile noi și îmbunătățirea elementelor de construcție existente pentru a realiza anvelopa clădirilor
NZEB. Avantajul instrumentului utilizat constă în posibilitatea utilizării celor mai recente
modele de comportament dinamic a elementelor vitrate, care pot simula transferul de
lumină și energie, dinspre exterior spre interior și invers, cu diferite structurări (diferite
sticle: clasice, clare, inteligente, cu PV integrate, cu control solar...; număr de geamuri
cuplate diferite, cu cavitate cu gaze diferite; tâmplărie din materiale și cu dimensiuni
diferite; sisteme de umbrire asociate sau integrate), în condiții climatice standard sau în
condiții climatice reale. S-a vizat și studiul impactului sistemelor vitrate asupra
confortului energetic și vizual. S-a vizat și studiul impactului sistemelor vitrate asupra
confortului energetic și vizual. S-a constatat: a) la sistemele vitrate clasice cu 2 și 3 sticle
clare s-a constatat: o puternică dinamică a temperaturii pe suprafața internă a geamului,
respectiv efectul radiației reci/calde din partea geamului; efectul de orbire în anumite
momente din zi și an; efectul de seră în cavitatea dintre geamuri; b)pentru geamurile
termopan un efect pozitiv pe perioada iernii și unul negativ pe perioada verii; c) Pentru
geamuri speciale recente s-a constatat posibilitatea controlului luminii vizibile și a
energiei transmise exterior-interior și invers.
Cuvinte cheie: elemente de anvelopă vitrate, performanță energetică, confort termic,
calitatea mediului interior
The imposition of new requirements for future buildings (NZBEs and others) requires
much more powerful and effective design tools than usual tools to predict their dynamic
behavior in climatic conditions specific to amplitude in the context of neighborhoods and
to provide a climate and a quality indoor environment appropriate to occupant
requirements. The paper presents the results of a case study that aimed at optimal
configuration of vitreous exterior construction elements in dynamic climatic conditions to
achieve the NZEB building envelope. The advantage of the instrument used is the
possibility of using the latest models of dynamic behavior of the glazed elements, which
can simulate light and energy transfer from the outside to the inside and vice versa with
different structures (different glasses: classical, clear, intelligent, integrated PV , solar
control ...; number of different coupled windows, different gas cavities, associated or
integrated shading systems) under standard climate or real climate conditions. The study
also focused on the impact of glazed systems on energy and visual comfort. The classic
glazed systems with 2 and 3 clear glasses found: a strong dynamics of the temperature on
the internal surface of the glass, respectively the effect of cold / warm radiation from the
window; the blindness effect at certain times of the day and year; the greenhouse effect in
the window cavity; a positive effect during the winter and a negative one during the
summer. For recent special glasses it was possible to control the visible light and the
energy transmitted externally-inside and vice versa.
Keywords: vitreous tire elements, energy performance, thermal comfort, indoor
environment quality
Sisteme de ventilație și climatizare - Grinzi de răcire vs. Ventiloconvectoare - Ventilation and air conditioning systems - Cooling Beams vs. Ventilation Convectors - MD stud. Raul GIRCSIS, MD stud. Ionuț Vasile NICORAȘ
Lucrarea prezintă un studiu comparativ între un sistem de ventilare și climatizare
compus din grinzi de răcire și un sistem compus din ventiloconvectoare, privind
avantajele și dezavantajele celor două soluții, precum și o valoare pentru „life cycle
cost” pentru fiecare soluție în parte.
Cuvinte cheie: instalații HVAC, grinzi de răcire, ventiloconvectoare, life cycle cost.
The paper presents a comparative study between a ventilation and air conditioning
system consisting of cooling beams and a system composed of fan coils, regarding the
advantages and disadvantages of the two solutions, as well as the value for the "life cycle
cost" for each solution.
Keywords: HVAC installations, cooling beams, fan coils, life cycle cost.
Modelare functionala si energetica a unui sistem compus din pompa de caldura, instalatie de incalzire centrala si cladire Functional and energetic modeling of a system consisting of a heat pump, a central heating installation and a building prof. dr .ing. Florin Iordache, drd. ing. Mugurel Talpiga
Lucrarea are ca obiectiv principal efectuarea unei analize energetice privind utilizarea
unei pompe de caldura pentru incalzirea agentului termic vehiculat in cadrul instalatiei
de incalzire centrala a unei cladiri. S-au considerat 2 tipuri de pompe de caldura cu
compresie mecanica si anume una tip apa-apa si alta tip aer-apa. Instalatia de incalzire
centrala s-a considerat de tip de joasa temperatura.
In lucrare se prezinta pe scurt relatiile care au stat la baza realizarii analizei energetice
pe perioada sezonului rece al anului. Rezultatele energetice si functionale sunt prezentate
tabelar si grafic astfel incat sa rezulte destul de usor performantele pompei de caldura.
In perioadele de solicitare climatica intense ale cladirii intra in functiune si o centrala
termica pe combustibil gazos, acoperindu-se astfel varfurile de sarcina ale
consumatorului.
Cuvinte cheie: surse regenerabile, pompe de caldura, casa cu economie de energie
This paper review the energetic analyze of two different heat pumps, used to prepare the
primary thermal agent of a building heating system. Two types of heat pump with
mechanical compression were simulated, the chosen types being water to water and air to
water. The building heating system consist of a low temperature.
In brief, the basic mathematical equations are presented, to be used in energetic analyze
for cold season when heating is required for inside thermal comfort. The results,
functional and energetic, are presented in tables also graphical, to be easy seen the heatpumps
performances. For critical temperatures, also a classical heating system, to cover
the entire heating demand in those periods.
Keywords: renewable sources, heat pumps, building with energy saving
Designing the “mind the gap” project – investigating the difference, in performance, between design and the building “in-use” Dr. Andy Lewry, Ms. Lorna Hamilton, Mrs. Mindy Hadi, Mr. Jaie Bennett, Dr. Richard Peters
We have the ability to design good buildings and the knowledge to operate
them in an effective and efficient manner – so why doesn’t it happen?
The “Mind the Gap” project intends to collect evidence from exemplar office buildings
with a range of performance; investigate the reasons for their performance; determine
the underpinning causes; and then present practical solutions to solve any
underperformance.
The first phase will to produce a methodology based on the learnings from the trial
buildings. This will be streamlined with the process then rolled out in a second phase
over a larger number of buildings to produce a statistically significant sample which
covers office buildings with a full range of servicing and age.
This paper:
- Introduces the performance gap.
- Describes the “Mind the Gap” project and its methodology.
- Presents some initial data and findings.
Keywords: Performance gap; Asset performance; Operational performance
The value of sustainability Dr. Andy Lewry, Mr James Fisher, Mr Matt Holden
As the market place becomes increasingly competitive and there is a need to be able to
differentiate oneself as a high performer. From Andrew Vaughan the CEO of Redevco
‘Greening our portfolio over the next two years is not only environmentally the right
thing to do, it also makes sound business sense.’ One of the barriers to this is the result
of split responsibilities within the real estate sector.
Buildings built and/or managed to sustainability standards, such as BREEAM have been
shown to minimise risk and generate maximum profit via:
• High and continuous rental income;
• Low operating & maintenance cost;
• Low depreciation.
Through certification and verification all parties can be confident in:
• The performance of assets and portfolios;
• It allows comparability across building types and countries;
• The analysis is based on sound science and standards;
• Allows you to be one step ahead of legislation and industry best practices.
The UK RICS Valuation Sustainability Working Group do not think we are paying a
premier for green buildings but having to give a discount because the building is not
performing well.
This paper presents the business case and value gained by being sustainable and how
certification gives credibility to process and performance of portfolios and buildings.
Keywords: Sustainability; value case; Asset management; Asset performance;
Operational performance
Influenţa confortului termic şi a calitaţii aerului asupra randamentului sportivilor în spaţii închise Influence of thermal comfort and air quality on performance of athletes in enclosed spaces Ş. l. dr. ing. Marius ADAM, Conf. univ.dr. ing. Olga BANCEA, Conf. univ.dr. ing. Adriana TOKAR, Ş. l. dr. ing. Cristian PĂCURAR
Lucrarea prezintă un studiu de caz în care s-au măsurat parametrii aerului interior într-o
sală de sport şi s-a determinat influenţa acestora asupra performanţelor sportive ale
participanţiilor.
Cuvinte cheie: confort termic, calitatea aerului, randament sportivi, săli de sport.
The paper presents a case study in which the parameters of the indoor air were measured
in a sports hall and was determined their influence on the sport performances of the
participants.
Keywords: thermal comfort, air quality, sports performance, sports halls
Domestic hot water - cost effective legionella treatment. Perfect comfort and hygiene Drd. Ing. Szilveszter GEYER EHRENBERG, Prof. Dr. Ing. Adrian RETEZAN
Folosim Apa Caldă Menajeră în mod constant, zilnic, pentru a asigura nivelul general de
igienă. Cu toate acestea, doar rareori ne preocupă cât de igienică este Apa Caldă
Menajeră, și dacă ne ajută realmente. În timp ce căutăm soluții de economisire,
asigurarea unui confort ambiental, se mai întâmplă să ignorăm aspectele de sănătate
generală. Igienizarea ACM este un subiect de actualitate având în vedere tendințele de
utilizare a soluțiilor de încălzire cu temperaturi reduse. Lucrarea abordează calitatea
ACM prin două metodologii, dezinfecția termică și dezinfecția chimică precum și
costurile aferente.
Cuvinte cheie: Economisirea de energie, Comfort, Apă caldă menajeră, Igienă,
Legionella.
We use Domestic Hot Water on daily base, for personal and general hygiene. However,
we rarely consider if the DHW is clean enough and if it serves us in a positive way.
Looking forward for energy savings, sometimes we may overlook health aspects while we
are focusing on low running costs and comfort level. Treating DHW is more and more
actual subject, as we apply for low temperature heat sources. The paper is looking to
make a comparison between heat- and chemical treatment of DHW and cost related
issues.
Keywords: Energy Savings, Comfort, Domestic Hot Water, Hygiene, Legionella.
Sistem de climatizare utilizand energia solara. Analiza energetica Air conditioning using solar energy. Energy analysis Prof. dr. ing. Florin Iordache
Lucrarea are ca obiectiv analiza energetica a unui sistem neconventional de utilizare a
unei surse regenerabile (energia solara) in scopul climatizarii spatiilor unei cladiri in
perioada sezonului cald al anului. Sistemul sursa considerat are o component
neconventionala, reprezentata de instalatia de captare a energie solare si o componenta
clasica reprezentata de o centrala termica, ambele preparand un agent termic
furnizat unei masini frigorifice de preparare a apei reci.
In lucrare se descrie pe scurt procedura de evaluare a puterilor termice furnizate de
sistemul neconventional si de sistemul clasic unei cladiri pentru care se stabileste
necesarul de frig.
Pe studiul de caz concret considerat se prezinta tabelar si grafic atat performantele
energetice ale sistemului cat si gradul de acoperire energetica oferit consumatorului
deservit
Cuvinte cheie: energie solara, chiller cu absorbtie, climatizarea cladirilor
The paper aims at the energy analysis of an unconventional system of using a renewable
source (solar energy) in order to air conditioning of a building during the warm season of
the year. The considered source system has an unconventional component, represented by
the solar energy system and a classic component represented by a thermal plant, both
preparing a thermal agent supplied to a chiller with absorbtion.
The paper briefly describes the procedure for assessing the thermal powers provided
by the unconventional system and the classical system to a building for which the demands
cold is established.
On the concrete case study, the table shows both the energy performance of the
system and the degree of energy coverage offered to the serviced customer
Keywords: solar energy, absorbtion chiller, building, air conditioning of the building
Performanța energetică a unei pompe de căldură aer-apă alimentată de la un sistem de panouri fotovoltaice de tip off-grid The energy performance of an air-to-water heat pump powered by an offgrid photovoltaic panel system Ș.l.dr.ing. Călin SEBARCHIEVICI, Prof.dr.ing.eur.ing. Ioan SÂRBU
Energia consumată pentru prepararea apei de consum are o importanţă deosebită atunci
când se doreşte evaluarea consumurilor energetice din clădiri. Lucrarea prezintă
rezultatele cercetărilor experimentale în scopul determinării performanţelor pentru o
pompă de căldură aer-apă, alimentată cu energia electrică produsă de panourile solare
fotovoltaice în diferite scenarii de preparare a apei calde de consum. Utilizarea
panourilor fotovoltaice conduce la o reducere considerabilă a consumurilor energetice în
clădirile de locuit o importantă sursă de energie regenerabilă şi anume soarele. Luând în
considerare diferitele temperaturi de preparare a apei calde de consum pompa de
căldură va avea diferite performațe energetice reliefate prin măsurători experimentale.
Utilizând panourile fotovoltaice la alimentarea cu energie electrică a pompei de căldură,
se poate afirma că aceste siteme solare de producere a energiei electrice au un aport
important în reducerea consumurilor energetice ale clădirilor şi în asigurarea unui
confort ridicat.
Cuvinte cheie: panouri fotovoltaice , energie
Energy consumption for domestic hot-water production is particularly important when is
wanted to assess the energy consumption in buildings. The paper presents the results of
the experimental researches in order to determine the performance of an air-water heat
pump, feeded by the electric energy produced by the photovoltaic solar panels in various
scenarios for the preparation of hot water. Using photovoltaic panels leads to a
significant reduction in energy consumption in residential buildings, an important source
of renewable energy, namely the sun. Taking into account the different hot water cooking
temperatures, the heat pump will have different energy performances highlighted by the
exeperimental measurements.
Using photovoltaic panels to heat pump power, it can be said that these solar power
plants have an important contribution to reducing the energy consumption of buildings
and ensuring high comfort.
Keywords: photovoltaic panels, energy
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