Spelling suggestions: "subject:"cooling atemsystem"" "subject:"cooling systsystem""
61 |
Sistema de ventilação com nebulização no frigorífico sobre o microclima do veículo transportador, respostas fisiológicas e comportamentais de suínos / Ventilation system with water misting at the commercial slaughter plant on truck microclimate, physiological and behavior response of pigsThuanny Lúcia Pereira 25 January 2018 (has links)
Objetivou-se avaliar a efetividade da ventilação forçada associada à nebulização sobre as respostas comportamentais e fisiológicas de suínos mantidos dentro do veículo transportador antes do descarregamento na indústria frigorífica. Durante 6 semanas de transporte, 2 veículos pot-belly (PB) transportaram 191 suínos cada até a mesma planta frigorífica. Na chegada, ambos veículos permaneceram estacionados por 30 minutos antes da descarga. Um dos veículos PB foi posicionado ao lado do sistema de ventilação e nebulização (PBVM), enquanto o outro PB não teve acesso ao sistema de resfriamento (PBC). O tratamento (PBVM) consistiu em 10 minutos de ventilação (Espera 1); seguido de 10 minutos de ventilação e nebulização (Espera 2) e 10 minutos finais de ventilação (Espera 3). A temperatura do ar (T) e a umidade relativa (RH) foram monitorados. A frequência de suínos deitados e a frequência de acesso ao bebedouro foram calculadas. Temperaturas do trato gastrointestinal (GTT), lactato sanguíneo, hematócrito, creatina quinase e concentrações de cortisol foram avaliados. Durante a Espera 1, a ventilação forçada reduziu a temperatura do ar e o índice de temperatura e umidade no tratamento PBVM. Na Espera 3, a temperatura e o índice de temperatura e umidade foram menores (P < 0.001) no tratamento PBVM comparado ao PBC, contudo a umidade relativa do ar foi maior (P < 0.001). Suínos oriundos do compartimento 4 do PBVM apresentaram maior atividade durante o tempo de Espera 2 e 3, e reduzido tempo de latência para se deitar na baia do frigorífico (P < 0.05). Redução no GTT dos suínos oriundos do PBC foi observada após 1 hora de período de descanso comparada ao PBVM. O percentual de hematócrito tendeu a ser maior nos suínos PBC comparado ao PBVM. O sistema de ventilação e nebulização utilizado na indústria frigorifica antes do descarregamento melhora de forma eficiente as condições internas térmicas do caminhão e consequentemente o conforto térmico dos suínos mantidos no veículo transportador, com redução na temperatura dentro dos compartimento e baixo nível de desidratação no abate. / The aim of this study was to evaluate the effectiveness of water misting with forced ventilation on a stationary trailer on internal vehicle ambient conditions, behavioral and physiological response of market pigs. During 6 weekly shipments, two identical tri-axle pot-belly (PB) trailers transported 191 pigs each (126 ± 5 kg BW) to the same slaughter plant. On arrival, both trailers were kept stationary in the yard for 30 min before unloading. One PB trailer was pulled over along a fan-misters bank (PBVM), while the other PB trailer had no access to this cooling system (PBC). The PBVM treatment consisted in 10 min of fan-assisted ventilation (wait 1) followed by 10 min of ventilation and water misting (wait 2) and final 10 min of ventilation (wait 3). The air temperature (T) and relative humidity (RH) were monitored. The frequency of lying pigs, the latency to rest and the frequency of drinking bouts were calculated. Gastrointestinal tract temperature (GTT) and exsanguination blood lactate, hematocrit, creatine kinase and cortisol concentrations were assessed. In wait 1, the application of the fan-assisted ventilation resulted in lower (P < 0.05) T and THI in the PBVM. In wait 3, T and THI were still lower (P < 0.001) in PBVM compared to PBC, but the RH was higher (P < 0.001). Pigs from compartment 4 of PBVM had a greater (P < 0.001) activity during waits 2 and 3, and a reduced latency to lie down in the lairage pen compared to the same compartment in the PBC (P < 0.05). A higher (P < 0.05) GTT drop was recorded until 1 h after lairage in pigs located in PBC compared to those transported in PBVM. At slaughter, hematocrit tended to be higher (P = 0.08) in blood of PBC pigs compared to PBVM. The fan-misters bank used on the PBVM vehicle sitting at the slaughter plant before unloading efficiently improves internal trailer thermal conditions and consequently thermal comfort of pigs kept in a stationary trailer, with reduced temperature within the compartments and lower dehydration condition at slaughter.
|
62 |
Návrh větrání a chlazení v multifunkční budově se zubními ordinacemi / Ventilation and air-conditioning in a mixed-use building with dental officesTruksa, Ondřej January 2018 (has links)
The aim of the master’s thesis was to design ventilation and cooling systems in a three-storey mixed-use building, which contained three apartments and two dentists’ surgeries. Two independent ventilation systems were designed in the building, with respect to different purposes of the indoor spaces. The mechanical cooling system was proposed in some of the rooms to improve thermal comfort in summer. The thesis includes calculations of building heat gains, heat losses, air exchange rates and the dimensioning of the ventilation and cooling systems. The thesis also comprises design calculations and technical drawing.
|
63 |
Chlazení výkonných zdrojů světla / Cooling of a powerful light sourceTulis, Vojtěch January 2018 (has links)
The diploma thesis is focused on calculating the thermal resistance of the line light source and the design of the cooling system with ideal inlet temperature. The partial aim of the work is in cooperation with CAMEA spol. s r. o. to determine the thermal resistances of the individual parts of the device and propose modifications so that the total thermal resistance and the maximum temperature are within the limits given by the cooperating firm. The main objective is to design a cooling system with all safety features and recommended regulation for economical and reliable operation. Analytical calculations, CFD simulations and real-world testing are used to determine the desired results. A reduction by 30% in thermal resistance of the printed circuit board was achieved, the thermal resistance of the aluminum profile with the cooling channel was determined and its hydraulic properties were calculated. The current cooling system designed by CAMEA spol. s r. o. for less powerful diodes was verified for use in a more powerful system, and a new cooling system was designed for efficient and economical operation in a powerful diode system.
|
64 |
Návrh individuálního větrání bytu s rekuperací tepla / Individual ventilation system with recuperationHrabánek, Radek January 2012 (has links)
The diploma thesis is consisting of theoretic part, which deals with used ventilating systems, describes basic types of air-conditioning systems and basic characteristics and diversification of radiant cooling systems. Following part attend to design of ventilating system and radiant cooling system for cooling of the flat. Design of the ventilation systém is based on minimum air flow per person. Design of the radiant cooling system is based on calculation of thermal loads. Design documentation is part of the diploma thesis as well as the calculations made in excel.
|
65 |
Life Cycle Assessment of a High-Density Datacenter Cooling System: TeliaSonera’s ‘Green Room’ ConceptBitencourt de Oliveira, Felipe January 2012 (has links)
The increasingly power load of datacenters worldwide and consequently, the increase on heat dissipation by electronic components, have been highlighting the importance of efficiently designing cooling solutions for such systems. In fact, bad management of the cooling system can greatly increase the total electricity consumption in a datacenter. This being said, TeliaSonera in order to decrease the total electricity consumption in its datacenters, has developed a new cooling solution known as the Green Room concept. Therefore in order to evaluate the potential environmental benefits related to this product, this work was developed. The Life Cycle Assessment methodology in accordance to ISO 14040/43 standards was applied to assess its environmental performance, from cradle-to-grave. Moreover the software SimaPro, the Ecoinvent database and the ReCiPe impact assessment method were also utilized. The results emphasized the phases and activities during Green Room life cycle presenting the highest potential impacts. This being said, the utilization phase presented for every impact category analyzed the highest potential impacts, with exception of ozone depletion category, which was dominated by material extraction and manufacturing phase, due to the presence of R134a refrigerant. In addition transportation phase presented the lowest values for every category and the end of life phase exposed considerable impact mitigation for the whole life cycle. Moreover extraction and manufacturing phases presented copper, steel and the refrigerant R134a as the most impacting materials for damage to human health, damage to ecosystems and damage to resources, respectively. Finally, improvements were proposed in order to increase the environmental performance of this cooling system.
|
66 |
Kylanläggning för småskalig ölproduktion anpassad för jäsning och lagring av lageröl / Cooling System for Small Scale Beer Production Adopted for Fermentation and Lagering of Lager BeerBOOG RUDBERG, SUSANN January 2015 (has links)
Antalet mikrobryggerier runt om i Sverige har de senaste åren ökat markant. Vanligast är att dessa producerar öl som ale och stout trots att vi svenskar, om man ser till systembolagets statistik, fortfarande främst dricker lager. En anledning till få av de mindre mikrobryggerierna brygger lageröl är att bryggprocessen är mer avancerad för att brygga lager. För att brygga lager krävs, utöver den vanliga bryggutrustningen, också ett sätt att kyla ölet på först till 10°C och sedan till 0°C under en längre period. Den utrustning som används av de flesta större mikrobryggerierna är för dyr för de mindre mikrobryggerierna och bryggning av lageröl uteblir därför ofta. Ett exempel på ett mindre mikrobryggeri som har detta problem är Brewing Költur och detta arbete har haft som avsikt att lösa kylproblemet för dem. Arbetet gick ut på att ta fram ett alternativt sätt, dels att kyla en sats öl på, 300 liter, dels att hålla ölet kallt utan större fluktuationer under en längre tid. En viktig del i lösningen är att investeringskostnaden för kylanläggningen skulle vara avsevärt lägre än de alternativ som finns på marknaden idag. Projektet hade dock inte som avsikt att lösa övriga problem som finns med bryggning av lager. Resultatet blev en Bag-in-Box: en frysbox i vilken en engångspåse placerades. En luftspalt skapades mellan påsen och frysens innerkanter för att sakta ner värmeöverföringen och på så vid undvika att kyla ned jästen för snabbt vilket (annars) kan få allvarliga konsekvenser på ölet. En prototyp av produkten kylanläggningen byggdes ihop på vilken tester utfördes. Testerna visade att produkten utan problem kunde hålla stabila temperaturer under längre perioder, framförallt vid de lägre temperaturerna. Vid nedkylning från 10°C samt vid hållning av denna temperatur krävdes viss komplettering med manuell omrörning för att undvika stora temperaturgradienter i påsen. Investeringskostnaden för produkten är mycket låg medan de rörliga kostnaderna är relativt höga på grund av engångspåsen då det går åt en eller två sådana per sats bryggd öl. På grund av produktens låga investeringskostnad, enkla montering samt relativt goda förmåga att hålla temperaturer konstanta anses produkten ha potential att kunna ha stor betydelse för mindre mikrobryggerier i framtiden. / There has been a large increase of microbreweries in Sweden in the past few years, most of which produce great beers such as ales and stouts. This is however a bit strange since most Swedes seem to prefer to drink lager; at least if you study the statistics of the Swedish alcohol monopoly’s top hundred most drunken beers last year. There might be several reasons for microbreweries not brewing lagers but one reason is the equipment needed for lager brewing. Apart from the regular brewing equipment needed for brewing ales, a cooling system is needed in lager brewing in order to reach the ideal temperatures for fermentation, 10°°C, and lagering. Lagering is a process where beer is stored for weeks or months in a cold place, typically around 0°C. The cooling systems on the market are expensive and small start-up microbreweries do not have the funds to purchase these. One example of such a microbrewery is Brewing Költur, and this study aims to solve the cooling problem for them. The goal was to design a cheaper alternative for cooling a 300-litre batch of beer but without severe changes in quality. The product needs to be able to hold stable temperatures and also lower the temperatures from 10°°C to 0°°C, both without major fluctuations in temperature within the vessel. The project did not aim at solving other lager brewing related problems. The result was a Bag-in-Box: a chest freezer in which a disposable plastic bag, big enough to fit 300 litres of beer, was placed. An air gap was created in between the inside walls of the freezer and the bag to keep the sudden cold walls from damaging the yeast by cooling it to quickly. A prototype was put together in order to test the most important features of the product. The tests showed that the product could keep stable temperatures very well in the lower temperature intervals, while it needed manual stirring in the higher regions to avoid temperature gradients, especially when the temperature was lowered. The cost of the product is overall very low. The investment cost is very low, however since the disposable bags are somewhat costly the variable cost is fairly high, yet still significantly cheaper than the alternatives on the market. It is believed that the product could be used by many smaller microbreweries in the future due to the low investment cost, its ability to keep the temperatures relatively stable and also because it is easy to assemble.
|
67 |
Improved Thermoregulation Of Brain Temperature Using Phase Change Material-Mediated Head Cooling SystemRakkimuthu, Sathyaprabha January 2020 (has links)
No description available.
|
68 |
Improving Energy Efficiency of School Buildings with Solar-Assisted Cooling for the MaldivesFathhee, Ahmed 09 August 2023 (has links) (PDF)
Anthropogenic activities are responsible for the impact of global climate change because of burning fossil fuels releasing harmful gases into the environment. As a result, the global temperature has risen about 1.18 °C since 1880, causing the global sea level to rise by 178 mm over the past century. This is a threat to countries that are closer to the ocean, especially the low-lying countries such as the Maldives. It is predicted if the sea level keeps rising, most of these islands could be below sea level by 2030.
The Maldives has a tropical climate requiring cooling to achieve thermal comfort. Electricity is used to provide cooling which is generated by burning fossil fuels. Due to the need for more buildings and the effects of global warming, the demand for cooling has increased, ultimately increasing the emissions.
Therefore, this paper investigated the methods to minimize the building cooling demand by creating a building model of a school in Feydhoo, Addu City, Maldives using DesignBuilder software. Also, to analyze the potential of using solar technology in providing cooling for the building, a clean energy source reducing emissions. The base model of the building showed that annual electricity consumption for cooling would be about 200.14 MWh. Based on the base model, multiple building models were created to understand the best option that can lower the cooling demand of the building. The results showed that having a super-insulated timber construction could be a better option by using improved double-glazed low-E windows and an improved cooling system with a COP of 3.2. This lowered the cooling energy demand to about 103.71 MWh.
Based on these results, a solar thermal cooling system was simulated using Polysun software which shows that solar thermal collectors were not able to provide the required cooling to run the chiller system. Hence, another option was explored where DesignBuilder software was used to model a solar PV array system to provide cooling for the building. But by using a better air conditioning system (VRF system coupled with a DOAS) to provide fresh conditioned air into the building, improving the indoor air quality. The results showed that the new PV array system was able to provide the electricity required not for cooling but for other electrical requirements (total of 163.31 MWh). It also resulted in a surplus of 1 MWh of electricity exported to the utility grid, achieving a net-positive energy building.
|
69 |
Development of model for large-bore engine cooling systemsKendrick, Clint Edward January 1900 (has links)
Master of Science / Department of Mechanical and Nuclear Engineering / Kirby S. Chapman / The purpose of this thesis is to present on the development and results of the cooling
system logic tree and model developed as part of the Pipeline Research Council International,
Inc (PRCI) funded project at the Kansas State National Gas Machinery Laboratory. PRCI noticed
that many of the legacy engines utilized in the natural gas transmission industry were plagued by
cooling system problems.
As such, a need existed to better understand the heat transfer mechanisms from the
combusting gases to the cooling water, and then from the cooling water to the environment. To
meet this need, a logic tree was developed to provide guidance on how to balance and identify
problems within the cooling system and schedule appropriate maintenance.
Utilizing information taken from OEM operating guides, a cooling system model was
developed to supplement the logic tree in providing further guidance and understanding of
cooling system operation. The cooling system model calculates the heat loads experienced within
the engine cooling system, the pressures within the system, and the temperatures exiting the
cooling equipment. The cooling system engineering model was developed based upon the fluid
dynamics, thermodynamics, and heat transfer experienced by the coolant within the system. The
inputs of the model are familiar to the operating companies and include the characteristics of the
engine and coolant piping system, coolant chemistry, and engine oil system characteristics.
Included in the model are the various components that collectively comprise the engine cooling
system, including the water cooling pump, aftercooler, surge tank, fin-fan units, and oil cooler.
The results of the Excel-based model were then compared to available field data to
determine the validity of the model. The cooling system model was then used to conduct a
parametric investigation of various operating conditions including part vs. full load and engine
speed, turbocharger performance, and changes in ambient conditions. The results of this
parametric investigation are summarized as charts and tables that are presented as part of this
thesis.
|
70 |
Modelling of a passive reactor cavity cooling system (RCCS) for a nuclear reactor core subject to environmental changes and the optimisation of the RCCS radiation heat shield heat shieldVerwey, Aldo 03 1900 (has links)
Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: A reactor cavity cooling system (RCCS) is used in the PBMR to protect the concrete
citadel surrounding the reactor from direct nuclear radiation impingement and heat. The
speci ed maximum operating temperature of the concrete structure is 65 ±C for normal
operating conditions and 125 ±C for emergency shut-down conditions. A conceptual design
of an entirely passive RCCS suitable for the PBMR was done by using closed loop
thermosyphon heat pipes (CLTHPs) to remove heat from a radiation heat shield over a
horizontal distance to an annular cooling dam placed around the PBMR. The radiation
shield is placed in the air space between the Reactor Pressure Vessel (RPV) and the concrete
citadel, 180 mm from the concrete citadel.
A theoretical heat transfer model of the RCCS was created. The theoretical model
was used to develop a computer program to simulate the transient RCCS response during
normal reactor operation, when the RCCS must remove the excess generated heat from
the reactor cavity and during emergency shut-down conditions, when the RCCS must remove
the decay heat from the reactor cavity. The main purpose of the theoretical model
is to predict the surface temperature of the concrete citadel for di erent heat generation
modes in the reactor core and ambient conditions.
The theoretical model assumes a 1D geometry of the RCCS. Heat transfer by both
radiation and convection from the RPV to the radiation heat shield (HS) is calculated.
The heat shield is modelled as a n. The n e ciency was determined with the experimental
work. Conduction through the n is considered in the horizontal direction only.
The concrete structure surface is heated by radiation from the outer surface of the heat
shield as well as by convection heat transfer from the air between the heat shield and
the concrete structure surface. The modelling of the natural convection closed loop thermosyphon
heat pipes in the RCCS is done by using the Boussinesq approximation and
the homogeneous ow model. An experiment was built to verify the theoretical model. The experiment is a full
scale model of the PBMR in the horizontal, or main heat transfer, direction, but is only
a 2 m high section. The experiments showed that the convection heat transfer between
the RPV and the HS cannot be modelled with simple natural convection theory. A Nusselt
number correlation developed especially for natural convection in enclosed rectangles
found in literature was used to model the convection heat transfer. The Nusselt number
was approximately 3 times higher than that which classic convection theory suggested.
An optimisation procedure was developed where 121 di erent combinations of n sizes
and heat pipe sizes could be used to construct a RCCS once a cooling dam size was chosen.
The purpose of the optimisation was to nd the RCCS with the lowest total mass.
A cooling dam with a diameter of 50 m was chosen. The optimal RCCS radiation heat
shield that operates with the working uid only in single phase has 243 closed loop thermosyphon
heat pipes constructed from 62.72 mm ID pipes and 25 mm wide atbar ns.
The total mass of the single phase RCCS is 225 tons. The maximum concrete structure
temperature is 62.5 ±C under normal operating conditions, 65.8 ±C during a PLOFC emergency
shut-down condition and 80.9 ±C during a DLOFC emergency shut-down condition.
In the case where one CLTHP fails and the adjacent two must compensate for the loss of
cooling capacity, the maximum concrete structure temperature for a DLOFC emergency
shut-down will be 87.4 ±C. This is 37.6 ±C below the speci ed maximum temperature of
125 ±C. The RCCS design is further improved when boiling of the working uid is induced
in the CLTHP. The optimal RCCS radiation heat shield that operates with the working
uid in a liquid-vapour mixture, or two phase ow, has 338 closed loop thermosyphon
heat pipes constructed from 38.1 mm ID pipes and 20 mm wide atbar ns. The total
mass of the two phase RCCS is 198 tons, 27 tons less than the single phase RCCS. The
maximum concrete structure temperature is 60 ±C under normal operating conditions,
2.5 ±C below that of the single phase RCCS. During a PLOFC emergency shut-down
condition, the maximum concrete structure temperature is 62.3 ±C, 3.5 ±C below that of
the single phase RCCS and still below the normal operating temperature of the single
phase RCCS.
By inducing two phase ow in the CLTHP, the maximum temperature of the working
uid is xed equal to the saturation temperature of the working uid at the vacuum pressure.
This property of water is used to limit the concrete structure temperature. This
e ect is seen in the transient response of the RCCS where the concrete structure temperature
increases until boiling of the working uid starts and then the concrete structure
temperature becomes constant irrespective of the heat load on the RCCS. An increased
heat load increases the quality of the working uid liquid-vapour mixture. Working uid
qualities approaching unity causes numerical instabilities in the theoretical model. The
theoretical model cannot capture the heat transfer to a control volume with a density
lower than approximately 20 kg/m3. This limits the extent to which the two phase RCCS
can be optimised.
Recommendations are made relating to future work on how to improve the theoretical
model in particular the convection modelling in the reactor cavities as well as the two
phase ow of the working uid. Further recommendations are made on how to improve
the basic design of the heat shield as well as the cooling section of the CLTHPs. / AFRIKAANSE OPSOMMING: 'n Reaktor lug spasie verkoelingstelsel (RLSVS) word in die PBMR gebruik om die beton
wat die reaktor omring te beskerm teen direkte stralingskade en hitte. Die gespesi seerde
maksimum temperatuur van die beton is 65 ±C onder normale bedryfstoestande en 125
±C gedurende die noodtoestand afskakeling van die reaktor. 'n Konseptuele ontwerp van
'n geheel en al passiewe RLSVS geskik vir die PBMR is gedoen deur gebruik te maak van
geslote lus termo-sifon (GLTSe) om hitte van die stralingskerm te verwyder oor a horisontale
afstand na 'n ringvormige verkoelingsdam wat rondom die reaktor geposisioneer is.
Die stralingskerm word in die lug spasie tussen die reaktor drukvat (RDV) en die beton
geplaas, 180 mm vanaf die beton.
'n Teoretiese hitteoordrag model van die RLSVS was geskep. Die teoretiese model was
gebruik vir die ontwikkeling van 'n rekenaar program wat die transiënte gedrag van die
RLSVS sal simuleer gedurende normale bedryfstoestande, waar die oorskot gegenereerde
hitte verwyder moet word vanuit die reaktor lug spasie, asook gedurende noodtoestand
afskakeling van die reaktor, waar die afnemingshitte verwyder moet word. Die primêre
doel van die teoretiese model is om the oppervlak temperatuur van die beton te voorspel
onder verskillende bedryfstoestande asook verskillende omgewingstoestande.
Die teoretiese model aanvaar 'n 1D geometrie van die RLSVS. Hitte oordrag d.m.v.
straling asook konveksie vanaf die RDV na die stralingskerm word bereken. The stralingskerm
word gemodelleer as 'n vin. Die vin doeltre endheid was bepaal met die eksperimente
wat gedoen was. Hitte geleiding in die vin was slegs bereken in die horisontale
rigting. Die beton word verhit deur straling vanaf die agterkant van die stralingskerm asook
deur konveksie vanaf die lug tussen die stralingskerm en die beton. The modellering
van die natuurlike konveksie GLTS hitte pype word gedoen deur om gebruik te maak van die Boussinesq benadering en die homogene vloei model.
'n Eksperiment was vervaardig om the teoretiese model te veri eer. Die eksperiment
is 'n volskaal model van die PBMR in die horisontale, of hoof hitteoordrag, rigting, maar
is net 'n 2 m hoë snit. Die eksperimente het gewys dat die konveksie hitte oordrag tussen
die RDV en die stralingskerm nie met gewone konveksie teorie gemodelleer kan word nie.
'n Nusselt getal uitdrukking wat spesi ek ontwikkel is vir natuurlike konveksie in geslote,
reghoekige luggapings wat in die literatuur gevind was, was gebruik om die konveksie
hitteoordrag te modelleer. Die Nusselt getal was ongeveer 3 maal groter as wat klassieke
konveksie teorie voorspel het.
'n Optimeringsprosedure was ontwikkel waar 121 verskillende kombinasies van vin
breedtes en pyp groottes wat gebruik kan word om 'n RLSVS te vervaardig nadat 'n
toepaslike verkoelingsdam diameter gekies is. Die doel van die optimering was om die
RLSVS te ontwerp wat die laagste totale massa het. 'n Verkoelingsdam diameter van 50
m was gekies. Die optimale RLSVS stralingskerm, waarvan die vloeier slegs in die vloeistof
fase bly, bestaan uit 243 GLTSe wat van 62.72 mm binne diameter pype vervaardig
is met 25 mm breë vinne. The totale massa van die enkel fase RLSVS is 225 ton. Die
maksimum beton temperatuur is 62.5 ±C vir normale bedryfstoestande, 65.8 ±C vir 'n
PLOFC noodtoestand afskakeling en is 80.9 ±C vir 'n DLOFC noodtoestand afskakeling.
In die geval waar een GLTS faal gedurende 'n DLOFC noodtoestand afskakeling en die
twee naasgeleë GLTSe moet kompenseer vir die vermindering in verkoelings kapasiteit, is
die maksimum beton temperatuur 87.4 ±C. Dit is 37.6 ±C laer as die gespesi seerde maksimum
temperatuur van 125 ±C. Die RLSVS ontwerp kan verder verbeter word wanneer die
vloeier in die GLTSe kook. Die optimale RLSVS stralingskerm met die vloeier wat kook,
of in twee fase vloei is, bestaan uit 338 GLTSe wat van 38.1 mm binne diameter pype
vervaardig is met 20 mm breë vinne. The totale massa van die twee fase vloei RLSVS
is 198 ton, 27 ton ligter as die enkel fase RLSVS. Die maksimum beton temperatuur is
60 ±C vir normale bedryfstoestande, 2.5 ±C laer as die enkel fase RLSVS. Gedurende 'n
PLOFC noodtoestand afskakeling is die maksimum beton temperatuur 62.3 ±C, 3.5 ±C
laer as die enkel fase RLSVS en nogtans onder die maksimum beton temperatuur van die
enkel fase RLSVS vir normale bedryfstoestande.
Deur om koking te veroorsaak in die GLTS word die maksimum temperatuur van die
vloeier vasgepen gelyk aan die versadigings temperatuur van die vloeier by die vakuüm
druk. Hierdie einskap van water word gebruik om 'n limiet te sit op die maksimum temperatuur
van die beton. Hierdie e ek kan gesien word in die transiënte gedrag van die
RLSVS waar die beton temperatuur styg tot en met koking plaasvind en dan konstant
raak ongeag van die hitte belasting op die RLSVS. 'n Toename in die hitte belasting veroorsaak
net 'n toename in die kwaliteit van die vloeistof-gas mengsel. Mengsel kwaliteite
van 1 nader veroorsaak numeriese onstabiliteite in die teoretiese model. The teoretiese
model kan nie die hitteoordrag beskryf na 'n kontrole volume wat 'n digtheid het laer as
ongeveer 20 kg/m3. Hierdie plaas 'n limiet op die optimering van die twee fase RLSVS.
Aanbevelings was gemaak met betrekking tot toekomstige werk aangaande die verbetering
van die teoretiese model met spesi eke klem op die modellering van konveksie
in die reaktor asook die modellering van twee fase vloei. Verdere aanbevelings was gemaak
aangaande die verbetering van die stralingskerm ontwerp asook die ontwerp van die
verkoeling van die GLTSe.
|
Page generated in 0.0802 seconds