<p>In order to reduce the discharge of the greenhouse gas CO2, the use of biomass is nowadays promoted as fuel in boilers. Compared to boilers fired with coal and oil the biomass-fired boilers have more complications related to both fouling and corrosion on the heat transfer surfaces. After the combustion, unburned inorganic matter in state of vapour, melts and solid particles are transported in the flue gas and may form deposits on heat transfer surfaces.</p><p>Deposits on the heat transfer surfaces may result in both increasing corrosion and decreasing boiler efficiency as the heat transfer rate to the superheaters and reheaters decrease by deposits.</p><p>In order to understand the process of deposit build-up, the whole combustion and transport process had to be analysed including aspects such as, boiler design, fuel properties and combustion environment, followed by particle transport phenomena and the probability for particles to get stuck on the heat transfer tubes.</p><p>In this thesis numerical simulation of particle trajectories has been conducted as well as measurements of deposits on a special designed deposit probe followed by investigation of on-site measurements of deposit depth on the super-heater tubes in a circulating fluidised bed in Västerås, Sweden.</p><p>Numerical simulations of particle trajectories in the vicinity of two super-heater tubes were conducted in an Eulerian-Lagrangian mode considering the flue gas and ash particles phase. Particle impingements on the tubes were investigated for different particle sizes. The results from the particle trajectory simulations show that particle larger than 10 µm will mainly impinge on the windward side of the first tube but, however also on the sides of the second tube in the flue gas flow direction. In theory as well as from observations and measurements two tubes can merge together by the deposit build-up. Smaller particles are usually more dispersed due to turbulence and thermophorectic forces, resulting in a more even impingement distribution on the whole surface of the tubes.</p><p>Probe measurements reveal that the deposit layer growth rate have a significant temperature and time dependence. After the initial deposit build-up a sintering process occurs and sintering is also proven to be dependent on temperature and exposure time.</p><p>Soot-blowing is the most common method to reduce the effect of deposits on the heat transfer tubes. In the present thesis the soot boiling efficiency is therefore also investigated. The soot-blowing show a strong positive effect on the heat transfer rate in a short time (hours) perspective after a soot-blowing cycle is completed. This positive effect is much weaker when considering a time period of three years. This is an effect of fact that soot-blowing mostly remove the loose part of the deposit material leaving the hard sintered part unaffected.</p><p>The subject of deposit build up on superheater tubes in large scale boilers involves multi-discipline knowledge and historically, the related research is mostly conducted as measurements and experiments on operating plants. Possibly in the future, theoretical simulations will have a bigger part of research on deposit build-up where the calculations are to be calibrated through measurements on real sites plants.</p>

<p>Heat and power stations are often in need of optimizations. A simulation model is a tool for findingways to optimize the plant. The scope of this diploma work is to develop a simulation model ofBoiler 5 at Mälarenergi AB. Boiler 5 is a circulated fluidized bed boiler that was taken into service inyear 2001. Among the included parts in the boiler are cyclone, convection part andINTREX-chambers. The software that was used for the simulation was SimTech’s IPSEpro. IPSEprois a heat and mass balance software for steady state calculations. The program comes with a set ofmodules in a library called APP_lib which contains modules such as preaheaters, pump, boiler andturbine stages. The user can however design own modules in the Model Development Kit, since thelibrary code is open source. The development of the simulation model started with an updating of anold model from year 2003. Values provided from Foster Wheeler where then used to make the modelcalculate in a right way. Thereafter some calculations of the super heaters’ heat transfer coefficientswere made. The coefficients were then translated into IPSEpro’s own programming language ModelDescription Language, and were put into the model’s modules. The results were compared with realvalues from the plant’s system. It showed that the calculated values needed more investigations to bemore accurate. The conclusion was that the final model needs more equations to describe the plant in amore realistic way.</p>

<p>This diploma work covers an investigation over the heat - and hot water systems of the</p><p>tenant-owner's association, Bogården. The heat - and hot water needs of Bogården are</p><p>satisfied by both district heating as well as three heat pumps. Implemented investigation</p><p>shows that the heat pumps are not used in a profitable way. Apart from that, the reserve</p><p>possibilities are small. There is also a risk of the growth of Legionella bacterium in the</p><p>hot water system.</p><p>Since the heat pumps are already installed, HSB-Gävleborg (responsible for Bogården)</p><p>has a wish to investigate possible proposed actions for optimization of existing plant.</p><p>After completed investigation, a new proposed action is presented. The new proposed</p><p>action goes on intercepting the hot water production and using the heat pumps to only</p><p>heat production during the heating season. Why the hot water production should be</p><p>intercepted, is just in order to eliminate the risk of Legionella. Besides, the new proposal</p><p>is going to bring about a reserve of 1,534,000 SEK during a twenty-year period. This is</p><p>approximately twice as much as what the existing plant may bring during the same</p><p>period.</p><p>During the work's review, it also has been established that heat - and hot water systems</p><p>are error regulated. Since the diploma work does not cover that piece it is instead</p><p>informed as proposals subject to further investigation.</p>

<p>Drying laundry has become a huge consuming factor of energy in residential areas through drying machines as tumble dryers and cabinet dryers. In USA the increasing use of drying machines in households increased from 40% during the 1970 to 80% in the 1990, which correspond to a usage of approximately 76 million drying machines.</p><p>The European market for drying cabinets is not huge. It is mainly Scandinavia that is using cabinet dryers for drying laundry these days. Nowadays cabinet dryers that use hoses to evacuate humid air out the building are developed in the market. Asko Cylinda AB has developed a new condenser cabinet dryer out of a regular cabinet dryer. With the new condenser cabinet dryer no hoses are required because the drying process take place in a closed recirculation system. Several openings at the back of the condenser cabinet dryer make it possible to dry laundry horizontal in different sections.</p><p>In this thesis the condenser cabinet dryer has been studied in a simulation program that is called Comsol MultiPhysics. A 2-dimensonal model was created where the airflow patterns and temperature distribution in the dryer was simulated. On the basis from the basic model of the dryer several modifications was created to attain knowledge of which modifications contributes to an improved airflow pattern.</p><p>The temperature distribution in the condenser cabinet dryer is uneven in the sections according to the simulations the air distribution is good in section 2 and 3 in the basic model. The factor that has the largest impact on the air distribution is the air stream that flows up at the back inside the cabinet, the air stream restrains a part of the hot air jet from the openings at the back. Case 1.1 is the modification that created the best airflow profile, which contributed to an even temperature distribution. In the modification the textiles were used to cover up the space at the back of the cabinet to eliminate the air stream to flow up between the textile and the openings. The effect transport between the textile and the air increased with 50 % at several sections when the modification was carried out according to case 1.1.</p><p>This study is a good basis for further studies in simulation of airflow and temperature distribution in the condenser cabinet dryer. The next step in the study is to create a 3-dimensional model of the cabinet. With this study the 3-D model could be accomplished easier by using parameters from the 2-D model as data on the boundaries. By doing so the system could be delimited, this would reduce the use of computer capacity.</p> / <p>Torkning av kläder har med tiden utvecklats till att bli en stor faktor av energiförbrukning i bostadsområden genom maskiner som bl. a. torktumlare och torkskåp. I USA ökade användningen av torkmaskiner i hushåll från 40% under 1970 till 80% i 1990, vilket motsvarar en användning av ca 76 miljoner torkmaskiner.</p><p>Marknaden för torkskåp är inte stor i Europa. Det är främst Norden som använder torkskåp för torkning av kläder. I dagsläget tillverkas s.k. avluftarskåp, d.v.s. det krävs en slang ut ur huset för att evakuera den fuktiga luften. Asko Cylinda AB har på senare tid utvecklat ett nytt kondensorskåp av ett sådant avluftarskåp. Med det nya kondensorskåpet behövs det inte någon evakueringsslang ut ur huset eftersom torkningen sker i ett recirkulerande system. Gälarna i bakkanten av torkskåpet möjliggör plantorkning eftersom luften skickas in i flera sektioner.</p><p>I uppsatsen har kondensorskåpet studerats i ett simuleringsprogram som kallas Comsol MultiPhysics. En 2-dimensionell modell skapades där bl.a. luftströmningsbilden och temperaturfördelningen i skåpet simulerades. Utifrån grundmodellen skapades ett antal modifieringar på kondensorskåpet för att erhålla kunskap om vilka modifieringar som ger bättre luftflödesbilder.</p><p>Temperaturfördelningen i kondensorskåpet är ojämn enligt simuleringarna då luftdistributionen är bäst i sektion 2 och 3 i grundmodellen. Faktorn som har störst påverkan på luftströmningsprofilen är den uppströmmande luften vid baksidan av skåpet, luften bromsar upp den varma luftstrålen ut från gälarna. Fall 1.1 är modifieringen som skapa den bästa luftströmningsprofilen vilket bidrog med en jämnare temperatur-fördelning. I modifieringen användes textilerna för att täppa igen ytorna vid baksidan av kondensorskåpet för att eliminera uppströmmande luft framför gälarna. Effekttransporten mellan textilen och luften ökade med upp till 50 % på flera sektioner då grunduppställningen modifierades enligt fall 1.1.</p><p>Studien i denna rapport är ett bra underlag för fortsatta studier inom simulering av luftströmningen och temperaturfördelningen i kondensorskåpet. Nästa steg i studien är att konstruera en 3-dimensionell modell av skåpet. Med hjälp av den här studien kan en 3-D modell underlättas genom att använda parametrar från 2-D modellen som indata på randvillkor. Genom det kan systemet avgränsas för att minimera 3-D modellens konsumtion av dataminne.</p>

<p>Nya Vargbroskolan stod klar januari 2008. Det är en skola unik i sitt slag då fokus under hela projekteringen har legat på energieffektivisering och låg miljöpåverkan. Resultatet blev en superisolerad byggnad med ett hybridventilationssystem med kulvert som värmer luften innan den går in i byggnaden på vintern och kyler på sommaren. För att se hur skolan fungerar i praktiken pågår en utredning där innemiljön och energiåtgången utvärderas.</p><p> </p><p>I den här rapporten behandlas den termiska komforten, luftkvaliteten och ljudmiljön på Vargbroskolan. Ljudmiljön är avgränsad till installationsbuller som orsakas av ventilationssystemet. När det gäller luftkvaliteten är den inriktad på koldioxid och luftburna partiklar. Den termiska komforten beror av fyra faktorer, temperatur, värmeinstrålning, luftrörelser och relativ fuktighet.</p><p> </p><p>Bullermätningar för att mäta den ljudnivå som är orsakad av ventilationssystemet är gjorda enligt SS-EN ISO 16032:2004. Dessa resultat är sedan jämförda med vad de svenska normerna säger. I sex olika klassrum har koldioxidhalt, temperatur och relativ fuktighet mätts med en integrerande mätanordning. För samma klassrum har närvarostatistik förts under två veckor i februari och på så sätt har mätdata och antalet personer kunnat jämföras för att hitta något samband. Partikelmätning har genomförts med hjälp en partikelräknare, Climet CI-500, för att kunna utvärdera kulvertens sedimentationsförmåga när det gäller luftburna partiklar.</p><p>Förutom olika mätningar har också en enkätundersökning gjorts. Det är skolpersonalen som svarat och enkäten är en MM 040 NA, vilket är en standard enkät av Örebromodellen.</p><p> </p><p>Slutsatserna är att bullernivån från ventilationssystemet på Vargbroskolan ligger väldigt nära och ibland lite över normvärdena, vid maximalt flöde. Skolpersonalen tycker inte, enligt enkätundersökningen som gjorts, att detta buller är något störande. Koldioxidhalten ligger lite högt under vissa perioder men verkar inte påverka upplevelsen av inneklimatet negativt. Den termiska komforten är inte särskilt bra på Vargbroskolan, även om den är bättre än på referensskolor enligt enkäten. Sämst är det då det gäller temperaturen. Även om det är kallt uppfattas inte miljön som dragig mer än ibland. Den relativa luftfuktigheten ligger för lågt periodvis, men inte så lågt att det skulle ge fysiska besvär för människorna som vistas i lokalerna. Dock får det ju ses som positivt att en konstant temperatur går att hålla med hjälp av det temperaturstyrda ventilationssystemet.  Detta visar att systemet fungerar bra och som det ska.</p> / <p>In January 2008, the new Vargbroskolan was ready to be used. It is a school unique in its kind because the entire design has been focused on energy efficiency improvement and low environmental impact. The result became a very high isolated building with a hybrid ventilation system. The building has a culvert which heats the air before it gets in to the building in the winter and cools it in the summer. In order to see how the school functions in reality, an investigation where the indoor environment and the energy consumption are evaluated.</p><p> </p><p>In this report, the thermal comfort, the air quality and the sound environment in Vargbroskolan is treated. The sound environment is delimited to the noise caused by the ventilation system. When it comes to the air quality, focus is lying on carbon dioxide and airborne particles. The thermal comfort depends of four factors, temperature, thermal radiation, air movements and relative humidity.</p><p> </p><p>To measure the sound level caused by the ventilation system measurements has been done according to SS-EN ISO 16032:2004. These results are then compared to the Swedish standards. In six different classrooms the carbon dioxide, temperature and relative humidity has been measured with an integrating measuring instrument. For the same classrooms presence statistic has been pursued during two weeks in February. In this way data and the number of persons can be compared in order to find some connections. Particle measurement has been implemented with help of a particle counter, Climet CI-500, in order to evaluate the sedimentation ability of the culvert when it comes to airborne particles. Apart from different measurements an inquiry has also been done. The inquiry is of the kind MM 040 NA which is a standard questionnaire of Örebromodellen and it is the staff on Vargbroskolan who has replied.</p><p> </p><p>The conclusions are that the noise level caused by the ventilation systemet lies near and sometimes a little bit over the standard values, during maximum flow. The staff on Vargbroskolan does not think that this noise is disturbing, according to the inquiry. The concentration of carbon dioxide is a little bit to high during some periods but does not seem to influence the experience of the indoor environment negative either. The thermal comfort is not particularly good in Vargbroskolan, although it is better than the thermal comfort in reference schools according to the inquiry. The temperature is the factor most people complains about, but even though it is cold, the environment does not seem draughty more than sometimes. The relative humidity lies to low periodically, but not so low that it would give physical inconveniences for the people in the classroom. However, the system holds a constant temperature which is positive and it also shows that the system is working correctly.</p>

While biomass utilization for energy conversion in the industrialized nations is being largely developed, highly efficient and environmentally friendly, many tropical countries still use biomass at low efficiencies and high emission levels. The main reasons for these gaps are both political and technological: the energy markets are different, the Gross National Product (GDP) differs widely, and the feedstock differs in form and conversion behaviour. By implementing newer technologies adapted for tropical biomass feedstock, there would be a large potential in these countries for increased energy services since access to modern energy still is an essential step for improving the GDP for a country. Two dominant and tropically placed industries available for energy improvements are the cane sugar and palm-oil industries, which both produce an abundant amount of biomass residues. One step towards enhanced utilization of the residues, which would not require large investment costs in the power plant section nor in the processes of these industries, would be to install a pelletizing unit in the industry area to make fuel out of the excess residues for sale to the nearby villages. The pellets could be used both for cooking/heating and for small-scale power generation in a gasification-IC engine plant. The overall objective of this study is to experimentally evaluate the biomass residues in pellet form from the cane sugar and palm oil industries during conversion to useful energy in small-scale systems. The thesis is built upon five publications which include experimental analysis on flaming pyrolysis and rapid heating of pellets (paper I), pyrolysis in oxygen-free atmosphere and slow heating with subsequent steam gasification (paper II), global pelletizing data such as relative energy consumption, temperature levels, particle size and moisture content for successful pelletizing process (paper III), downdraft gasification evaluation including reactor temperature distribution, gas composition, cold-gas efficiency and packed-bed mechanics (paper IV) and a numerical model including the overall system efficiency for residue-to-electric power based in a small-scale gasifier system (paper V).The single-pellet studies revealed that pyrolysis in reducing atmosphere is to prefer compared to flaming pyrolysis in oxidizing environment with regards to the char quality. The studies also showed favourable thermochemical and mechanical behaviour for smaller size pellets (Ø6- Ø8mm) compared to larger size ones (Ø12 mm). Therefore, a downdraft gasifier of closed constricted type was designed for real gasification tests of the residue pellets of sizes Ø6- Ø8mm. These tests showed that all the studied pellet sorts could be used in one and the same gasifier, resulting in different reactor temperature distributions and gas compositions with lower heating values in the range of 4.1-5.4 MJ/m3n dry gas. The reactor bed dynamics showed to be dependent both on the fuel reactivity and the size, with less pressure drop for larger size pellets with lower reactivity. The pelletizing process itself revealed that the selected residues all needed higher moisture content and smaller particle size than recommended for wood for successful pelletizing. The relative electric energy consumption was lower when producing larger size pellets Ø8 mm than smaller ones (Ø6 mm) of same material. For untreated wet empty-fruit bunch (EFB) a stand-alone power plant with integrated EFB pre-treatment and gasification could generate 380 kWh of net electricity per ton of EFB at a “well-to-wheel” efficiency of 15%. / QC 20100712

Nya Vargbroskolan stod klar januari 2008. Det är en skola unik i sitt slag då fokus under hela projekteringen har legat på energieffektivisering och låg miljöpåverkan. Resultatet blev en superisolerad byggnad med ett hybridventilationssystem med kulvert som värmer luften innan den går in i byggnaden på vintern och kyler på sommaren. För att se hur skolan fungerar i praktiken pågår en utredning där innemiljön och energiåtgången utvärderas.   I den här rapporten behandlas den termiska komforten, luftkvaliteten och ljudmiljön på Vargbroskolan. Ljudmiljön är avgränsad till installationsbuller som orsakas av ventilationssystemet. När det gäller luftkvaliteten är den inriktad på koldioxid och luftburna partiklar. Den termiska komforten beror av fyra faktorer, temperatur, värmeinstrålning, luftrörelser och relativ fuktighet.   Bullermätningar för att mäta den ljudnivå som är orsakad av ventilationssystemet är gjorda enligt SS-EN ISO 16032:2004. Dessa resultat är sedan jämförda med vad de svenska normerna säger. I sex olika klassrum har koldioxidhalt, temperatur och relativ fuktighet mätts med en integrerande mätanordning. För samma klassrum har närvarostatistik förts under två veckor i februari och på så sätt har mätdata och antalet personer kunnat jämföras för att hitta något samband. Partikelmätning har genomförts med hjälp en partikelräknare, Climet CI-500, för att kunna utvärdera kulvertens sedimentationsförmåga när det gäller luftburna partiklar. Förutom olika mätningar har också en enkätundersökning gjorts. Det är skolpersonalen som svarat och enkäten är en MM 040 NA, vilket är en standard enkät av Örebromodellen.   Slutsatserna är att bullernivån från ventilationssystemet på Vargbroskolan ligger väldigt nära och ibland lite över normvärdena, vid maximalt flöde. Skolpersonalen tycker inte, enligt enkätundersökningen som gjorts, att detta buller är något störande. Koldioxidhalten ligger lite högt under vissa perioder men verkar inte påverka upplevelsen av inneklimatet negativt. Den termiska komforten är inte särskilt bra på Vargbroskolan, även om den är bättre än på referensskolor enligt enkäten. Sämst är det då det gäller temperaturen. Även om det är kallt uppfattas inte miljön som dragig mer än ibland. Den relativa luftfuktigheten ligger för lågt periodvis, men inte så lågt att det skulle ge fysiska besvär för människorna som vistas i lokalerna. Dock får det ju ses som positivt att en konstant temperatur går att hålla med hjälp av det temperaturstyrda ventilationssystemet.  Detta visar att systemet fungerar bra och som det ska. / In January 2008, the new Vargbroskolan was ready to be used. It is a school unique in its kind because the entire design has been focused on energy efficiency improvement and low environmental impact. The result became a very high isolated building with a hybrid ventilation system. The building has a culvert which heats the air before it gets in to the building in the winter and cools it in the summer. In order to see how the school functions in reality, an investigation where the indoor environment and the energy consumption are evaluated.   In this report, the thermal comfort, the air quality and the sound environment in Vargbroskolan is treated. The sound environment is delimited to the noise caused by the ventilation system. When it comes to the air quality, focus is lying on carbon dioxide and airborne particles. The thermal comfort depends of four factors, temperature, thermal radiation, air movements and relative humidity.   To measure the sound level caused by the ventilation system measurements has been done according to SS-EN ISO 16032:2004. These results are then compared to the Swedish standards. In six different classrooms the carbon dioxide, temperature and relative humidity has been measured with an integrating measuring instrument. For the same classrooms presence statistic has been pursued during two weeks in February. In this way data and the number of persons can be compared in order to find some connections. Particle measurement has been implemented with help of a particle counter, Climet CI-500, in order to evaluate the sedimentation ability of the culvert when it comes to airborne particles. Apart from different measurements an inquiry has also been done. The inquiry is of the kind MM 040 NA which is a standard questionnaire of Örebromodellen and it is the staff on Vargbroskolan who has replied.   The conclusions are that the noise level caused by the ventilation systemet lies near and sometimes a little bit over the standard values, during maximum flow. The staff on Vargbroskolan does not think that this noise is disturbing, according to the inquiry. The concentration of carbon dioxide is a little bit to high during some periods but does not seem to influence the experience of the indoor environment negative either. The thermal comfort is not particularly good in Vargbroskolan, although it is better than the thermal comfort in reference schools according to the inquiry. The temperature is the factor most people complains about, but even though it is cold, the environment does not seem draughty more than sometimes. The relative humidity lies to low periodically, but not so low that it would give physical inconveniences for the people in the classroom. However, the system holds a constant temperature which is positive and it also shows that the system is working correctly.

Abstract The future of ethanol is depending on good solutions for the production. ENA energy power plant produces electrical power and district heating by heating biofuel. By building an integrated bioenergy plant surplus steam could be used to produce ethanol as fuel to vehicle. This would mean that ethanol is produced renewable energy and the energy for the process derives from the surplus of power.  ENA energy, MDH (the University of Mälardalen) and the energy authority has initiated a research project were different bioenergy combinations integrate with existing power plant.  As a part of the project which size an integrated factory should be to gain the best efficiency for the plant was investigated. Consideration will be taken to the cost of the production in order to be competitive to the price of imported ethanol.     Etanolens framtid vilar på bra lösningar för framställning.  I ENA energi kraftverk i Enköping produceras el och fjärrvärme genom eldning av biobränsle.  Genom att bygga ett integrerat bioenergikraftverk där skulle man kunna använda överskottsånga till att framställa etanol som fordonsbränsle. Detta skulle innebära att etanolen framställs med ett förnybart bränsle och energin till framställningen kommer från ett överskott på värme.   ENA energi, MDH och energimyndigheten har initierat ett forskningsprojekt där en bioenergiintegrering skall undersökas.  Som del i detta skall här undersökas vilken storlek en integrerad etanolfabrik skall ha för att nå högsta totala verkningsgrad för verket samt om framställningspriset kan konkurrera med importerad etanol.

Pappersbruket BillerudKorsnäs AB är idag en av Sveriges ledande tillverkare och leverantör av förpackningspapper, kartong samt wellråvaror. Företaget har en framtida målsättning att i tillverkningsprocessen bli självförsörjande på energi och detta genom en intern förbränning av biobränsle i form av bark och flis i sodapannor. Sodapannan utgör på så sätt fabrikens energidistributionssystem. Vid den kontinuerliga förbränningen av svartlut följer stoft och slagg med rökgaserna och fastnar på sodapannans värmeytor som består av rörpanel. Detta är problematiskt då slagg på värmeytorna försämrar värmeupptagningen och gör den ineffektiv. Rengöringen av sodapannans värmeytor sker med hjälp av 74 stycken robusta utdragbara sotblåsare, varav cirka 50 är av modell IK-SD. På senare tid har företaget haft återkommande problem med att snäckhjulet i sotblåsarnas växellådor havererar. Genom observationer, överslagsberäkningar och datorbaserade analyser möjliggjordes en hållfasthetsutredning av snäckhjulet. Den tangentiella kraften som påfrestar snäckhjulets kuggar överstiger den beräknade högsta tillåtna tangentiella kraften. Säkerheten mot ytumattning beräknas med överslagsberäkningar till 0,92 och med databaserade analyser till 0,72. Detta innebär att en obefintlig säkerhet råder mot ytutmattning. Snäckhjulets kuggytor drabbas av ytutmattning på grund av påfrestande kuggkrafter samt hårda driftförhållanden, vilket efter en tid leder till kuggbrott. Haveri av snäckväxeln orsakas av bristande smörjning, höga temperaturer och höga kuggkrafter. Höga drifttemperaturer av snäckväxeln orsakar en reducerad smörjförmåga av smörjfettet, vilket leder till extrem förslitning och efter en tid brott av snäckhjulets kuggar.

Hospital is of interest when consider its especial function. Because of the obviously different between the normal residential buildings, the requirement of hospitals’ indoor climate strictly differs from other buildings. The author starts this report by briefly stating the building construction currently. Surrounded the topic of thermal comfort and energy consumption, many suggestion and options came out in this report to develop a better condition. Firstly, the introduction of the hospital buildings requires the background of the hospital object and the purpose to this report will be stated. Secondly, the simulation tool and how to use this tool simulate our real case are introduced. Then, the summer case is investigated by this tool after the model is proved to be validated. Finally, the improvement of establishing a better indoor environment is raised and the results of improvement and conclusion can be found. The final result will show the optimal solution that discovered by this study after compared different alternatives carefully.