In Green Building Evaluation Indexes, the EAC has been adapted as the central HVAC system energy consumption criteria, has been assigned an energy saving factor£\4 of 0.2, despite of the actual power consumption variations existed among various system. In this study, the PILV values of specific VRV systems were utilized, so that actual energy-saving factor £\4 can be evaluated. Furthermore, being lack of the chilled water distribution system, the weighting of power consumption percentages of a VRV system has also been changed into 0.9 vs. 0.1 for the outdoor and indoor units respectively. The methodology established in this study has been justified by suing the actual VRV projects under commercial operations, which can successfully discriminate different energy efficiencies among various systems.

Keywords: EAC, full-scale experimental Validation, ABRI Lab, VRV The VRV air-conditioning system has been gaining overwhelming popularity in recent years due to its superb merits such as high energy efficiency, lower power consumption, low noise and increasing thermal comfort. During last phase of study, computer simulation using the DOE 2.1 as a tool has been performed systematically to establish a calculation equation for the EAC for Green Building Evaluation Indexes, in replacing the currently adapted fixed constant of 0.8. It is the goal of this year¡¦s project to further validate this equation by conducting a series of full-scale experiments at the ABRI Tainan Laboratory. The experimental result will be organized as a model to revise the equations established during last phase of study with good accuracy. Various different VRV systems which were commercially available on the local air-conditioning market will be adapted so that comparative study can be performed among them. The IPLV curves, which are the essential performance curve of each specific VRV system will then be obtained under local weather conditions. It is expected that through the execution of this project, the calculation equation of the VRV system to be adapted in the Green Building EAC evaluation index will be finalized and validated by the full-scale experiments. The test facilities established during this phase of study will then become the most suitable location of similar tests when building energy conservation is concerned.

Submitted by Fabricia Fialho Reginato (fabriciar) on 2015-07-23T01:11:46Z No. of bitstreams: 1 FelipeBrochier.pdf: 2248315 bytes, checksum: 51a12fbb2e530bf08f1847557932b381 (MD5) / Made available in DSpace on 2015-07-23T01:11:46Z (GMT). No. of bitstreams: 1 FelipeBrochier.pdf: 2248315 bytes, checksum: 51a12fbb2e530bf08f1847557932b381 (MD5) Previous issue date: 2014-02 / Nenhuma / Este trabalho tem como objetivo otimizar o custo operacional dependente dos parâmetros de vazão de ar do condensador, número de aletas e de circuitos do condensador, frequência do compressor e parâmetros do dispositivo de expansão de um sistema de um condicionador de ar do tipo split hiwall unitário com vazão variável de refrigerante (VRV). Para a otimização foram consideradas as freqüências de ocorrência de quatro condições de temperatura do ambiente externo na cidade de Porto Alegre. O condicionador de ar abordado neste trabalho troca calor utilizando um ciclo de compressão de vapor de simples estágio, tendo como fluido de trabalho o refrigerante R-410A. O sistema completo, composto de um compressor, um condensador, um evaporador e tubo capilar, foi modelado analiticamente utilizando o software EES (Engineering Equation Solver) e ajustado de acordo com testes realizados em calorímetro. Para a otimização, um algoritmo genético foi programado no próprio EES. Após a otimização do custo operacional em função dos parâmetros físicos de projeto, o COP aumentou em até 12 % na condição de ar externo a 35 °C. A otimização em função dos parâmetros de controle mostrou aumento ainda mais significativo do COP do sistema. Também é feita uma comparação entre os valores de COP de um sistema de vazão constante de ar e refrigerante e um sistema com vazão variável de ar e refrigerante. / This work aims to optimize the operational cost of an air conditioning system with variable refrigerant flow (VRF). The cost is dependent of the following parameters: condenser air flow, number of condenser fins and circuits, compressor frequency and the expansion device. The optimization considered the frequencies of occurrence of four distinct ambient temperatures in the city of Porto Alegre. The air conditioner presented in this work exchange heat using a single stage vapor compression cycle, with the refrigerant R-410A as the working fluid. The complete system comprises a compressor, a condenser, an evaporator and a capillary tube and was analytically modeled using the EES (Engineering Equation Solver) software. The parameters were fitted according to results obtained in a calorimeter and for optimization, a genetic algorithm was programmed using the same software. After the optimization of the operational cost as a function of the project parameters, the COP was raised up to 12% in external ambient air at 35 °C. The optimization of the operational cost as a function of the control parameters showed even a more significant system COP raise. A comparison between the COP of a constant air and refrigerant flow system and a variable air and refrigerant flow system was also performed.

Being located in subtropical area, the weather in Taiwan is hot and humid which imposing huge cooling load on buildings. Conventionally, central air-conditioning plants were designed using refrigerant compressors to make chilled water, and then pumped through the zone pumps to meet the cooling load, providing air-conditioning by Fan Coil Unit (FCU) or Air-Handling Units (AHU) by ductwork. To meet the varying cooling demand, two important systems were developed for energy savings, namely, the Variable Water Volume (VWV) system, and the Variable Air Volume (VAV) system, which has been widely adapted in Taiwan area. The working principle is mainly devoted to adjusting the volume of the chilled water and/or air volume delivered through inverter-driven pimps and fans to achieve energy saving. On the other hand, recently in Japan, an important energy-saving air-conditioning system has been developed which directly varying the refrigerant flow rate to meet the varying cooling demand by inverter-driven compressors, named VRV system. Comparative to the conventional air-conditioning system, the heat exchange mechanism of the VRV system has been effectively enhanced by direct exchange of the refrigerant and the cool air, which is in effect a combination of the VWV and VAV system. It provided huge energy saving potential for the application on buildings with moderate cooling loads, such as 100 USRT or so. It is the goal of this research project, to evaluate the performance of the VRV system in Taiwan¡¦s hot and humid climate, by performing full-scale experimental investigation so that energy savings effect can be validated quantitatively. Since VRV system is fairly new in Taiwan, the validation of the system performance under local weather condition is of particular importance. It is anticipated that through the changing of the operation conditions, such as different outdoor conditions, various partial load conditions, and different scheduling of the VRV system, the power consumption of the VRV vs. conventional system can be compared precisely and quantitatively. These experimental data will, in turn, provides valuable reference to the establishment of the building energy consumption index in Taiwan, which outwits the direct adoption of the foreign data such as from Japan, in achieving a much reliable database.

The aim of the master’s thesis is the design of a new music club building in Valtice. The first part of the thesis is the architectural and structural design. The building of irregular rectangular shape with one underground floor and two above-ground floors is divided into two main operational units – a dance hall and a rock club. The chosen structural system is reinforced concrete columns with locally supported floors. The walls are made of sand-lime blocks. The main insulation material is hemp. The building is covered by a flat roof with extensive greenery. The second part deals with the building services. Ventilation, heating and cooling are provided by HVAC units. The heat source is condensing gas boilers, the cooling source is an outdoor VRV cooling unit. The third part of the master‘s thesis is the acoustic assessment of the building. As a noise source, it mainly addresses the acoustic impact on the surrounding buildings in the vicinity. Furthermore, it optimizes the reverberation time in the rock club. The project was produced in accordance with the legal regulations and technical standards and created in AutoCAD software.