Theoretical performance assessment of an integrated photovoltaic /thermal air collector, earth airheat exchanger and shape-stabilized phase change material floor greenhouse using energyanalysis methods

• Main Authors: JHANG,YU-JHIH, 張宇志
• Other Authors: Tsai,Bor-Jang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/84754541371335904951

碩士 === 中華大學 === 機械工程學系碩士班 === 99 === A growing attention is nowadays paid to the building self-sufficiency, therefore natural ventilation, solar heating and cooling, ground cooling (earth air heat exchangers), natural lighting and sun-shading devices…etc. using passive mode strategy. The sustainability-oriented choices, that could be considered optional before, now are unavoidable. Now applying the thin film photovoltaic technology for building integration, and an integrated photovoltaic /thermal (PV/T) air collector, collect hot air driving air flow, mixing the air flow from earth air heat exchanger (EAHE) and hot air flow to the shape-stabilized phase change material (SSPCM) inside greenhouse, SSPCM also absorbs energy form solar lighting through windows and solar panels. A piston cylinder air compressor will adjust the moderate control of air flow and temperatures of ambient and room for the hybrid system. Using natural ventilation passive strategies designs one innovative HVAC system so call “Lung” of a building. Performing a new concept including a ‘‘new material” of the design process, the integration of ‘‘whole building approach” and theoretical performance assessment of this building is analyzed by using energy and exergy analysis methods based on Hsinchu’s weather. Mathematic model will be resolved by the helps of MATLAB 7.0 program and CFD software. Energy needs of air-conditioning、electricity and thermal will be predicted. Overall thermal energy obtained and overall thermal exergy obtained daily and monthly will be calculated. By the way, a finite difference-Fortran program (Hybrid-HVAC) is under developing based upon 2D unsteady heat equation with a Stefan moving boundary problem. This program will be modified into Hybrid-HVACP and should be able to solve the hybrid system building with the PV/T、EAHE and SSPCM numerically in accuracy. The most important, it can be used to validate the different materials of SSPCM and help design the PV/T、EAHE and CLHS system, then optimization design of the greenhouse or renewable energy building. The overall system of the building based upon a simulated house combined with the climate report of Hsinchu city, Taiwan, 0am-24pm, 1st -31th, Aug., 2010. and each month of the year 2011 to investigate: (1) feasibility study of the hybrid system (2) heating capability analysis (3) cooling capability analysis (4) ambient temperature and room temperature levels under different operating conditions such as different air mass flow rate. (5) piston-cylinder compressor design (6) thermal energy obtained and thermal exergy obtained analysis (7) how many power savings in kWh daily、monthly and yearly. Finally, We hope the findings of this study can help people choose their energy savings technology and make the dream of healthy weather、comfortable room come true.