The Comparison between Air Conditioning Energy Saving and Lighting Energy Consumption of Residential Architecture by Using Thermal Buffer Zone - A Case Study of N.T.U「Smart Home」
Date Issued
2009
Date
2009
Author(s)
Wang, Meng-Shin
Abstract
As energy shortage is more and more serious, in recent years, the development and application of thermal buffer zone in saving air conditioning energy consumption becomes a design which can effectively reduce energy consumption of residential architecture. The thermal buffer zone can be classified into exterior buffer zone (Semi-outdoor veranda, eaves gallery and balcony) and interior buffer zone (Indoor zone of common residence which only uses air conditioning equipment for a short time or needs no conditioning equipment). The application of thermal buffer zone in residential architecture for sunshade and heat insulation purpose has the effect of adjusting indoor heat environment and saving air conditioning energy consumption. However, as for indoor utilization of day lighting, because thermal buffer zone decreases the amount of available sunlight at the window, the lighting energy consumption will increase as more lamps and lanterns are required. Therefore, this research tries to discuss the application method of thermal buffer zone in residential architecture and make quantitative comparison of its influence on air conditioning energy consumption and daytime lighting energy consumption, as well as the increase and decrease proportion. This essay first summarizes the predecessors’ empirical researches studying the influence of thermal buffer zone on air conditioning energy consumption, in order to capture their research approaches, methods, tools, and variable setting methods. Then, taking the N.T.U energy-saving demonstration room—Smart Home as an example, this research establishes green house construction numerical models in light of different spatial allocations respectively ignoring external butter zone (veranda, eaves gallery and balcony) and internal butter zone (sunny room and store room) after validating the accuracy of computer numerical simulation calculating result. In addition, this research compares and analyzes the numerical simulation calculating result of air conditioning energy consumption and daytime lighting energy consumption in all-year times. he result shows that with the original spatial allocation, the green house will consume 3383.69Kwh energy by air conditioning system all the year around and 1743.78Kwh by daytime lighting, so totally the energy consumption is 4857.47Kwh. To get the increase and decrease proportion of energy consumption when no thermal buffer zone is applied in the green house for sunshade and heat insulation purpose, and consequently the amount of available sunlight at the window will not be influenced, this research respectively removes the outdoor veranda, eaves gallery and balcony and indoor sunny room and store room from the numerical model. The result shows that the air conditioning energy consumption all the year around will increase steeply by 6471.02 Kwh, and the daytime lighting energy consumption all the year around will only decrease a little by 1289.91Kwh, so the total energy consumption is 7760.93 Kwh, 59.77% more than before. In the hot and humid climate of Taiwan, appropriate application of thermal buffer zone in residential architecture to reduce heat transfer from outdoors to air conditioning zone can produce a considerable energy saving effect in air conditioning system. According to this case study, if no thermal buffer zone is applied in the design of residential architecture, the air conditioning energy consumption will increase steeply and the daytime lighting energy consumption will only decrease a little, so the application of thermal buffer zone really has a positive effect in energy saving and is an feasible and effective strategy for the future energy saving design of residential architecture.
Subjects
Thermal buffer zone
Air conditioning load
Daylighting use
Energyplus
Radiance
Numerical simulation
Actual measurement
Type
thesis
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