Building Energy Efficiency Strategies And Technologies For Telecommunication Base Stations In Hot And Humid Zone

The building energy consumption in hot and humid zone is large and energy situation is severe. Telecommunication base stations (TBSs) are used in large numbers, and have high heat density, a long cooling season and high energy consumption. Electricity bill for TBSs is an importance cost of mobile communications corporation. The previous studies on energy conservation of TBS mainly focused on equipments, air-conditioning system, airflow optimization and energy management. There are very limited studies on building design of TBS for energy saving. The objective of this thesis is to systematically study the building energy efficiency strategies and technologies of TBSs in hot and humid zone. The main research works are as follows:1. Field investigation.The basic information of TBS was achieved such as the base of classification, indoor heat sources, building envelopes structures, air-conditioning performance and the temperature set point of air-conditioning. A typical TBS in Guangzhou was chose to be investigated and tested in the present study. The test included the various parts of the electricity consumption, the heat release of the equipments, and the refrigerating capacity of the air-conditioning and the heat transmission of the building envelopes. The thermal equilibrium and the heat transfer sections were discussed. Results showed that the building envelopes were the most high resistance section of the heat transfer. And the thermal characteristics of TBS were concluded2. Strategies of the energy efficiency design of building envelopes of TBS and evaluation of their energy efficient.A dynamic thermal simulation program named DeST was applied to estimate the annual cooling load of the typical TBS. The parameters for the simulations were set according to the basic information achieved by the field investigation and testing. The energy consumption of different design of the building envelopes of TBS under different temperature set point and indoor heat sources were calculated. Several energy efficient envelope designs were proposed. The effect on annual energy consumption was analyzed for each energy efficient design and the combined effects were achieved for several combinations of the designs by thermal simulation. The energy efficient design strategy of building envelope for TBS in Guangzhou was proposed. And the building structure giving consideration to both ventilation and shading was proposed.3. Systems study of ventilation cooling technology for TBS. As the heat from the telecommunication equipments can be dissipated directly to outdoor cold air and the runtime of the air conditioners can be shortened by ventilation cooling technology (VCT), resulting in notable energy savings. The adaptability to the climate of Guangzhou and the energy saving potentials of ventilation cooling technology was analized. Accoding to the inadequate of the integrated operation strategy of fans and air-conditioning for VCT, an energy saving maximized integrated operation strategy was proposed. Computational fluid dynamics simulation results indicate that optimization of airflow organization has a strong influence on heat dissipation efficiency for VCT. And the principles of airflow organization was generated. Based on the principles, the plan and section of TBS applied VCT and the layout of the equipments and ventilation system was designed. The characteristics of filter was analized and the advantage of increaing filter sieve area was concluded. Also, the construction of ventilation system was designed.4. The evaluation of energy saving and the applying strategies of VCT.For the defect of the existing evaluate method for VCT such as it only specific type TBS can be evaluated for one test, and the test must be last for a long time, and the oversize error rate, a new evaluate method for VCT was proposed. The evaluate method can be used for different TBS under different meteorological condition, temperature set point, indoor heat sources, performance of air condition and ventilation rate. The relation ship between all influencing factors and annual saved electric energy was analized. The applying strategies and the effect of energy saving of VCT for different TBS were concluded.