Guo Qiang Xia

The Impact of Double Skin Facade on Building Energy Consumption in Daylighting Control Mode

Energyplus is used to discuss the impact of double skin façade (DSF) on building lights, heating and cooling energy consumption in daylighting control mode by simulating the building lights, heating and cooling energy consumption with different height of double skin façade (DSF) and different air cavity width .Thus the influence rules on the lights, heating and cooling energy in daylighting control mode can be found.

Hydraulic Condition Analysis of Different Position Heat Exchange Stations in Heat Supply Network

Through the establishment of Yuhua ring-shaped heat supply network model, the paper analyses the influence on hydraulic condition and the heat source’s flow change when heat exchange station at different locations closed. Final results show that the nearer heat users distance the closed heat exchange station, the bigger change in hydraulic condition; When the farther heat exchange station closed, it has more influence than the nearer one on the whole network’s hydraulic condition, but it has little influence on the heat source’s flow change.

Risk Assessment and Control Measures of Air Conditioning System in Large Commercial Building

The risks of air conditioning system were found out by analyzing safety accident in recent years, and the derivative and secondary disasters were identified about air conditioning system. On the basis of the theory of man-machine-environment-management of system safety analysis, the risk index system of the possibility and consequences severity was established by identifying the possibility and the consequence severity factors resulting in the occurrence of air conditioning. The risk grades were determined by using the risk matrix to conduct the risk assessment for air conditioning system of a Commercial building in Tianjin. The preventive measures and control safety measures were proposed for air conditioning system Security.

A Review of Research Development of Ventilated Double-Skin Facade

Demands for the building energy conservation, thermal and visual comfort make the ventilated double-skin facade (DSF) more attractive and more popular in commercial buildings. This paper reviews the recent research development of ventilated double-skin facade in China. The velocity and temperature distribution in the double-skin facade (DSF) are reviewed, together with the effects of glass types, channel width, intensity of solar radiation and shading methods on the heat transfer of ventilated double-skin facade (DSF). This paper also describes the effect of the different combinations of glass, blinds settings, ventilation rate and the channel width, intensity of solar radiation and shading. Furthermore, the methods to improve the energy saving of ventilated double-skin facade (DSF) are also reviewed.

Experimental Study on Opening or Closing Performance of Ventilated Double-Skin Facade on the Airflow Window in Winter

An actual office building with ventilated double-skin facade (VDSF) in cold region has been studied for researching the opening or closing performance of VDSF on the airflow window in winter. In the daytime of winter, airflow window of external facade should be closed, and airflow window of internal facade should be open, according to which the indoor temperature can be kept at a comfortable level effectively, and the purpose of reducing the indoor thermal load and the building energy consumption of air conditioning can be reached. The research also provides the best time of the airflow window of internal facade to open and close. If one directly applies the analysis of experimental results to guide the construction of VDSF and other energy-saving design of buildings, it can provide a reliable reference for similar projects.

Experimental Analysis of the Coefficient of Building Comprehensive Property

According to the heating theory of heat balance and heat consumption of buildings[1], derivate formula for the coefficient of building comprehensive property. Choose five typical districts for the Study. The coefficient of building comprehensive property can be used as the secondary side of adjustment and control for the water temperature conditions and methods[2]. By all typical districts data collection and analysis, verify that the construction of the coefficient of building comprehensive property in guiding role of central heating system control.

Analysis on the Indoor Temperature in Households of Heating Metering with Work Mode

Based on the theory of the room heat balance ,this paper discussed the 24 hours indoor temperature with work mode ,and concluded that indoor temperature changed in three stages:steady period, cooling period and warming period .By testing the actual indoor temperature of different heating ways with work mode and comparing the cooling process of theory results with field measurements after the temperature control valve closed ,concluded that the theory results and field measurements were basically the same and if the temperature control valve was closed less than ten hours in the daytime, the largest reduction of indoor temperature were about 2 ~ 3 °C, and it wont reduce peoples comfort with work mode when indoor or outdoor temperature was high.

A summer case study on applying ventilated double-skin facade to a building in cold zone of China

It is crucial for ventilated double-skin facade (DSF) compared to single- skin facade to avoid high energy consumption, optic pollution and inadequate ventilation problems. In this paper, the performance of ventilated DSF applied to a building located in a university in cold zone (Tianjin) of China is tested. The original conditions of both outdoor and indoor within each testing room are comparatively same.The temperature behaviors of both the ventilated air cavity of DSF and indoor space with different experimental modes during summer are investigated. Additionally, the effects on indoor temperature due to the ventilated DSF with different modes in summer are also analyzed. The results shows that the ventilated DSF is a effective approach to reduce indoor temperature; the opening airflow windows of external façade of the DSF should be effective to lower temperature of both the ventilated air cavity of DSF and indoor space.

Study on the Behavior Energy-Saving of the Heat Users of Central Heating System

As one of the effective ways of building energy saving, behavior energy-saving has the positive promotion function regarding the heating energy saving for the heat users of central heating system. The effect of behavior energy-saving on the heating load characteristics of central heating systems was studied based on the present development of central heating metering technology. The study was promoted combined the theoretical analysis and questionnaire survey. At first, the influence factors of behavior energy-saving were analyzed. Then the questionnaire survey about the present situation of behavior energy-saving was carried out and the basic heating modes of heat users were summarized considering on heating mode, habits and customs and the family structure characteristics. The concept and mainly form of behavior energy-saving and behavior energy-saving rate of central heating system heat users were clear and definitude by study on the behavior energy-saving rate. Thus it has good coaching and promoting effect on the development of behavior energy-saving.

The Computational Analysis of Parameter Setting on Secondary Network Distribution Heat Source in Central Heating System

Two combined operation modes of basic heat source and distribution heat source are described, the possible values of basic heat source capacity coefficient α under these two combined operation modes in each region with heating provision are explored, the theoretical calculation formula of distribution heat source opening temperature and closing temperature is derived, and figure out distribution heat source opening temperature and closing temperature of each region with heating provision according to the recommended basic heat source capacity coefficient α, draw that if heating temperature is 5°C, distribution heat source can not only reinforce the peak, but also run the valley in these regions which are colder than Yinchuan, but distribution heat source can only reinforce the peak in other regions.