Study On The Design Of Energy Saving Collective Housing In Western China By Radiation

Since the 1980 s,the energy-saving goal of residential buildings in China has been gradually improved.As the main type of residential buildings in China,collective housing is the top priority to achieve the goal of energy saving.In this context,the energy-saving benefits brought by increasing the thickness of thermal insulation materials are gradually weakening,and the high-performance exterior windows are restricted by high costs.At present,the energy consumption of buildings can be saved economically and effectively by making full use of radiation energy through architectural design.However,due to the unclear relationship between various radiation utilization design measures and energy-saving objectives,the application situation in energy-saving design of collective housing is not good Good.The western region of China is rich in solar radiation resources,most of which belong to severe cold and cold regions.The energy consumption of collective housing heating accounts for a large proportion of its total energy consumption.It is a new idea to realize the goal of energy saving in China to use radiant heat gain to save the energy consumption of collective housing.In this paper,three cities with different climate characteristics,energy demand and energy-saving design requirements of collective housing in the western region are taken as typical representatives.Among them,Xining is extremely cold in winter and cool in summer,while Lhasa is not cold in winter and hot in summer.Both of them take the maximum use of radiant heat to reduce heating energy consumption as the energy-saving design goal,without considering the problem of heat prevention in summer.Turpan is cold in winter and hot in summer,so it is necessary to take into account the energy demand in winter and summer when using solar radiation.Based on the data investigation,the radiation utilization design measures adapted to the climate characteristics of the three cities are summarized.The dynamic energy consumption simulation software Designbuilder is used to simulate and analyze the influencing factors of radiation utilization design along with the design process,so as to assist the design decision-making,complete the optimization design scheme of the collective housing in three cities,and compare and analyze the energy-saving effect of solar radiation heating Rate.The main conclusions are as follows1.Among the three cities,Lhasa has the highest energy-saving rate by using radiation.41% energy-saving rate can be achieved by designing sunlight room(window to wall ratio of 0.6).Turpan project achieves 30.6% energy-saving rate through zigzag heat collection and storage wall design.Xining area can not meet the 30% energy-saving goal only through radiation utilization design,and the thermal performance of enclosure structure needs to be improved The energy saving rate brought by the thickness of thermal layer is 7.7%,and the energy saving rate by using radiation through architectural design is 22.3%.2.Through the simulation analysis,the heating energy consumption of the three urban collective houses decreases with the increase of the south facing window to wall ratio,but in Xining and Lhasa projects,the excessive south facing window to wall ratio will cause local overheating problem.The total energy consumption of the two cities is the lowest when the south facing window to wall ratio is 0.5.On the basis of the original scheme,the energy saving rates are 6.5% and 25.5% respectively.In Turpan project,the increase of south facing window to wall ratio will reduce the building heating energy consumption and increase the cooling energy consumption in summer.Through simulation analysis,the total energy consumption of the whole year is the lowest when the south window to wall ratio is 0.45.3.In Turpan project,the energy-saving law of zigzag heat storage wall and horizontal fixed sunshade is studied.The design parameters of the scheme with the lowest total energy consumption in the whole year are as follows: the zigzag angle of the zigzag heat storage wall is 130 ° and the length of the horizontal sunshade from the window is 1200 mm.The final scheme achieves 30.6% energy saving rate.In this paper,taking the design of collective housing in three typical cities in Western China as an example,the energy-saving laws of design measures of Radiation Utilization in different regional climate are summarized by dynamic energy consumption simulation method,and the effective methods of energy-saving design of collective housing are explored from the perspective of radiation utilization.