Qing Hua Wang

The Research on the Combination Methods of Solar Collectors and Building Roof

The building environment and the building roof structure of buildings are different from each other. This causes the different combination methods of solar collectors and building roof. The outlook of solar collectors and the methods of waterproof and insulation are various. These factors will contribute to the diversification of forms of solar water heaters. This paper describes several combination methods of solar collectors and building roof and the corresponding waterproof and insulation methods. Based on existing combination methods and in the premise to ensure the safety and functionality, a more simple and economical combination method was put forward - combination structure of industrial aluminum and its accessories. It can meet the requirements of the industrialization of constructional installation and building integrate in our social.

Security Analysis of Solar Building in Extreme Weather

In order to prevent the solar heater falling off the roof in extreme weather and spread the solar building technology, this paper gave a feasible inclination and new connection for collectors used in slope roof and ridge in cold district. The reliability of connection was analyzed under snowstorm and fierce wind condition. The results showed that raising the inclination angle of heater 3°higher than local latitude was beneficial to ensure the security of collector and to reduce the energy consumed by buildings. In the event that the whole load has acted on a single expansion in combined load condition, it remain contained 286% safety margin, while safety margin was up to 415% under fierce wind circumstances individually. It is obvious that the connection is quiet suit for installing heaters on the roof without forethought pedestals.

Research on the Construction Technology of Radial Underground Heat Exchanger and its Heat Exchange Performance

5 radial heat exchange wells were designed, and the different angle drilling, drilling pipe, and grouting backfill construction technology was studied. In addition, the heat transfer performance of the buried radial heat exchange wells was tested. The results show that, design of pipe equipment is feasible, construction is convenient, and the ratio of backfill material is reasonable; the heat transfer performance of 90 °buried tube is the best. The smaller the angle with the ground heat exchanger, the greater the heat exchange performance is affected by the surface temperature.

Setting for the Application of Phase Change Paraffin in Block Masonry

This paper studies the insulation properties of masonry filling paraffin composite phase change material. With high density polyethylene (HDPE) as wrapping materials and solid-liquid mixing paraffin as phase change materials, solid-liquid mixed paraffin phase change material with different amount of admixture is prepared, and the problem of flowing after paraffin phase change is then solved. The phase change temperature and the phase change latent heat of composite phase change material with different amount of admixture are tested. The results showed that the composite material with 30% of 52 # solid paraffin, 70% of liquid paraffin, 70% of HDPE coating performs best as to the phase transition temperature and latent heat. On this basis, This paper studies the composite phase change wall with phase change materials 0%, 33%, 66% and100%. Results show that the composite phase change material wall’s heat preservation performance has significantly improved. the temperature fluctuation range of internal and external wall surface is 4.2 °C lower than unfilled wall.

Research on the Properties and Application of the New Lightweight Composite Insulation Wall Panel

One kind of engery-saving lightweight composite insulation wall panel is exploited. It can benefit of waste, effectively reduce the structural weight and can be easily to install. Comparing with ordinary concrete wall on thermal property, reveals that the lightweight composite insulation wall panel has better insulation property. Combine with the other properties and engineering applications, pointe out that the properties of the panel meet the National energy efficiency standards and the summer and cold winter energy efficiency design standards requirements of China.

Properties Research on Concrete Laminated Beam Combined with GRC Enhanced Reinforcement Template

This paper introduces a stressed member which is composited of GRC enhanced reinforcement template combined with post-pouring concrete structure. The GRC template is as a permanent template combining with concrete into a composite beam. The surface of the template is respectively dealed in different ways. Through contrasting the results of stress performance experiment with ordinary beam,studing the cooperative performance between GRC templates and post-pouring concrete, as well as the effect of bearing stress of composite beams with templates in different treatment ways. The optimal size is diameter 15mm, depth 5mm from the experiment.

Effect of glass fiber reinforced cement (GRC) and styrene-butadiene emulsion on the property of cement mortar

The compressive, flexural strength and splitting tensile strength of cement mortars modified by glass fiber reinforced cement (GRC) (0∼3% mass fraction) or/and styrene-butadiene emulsion (0∼8% mass fraction) at the ages of 3, 28, 90 days were tested, and the impact performance for 28 days cement mortar was also studied. According to this experimental conditions and the results of this study, it can conclude that the fiber can greatly improve the impact property and flexural strength of the styrene-butadiene emulsion modified cement mortar. And the more content of fiber, the better effect get in general.

Experimental study of cast-in-situ concrete composite beam with wire mesh permanent formwork

In this paper, through the combination of wire mesh panel and glass fiber reinforced cement (GRC), a kind of permanent formwork was made for the reinforced concrete beam, which can be kept in place after the construction is set, and then poured normal concrete on the precast permanent formwork to making a mixed structure component. The mechanics properties and produce process of the new component were introduced. The behavior of different component ratio were tested and compared with the normal concrete beam in the bending test. In the meantime, the bonding effect before and after the specific treatment was analyzed. The study indicates that the bearing capacity of WCL specimen is less than CL specimen by 6%, and the formwork and concrete is separated easily under a certain loading value.