Applied Mechanics and Materials Vols. 170-173

Abstract: A heat pump is a kind of energy saving equipment. It can effectively improve the grade of low temperature renewable and waste energy. Because of the increasing demands for higher temperature energy in many industrial processes and other fields, the development and research of high temperature heat pumps have been becoming more and more pressing and significant. This paper briefly summarizes the development status in two aspects: the development of working fluids and system features and characteristics of different cycle types.

Abstract: A novel TPR simulated skin was applied in the system of thermal manikin and water cooling garment, and the satisfying result in improving the heat dissipating efficiency of water cooling garment was achieved. Firstly, five kinds of elastomer were selected as candidate simulated skin. To evaluate the synthetic performance of these materials, a series of experiments characterizing material's mechanical and thermodynamic properties was performed, including stiffness test, heat property test, TGA test and so on. Then, fuzzy mathematic method was employed to perform synthetic evaluation, which showed that TPR had satisfying optimization performance and can be used as simulated skin. Finally, to verify the function of TPR simulated skin to increase water cooling garment's heat dissipating efficiency, comparative experiments were performed in climate chamber. Results show that TPR simulated skin can effectively improve water cooling garment's heat dissipating efficiency measured by thermal manikin.

Abstract: Based on the temperature monitoring for the double U-tube wells with thermal resistance , numerical simulation researching on two-dimensional temperature field and three-dimensional temperature field was carried out for vertical double U-tube group. Under the condition of 6.5m for horizontal spacing of tube well, the Soil temperature around inner tube wells increases 0.4°C in one year, and 0.24°C for the surrounding tube wells. The paper calculates the increasing temperature of the tube wells, 7.95°C for inner tube wells and 4.70°Cfor surrounding tube wells. The soil temperature of tube wells is rising with the running time increasing, however,the temperature rate of the soil around inner tube wells is larger than the surrounding tube wells’.

Abstract: Heating and Air Condition, Pipe Network, VB,FORTRAN,Mixed Programming Abstract:As the scale of the air conditioning system is constantly increasing, some problems still exist and remain to be solved in the chilled water system. Among them, the leading problems lie in the insufficient research of the overall character on the user side and lack of simualtion analysis. Corresponding calculating procedures are Mixed programmed using VB and FORTRAN language to conduct to simulating analysis, to testify reliability and feasibility of the method.

Abstract: Combining construction monitoring of a PC continuous rigid bridge, research the effect of hydration heat in block number zero at construction stage and solar radiation effect in mid-span girder section at operation stage. In construction stage, central section of block number zero is observed for hydration heat effect and WZP-035 platinum thermistors is embedded for observing during the concrete deposit to 120 hours later. As observing, the maximum thermal gradient between inside and outside of box girder is 61.7 centigrade. On the other hand, the simulation result base on Ansys shows this maximum thermal gradient is 63 centigrade. In operation stage, the measuring point on the mid-span girder section is observed for continuous 17 hours under the high solar radiation and high temperature conditions. Ansys is also used to simulate the thermal stress in mid-span girder section. As a result, the stress concentration caused by the hydration heat and solar radiation should be highly valued.

Abstract: Cave dwelling is a traditional architectural form in the northern part of Shaanxi province. It is the product of local traditional culture and humanistic spirit, and corresponds with the requirements of energy-saving and sustainable development. This paper takes the traditional cave dwelling in the northern part of Shaanxi as the research object, and uses two kinds of methods: the analysis of the literature data and on-the-spot investigation to put forwards the traditional ventilation design strategies of cave dwelling construction in the northern part of Shaanxi province, which aims to explore the new methods of reforming traditional cave dwelling construction.

Abstract: Natural ventilation is suitable for application to workshops with heat sources to keep good indoor air quality at lower energy cost. In this paper, the authors numerically investigated the buoyancy-driven natural ventilation in a workshop with heat source based on computational fluid dynamics (CFD) method. The effect of the distance between heat source and ground on the air flow and temperature distribution was examined. Results showed that the average air temperature at operation zone could be effectively reduced when the distance between heat source and ground increased. The temperature field in the upper zone of the workshop was improved by diminishing the hot air zone near the ceiling and the waste heat directly going into the operation zone decreased when the distance between heat source and ground increased.

Abstract: Based on practical applications of WSHP (Water Source Heat Pump) system, equipment selection, operation management, economic performance of the system, etc. have been analyzed and expounded All of our work is helpful and valuable for peer reference.

Abstract: With the development of the heating industry, the higher level of operation and management are required. Therefore it needs more accurate values of nodes pressure and flow. In this paper, based on the genetic algorithm, In order to realize the improved algorithm, change the rate of cross and mutation according to the fitness. After revising the resistance characteristic coefficient, we can get the more accurate values of nodes pressure. Finally, an example is given to verify the feasibility and validity of this method.

Abstract: Stability is an important measurement index of reticulated shell structure to security and reliability. Considering the temperature change, using structural buckling analysis in ANSYS, the stability of reticulated shell structure was invested. Analysis shows that stability of reticulated shell structure affected by temperature change impact; as the temperature goes down, the safety factor (stability coefficient) continually decrease. The conclusion showed that: 1) reticulated shell construction is suitable in summer; 2) Insulated curing of shell should be paid attention in cold season, and which will be useful on design, construction and use of structure.