Advanced Materials Research Vols. 594-597

Abstract: In order to improve indoor air quality, the effect of ventilation mixed coefficient on main filter efficiency was analyzed. A mass balance equation for a well-mixed space was built. Some design equations for determination the main filtration efficiency was introduced. Because the air mixing is not perfect, the formula of air filter efficiency calculation on heterogeneous model was deduced. In addition, the relationship between ventilation parameters and the main filter efficiency was also analyzed. Through numerical calculation, the main filter efficiency under different heterogeneous coefficient is calculated. The results show that when the heterogeneous coefficient between 0.6 and 0.8, the main filter efficiency can take 1.30 to 1.80 to correct.

Abstract: According to the actual operation of the pick sewage-source heat pump system established by the equivalent of heating, refrigerating capacity sewage equation of lanzhou city sewage contain energy are calculated.

Abstract: The present thesis employs VC++ program technique and digital simulation to design and develop simulation for auxiliary boiler system on ships based on PC desktop. The thesis aims to help students to grasp the operation of auxiliary boiler system expertly in connection with the restraining factors on safety and economy existing in real teaching and training. The results of analog simulation and application show that: Simulation for auxiliary boiler system on ships is capable of simulating the operation and control process of real one; it is convenient for students to master the characteristics and grasp the common faults of auxiliary boiler system; it helps to elevate students’ level of maintenance and management so that the safety operation of machines on ships can be better secured.

Abstract: The sales volume of vertical air conditioner in China mainland has developed rapidly. The researches in the field to the operation of vertical air conditioner are lacked since it is hardly to analyze different kinds of operating condition. Computational Fluid Dynamics (CFD) has been applied in engineering with the advance of the computer science and technology. In this article, both temperature and air flow distributions were analyzed to a meeting room which putted a vertical air conditioner. The model was used and the equations for numerical simulation (e.g. energy, residual, continuity, etc) were chosen as second order to get the higher accuracy. The results to simulation were showed reasonable and could offer a reference to the practical.

Abstract: The pebble thermoregulation system in greenhouse bottom corner is put forward according the characteristics of greenhouse structure and higher energy consumption. The indoor temperature of the pebble thermoregulation greenhouse is monitored in the course of experiment and the temperature change law of greenhouse bottom corner and greenhouse middle is analyzed and heat storage of pebble thermoregulation system is calculated. The results showed that heat storage of pebble thermoregulation system is higher, it is has important theoretical and realistic significance for greenhouse heating in winter.

Abstract: According to the characteristics of non-uniform temperature distribution in the seeding greenhouse, a pebble thermoregulation system in the bottom corner of greenhouse was put forward. The changes regularity of indoor greenhouse temperature with outdoor weather conditions was studied according to monitoring the date of experimental greenhouse, which was a pebble thermoregulation greenhouse and contrast greenhouse with same structure, such as indoor temperature and out temperature, etc. The results showed that temperature distribution between greenhouse bottom corner and greenhouse middle is uniform and the temperature difference is less than 1°C.

Abstract: In this paper, a numerical heat and moisture transfer model (HMTM) and a pure conduction model (PCM) were established separately for unsaturated soil around the ground heat exchanger (GHE) and were numerically solved by finite volume method. The simulation results indicate that rejecting heat into soil can reduce moisture content in the vicinity of the borehole wall. When the initial moisture content is high, moister transfer has little effect on soil thermal properties. In this case, the results of the HMTM and the PCM are basically identical. On the contrary, when the initial moisture content is low, the thermal effect has significant influence on moisture transfer around the borehole wall, and the soil thermal properties will change correspondingly. In this case, there is a large difference between the results of these two models.

Abstract: Greenhouse temperature of the three different types was measured under sunny winter weather conditions. The variation regularity of greenhouses temperature with outdoor temperature was studied according to the monitoring data of experimental greenhouse, which was different roof and floor structure. The results showed that the greenhouse temperature of the herringbone roof construction higher than the greenhouse of the serration roof construction; the greenhouse temperature of the serration roof construction is higher than the greenhouse of arch roof construction. Through analysis of temperature variation on the different type greenhouse, it will provide theoretical basis to construct greenhouse in different areas.

Abstract: This paper put forward some advantages of natural gas power generation, in the views of power generation efficiency and environmental protection perspective, compared with common fossil fuel power generation, and through comparing the economy, we elaborate the superiority of natural gas power generation. Simultaneously, there brings in the new technology of catalytic combustion in gas generation, which would improve power generation efficiency and reduce pollution in industrial fields. We also propose the corresponding solution to salve the difficulties encountered by the technology promotion, so as to achieve Low carbon energy saving.

Abstract: The physical processes triggering the fluid flow within the stressed rock are highly complex and not fully understood. The granite sample obtained from Creighton mine, Canada, was subjected to the temperature-pressure effects using a special rock mechanic testing machine equipped with a high precision gas monitor. It is shown that when the sample approached to the peak stress during the uniaxial compression test, the connective cracks instantaneously occurred accompanied by a swarm of AE activities, which suddenly decrease the fluid pore pressure. This change can be able to drive the gas back to the newly emerging crack due to the formation of gas pressure gradient within the damage zones. It is indicated that the different permeabilities among the zones can dominate the suction-exhaust proceeding of pore fluids within rock mass. Beyond the volumetric strain at null, the deformation of the stressed rock leads to a reversely change in pore pressure of closed pores. The feature for the gas emission determined by the changes in pore structure of rock is also discussed and analyzed.