Advanced Materials Research Vols. 1008-1009

Abstract: Airpak was applied to numerically simulate the air distribution under the same air supply temperature ,different air supply velocity (3.6m/s、2.7m/s and 1.8m/s ) and air supply angle (+15°、-45° and-75°) , and evaluate thermal comfort by Comparative analysis velocity fields, temperature fields, PMV—PPD. The results show that different air supply velocity and air supply angle have a significant impact on indoor air distribution under the same air supply temperature. Air supply angle Plays a vital role in pattern and distribution of indoor flow field,air supply velocity mainly effect the magnitude of indoor velocity and temperature. Synthetically comparied, the model’s best supply parameters are supply velocity 2.7m/s and supply angle75°,which mean value of indoor PMV is-0.09, PPD is 8.5%.

Abstract: This paper takes a large public building in large space as an example, comparative analysis of two case designs chosen to calculation the amount of air handing units wind turbine volute section with plug fan and conventional centrifugal fan, the results show that using plug fan not only has high efficiency, small size , low operating cost, but also through the closure of a number of plug fan and using frequency conversion technology to achieve energy saving.

Abstract: Basing on coupled thermal conduction and groundwater advection conduction, this paper analyzed the effects to the temperature field and the stress field caused by the Vertical U-tube exchange used in ground source heat pump. And then this paper analyzed the relationship between heat influence radius and thermal conductivity and groundwater advection velocity. Also, we obtained the simple formula which can estimate the heat radius of influence. Basing on coupled thermal conduction and solid mechanics analyzed the stress field caused by thermal expansion. The results show that: without groundwater advection, the heat radius of influence linear correlate to the thermal conductivity; the radius will obviously expand when the groundwater advection velocity is not too small; the stress field caused by thermal expansion near the U-tube is much larger than the farther region and it will trends to balance with the distance increasing.

Abstract: Using finite-time thermodynamics, optimal analysis on a class of four-heat-source refrigerator for Newton’ heat transfer law is done based on the ecological objective function. The ecological optimal performances of refrigerator are derived. An ecological optimization criterion is proposed for the best mode of operation of the refrigerators, which consists of maximizing a function representing the best compromise between the cooling rate and entropy production rate. We investigate the ecological optimization performance and derive the optimal cooling rate, coefficient of performance and entropy production rate for the refrigerators. Moreover, there are some advantages in using the ecological optimization criterion; it is especially beneficial for determining the reason able use of energy and protecting the ecological environment. The conclusions obtained here are of importance in the optimal design and reasonable use of the energy of real four-heat-source refrigerators, such as absorption refrigerators, adsorption refrigerators, and so on.

Abstract: The causes of greater energy loss for throttling in the fan and pump were analyzed, and the principle of frequency control in energy saving were analyzed on the basis of the similarity theory, too. To export the relationship between the power saving rate and flow, the relationship between the energy consumption of throttling regulation and flow were described. Comparison between frequency control and throttling regulation in changing the flow shows that motor frequency control applied in pump and fan is an efficient way to save power. It confirms that under meeting the similarity condition, the power saving rate of theoretical calculation is consistent with the measured data.

Abstract: Cogeneration is regarded as an important approach to probe new profit increase and achieve the long term goal of sustainable development. In the present paper, cases of heating rebuilding for units with different capacities are analyzed. Additionally, four cogeneration bases on the energy cascade utilization are proposed, which makes full use of the extracted steam heat, flue gas waste heat and low pressure cylinder exhaust steam condensation heat. The proposed technical approaches for cogeneration have the merits of excavating energy saving potential in depth and achieving economic benefits to the maximum value. Under the increasingly stringent circumstances of energy conservation and emissions reduction policies, accelerating the implementation of the technical proposals for heating rebuilding of thermal power units has promising applications and benefits.

Abstract: According to the current development situation of valve used in domestic cryogenic vessel and the level of product quality, through comparison and analysis similarities and differences of cryogenic vessels with the technical standards in cryogenic property inspection technology at home and abroad, then put forward to the basic requirements and key technical indicators for cryogenic property test aspects of cryogenic vessels with valve, provide suggestions for the establishment of national standard for cryogenic vessels with valves in China.

Abstract: High voltage switch mechanical parameters include time parameters, travel parameters and velocity parameters. In this paper, a standard device is developed which use liner motor to simulate switch motion that realize time parameters, travel parameters and velocity parameters calibration. This article describes the working principle of the standard device and core technology. The calibration data verify the device performance parameters meet the design requirements.

Abstract: Based on the colorimetric theory and combined with the production process of glass industry, a color-difference measurement system was designed. The system was applied to online color-difference detection for coated glass. Scanning measurement of color-difference based on spectroscopy was detailed, and the technologies of light source modulation and signal demodulation synchronization were introduced into the system. This avoided using sensor masks or soft curtain to eliminate backlight interference. Under the light source with fluctuations and other background noise, the new system can get robust measurement values. The experimental results show that the anti-interference method smooths the curve of color-difference, and improves the signal-to-noise ratio. The system meets the demands of practical color-difference testing, and provides a new method for online color measurement with high accuracy.

Abstract: Stochastic simulation using authors’ empirically-specified deterministic model estimates technical risk, i.e. failure risk. Simulating a crack growth in hydrogenating and stress cycling high-strength steels requires a great computing performance. Cloud computing based on Microsoft Azure enables authors to provide a lot of required calculations to complete design tasks in appropriate time to ensure safety operation of the structure component under consideration. Obtained results illustrate benefits of using cloud computing for stochastic simulation of crack growth in high-strength steels in comparison with the same calculations executed on a workstation. The article emphasizes the prospects of cloud computing applications to technical risk management.