5 = Angsana UPC7 Engineering Technology and Major Projects Demonstrate the Water-cooled Screw Chiller Performance Conversion Equation and Application Cai Wenqing is based on the heat balance of the chiller compressor evaporator condenser, cooling water tower and pump joint working point. Through the theoretical derivation and verification of a large number of test data, the cooling capacity of condensation heat, which reflects the characteristics of the unit, was established, and the equations of the cooling capacity and the heat of condensation of the temperature and water quantity of the outlet water temperature of the condenser were calculated. For a screw chiller of a given type, only the single condition test can be used to determine that the unit can be used under any conditions. The amount of cooling and condensation heat. The establishment of the characteristic conversion equation makes the tedious and power-consuming thermal performance test of the unit changed to a single condition test. Model number, with the help of cold and condensation heat conversion equation, can provide the user with variable performance parameters and various characteristic curves for this type of unit. The introduction of the characteristic conversion equation provides a reliable basis for the equipment selection of design units and users. At present, some manufacturers fail to provide the unit with completeness to the user, which brings great inconvenience to the design department in the selection of the unit, which makes some of the users of large carts serious, resulting in no waste of initial capital and operating expenses. With the characteristic conversion equation, the user can simply and accurately convert the required cooling capacity under design conditions into various types of the unit nameplate. The cold screw type can be provided under the operating conditions. The chiller characteristic conversion equation is based on the joint Shanghai Carrier. Air-Conditioning Co., Ltd. provided 30 steals, 8 models, 231 series 4 model units and Daikin Air Conditioning Co., Ltd., three series of models, 07 series of three models of the measured data of the unit, to verify the above characteristics of the equation, the results Significantly, the error between the converted value and the measured value is much smaller than the error range allowed by the test. This article is the result of research and application of the air conditioning and refrigeration equipment characteristics of key research projects in Fujian Province. Professor of School of Fisheries, engaged in refrigeration and air-conditioning teaching and research work, successively hosted and better completed two provincial natural science fund projects, is currently presiding over the key scientific research projects issued by the Provincial Science and Technology Commission. Address: Room 301, Building 8, Water Institute, Jimei University, Xiamen, Fujian Province, China, 361021; Electro-hydraulic excavator and national infrastructure Ding Jiasheng The development and current status of China's excavator industry. Excavators are of the highest importance for their wide application and high value in construction machinery. The excavator is the main construction machinery for earth and stone excavation. It is widely used in the construction of energy-conserving irrigation and water conservancy towns, as well as mechanized construction in modern military engineering and other fields. China's excavator manufacturing industry has a history of more than 40 years. There are more than 30 existing production enterprises, including 10 Sino-foreign joint ventures and wholly foreign-owned enterprises. It can produce various types of hydraulic excavators with bucket capacities from 0.15 to 5.43. About 5,700 units, plus imports of mobile phones, mainly mobile phones, estimated annual sales of about 10,000 units. At present, Sino-foreign joint ventures wholly foreign-owned enterprise products and imported machines have accounted for a large share of the market. The development of the national economy demands the excavator. China is a developing country with a vast number of people and a large number of people. All construction is in the ascendant. In recent years, the state has increased the investment in infrastructure construction, and now it has made a deployment of the western development. For a long time to come, there will be a large number of engineering construction tasks in the areas of highways and railways port airports, energy conservancy, farmland mines, ecological environment, and urban housing construction. These economic construction and national defense construction require a large number of hydraulic excavators. And in many construction occasions, the demand for a variety of work equipment excavators will greatly increase. It is estimated that the domestic demand for excavators will be 1,000,500 units in the first two years, and the demand in 2005 will be about 14,000 units. Domestic capital excavator industry should actively participate in market competition. Through more than 40 years of independent development and technology introduction, the technical level of China's excavators has been greatly improved, forming a certain scale. China's hydraulic excavator industry has been in an international competition since 1995. China's domestic capital excavator companies are currently in a very difficult situation, but they still have a living environment and development space. It is to change the operating mechanism, do a good job of adjusting the industrial structure and adjusting the quality of the workforce. It is the use of international modern technology to renovate the product and continuously introduce new models with high reliability, good price, low maintenance, good appearance, and comfort. Marketing concepts and service concepts, compete for market share with joint-venture-owned enterprises' products, and develop new products such as economical tire-type machines for various uses under various natural conditions to meet the needs of multiple levels and multiple levels. Technology Center. Mechanical activation method, a composite material and its thermal expansion behavior Jia Chengchang Zhu Xunzhi Zhao Jun Jie Zizhang M0CU alloy has good thermal conductivity, high hardness and other properties, so it has been widely used in electrical and electronic fields. With the high power performance of electrical products and semiconductor devices
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