With the acceleration of the global warming process and the shortening of the global abnormal climate occurrence cycle, sustainable development has attracted the attention of the whole world in today's population expansion, the destruction of the earth's environment, the depletion of resources and other issues. People began to reflect on the increasing development of construction projects. In the one hundred years since the
Industrial Revolution, the construction industry has a great impact on the environment. The construction industry is a “big energy consumer”. 50% of the global energy consumption lies in the building, and the energy consumption of HVAC accounts for 30%~50% of the building energy consumption, and increases year by year with the improvement of people's requirements for the quality of life. In the process of sustainable design, under the influence of various financial crises and energy crises, people reduce the energy consumption of buildings by reducing the fresh air volume, reducing the operation power of air conditioner, reducing the air volume of circulating fans and other measures.
However, while reducing energy consumption, it also reduces people's comfort level to the lowest limit. Energy consumption has decreased, but new problems have arisen and air quality is deteriorating. With the development of the construction industry, people's awareness level is constantly improving. HVAC professionals gradually understand that energy conservation and environmental protection should be organically unified. Therefore, with the minimum energy consumption, creating a healthy and comfortable indoor environment and protecting the atmospheric environment is exactly the requirements of the new building for HVAC specialty.
HVAC equipment is a huge and complex system engineering. As professional HVAC technicians, we must strictly grasp each process to ensure the normal use of the building's HVAC system.
The main content of this book includes: HVAC system, HVAC cold and heat sources, HVAC energy saving technology, HVAC system and equipment control energy saving, HVAC system automatic control and noise isolation, HVAC construction and installation basic knowledge, central heating equipment construction and installation process, HVAC engineering construction and installation process, refrigeration pipeline and equipment construction and installation worker, operation and commissioning of ventilation air conditioner and refrigeration system and anti corrosion and heat preservation of HVAC system.
This book can be used as a standing reference book and training book for staff of heating and ventilation engineering cost and relevant work, and also for teachers and students of relevant majors in vocational colleges.
In the process of compiling this book, many excellent books and relevant national standards have been referred to and used for reference, and the help of relevant staff has been obtained. Due to the limited knowledge and experience of the author, although the editor tries his best, there are still some omissions in the book. Experts and readers can criticize and correct them and it will be appreciated very much.
建筑业是个“耗能大户”，全球能耗的 50%在于建筑，而暖通空调能耗占建筑能耗的 30%～50%，并且随着人们对于生活质量要求的提高而逐年增加。在可持续设计的过程中，在各种各样金融危机、能源危机的影响下，人们以减低新风量，减小空调运行功率，降低循环风机风量等措施来降低建筑的能耗。但是，在能耗降低的同时，也把人们的舒适程度降低到了最下限。能耗下降了，但新的问题又产生了，空气品质在不断恶化。随着建筑业的发展，人们的认识水平不断提高，暖通专业人员逐渐明白，要把节能和保护环境有机地统一起来。因此，以最少的能耗，创造健康、舒适的室内环境，并保护大气环境， 这也正是新型建筑对暖通专业的要求。暖通空调设备是一个庞大而复杂的系统工程，作为专业的暖通技术人员，必须严格把握好每道工序，保证建筑物的暖通系统正常使用。
Infectious diseases are a kind of diseases caused by various pathogens, which can spread between people, animals or between people and animals. At present, China’s legally reported infectious diseases are divided into three categories: A, B and C, totally 39 species. In addition, it also includes other infectious diseases that National Health Commission of People’s Republic of China has decided to list in the management of B and C infectious diseases and other infectious diseases that carry out emergency monitoring reports in accordance with A management.
Infectious disease is a disease that can be transmitted from one person or other species to another through various ways. Usually, the disease can be transmitted through air, water, food, contact, soil and vertical transmission (mother to child transmission), etc. It can be transmitted through direct contact with infected individuals, body fluids and excreta of infected persons, and objects contaminated by infected persons.
Infectious diseases are characterized by ferocity, great harm, wide spread and great social impact. Since the beginning of history, human beings have been fighting against various infectious diseases. With the improvement of transportation level and the increase of floating population, the prevention of infectious diseases is no longer a simple prevention in a region or a country, but has been expanded to the world. The prevalence of SARS is still fresh in people’s memory.
In this book, the basic knowledge of infectious diseases and related research applications are introduced in detail, and a large number of the latest examples and data are used to explain, so as to make contributions to the cause of health education and prevention and control of infectious diseases in China as far as possible, and provide reference for the majority of infectious disease researchers, which is also the original intention of this book.
传染病(Infectious Diseases) 是由各种病原体引起的能在人与人、动物与动物或人与动物之间相互传播的一类疾病。中国目前的法定报告传染病分为甲、乙、丙 3类.共 39 种。此外，还包括国家卫生计生委决定列入乙类、丙类传染病管理的其他传染病和按照甲类管理开展应急监测报告的其他传染病。
传染性疾病的特点是来势凶猛危害性大，传播范围广，社会影响大。而从有历史记载以来，人类一直就在与各种传染性疾病作斗争。随着交通运输水平的提高，流动人口的增加，传染病的预防已不再是简单的某个地区或某个国家进行预防，现已扩大至全球。 SARS 的流行至今人们还记忆犹新。
The continuous development and progress of modern science and technology and management have promoted the development of measurement work in China’s enterprises, and the constantly changing social environment for measurement and measurement management work requirements are also constantly improving. The main purpose of this paper is to help measurement and measurement management workers to fully understand and master the modern measurement management knowledge and measurement management system, so as to adapt to the changing modern enterprise measurement work and better complete the modern measurement management and measurement management work.
Measurement is an indispensable part of the production and operation activities of enterprises, and also the basis of scientific management of modern enterprises. It plays an important role in improving product quality, ensuring safe production, realizing energy conservation and consumption reduction, protecting ecological environment, cost accounting, improving labor productivity, and maintaining the sustainable development of enterprises. In order to standardize and strengthen the measurement work of enterprises, so that it can meet the needs of the international and domestic market, we have compiled the book Research on Modern Measurement Management and Measurement Management System based on the successful experience of enterprise measurement work and the measurement requirements of market economy for many years, aiming to help and guide the measurement workers of enterprises to understand the current situation of measurement work at home and abroad and the development trend, grasp the basic knowledge and methods of the enterprise to carry out measurement work, and apply these knowledge and methods to the management activities of the enterprise, so as to improve the economic and social benefits.
With the development of the world economy and science and technology, the society has entered the information age, and the landscape architecture specialty in its development process, also in the information age has been an unprecedented development opportunity. And landscape architecture teaching can also be fully combined with information technology, through the virtual simulation technology to assist the teaching of landscape architecture design and construction, so that teachers and students can learn and practice the knowledge of landscape architecture more intuitively with the help of virtual simulation technology, and improve the teaching quality and efficiency of landscape architecture.
Modern garden teaching is of great significance to the cultivation of high-quality talents related to garden construction. Especially with the continuous development of modern science and technology, the bonus of technology and garden teaching is increasing. The emergence of virtual simulation technology provides a modern, intuitive and professional means for garden teaching. This paper discusses the development and construction requirements of landscape art and construction, and the innovation of landscape teaching under the background of virtual reality technology, so as to provide reference for the development of modern landscape teaching.
The economy will drive the development of many factors. For example, the development of urbanization depends on the economy. The development of urbanization is also affected by many factors. For example, the opportunities of infrastructure construction and transmission and distribution system engineering described in this paper affect the process of urbanization. Therefore, this paper introduces the situation of infrastructure construction and the understanding of transmission and distribution system engineering, so as to promote the development of urbanization faster. The progress of urbanization is a sign of economic development, and the degree of urbanization is determined by infrastructure construction and transmission and distribution system engineering.
In the past hundred years, science and technology have developed rapidly at an unprecedented speed, and the living environment of human beings has changed with each passing day. Science and technology have changed the mode and quality of human life, and the demand of life has also promoted the development of science and technology. As a basic industry, electric power industry shoulders the historical mission of serving the national economy and social development. It is of great significance to strengthen the popularization of science and technology in electric power industry, improve the scientific and cultural quality of the masses, promote the transformation of the mode of economic growth of electric power, and make the electric power industry rely on the progress and innovation of science and technology. Therefore, the popularization of science in electric power industry is also an important and urgent task for electric power workers.