Xem 1-20 trên 23 kết quả And air conditioning units
  • This is a thorough revision of the definitive, classic text for any level course on refrigeration, refrigeration and air conditioning, and environmental control in buildings. It is an equipment-oriented textbook that applies theoretical results of engineering theories to refrigeration and air conditioning engineering problems. This enables the student to understand both common and uncommon problems in designing, selecting and applying air conditioning and refrigeration components and systems.

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  • SUBCOURSE OD1750 EDITION A REFRIGERATION AND AIR CONDITIONING IV (EQUIPMENT COOLING) ..REFRIGERATION AND AIR CONDITIONING IV (EQUIPMENT COOLING) Subcourse OD1750 Edition A United States Army Combined Arms Support Command Fort Lee, VA 23801-1809 14 Credit Hours INTRODUCTION This subcourse is the last of four subcourses devoted to basic instruction in refrigeration and air conditioning.

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  • The purpose of this manual is to provide the reader with a fundamental understanding of controls and how they are applied to the many parts of heating, ventilating, and air conditioning systems in commercial buildings. Many aspects of control are presented including air handling units, terminal units, chillers, boilers, building airflow, water and steam distribution systems, smoke management, and indoor air quality.

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  • The purpose of this manual is to provide the reader with a fundamental understanding of controls and how they are applied to the many parts of heating, ventilating, and air conditioning systems in commercial buildings. Many aspects of control are presented including air handling units, terminal units, chillers, boilers, building airflow, water and steam distribution systems, smoke management, and indoor air quality. Control fundamentals, theory, and types of controls provide background for application of controls to heating, ventilating, and air conditioning systems. ...

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  • The scope of this subcourse takes in unit components of the absorption system, including their functions and maintenance; water treatment methods and their relationship to centrifugal systems; centrifugal water pumps and electronic control systems, including the relationship of amplifier, bridge and discriminator circuits to electronic controls. The subcourse consists of three lessons. Lesson 1. 2. 3. Direct Expansion and Absorption System. Centrifugal Systems and Water Treatment. Centrifugal Water Pumps and Electronic Control Systems.

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  • There are 4 million miles of roads in the United States. One hundred years ago, roads were primarily unpaved and had half the number of miles of the present U.S. road system. As the system grew, roads became wider and more complex structurally to provide for more and heavier traffic. New construction technology and greater structural stability were needed to improve the road system. All phases of road development—from construction and use by vehicles to maintenance—affect physical and chemical soil conditions, water flow, and air and water quality.

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  • The forced air HAC system is located off the dining area with a single return grille located in a panel of the HAC system closet. The HAC system consists of a 10.6 kW air conditioning unit and a furnace with a power input of 22.6 kW and output of 18.2 kW. The design airflow rate of the furnace fan is 470 L s -1 . A thermostat controls system operation, but the air distribution fan can be operated continuously if desired. There are local exhaust fans in the bathrooms and kitchen and a whole-house exhaust fan in the...

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  • I would like to recognize those who have helped to bring this project to fruition, for it is through the help of many different individuals that the conception and completion of this work was possible. Foremost, I acknowledge the National Science Foundation (grant no. 9912271) for funding this project. I would like to express my gratitude to my husband, Greg Wilson, whose support and encouragement kept me going daily. Greg helped in so many ways, from proofreading my writing and trouble- shooting my ideas to calming me down and installing an air-conditioning unit in my office.

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  • HEATING, VENTILATING, AND AIR CONDITIONING ECONOMICS OF INTERIOR CLIMATE CONTROL 16.2 Equations for Heating, Ventilation, and Air-Conditioning Calculations Required Capacity of a Unit Heater Determining Cooling-Tower Fan Horsepower Requirements 16.12 Choosing an Ice Storage System for Facility Cooling 16.13 Annual Heating and Cooling Energy Loads and Costs 16.22 Heat Recovery Using a Run-Around System of Energy Transfer 16.24 Rotary Heat Exchanger Energy Savings 16.26 Savings from ‘‘Hot-Deck’’ Temperature Reset 16.28 Air-to-Air Heat Exchanger Performance 16.

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  • By definition, air conditioning involves control of the air temperature, humidity, cleanliness, and distribution. It follows that an air-handling unit (AHU) of some kind is an essential part of an air conditioning system, though not necessarily of a heating-only system. The function of the AHU is to provide air at a quantity, temperature, and humidity to offset the sensible and latent heat gains to the space (in the cooling mode) and the heat losses (in the heating mode), while maintaining the required temperature and humidity in the space....

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 16 HEATING, VENTILATING, AND AIR CONDITIONING ECONOMICS OF INTERIOR CLIMATE CONTROL 16.2 Equations for Heating, Ventilation, and Air-Conditioning Calculations 16.2 Required Capacity of a Unit Heater 16.58 Determining Cooling-Tower Fan Horsepower Requirements 16.12 Choosing an Ice Storage System for Facility Cooling 16.13 Annual Heating and Cooling Energy Loads and Costs 16.22 Heat Recovery Using a Run-Around System of Energy Transfer 16.24 Rotary Heat Exchanger Energy Savings 16.

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  • h The air-conditioning is based on a supplementary equipment kit for the Audi A4. It is driven by a 3.8kW electric motor (400V, 3-phase). The painted stator is equipped with steering brake rollers and has a 12V battery under the air-condition unit and a storage compartment for measuring equipment. The unit is already filled with coolant and can be oprated without additional equipment. All the test connections for measurements exists. The 12V and 400V switch can be locked, two keys are supplied.

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  • IN BOTH NATURAL AND AGRICULTURAL CONDITIONS, plants are frequently exposed to environmental stresses. Some environmental factors, such as air temperature, can become stressful in just a few minutes; others, such as soil water content, may take days to weeks, and factors such as soil mineral deficiencies can take months to become stressful. It has been estimated that because of stress resulting from climatic and soil conditions (abiotic factors) that are suboptimal, the yield of field-grown crops in the United States is only 22% of the genetic potential yield (Boyer 1982).

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  • Trigeneration. The combination of gas engines with absorption chillers is an optimal solution for generating air conditioning and/or refrigeration. The waste heat from the mixture intercooler, the engin oil, the engine cooling water, and the exhaust gas serves as drive energy for the chillers. Combining a cogeneration plant unit with an absorption refrigeration system allows utilization of seasonal excess heat for cooling.

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  • The air-conditioning is based on a supplementary equipment kit for the Audi A4. It is driven by a 3.8kW electric motor (400V, 3-phase). The painted stator is equipped with steering brake rollers and has a 12V battery under the air-condition unit and a storage compartment for measuring equipment. The unit is already filled with coolant and can be oprated without additional equipment. All the test connections for measurements exists. The 12V and 400V switch can be locked, two keys are supplied.

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  • The USFS Forest Inventory and Analysis (FIA) program seeks to assess the condition and trend of the forests of the U.S. FIA recently assumed responsibility for all former Forest Health Monitoring program (FHM) plot work on a national level, and is currently active in 32 states. Lichen community monitoring was included in FIA in order to address key assessment issues such as the impact of air pollution on forest resources, spatial and temporal trends in biodiversity, and the sustainability of timber harvesting.

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  • Like most metropolitan areas on the U.S.–Mexico border, Paso del Norte, comprised principally of Ciudad Juárez, Chihuahua, and El Paso, Texas, has experienced exceptionally rapid population and economic growth during the last several decades. 1 Between 1990 and 2000, Ciudad Juárez’s population grew by about 50% (from 0.8 million to 1.2 million), while El Paso’s population grew by about 16% (from 0.6 million to 0.7 million), rates approximately twice those for Mexico and the United States (Desarrollo Econόmico de Ciudad Juárez 2002, Economist 2001).

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  • ADC’s Apparatus Cases are designed to protect local loop electronics from a variety of environmental conditions. The air-filled units can be pressurized locally or from the main feeder cable through an air core stub. This air core stub protects the air-filled unit from flooding with water when it is mounted in underground manholes. The gel-filled units are intended for aboveground pole mounting applications.

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  • Functions of an air conditioner: A. temperature control B. air conditioning C. odor removal D. germicidal treatment E. noise control F. air motion G. relative humidity II. Spaces: Auditoria Commercial offices 3. Apartments 4. School class rooms Motels Example: In an auditorium, the three most important functions of an air conditioner are to control the temperature, to remove odour and to control noise

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 12 REFRIGERATION Refrigeration Required to Cool an Occupied Building 12.1 Determining the Displacement of a Reciprocating Refrigeration Compressor 12.4 Heat-Recovery Water-Heating from Refrigeration Units 12.6 Computing Refrigerating Capacity Needed for Air-Conditioning Loads 12.12 Analysis of a Compound CompressionRefrigeration Plant with a WaterCooled Intercooler and Liquid Flash Cooler 12.47 Computation of Key Variables in a Compression Refrigeration Cycle with Both Water- and Flash-Intercooling 12.

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