how to generate barcode in c# net with example Basics of Pump Application for HVAC Systems 322 The HVAC World in Software

Creation QR Code in Software Basics of Pump Application for HVAC Systems 322 The HVAC World

Basics of Pump Application for HVAC Systems 322 The HVAC World
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Pump relief valve connections
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HVAC pumps should be long-lasting with very little repair Proper installation and operation will provide many years of operation with a minimum of service and repair 1013 Bibliography
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James B Rishel, The Water Management Manual, SYSTECON, Inc, West Chester, Ohio, 1992 James B Rishel, Variable Volume Pumping Manual, Systecon Inc, West Chester, Ohio, 1982
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Source: HVAC Pump Handbook
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Pumps for Open HVAC Cooling Systems
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Source: HVAC Pump Handbook
Open Cooling Tower Pumps
111 Introduction Most of the air-conditioning systems in the HVAC industry or process cooling systems having a net cooling capacity in excess of approximately 4,000,000 Btu / h (333 tons) transmit the heat load to the atmosphere evaporatively through an open cooling tower Evaporating a pound of water removes around 1000 Btu from the remaining water This equates to about 1 percent of the water flow being evaporated to cool the balance of the water over a temperature difference of 10 F at design conditions This is in contrast to the once-through water cooling systems (100 percent makeup), in which only 10 Btu are removed when 1 lb of water is cooled 10 F Cooling towers were developed to take the place of lakes and spray ponds, which required considerable space to accomplish the same amount of evaporative heat transfer The cooling tower industry prospered as system owners and operators were told that water was a valuable commodity that should not be wasted Once-through water cooling systems have been outlawed in many parts of the world Since the evaporative process depends on wet-bulb temperature, a water-cooled refrigerant condenser is significantly more efficient than an air-cooled condenser The air-cooled condenser must be designed for the highest dry-bulb temperature that will be encountered on each specific application Cooling towers have been the subject of much research to achieve the most efficient operation and the maximum amount of capacity per cubic foot of tower volume Cooling towers are normally rated in tons of cooling, 12,000 Btu/ton Alternate ratings are in gallons per
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Open Cooling Tower Pumps 326 Pumps for Open HVAC Cooling Systems
minute with a specific temperature difference between inlet and outlet temperatures A detailed description of cooling tower performance is beyond the scope of this book This chapter will be devoted to the piping and pumping of cooling towers and chiller condensers and how their performance affects cooling tower pumps and vice versa The next chapter will deal with process cooling using cooling towers and other equipment For a detailed description of the thermodynamics of cooling towers and a comprehensive discussion of the various types of cooling towers, the reader is encouraged to study Cooling Tower (Chap 36 of the Systems and Equipment volume of the ASHRAE Handbook for Heating, Ventilating and Air-Conditioning, 2004 Obviously, there are a number of different arrangements of cooling tower fill and air patterns to achieve the most efficient and economically feasible cooling tower for the many different sizes and types of HVAC and industrial installations Table 111 is a general graphic representation of the type of towers currently being used in these industries Basically, a cooling tower is simply a container in which water and air both flow together Most often the airflow is either forced (pushed) or drawn (pulled) through falling water Usually, the
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