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The efficiency of boilers and chillers should not be compromised in an effort to save pumping energy Here lies one of the major responsibilities of the water system designer, who must evaluate various connections and pumping arrangements to acquire the optimal configuration for a particular system
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Zone 2: Transportation of energy Once the hot or chilled water has been generated, it must be moved out to the heating or cooling coils Combining the pumps for this transportation with the pumps for the boilers or chillers may or may not improve the efficiency of the entire water system Often, the most efficient system of delivering the water to the end uses is to develop the transportation pumps strictly for the purpose of distributing the water and not to generate the energy A number of different pumping and piping arrangements are provided herein to assist the designer in selecting the most efficient system for a particular water system Zone 3: Use of the energy Water in hot and chilled water systems is used by hot and chilled water coils, heat exchangers, and process equipment Most of these energy users are equipped with a control valve to regulate the flow of water through them Some coils are operated without control valves and are called wild coils They are often equipped with face and bypass dampers that control the use of energy by them The water flows continuously through the coil, and the air flows around the coil on low heating or cooling loads Wild coils should not be used on systems with high pumping heads and broad load ranges due to the pumping energy wasted by them Some designers use these coils on outside makeup air to prevent freezing in the coil There are other methods to prevent freezing besides wild coils that control the flow and therefore conserve pumping energy The other problem with these uncontrolled coils is the return of the water unused to the boilers and chillers This raises the return water temperature on hot water systems and lowers the return water temperature on chilled water systems Much will be made of different coil connections to develop the efficiencies or inefficiencies of the various systems that are used in HVAC systems today It is obvious that the three-way valve on a heating or cooling coil is a wasteful device like the wild coil with a face and bypass damper Water is bypassed around the coil and returned to the boiler or chiller unused Sizing of coils from a standpoint of water friction loss is becoming a very detailed task From a standpoint of pumping energy, if the coil is sized with too great a friction drop, energy is wasted If the coil is
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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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The Use of Water in HVAC Systems 226 The HVAC World
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sized with a low velocity in the tubes and low friction loss, laminar flow develops and excessive water flow results The designer must balance the selection of coils between high water pressure loss and laminar flow The flow of water in the coil should not pass into the laminar range at any known load on the coil How well we use hot or chilled water will determine the efficiency of operation of the entire water system Hot and chilled water systems are described together here, because there is so much similarity between hot water and chilled water coils in their use and in their connections Hot and chilled water coil connections must be studied in detail to ensure that the supply water is being used efficiently There are a number of ways to connect these coils, and many are being advocated in the HVAC industry Some of them are being sold to solve a particular system problem The system problems that are being addressed with these connections are: 1 Laminar flow in coils 2 Dirty coils water side, air side, or both 3 Improperly sized coil control valves or valve actuators 4 Poorly constructed control valves
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