how to generate barcode in asp net c# Pumps for Closed Energy Storage Systems in Software

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Pumps for Closed Energy Storage Systems
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Figure 174 Chiller location with respect to ice storage
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Pumps for Closed Energy Storage Systems Pumps for Closed Energy Storage Systems 465
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leaving water temperatures of 26 F and at around 090 kW/ton, while the other chiller could be making chilled water for the system at 44 F and at 060 kW/ton Another advantage of this arrangement is the ability of the chillers to operate at any desired load and maintain a constant leaving temperature as the ice is depleted Like other water systems containing glycol, these internal ice melt systems must be equipped with heat exchangers if it is desired to keep the glycol out of the chilled water system Figure 174a includes such a heat exchanger, while Figs 174b and c do not This is a decision for the designer and the client Generally, chilled water systems utilizing large air-handling systems do not require the heat exchanger, while systems with a number of small terminal units such as fan coil do require them
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175 Pumping Internal Ice Melt Systems The variable-speed pump offers some appreciable advantages in pumping internal ice melt systems because of the sizable changes in viscosity of the glycol solution as it varies from 26 to 55 F The variable-speed pump can be controlled by any desirable parameter such as flow through the chiller evaporator The flowmeter for this circuit provides a 4- to 20-mA signal to the pump controller that varies the pump speed and maintains the desired flow as the glycol temperature changes The friction loss in the various loops for this ice system varies as to whether ice is being used or bypassed The variable-speed pump automatically adjusts its speed to accommodate these variations caused by the control valves that determine the phase of operation for the energy storage system Further, as indicated in Fig 174b, the use of variable-speed pumps on the chiller circuit eliminates other pumps that might be required with heat exchangers or the ice storage itself
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1751 Pumps for internal ice melt systems
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This type of ice storage system requires a minimum of special provisions and controls for the pumping system, since it is a closed system where system pressures are easily controlled There should be no concern for cavitation in the pumps other than the usual precautions that should be taken for any system Most of the pumps for these systems are either single- or doublesuction volute-type pumps Standard bronze-fitted construction is very adequate for these applications
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Pumps for Closed Energy Storage Systems 466 Pumps for Closed HVAC Cooling Systems
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Many of the standard pumping and distribution systems for ordinary chilled water systems are usable with internal melt ice storage systems 176 Bibliography
ASHRAE Handbook Fundamentals, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Atlanta, Ga, 1993 Design Guide for Cool Thermal Storage, ASHRAE, Atlanta, Ga, 1993
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Source: HVAC Pump Handbook
Pumps for District Cooling and Heating
181 Introduction Although this chapter has been included in this part on pumps for closed cooling systems, district heating is included here because it is so similar to district cooling in layout and pumping Much of the following discussion on pumping district cooling can be applied to district heating systems Usually, district hot water capacities are much smaller than those for district cooling District cooling and heating is the name for the centralization of chilled and hot water plants that will supply water to a number of independent buildings District cooling and heating is increasing in popularity because of the cost advantages and efficiencies that can be achieved in the generation of the chilled water One of the important parts of these installations is the cost of moving the chilled water from the central energy plant to the buildings Pumping energy must be evaluated using computer programs to secure the optimal method of pumping Most of these systems have utilized primary-secondary pumping to distribute water to the buildings Primary-secondary pumping was explained in Chap 15, as was distributed pumping Distributed pumping is an alternative procedure for district hot and chilled water systems It uses the central energy plant water system pressure to distribute the water to the buildings As mentioned before, it is based on the Bernoulli theorem, which demonstrates that there are three different pressures in a water system, namely, static head, velocity head, and pressure head Any of these three can be used to move water through a system of
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