how to generate barcode in asp net c# Figure 166 Circuits for heat reclaim from closed condenser water systems in Software

Encoder QR Code in Software Figure 166 Circuits for heat reclaim from closed condenser water systems

Figure 166 Circuits for heat reclaim from closed condenser water systems
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Figure 166 (Continued)
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Closed Condenser Water Systems Closed Condenser Water Systems 455
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168 Geothermal Systems Geothermal systems offer new means of increasing the coefficient of performance (COP) for water source heat pumps They will become feasible for many installations as the cost of energy increases Today, the economics for these systems is determined by the actual job conditions, such as the cost of drilling wells or locating pipes in lakes or streams along with energy costs Pumping these systems is quite simple with variable-speed pumps Unfortunately, the early systems incorporated primary/secondary pumping, Fig 167; there is absolutely no need for constant flow in the wells
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DP controls pump speed DP Water source heat pumps
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Figure 167 Geothermal heat pumps installation with primarysecondary pumping
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Closed Condenser Water Systems 456 Pumps for Closed HVAC Cooling Systems
Figure 168 describes the correct pump and piping arrangement for a low-rise building while Fig 169 does so for a high-rise building The pumps should be installed on the discharge of the wells on the highrise installation to keep the pump head off the wells For example, if you have a high-rise building with a height of 300 ft, the static pressure on the wells would be 130 psig If the pumps have a shutoff head of 120 ft (52 psig), the maximum pressure on the wells would be 182
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Figure 168 Geothermal heat pump installation for low-rise bldg
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Closed Condenser Water Systems Closed Condenser Water Systems 457
DP controls pump speed DP Water source heat pumps Expansion tank and water makeup
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Figure 169 Geothermal heat pump installation for high-rise bldg
psig if the pumps are located on the return piping instead of on the supply, as shown in Fig 169 These water systems are very elementary and consist of just supply and return headers, coil piping and control valves, and service valves; there is no need for balance valves or other energy-wasting devices If the water source heat pumps have control valves that do not have a high differential pressure rating, reverse return piping can be utilized as shown in Fig 163
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Closed Condenser Water Systems 458 Pumps for Closed HVAC Cooling Systems
Most geothermal systems to date have utilized water source heat pumps as the terminal units The development of the modern twopipe system has resulted in a more efficient geothermal heating and cooling system that is applicable to typical facilities such as elementary and secondary schools These systems use VAV boxes and unit ventilators; this is described in Chap 31 and Fig 316 169 Storage of Hot Water The reclamation of heat from chillers has so many interesting possibilities that there may be cases that justify the storage of excess heat rather than waste of the heat through a closed-circuit cooler or a cooling tower Open storage of hot water would, as far as pumping is concerned, be very similar to cold water storage, as described in Chap 13 1610 Summation Closed-circuit condenser systems offer many different possibilities for energy-efficient systems The energy audits require substantial calculations and the consideration of a number of different circuits Energy storage in the form of chilled or hot water also can play a part in these systems From a pumping standpoint, the variable-speed pump offers so much flexibility without balance valves or pressureregulating valves and without any excessive pumping pressure The closed condenser system will become much more popular than it is today because of the heat-recovery possibilities What better method of plume abatement of cooling towers is there than to prevent the heat from getting to the closed-circuit cooler or cooling tower 1611 Bibliography
James B Rishel, Variable Water Volume Is Hydro-Electronics, SYSTECON, Inc, West Chester, Ohio, 1986 Cooling Tower Fundamentals, 2/e, The Marloy Cooling Tower Company, Mission, Kan, 1985
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