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Published bySri Oesman Modified over 6 years ago
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Objectives Discuss HW5 – Plumbing Finalize valve design
Learn about boilers Discuss power generation
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HW5: Find a system curve for this plumbing configuration
40 ft 20 ft 20 ft Due date: May 5th 5 ft 200 ft 30 ft 30 ft 200 ft 40 ft 10 ton 30 ft 20 ft 10 ft 5 ft 5 ft 10 ft 10 ft 5 ft 30 ft 10 ft 5 ft 5 ft 10 ton HW5 – Design
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Valve Sizing and Flow Coefficient
Cv value: in liter/hour or…. in Pa Control Valve Selection For Hydronic Systems reference:
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Control Valve Selection For Hydronic Systems
Before Digital Control we tried to do this Valve authority
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Combined heat and power (cogeneration CHP or three generation CCHP)
Here, we use thermal energy for heating and/or cooling
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Power generation in steam turbines (Rankine cycle)
Pump Nuclear Coal
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Ideal Rankine Cycle 1-2 isentropic pump constant pressure heat addition 3-4 isentropic turbine constant pressure heat rejection
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Ideal Rankine Cycle h1=hf saturated liquid
Wpump (ideal)=h2-h1=vf(Phigh-Plow) vf=specific volume of saturated liquid at low pressure qin=h3-h heat added in boiler Usually either qin will be specified or else the high temperature and pressure (so you can find h3) qout=h4-h1 heat removed from condenser) wturbine=h3-h4 turbine work
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Deviations from Ideal in Real Cycles
Pump is not ideal Turbine is not ideal There is a pressure drop across the boiler and condenser We need to sub-cool the liquid in the condenser to prevent cavitation in the pump.
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Reheat Cycle It allows increase boiler pressure without problems of low quality at turbine exit
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Coal Boiler
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Coal burning method Long time ago: Today: 1) Fluidized bed:
2) Powdered coal:
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Coal-fired power plant filters
For Particulate Maters Electrostatic precipitator Filter bags Scrubber for SO2 (to prevent formation of Sulfuric acid – H2SO4) Grinded Limestone in water (slurry) sprayed into the gas fluid stream SO2 + Limestone slurry → Gypsum (used for wallboard)
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Oil – Gas based boilers Gas circulate through tubes
water is in-between Water tube boiler
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Furnaces For homes Roof tops and induct heaters
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