Tham khảo tài liệu 'advanced gas turbine cycles episode 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | xvĩĩĩ Notation continued Symbol Meaning Typical Units H w temperature difference ratios in heat transfer - - X isentropic temperature ratio - y velocity ratio - polytropic expansion index - A B c. D E F K fC constants defined in text various a proportions of capital cost - a - p 1 t c 0 - 1 also capital cost factor - y Cp cv - 8 loss parameter - E heat exchanger effectiveness also quantity defined in eqn. - I cost of fuel per unit of energy kWh V efficiency - see note below - 0 ratio of maximum to minimum temperature - A area ratio in heat transfer also CƠ2 performance parameter - kg kWh M scaling factor on steam entropy ratio of mass flows in combined cycle lower to upper - V non-dimensional heat supplied v or heat unused vUN - M. r. T parameters in cycle analysis - p density kg m T T min max also corporate tax rate - l cooling air mass flow fraction - 4 temperature function J 0 also turbine stage loading coefficient kJ kg K - Ơ expansion index defined in text - K constant in expression for stagnation pressure loss - Subscripts a a b b c d e e f f states in steam cycle a A bl B c cot c CAR cc CP CG cs cv d dp air relating to heat rejection artificial efficiency blade temperature boiler relating to heat supply cooling air combustion temperature compressor isentropic efficiency Carnot cycle combustion chamber efficiency or loss combined plant general cogeneration plant control surface control volume debt dewpoint Notation xix continued Symbol Meaning Typical Units D e E demand maximum efficiency also equity also external electrical unit price also exit from turbine and from first turbine stage f H fuel gas higher upper topping relating to heat supply work output HL HR JB i between high and lower plants rejection from higher plant Joule-Brayton cycle inlet IJB k L LR max min m NU o o p p P lit R REV s irreversible Joule-Brayton cycle product gas component also year number k 1 2 . lower bottoming relating to heat supply work output rejection from lower plant
