6.Hl APPENDIX VI.H THE BRAYTON HEAT PUMP CYCLE VI.H.l: LIST OF SYMBOLS AND CONST.Z\.NTS P output rad P thermal Pheat into pump Pcompideal Pcomp P comp loss P turbideal upper and lower pressures in ideal Brayton cycle temperatures at numbered stages in Brayton cycle pressure in hull pressure in external radiator power output to space by radiation from external radiator electrical power to run heat pump power taken from hull by the heat pump (in the form of heat only) power needed by ideal compressor = efficiency of actual compressor power needed by actual compressor 1 ncomp Pcompideal power released as heat due to compressor inefficiency power produced by ideal turbine efficiency of actual turbine power produced by actual turbine
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