Acompression ignition engine is to be modeled using the ideal air-standard diesel cycle using constant specific heat (use cp = 0.240 [btu/(lbm r) and k = 1.4). this engine has a compression ratio of 20 and 400 [btu/lbm] are added during the heat addition process, and the state 1 temperature and pressure are 100°f and 15 [psia], respectively. calculate a)-the temperature and pressure after compression b)-the temperature and pressure after heat addition c)-the cutoff ratio d)-the thermal efficiency e)-the mean-effective pressure

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c