The juice with a dry matter concentration of 40% and an input yield of 1500 kg/h was indirectly heated in a saturated steam heat exchanger at 125°C. Calculate the amount of steam required for the system to heat from a temperature of 300C to a final temperature of 1000C. Assume the system is stable and the specific heat capacity of the juice does not change during heating.

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