Q1/ A fuel contains by mass 88% C, 8% H2, 1% S and 3% ash (silica). Calculate: i. The stoichiometric air and A/F stoichiometric ii. If the air supplied is 20% more than the stoichiometric value, find the A/F and the analysis of the dry products by mass.

air at dry ball temperature 90 ° C and RH 8% is passed over the cooling coil so that the air dry ball temperature becomes 45 ° C. How much heat is released from the air in the process? = answer (kJ / kg)

The density 0f dry air at 0.9866 bar and 27.0 oC is 1.146 g dm-3. Calculate the c0mp0siti0n of air assuming 0nly N2 and O2 to be present. [answer: 0.755; 0.245]

20 kg of foodstuff initially has a moisture content of 450% (dry basis). This material is dried to a moisture content of 10% (wet basis). Determine how much water is removed from the material? = kg.

7. For the following possible alternative fuels, express the higher heating value (HHV) and lower heating value (LHV) in Btu/gal (a) n-Decane (C10H22), density 6.09 lb/gal, Ho -249.4 kJ/mol (b) n-Heptane (CH16), density 5.71 lb/gal, Ho -187.9 kJ/mol (c) n-Hexane (CaH14), density 5.51 lb/gal, Ho -167.4 kJ/mol

______ m

A fully charged battery contains 0.02 kmol Ag₂O (silver oxide) and 0.02 kmol Zn (zinc). The battery is initially at a temperature of 21°C. The fully charged battery is then discharged for half an hour under adiabatic conditions (no heat leaves the system). During the half hour of being discharged, the electric current from the battery does 200 kJ of work external to the battery system (none of this external work heats the battery). During this half hour, 0.001 kmol of both reactants are consumed in the net cell discharge reaction: Please see the following table for heat capacities and heats of formation. The heats of formation below show the amount of energy (kJ) needed to form one kmole of each component. If the heat of formation is negative, then forming that species releases energy (to do work or provide heat). Therefore, to create one kmole of silver oxide 29000 kJ energy is released and is generated in the battery (for work or heat), and if one kmole of silver oxide decomposes…

Estimate the thermal properties of a food with the following composition: carbohydrate 0.4%, protein 0.6%, fat 81.0%, ash 2.5%, moisture 15.5%. a. Specific heat is based on the equation Siebel = AnswerkJ / kg ° C. b. Specific heat according to the equation Charm = AnswerkJ / kg ° C. c. Specific heat is based on the equation Heldman & Singh = AnswerkJ / kg ° C. d. Specific heat is based on the equation Choi & Okos = AnswerkJ / kg ° C. e. Heat conductivity is based on the equation Sweat = AnswerW / m ° C. f. Heat conductivity is based on the Choi & Okos = AnswerW / m ° C equation. g. Heat diffusivity based on the Choi & Okos = Answerm² / s equation.

A countercurrent tunnel dryer is used to dry apple slices from an initial moisture content of 65% to 5% (wet basis). Hot air enters at 95 ° C with 1% RH, and exits at 52.0 ° C. If the product temperature along the dryer is 20 ° C and the solid specific heat of the product is 2.2 kJ / (kg ° C), determine the rate of hot air required to dry the wet product at a rate of 200 kg / hr. Determine the RH of the dryer exhaust air. a. Drying air rate (ma) = kg / hr. b. RH of dryer exhaust air =%

1500 1400 1300 1200 1100 Cu 2 PROBLEM 3 50 1270 °C (i) Define liquidus and solidus temperatures. (ii) Determine the mass fraction of each phase in the Cu-40% Ni alloy at 1270 °C. 20 40 Caffs and notifications will vibrate Weight percent nickel The equilibrium phase diagram for the Cu-Ni system is shown in Figure. . 58