ENG790S2 Combustion Based Thermal System Assignment Sample

• Subject Code : ENG790S2
• Subject Name : Energy Conservation and Management

Energy Systems

Discussion and Analysis of Combustion Based Thermal System

After doing the analysis of the combustion based thermal system .It goes into the following paths. The air and fuel mixed in the combustion chamber and heat is produced this heat is goes in to the Heat exchanger via tube at where heat transfer is taking place to the surround via convection and conduction. It has been found that if we use the insulation to the pipes then the amount of heat loss can be reduced. Then it goes into the heat exchanger in this case two case has been analyzed first for parallel and cross flow heat exchanger. The cross flow heat exchanger proves good performance.

• Mass flow rate of CH4:- 39 Kg/s
• The stoichiometric air fuel ratio of Methane = 17.2 : 1
• Mass flow rate of air:- = 23.908 Kg/ s
• Mass Flowrate of Exhaust gases :- 3 Kg/s
• Qout:- 49979 Kj/Kg
• Tout = 3043 o c
• Convective heat transfer Coefficient :- 37060 W / m2 K
• The heat rate is :- 10591851.38 w/m
• Heat rate with insulation:- q’ = 468.71 w/m
• Outlet temperature of Gas after transportation:- Tso = 3034 oc
• The effectiveness for parallel-flow:- E = 0.27
• For cross-flow, the effectiveness can be taken from Figure :-E= 34
• The rate of heat transfer is
  1. For parallel-flow : -26234602.75 W
  2. For cross-flow :- 33036166.42 W
• The outlet temperatures for Parallel Flow :-
  1. Tgout = 2215.45 oc
  2. Twout = 79 ^oc
• The outlet temperatures for Cross Flow :-
  1. Tgout = 2006.42 ^oc
  2. Twout = 95 ^oc
• After taking 5 % Variation :-
• The effectiveness for parallel-flow:- E = 0.24
• For cross-flow, the effectiveness can be taken from Figure :-E= 32
• The rate of heat transfer is
  1. For parallel-flow : - 23319646.75 W
  2. For cross-flow :- 31092862.52 W
• The outlet temperatures for Parallel Flow :-
  1. Tgout = 2308.45 oc
  2. Twout = 72.01 ^oc
• The outlet temperatures for Cross Flow :-
  1. Tgout = 2066.42 ^oc
  2. Twout = 92.68 ^oc

After taking the variation of the 5 % in mass flowrate of air and fuel as well as in dimensions od heat exchanger. It has been found that the Heat transfer rate is significantly reduce because the effectiveness of the heat exchanger is reduces. This results in can also be seen on the outlet temperature of the system.

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