**3. Design of Proposed System**

#### **3. Design of Proposed System** *3.1. Specifications of Exhaust Gas*

*3.1. Specifications of Exhaust Gas* The load of ICE changed from 70 to 90% at the current time in a day, so the load of ICE at 80% is chosen for the heat exchanger design and correspondingly the exhaust gas temperature is *teg in*<sup>1</sup> = 470 °C. From the technical specifications of ICE, the mass flow rate of exhaust gas *Geg* = 6000 kg/h. From the physical specifications of the used DO fuel, the sulfur concentration is *S* = 0.445%. From the graph of flue gas dew point temperature [36], the dew point temperature of exhaust gas is *tdp* = 110 °C. The reaction SO<sup>3</sup> + H2O = H2SO<sup>4</sup> in exhaust gas system which causes the corrosion in chimmy or on the surface of the heat exchanger at low ICE load is prevented. We choose the minimum exhaust gas temperature The load of ICE changed from 70 to 90% at the current time in a day, so the load of ICE at 80% is chosen for the heat exchanger design and correspondingly the exhaust gas temperature is *teg in*<sup>1</sup> = 470 ◦C. From the technical specifications of ICE, the mass flow rate of exhaust gas *Geg* = 6000 kg/h. From the physical specifications of the used DO fuel, the sulfur concentration is *S* = 0.445%. From the graph of flue gas dew point temperature [36], the dew point temperature of exhaust gas is *tdp* = 110 ◦C. The reaction SO<sup>3</sup> + H2O = H2SO<sup>4</sup> in exhaust gas system which causes the corrosion in chimmy or on the surface of the heat exchanger at low ICE load is prevented. We choose the minimum exhaust gas temperature *teg out*<sup>1</sup> = 130 ◦C. Thus, the total heat recovery from EGH of ICE can be determined:

$$\mathbf{Q}\_{\text{eg}} = \mathbf{G}\_{\text{eg}} \cdot \mathbf{c}\_{\text{pg}} \left( t\_{\text{eg }in1} - t\_{\text{eg }out1} \right) \tag{1}$$

where *cpeg* is the average specific heat of exhaust gas (*cpeg* = 1.174 kJ/kg °C). Thus, from Equation (1) *Qeg* = 665 (kW). where *cpeg* is the average specific heat of exhaust gas (*cpeg* = 1.174 kJ/kg ◦C). Thus, from Equation (1) *Qeg* = 665 (kW).
