*2.2. Description of Proposed System*

The system diagram of proposed hot water supply system based on hot water demand and EGH recovery from ICE to produce hot water was proposed is shown in Figure 2. The EGH of ICE is not directly used to produce the hot water for resort in order to restrain the scale inside the tube exchanger. The EGH of ICE is exchanged with intermediate heat

source (primary hot water), thus this system has two hot water circles. In the primary circle (closed circle), the fresh water is pumped into the primary heat exchanger and is heated by hot exhaust gas from ICE. This hot water becomes the heat source for the secondary circle. In the secondary circle (opened circle), the water is heated by primary hot water to temperature of 55 ◦C, then is pumped to the hot water system of the hotel and distributed to all rooms. The part of hot water with decreased temperature which is not used will be returned to the heat exchanger and reheated again. The make-up water is pumped to the system to compensate the part of used hot water. source (primary hot water), thus this system has two hot water circles. In the primary circle (closed circle), the fresh water is pumped into the primary heat exchanger and is heated by hot exhaust gas from ICE. This hot water becomes the heat source for the secondary circle. In the secondary circle (opened circle), the water is heated by primary hot water to temperature of 55 °C, then is pumped to the hot water system of the hotel and distributed to all rooms. The part of hot water with decreased temperature which is not used will be returned to the heat exchanger and reheated again. The make-up water is pumped to the system to compensate the part of used hot water.

The system diagram of proposed hot water supply system based on hot water demand and EGH recovery from ICE to produce hot water was proposed is shown in Figure 2. The EGH of ICE is not directly used to produce the hot water for resort in order to restrain the scale inside the tube exchanger. The EGH of ICE is exchanged with intermediate heat

**/Day) Ratio (%)**

*Symmetry* **2021**, *13*, x FOR PEER REVIEW 5 of 15

**Table 3.** Volume flow rate and its ratio with maximum value per day.

Average (*Vhwa*/d) 52 100 Maximum (*Vhwmax*/d) 94 180 Minimum (*Vhwmin*/d) 22 42

**Hot Water Volume Flow (m<sup>3</sup>**

*2.2. Description of Proposed System*

**Figure 2.** Proposed hot water supply system based on hot water demand and EGH of ICE. **Figure 2.** Proposed hot water supply system based on hot water demand and EGH of ICE.
