Ingenieur Vol. 75 ingenieur July 2018-FA - Page 68

INGENIEUR utility meters for consumption data. Options available under this method are: Option C: Savings are determined by measuring energy use at the whole facility or sub facility level, but there are problems with this approach. (e.g. many types of ECMs in one facility, difficult to draw boundaries for each ECM and only one bulk meter available) Option D: Savings are determined by simulating energy use of the whole facility or sub facility. (e.g. for new buildings using software such as Integrated Environmental Solutions Virtual Environment (IES-VE), Energy Plus, etc.) Figure 2: Old chilled and condenser water pumps and piping CASE STUDY The Ministry of Works Complex (KKR) consists of three buildings, namely Block A (six storeys), Block B (13 storeys) and Block C (Hall). The project scope of the project, however, was limited to blocks A and B. The old systems are described as follows: Block A: 1. Chillers: 3 units at 260 Refrigeration Tonnage (RT) each; 2. Chilled water pumps: 3 units; 3. Condenser water pumps: 3 units; and 4. Switchboard: 1 unit. The pumps and piping are shown in Figure 2. Figure 3: One of the three existing B Block centrifugal chillers. Block B: 1. Chillers: 3 units. At 306 Refrigeration Tonnage (RT) each; 2. Chilled water pumps: 3 units; 3. Condenser water pumps: 3 units; and 4. Switchboard: 1 unit. The chiller plant room is as shown in Figure 3. The energy performance of the KKR Complex chilled water plant was audited in 2014. As a result, it was recommended that the existing chillers, chilled water and condenser water pumps should be retrofitted and upgraded. The fundi \؝Z[YHHZ[\Hو[\KܙY[XH[]\ UJH[HڙX\˜[ܙ[]YHH[\H[Z\[ۈX[^\XKHI\[܈H\X[[قH\[H\ۙHۈX\  M\[  Mˈ[[ۙH\[Y]\YX\\Y[ BMHSKTTSPTSH L NY\H [\ۚXY]\\[YB[Y]\\\[[]HH]\œ]K