INGENIEUR
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 funding was obtained from the Ministry of Energy , Green Technology and Water ( KeTTHA ) and the project was co-ordinated by the Energy Commission Malaysia .
The M & V process prior to the dismantling of the old system was done on March 30 , 2017 to April 7 , 2017 . Among the parameters measured in
Figure 4 : Ultrasonic flow meters fastened to the chilled water pipes to calculate the water flow rate .
66 VOL 75 JULY-SEPTEMBER 2018