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The Case of a Residence Community

 

【Basic Information of the Residence Community】
■The community comprises D block and E block. D block includes 4 11-storey buildings, and E block includes 4 18-storey buildings. The community is designed for 712 resident families, with an underground garage and a community club.
■The community is supplied by 1 line of 10kV power with unsectioned single busbar. A set of diesel generators is installed as backup power.
■The community is of level 2 for power use.
 
Former Planning of Power Supply for the Residence Community
■The transformation and distribution power station is installed at the underground garage, to supply power to each building by low-voltage cables.
■2 dry-type transformers are installed.
■The radius of low-voltage power supply is about 150 meters on the average.
 
Integrated Planning for the Residence Community
■The community stil is supplied by 1 line of 10kV power that forms trunk power supply.
■1 Chinese-type transformer substation (outdoor) with small volumn is installed for each building in the community.
■A diesel generator is installed at the underground garage as a backup power to supply for each building by low-voltage cables.
■The radius of low-voltage power supply is about 20 meters on the average.
 
【Investment and Operation Comparison of Former Planning with Integrated Planning of Power Supply】
 
Table 1 Investment and Operating Losses

Project Planning
Costs of High-Voltage and Low-Voltage Equipments
Total Costs of Cables
Total Costs of Projects
Total Annual Losses
(Transformers plus Cables)
Total Annual Operating Costs ①
10,000 Yuan
10,000 Yuan
10,000 Yuan
10,000 Yuan kWh
10,000 Yuan
A
B
C
D
E
Former Planning
30.3
73.3
103.6
15.7
11.7
Integrated Planning
54.5
33.8
88.3
12.0
9.0
Ratio
180%
46%
85%
77%
77%

NOTE: (1) The percentages in the table are values of data of integrated planning divided by the former planning of power supply.
    (2) The total annual operating costs① are calculated by 0.75 Yuan per kWh.
    (3) The labor costs and installation costs are not included.
 
Table 2 Comprehensive Economic Evaluation of Energy Efficiency

Operating Time
5 years (10,000 Yuan)
10 years (10,000 Yuan)
Type of Planning
0.75Yuan per kWh
0.75Yuan per kWh
Former Planning
(CT=CI+CP)
CI
103.6
103.6
CP
58.5
117.0
CT
162.1
220.6
Integrated Planning
 (CT=CI+CP)
CI
88.3
88.3
CP
45.0
90.0
CT
133.3
178.3
Ratio
82%
81%

 
NOTE: 1. CI, costs of equipments and main materials 2. CP, costs of losses. 3. CT, total costs 4. Ratio, the percentage of data of integrated planning divided by the former planning of power supply
From the comparison above, integrated planning for the factory can be characterized as following:
■The total project costs are 85% of those of the former planning, saving 103.6-88.3=15.3 (10,000 Yuan)
■The total annual losses and total operating costs are 77% of those of the former planning, saving 11.7-9.0=2.7 (10,000 Yuan) per year;
■The comprehensive efficiency evaluation for 5-year operating costs: CT can be saved by 162.1-133.3=28.8 (10,000 Yuan) (calculated by 0.75 Yuan per kWh);
■The comprehensive efficiency evaluation for 10-year operating costs: CT can be saved by 220.6-178.3=42.3 (10,000 Yuan) (calculated by 0.75 Yuan per kWh);
■The total project costs for 10-year operating are 88.3 (10,000 Yuan), saving 42.3 (10,000 Yuan).

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