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The Case of the Expanded Campus of a University
【Basic Information of the Expanded Campus】
■The planning is applied to the expanded campus of a university, which covers an area of 173,000 square meters, including the building land of 100,000 square meters. The expanded campus comprises Vocational and Technical College and Vocational College of Art.
【Former Planning of Power Supply】
■High-voltage power is from 10kV outer lines.
■The entire campus is supplied by an European box-type transformers substation with 3 dual transformers.
■The radius of low-voltage power supply is about 200 meters.
【Integrated Planning】
■The expanded campus is supplied by medium-voltage power which directly closes to the user terminal.
■3 Chinese-type solid insulator switchyards and 8 Chinese-type transformer substaions (outdoor) are installed.
■The electric power system combines ring main power supply with trunk power supply.
■The radius of low-voltage power supply is about 30 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 Project
|
Total Annual Losses
|
Total Annual Operating Costs①
|
|
(Transformers plus Cables
|
|||||
|
10,000 Yuan
|
10,000 Yuan
|
10,000 Yuan
|
10,000 Yuan kWh
|
10,000 Yuan
|
|
|
A
|
B
|
C
|
D
|
E
|
|
|
Former Planning
|
281.0
|
102.2
|
383.2
|
30.6
|
18.4
|
|
Integrated Planning
|
258.6
|
44.0
|
302.6
|
16.9
|
10.2
|
|
Ratio
|
92.0%
|
43.0%
|
79.0%
|
55.2%
|
55.4%
|
NOTE: (1) The percentages in the table are values of data of integrated planning divided by those of the former planning.
(2) The total annul operating costs① is calculated by 0.6 Yuan per kWh.
(3) Labor costs and installation costs are not included.
Table 2 Comprehensive Economic Evaluation of Energy Efficiency for 5-Year Operating and 10-Year Operating
|
Operating Time
|
5 Years (10,000 Yuan)
|
10 Years (10,000 Yuan)
|
|
|
Type of Project
|
0.6 Yuan per kWh
|
0.6 Yuan per kWh
|
|
|
Former Planning
(CT=CI+CP)
|
CI
|
383.2
|
383.2
|
|
CP
|
92.0
|
184.0
|
|
|
CT
|
475.2
|
567.2
|
|
|
Integrated Planning
(CT=CI+CP)
|
CI
|
302.6
|
302.6
|
|
CP
|
51.0
|
102.0
|
|
|
CT
|
353.6
|
404.6
|
|
|
Ratio
|
74.4%
|
71.0%
|
|
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 those of the former planning.
From the comparison above, integrated planning for the university can be characterized as following:
■The total costs of project are 79.0% of those of the former planning, saving 383.2-302.6=80.6 (10,000 Yuan)
■The total annual losses and total operating costs are 55.4% of those of former planning, saving 18.4-10.2=8.2 (10,000 Yuan) per year;
■The comprehensive efficiency evaluation for 5-year operating costs: CT can be saved by 475.2-353.6=121.6 (10,000 Yuan) (calculated by 0.6 Yuan per kWh);
■The comprehensive efficiency evaluation for 10-year operating costs: CT can be saved by 567.2-404.6=162.6 (10,000 Yuan) (calculated by 0.6 Yuan per kWh);
■The total project costs for 10-year operating are 302.6 (10,000 Yuan), saving 162.6 (10,000 Yuan).
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