Cost benefit analysis of a cooling energy storage system

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Power; (United States)

OSTI ID:5445178

Chen, C S; Sheen, J N ^[1]

---

1. National Sun Yat-Sen Univ., Kaohsiung (Taiwan, Province of China). Dept. of Electrical Engineering

Since the air conditioner (A/C) load contribute 30% of the peak demand of Taiwan Power Company (Taipower) system during the summer season, load management by clipping A/C load has become one of the most important topics in Taipower system. Since the eutectic salt is a complete inorganic compound with freezing point at 47 F and latent heat 41 Btu/lb, it is a good medium for the energy storage system. It this paper, an A/C system with 1,800 RT-HR eutectic salt energy storage tank was built on the campus of National Sun Yat-Sen University (NSYSU) for the demonstration of the cooling energy storage (CES) system. Six operation modes of the CES-system are designed to meet different cooling load requirements. By computer simulation, it is found that 41.1% of the electric peak demand has been reduced and 56% of the energy consumption has been shifted from peak hours to off-peak hours by the CES-system. In this paper, the mathematical model of an eutectic salt CES-system has been developed for the computer simulation of the energy storage system. It is found that the optimal capacity of the storage tank is determined by the off-peak time period and the largest annual electricity charge saving could be obtained by applying the smallest nominal chiller size under the optimal operating conditions. According to the results of the computer simulation and the field test, the payback period of the test system is estimated to be 3.6 years by considering the additional investment cost and the electricity charge saving of the CES-system.

• OSTI ID: 5445178
• Journal Information: Power; (United States), Journal Name: Power; (United States) Vol. 137:11; ISSN POWEAD; ISSN 0032-5929
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250600* -- Energy Storage-- Thermal
COST BENEFIT ANALYSIS
ECONOMIC ANALYSIS
ECONOMICS
ENERGY STORAGE
ENERGY STORAGE SYSTEMS
ENERGY SYSTEMS
HEAT STORAGE
LATENT HEAT STORAGE
LOAD MANAGEMENT
MANAGEMENT
OFF-PEAK ENERGY STORAGE
STORAGE