Hot spring thermal energy conversion (STEC) is a system that converts heat energy into electricity using the temperature difference between hot spring water and sea/river water. This paper describes dynamic model construction for the transient performance of STEC plant, which uses a recently developed power cycle with binary mixtures as working fluid. The mathematical models were constructed based on thermodynamics and structural features of the power cycle for representing the timely dependent state variables of the working fluid. Confidence in the accuracy of the developed models has been established by comparison of the simulation results with those obtained experimentally in a pilot STEC plant.

1.
Vadus, J. R., 1999, “Ocean Technology and Ocean Energy in the 21st Century,” Proc. the International OTEC/DOWA Conference’99, Imari, Japan, Saga University, Saga, Japan, pp. 10–22.
2.
Heydt
,
G. T.
,
1993
, “
An Assessment of Ocean Thermal Energy Conversion as an Advanced Electric Generation Methodology
,”
Proc. IEEE
,
81
(
3
), pp.
409
418
.
3.
Uehara
,
H.
,
Kusuda
,
H.
,
Monde
,
M.
et al.
,
1980
, “
Performance Analysis of Ocean Thermal Energy Conversion
,”
Therm. Nucl. Power
,
31
(
5
), pp.
549
559
(in Japanese).
4.
Uehara, H., Ikegami, Y., Mitsumori, T., Sasaki K., and Nogami R., 1999, “The Experimental Research on Ocean Thermal Energy Conversion Using Uehara Cycle,” Proc. the International OTEC/DOWA Conference’99, Imari, Japan, Saga University, Saga, Japan, pp. 132–135.
5.
Nakamura
,
M.
,
Ikegami
,
Y.
, and
Uehara
,
H.
,
1988
, “
Computer Simulation for OTEC System Design: Pump Control of Flow Rate
,”
Trans. Jpn. Soc. Refrig. Air Cond. Eng.
,
5
(
2
), pp.
247
253
(in Japanese).
6.
Janik, C. J. et al., 1998–1999, “Physical, Chemical and Isotopic Data for Samples From the Anderson Spring area, Lake County, CA, 1998–1999,” at http://geopubs.wr.usgs.gov/open-file/of99-585/.
7.
Uehara
,
H.
, and
Ikegami
,
Y.
,
1990
, “
Optimization of a Closed Cycle OTEC System
,”
ASME J. Sol. Energy Eng.
,
112
, pp.
247
256
.
8.
Uehara
,
H.
, and
Ikegami
,
Y.
,
1990
, “
Optimization of a Closed Cycle OTEC System
,”
ASME J. Sol. Energy Eng.
,
112
(
4
), pp.
247
256
.
9.
Nakamura
,
M.
,
Jitsuhara
,
S.
,
Isogai
,
H.
, and
Uehara
,
H.
,
1991
, “
Computer Simulation Developments for OTEC Plant Design and Control
,”
Trans. Soc. Instrument Control Eng.
,
27
(
1
), pp.
107
114
(in Japanese).
10.
Uehara
,
H.
,
Ikegami
,
Y.
, and
Nishida
,
T.
,
1998
, “
Performance Analysis of OTEC System Using a Cycle With Absorption and Extraction Processes
,”
Trans. Jpn. Soc. Mech. Eng., Ser. B
,
64
(
624
), pp.
384
389
.
11.
Kalina, A. I., 1987, “Regeneration of the Working Fluid and Generation of Energy,” Japanese Patent, Sho62-39660.
12.
Uehara, H., Ikegami, Y., and Nishida, T., 1995, “OTEC System Using a New Cycle With Absorption and Extraction Processes,” Physical Chemistry of Aqueous System, White et al., eds., Begell House, Washington, DC, pp. 862–869.
13.
Itoi, R. et al., 2001, “A Program Package for Thermal-Physical Properties of Fluids,” Kyushu University, Fukuoka, Japan, http://propath.mech.kyushu-u.ac.jp/.
14.
Nakaoka
,
T.
, and
Uehara
,
H.
,
1988
, “
Performance Test of Shell-and-Plate Evaporator for OTEC
,”
Exp. Therm. Fluid Sci.
,
1
(
3
), pp.
283
291
.
15.
Jones, J. B., and Hawkins, G. A. 1986, Engineering Thermodynamics, Jone Wiley and Sons, New York, pp. 661–707.
16.
Tanishita, I., 1998, Basic Thermodynamics, Shokabo Inc., Tokyo, pp. 319–322 (in Japanese).
17.
Yasui, S. (1977). Turbo Mechanics I, Jikkyo Inc., Tokyo, pp. 53–54 (in Japanese).
18.
Koury
,
R. N. N.
,
Machado
,
L.
, and
Ismail
,
K. A. R.
,
2001
, “
Numerical Simulation of a Variable Speed Refrigeration System
,”
Int. J. Refrig.
,
24
, pp.
192
200
.
You do not currently have access to this content.