Anticipated thermal efficiency of solar driven NH3/H2O absorption work producing units (EN)

Kouremenos, DA (EN)

Rogdakis, E (EN)

Antonopoulos, KA (EN)

A solar driven, work producing, NH3/H2O absorption cycle is considered, which has a theoretical efficiency 25% higher than the conventional H2O Rankine cycle working at the same temperature levels. At higher temperatures, the efficiency of a solar driven H2O Rankine cycle increases, but the corresponding decrease of the solar collector efficiency is quicker, thus resulting in lower overall efficiency. The NH3/H2O absorption cycle is simulated by a computer model which contains analytic functions describing the behaviour of the binary NH3/H2O mixture. Application of the model is made for operation during a typical year in Athens, with the solar radiation and ambient temperature data available from processing of related hourly measurements of 20 yr. The absorption unit is expected to produce a maximum theoretical specific mechanical power output of 80 W/m2-concentrator aperture at 13.00 h in June and July. A maximum theoretical daily mechanical energy of 1500 kJ/m2-day is anticipated for June. The theoretical total mechanical energy of the typical year is expected to be 339,406 kJ/m2-yr. For a 5-h use of this energy per day, the resulting yearly mean mechanical power is 50 W/m2. © 1991. (EN)

journalArticle (EN)

Physics, Nuclear (EN)

Thermal Conversion (EN)

Solar work production (EN)

Mechanical energy (EN)

Solar Power Plants--Efficiency (EN)

Energy & Fuels (EN)

Ammonia-Water Absorption Units (EN)

Thermodynamics (EN)

Solar Energy (EN)

Thermodynamics--Rankine Cycle (EN)

Thermal conversion (EN)

Mechanics (EN)

Absorption Cycles (EN)

NH3/H2O absorption unit (EN)

Εθνικό Μετσόβιο Πολυτεχνείο

Ψηφιακό Αποθετήριο της Κεντρικής Βιβλιοθήκης του ΕΜΠ | Dspace@NTUA

Κεντρική Βιβλιοθήκη Ε.Μ.Π.

Ιδρυματικό Αποθετήριο

Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά

Energy Conversion and Management (EN)

Αγγλική γλώσσα

1991 (EN)

http://hdl.handle.net/123456789/10371

111 (EN)

2 (EN)

ISI:A1991EQ42100002 (EN)

119 (EN)

31 (EN)

0196-8904 (EN)

PERGAMON-ELSEVIER SCIENCE LTD (EN)