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Status
Electronic Resource
Call number
Publication
COO 2839 3 Volume 1; Report; April 1979.
Language
Library's review
ABSTRACT:
The objective of this project was the conceptual design of a Central Solar Receiver Gas Turbine Plant which utilizes a high temperature heat pipe receiver. Technical and economic feasibility of such a plant was to be determined and preliminary overall cost estimates obtained. The second
A heat pipe receiver is ideally suited for heating gases to high temperatures. The heat pipes are essentially loss free "thermal diffusers" which accept a high solar flux and transform it to a lower flux which is compatible with heat transferred to gases. The high flux capability reduces receiver heating surface, thereby reducing receiver heat losses.
An open recuperative air cycle with a turbine inlet temperature of 816°c (1500°F) was chosen as the baseline design. This results in peak metal temperatures of about 87o0 c (1600°F). The receiver consists of nine modular panels which form the semicircular backwall of a cavity. Gas enters the panels at the bottom and exits from the top. Each panel carries 637 liquid metal heat pipes which are mounted at right angle to the gas flow. The evaporators of the heat pipes protrude from the flux absorbing front surface of the panels, and the finned condensors traverse the gas stream.
The maximum heat load required of any heat pipe in the solar receiver is about 13 kW. This maximum heat load occurs at 750°C; at lower and higher temperatures the requirement is considerably less. Three liquid metal heat pipes which meet these requirements were successfully developed. They had a diameter of 60 mm (2. 375 inches), a length of 1100 mm (43 inches), and were fabricated from Inconel 601. The heat pipes were tested at power levels up to 16 kW and over the full temperature range.
Capital cost estimates were made for a 10 MW(e) pilot plant. The total projected costs, in mld-1978 dollars, range from $1,947 to $2,002 per electrical kilowatt. 01 the same basis, the cost of a water/steam solar plant is approximately 50% higher.
The objective of this project was the conceptual design of a Central Solar Receiver Gas Turbine Plant which utilizes a high temperature heat pipe receiver. Technical and economic feasibility of such a plant was to be determined and preliminary overall cost estimates obtained. The second
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objective was the development of the necessary heat pipe technology to meet the requirements of this receiver.A heat pipe receiver is ideally suited for heating gases to high temperatures. The heat pipes are essentially loss free "thermal diffusers" which accept a high solar flux and transform it to a lower flux which is compatible with heat transferred to gases. The high flux capability reduces receiver heating surface, thereby reducing receiver heat losses.
An open recuperative air cycle with a turbine inlet temperature of 816°c (1500°F) was chosen as the baseline design. This results in peak metal temperatures of about 87o0 c (1600°F). The receiver consists of nine modular panels which form the semicircular backwall of a cavity. Gas enters the panels at the bottom and exits from the top. Each panel carries 637 liquid metal heat pipes which are mounted at right angle to the gas flow. The evaporators of the heat pipes protrude from the flux absorbing front surface of the panels, and the finned condensors traverse the gas stream.
The maximum heat load required of any heat pipe in the solar receiver is about 13 kW. This maximum heat load occurs at 750°C; at lower and higher temperatures the requirement is considerably less. Three liquid metal heat pipes which meet these requirements were successfully developed. They had a diameter of 60 mm (2. 375 inches), a length of 1100 mm (43 inches), and were fabricated from Inconel 601. The heat pipes were tested at power levels up to 16 kW and over the full temperature range.
Capital cost estimates were made for a 10 MW(e) pilot plant. The total projected costs, in mld-1978 dollars, range from $1,947 to $2,002 per electrical kilowatt. 01 the same basis, the cost of a water/steam solar plant is approximately 50% higher.
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