Comparing with the field system of natural circulation solar steam generation system [39], some parameters of the indoor experimental test rig, especially the diameter of receiver and heat load are different. In order to generalize the phenomena in both systems, the effective heat flux in receiver is chosen as the criterion measure. Thus the correlation between …
Highlights A single-phase natural circulation loop with a practical configuration is tested. A steady-state model generally applicable for natural circulation loop is proposed. The sub-models and correlations adopted in the model are experimentally verified. The model shows good predictability for the flow rate and temperature profile.
A steady-state model generally applicable for natural circulation loop is proposed. The sub-models and correlations adopted in the model are experimentally verified. The model shows good predictability for the flow rate and temperature profile. The findings for given facility are discussed based on an analysis of the model. Abstract
Once the primary fluid temperature reaches a targeted condition, the circulation pump is completely isolated by the control valves. The secondary loop is an open circuit for introducing the ambient water as a sink fluid into the SG. The flow rate of the secondary fluid is the crucial parameter for regulating the heat-removal rate in the SG.
The unexpected characteristics of the NC flow rate caused by the exceptional trend in SG heat-transfer were clearly demonstrated through sensitivity analysis for the NCL model. It is expected that the present NCL model can be utilized for obtaining a precise steady-state solution of the SPNC loop for any configurations and working conditions.
Before the SG model is employed, the temperature profile inside the SG is approximated to be linear. The results clearly indicate that practical considerations improve the predictability of the NC flow rate, making the predicted value closer to the measured value.
The NC flow rates predicted using the proposed NCL model for 29 steady-state conditions were within 5% error compared with the measurements for all cases. Additionally, the predictions of the temperature profile along the primary loop closely matched the measurements for all working conditions.
Comparing with the field system of natural circulation solar steam generation system [39], some parameters of the indoor experimental test rig, especially the diameter of receiver and heat load are different. In order to generalize the phenomena in both systems, the effective heat flux in receiver is chosen as the criterion measure. Thus the correlation between …
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Get Priceovercome before the wide acceptance of natural circulation as the normal mode of coolant circulation in nuclear power reactors are briefly described. Classification of NCSs and the terminologies commonly encountered in natural circulation systems are also briefly explained. 1. INTRODUCTION In general, a heat source, a heat sink and the pipes connecting them form …
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Get PriceIn this work, the effects of heat load on thermal performance of the PTC-based natural circulation solar steam generator were investigated experimentally based on the indoor experimental test rig constructing by a two-phase thermosyphon. The results illustrated that …
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Get PriceFlow boiling heat transfer of water in a thermosyphon loop based natural circulation solar steam generation system with a horizontally-arranged receiver towards parabolic trough collector (PTC) applications was studied experimentally. The diameter ratio (Rd) of the receiver was varied over a range from 1.0 to 2.0 to explore its effect on flow boiling heat …
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Get PriceDOI: 10.1016/J.IJHEATMASSTRANSFER.2015.09.075 Corpus ID: 98760024; Effect of receiver diameter ratio on thermal performance of natural circulation steam generation system as applied to parabolic trough collector using water as working fluid
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Get PriceUnexpected characteristics of the natural circulation (NC) flow rate are observed for two test groups under high-temperature conditions. An NC loop (NCL) model for a steady …
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Get Pricenatural circulation loop (NCL). Such density gradient-based flow systems are more reliable than forced systems as the fluid circulation mechanism is power-free. In particular, single-phase NCL (SPNCL) systems have extensive applications in industries such as solar thermal systems, nuclear reactors, electronics, transformers, etc. due to their ...
Get PriceIn this work, the effects of heat load on thermal performance of the PTC-based natural circulation solar steam generator were investigated experimentally based on the indoor experimental test rig constructing by a two-phase thermosyphon. The results illustrated that flow pattern in the receiver of thermosyphon was transferred from ...
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Get Pricenatural circulation loop (NCL). Such density gradient-based flow systems are more reliable than forced systems as the fluid circulation mechanism is power-free. In particular, single-phase …
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Get PriceUnexpected characteristics of the natural circulation (NC) flow rate are observed for two test groups under high-temperature conditions. An NC loop (NCL) model for a steady-state solution that reflects both heat-loss and heat-sink effects is developed by employing the lumped-component method and the moving-boundary algorithm.
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