US 11,692,740 B2Granted

Double point-focusing solar energy collection apparatus

AssigneeChangzhou University

InventorsCheng Wang, Ye Zhu

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Abstract

A double point focusing solar energy collection apparatus of the present invention includes a heat collector, a secondary concentrator, and a bracket. The heat collector includes a primary concentrator and a heat collection tube, in which the primary concentrator has a focus point. The secondary concentrator has a focus point. The bracket supports the primary concentrator, the heat collection tube, and the secondary concentrator. The heat collection tube is located between the primary concentrator and the secondary concentrator and located on the focus points of the secondary concentrator and the primary concentrator. By adding the secondary concentrator, which is a rotating paraboloid reflector or circular Fresnel reflector, it can achieve low light loss and high heat collection efficiency, and erosion of the heat collection tube by sand, rain, and snow can be effectively prevented, thereby extending the lifetime of the heat collection tube effectively.

Claims12

Dependent claims

A double point focusing solar energy collection apparatus, comprising:

a heat collector comprising a primary concentrator and a heat collection tube, wherein the primary concentrator has a focus point;
a secondary concentrator having a focus point;
wherein a first opening of the primary concentrator is larger than a second opening of the secondary concentrator, and a first focal length of the primary concentrator is larger than a second focal length of the secondary concentrator, wherein a first ratio of the first opening to the first focal length is equal to a second ratio of the second opening to the second focal length;
and
a bracket supporting the primary concentrator, the heat collection tube, and the secondary concentrator, wherein the heat collection tube is located between the primary concentrator and the secondary concentrator and is located on focus points of the secondary concentrator and the primary concentrator, wherein the primary concentrator is a circular Fresnel reflector, and the secondary concentrator is a circular Fresnel reflector.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/614,375Filed 18 May 2018
Priority: CN 201710351785.018 May 2017
Published: US 2020/0158378 A121 May 2020
Granted: 4 Jul 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F24S 23/70
Arrangements for concentrating solar-rays for solar heat collectors: with reflectors
F24S 23/71
With reflectors: with parabolic reflective surfaces
F24S 10/40
Solar heat collectors using working fluids: in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
F24S 10/70
Solar heat collectors using working fluids: the working fluids being conveyed through tubular absorbing conduits