SAIL BASED WIND ENERGY SYSTEM

Abstract

An invention is presented which greatly improves the potential for individual home wind energy conversion. The system utilizes conventional sail technology to greatly increase the wind energy capture at modest cost. The use of a large area collector for wind energy, such as a sail, allows the conversion of wind kinetic energy into pressure to be further converted into mechanical or electrical energy in a much smaller turbine than in the conventional wind mill configuration. This technology encourages the distributed generation of green and renewable wind energy, complementing solar generation and the grid tie box, toward making the residential home energy neutral.

Claims

1. Apparatus designed for mounting on the roof of a residential or commercial structure and employing a large area collector and small diameter, low noise turbine for catching wind over a large area, funneling it to the turbine and extracting the kinetic energy without the need for large area blades.

2. The apparatus of claim 1 in which the collector is a flexible membrane or cloth similar to a sail with sheets, poles and guys that allow adjustment of the collector with changing wind conditions to optimize the total wind energy collected and transformed into mechanical or electrical energy as well as to prevent damage to the collector in high wind conditions.

3. The apparatus of claim 1 in which the turbine is equipped with adjustable guide vanes to allow optimization of the turbine efficiency with wind speed.

4. The apparatus of claim 1 in which the collector also allows mounting solar cells on the surface for generating electrical energy from solar radiation while the collector is deployed.

5. The apparatus of claim 1 in which the turbine generator output is tied to a grid tie box to eliminate the need for local energy storage in times of low wind.

6. A smart system which can sense wind speed and direction and adjust the sheets, guys, poles and collector positioning to optimize the efficiency and magnitude of wind energy collection.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The advantages, nature and various additional features of the invention will appear more fully upon consideration of the illustrative embodiments now to be described in detail in connection with the accompanying drawings. In the drawings:

[0020] FIG. 1A shows the first preferred embodiment with a roof top sail arrangement that is deployable depending on wind and weather conditions. Shown in deployed position.

[0021] FIG. 1B shows the first preferred embodiment with a roof top sail arrangement shown in the furled position.

[0022] FIG. 2 is an exemplary sketch of the first preferred embodiment showing the retractable cloth roof top sail arrangement with side panel dampers for catching the wind.

[0023] FIG. 3 shows the wind turbine with turning vanes to optimize the performance of the turbine depending on wind speed.

[0024] FIG. 4 shows the second preferred embodiment with the solid structural wind catching roof and the adjustable wind capture dampers.

[0025] FIG. 5 is an exemplary sketch of the solid damper system for the second preferred embodiment.

[0026] It is to be understood that these drawings are for illustrating the concepts of the invention and are not to scale.

DETAILED DESCRIPTION

[0027] Referring now to FIG. 1A, in the first preferred embodiment a wind catching sail 1 is deployed over the entire or some portion of the structure roof 2. The deployment is done much as on a sailing vessel with sheets 3, guys 4 and winches along with poles/masts 5 to optimize the catching sail position for maximum wind collection, hold the sail in place and control the deployed area to limit the forces on the structure depending on wind velocity 6 similar to reefing on a sailboat. In this preferred embodiment the sail is envisioned to be deployed from the roof ridge 7 in two directions down the sides of the roof similar to roller furling gear on a jib sail. A small wind turbine 8 converts the kinetic energy in the wind catching sail to pressure and then to mechanical and electrical energy. The structure is provided with a damping system 9 that allows wind to enter the structure but prevents wind energy leaving. In one preferred embodiment, there are solar panels 10 mounted on the catching sail to make additional electricity from sunlight when the sail is deployed. In one preferred embodiment, the control of the sheets, guys and poles is accomplished with a smart electronic system that reads the wind direction and speed and automatically makes the necessary adjustments to the catching sail.

[0028] FIG. 1B shows the sail 1 furled in the roof top ridge 7 housing. FIG. 2A shows the deployable main sail being deployed with sail panels 11 covering the sides and front of the sail down to the roof. These panels are rigged with stiffeners 12 similar to sail battens to blow open, FIG. 2C when the wind is blowing toward the structure from any side, but closed, FIG. 2B to prevent the escape of the air on the opposite side. This causes the kinetic energy of the flowing air of the wind 6 to be converted to pressure according to Bernoulli's equation and this higher pressure air then drives a small roof top turbine 8. Structural integrity of the anchor points for the roof top sail may be supplemented with wire tie downs anchored to concrete footers at the corners and ridges of the house similar to stays on a sailboat.

[0029] Referring to FIG. 3, the vertical axis rooftop turbine 8 is designed to allow the ingress of air from any side. The turbine has several features that contribute to higher efficiency including a set of adjustable inlet vanes 13 that direct the air flow toward the turbine blades 14 for optimum angle 15 of attack and efficiency depending on the wind speed. The rotational velocity of the turbine blades may be controlled with the voltage on the generator unit to optimize the angular velocity for any wind speed so that the maximum energy may be extracted from the air mass flow.

[0030] FIG. 4 shows an alternative preferred embodiment with a solid second roof structure 16 architecturally integrated into the house. The solid structure has baffle panels 17 on three sides to allow the wind to enter the structure but not exit, as shown in FIG. 5. In one preferred embodiment the damper panels 18 are oriented vertically and have a lightly spring loaded axis of rotation 19. When the wind blows toward the structure from any direction, the dampers are blown open and allow the air to enter. At the opposite side, the dampers are pushed closed against the damper stop 20 blocking egress of the air from the structure and forcing all the air through the power generating turbine.

[0031] It is understood that the above-described embodiments are illustrative of only a few of the many possible specific embodiments, which can represent applications of the invention. Numerous and varied other arrangements can be made by those skilled in the art without departing from the spirit and scope of the invention.