FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
And
THE PATENTS RULES 2003
COMPLETE SPECIFICATION (See Section 10; Rule 13)
EVACUATED SOLAR TUBE EMBEDDED WITH PIERCED TWISTED
TAPE SYSTEM FOR HEATING AIR

Title of the invention
Evacuated Solar Tube embedded with Pierced Twisted Tape system for Heating Air
Field of the invention
The present invention relates to the field of evacuated tube solar air heater and particularly relates to the heating up the air with the evacuated tube solar air heater with pierced twisted tape.
Prior art for the invention
1. The patent document with application number "CN210399118" Titled "Novel warm air heating system combined with solar energy" describes "The utility model relates to a novel warm air heating system combined with solar energy. The system is characterized in that circulating water preheated by a solar thermal collector (1) enters an auxiliary heater (2) to be reheated, then is conveyed into a heat exchanger (4) by a water pump (3) to be subjected to heat exchange and finally returns to the solar thermal collector to complete circulation. Air blown out of the draught fan (5) exchanges heat with the heat exchanger (4) and then enters an air duct below a floor, part of heat of hot air is transferred into the structural layer (7) and the phase-change heat storage material (8) through the heat conducting piece (6) in the flowing process of the air duct, and the other part of heat is directly brought into a room through the ground air outlet (9) by means of air. Warm air and ground heat storage technologies are combined, rapid preheating of a room is achieved, a large amount of energy is stored, and therefore the purpose of more efficiently utilizing solar energy is achieved."
2. The patent document with application number "CN109987662" titled "Solar energy and LNG coupled humidification-dehumidification seawater desalination process" describes "The invention relates to a solar energy and LNG coupled humidification-dehumidification seawater desalination process. Solar distillation is combined with humidification-dehumidification seawater desalination; with solar energy as a heat source for high temperature heating and LNG as a condensing low temperature heat source, condensation dehumidification of hot-wet air and water vapor is accelerated, and meanwhile, hot air heated by a solar thermal collector is fed into a solar evaporating apparatus to accelerate

convective heat transfer and mass transfer; the seawater evaporation temperature is reduced in negative pressure environment; and therefore, the problem of low water yielding rate and efficiency of seawater desalination by the conventional solar distillation method is solved. The primary concentrated seawater from a solar distillation apparatus is taken as feed seawater for a dehumidification apparatus and no apparatus for heating seawater is omitted, so that the problems of corrosion and scaling caused by heating of seawater during seawater desalination by the conventional humidification-dehumidification method are avoided. The invention also relates to the use of a natural gas burner to heat fresh seawater so as to solve the problem of shortage of solar energy in severe weather, with the waste heat of the exhaust gas of the burner being utilized by means of a heat exchange apparatus instead of using a solar air collector."
wherein the present invention focuses an evacuated solar tube embedded with pierced twisted tape system for heating air.
Objects of the invention
The primary object of the present invention is anevacuated solar tube embedded with pierced twisted tape system for heating air with small technique. Another object of the present invention is the simple and cheaper technique to achieve the hot air without complex sophisticated system. Yet another object of the present invention is that the absorber material plays pivotal role in conversion of cold air into hot air in the specific time.
Summary of the invention
In this innovation, an evacuated tube solar collector with inserted baffles and pierced twisted tape is developed using one ended all glass tubes. This system consists of a header, evacuated tubes with inserted baffles and pierced twisted tapes. The header consists two separate passages for flowing of the working fluid. An aluminum baffle of 1750 mm length is inserted for separating air flow path as upper and lower air channels inside of the evacuated tube. The evacuated tubes are connected to the header section such that the lower channel of the tube is connected with bottom half of the header and the upper channel of the tube is connected with top half of the header. The pierced twisted tape is fitted with top side of the baffle plate. The pierced twisted tape is provided for inside evacuated tube is created

turbulence, which enhances the convective heat transfer from the absorber tube surface. This system can be used to generate hot air at desired temperature by optimizing the flow rate and the twisted ratio.
Brief description of diagram
Figure 1 is the schematic representation of Evacuated Solar Tube embedded with Pierced Twisted Tape system for Heating Air

Detailed description
The following specification particularly describes the invention and the manner in which it is to be performed.
At present scenario nearly 91% of industrial energy needs are satisfied by the fossil fuel and its consumption rate has been increasing exponentially in recent years. Due to the crises of fossil fuel and its environmental impact alert theresearch communityto find a novel methodfor extracting the energy from various resources and to fulfil the industrial requirements. The industries also want to shift from the traditional system to produce the energy at cost effective manner and to enhance their market share. These needs improve the importance of renewable energy technologies in industries. The international solar energy society reported that solar energy conversion technologies has been economically feasible, technically reliable and able to satisfy the 59% world energy requirement in the year of 2050.The energy produced by the sun is about 3.8x10 kW. Among this energy only 60 percent reaches the ground and which can be a potential source of producing the power approximately 3000 GW. Even though it is abundantly available, it is clean and free, and doesn't influenced by geo political effects.The energy received from the sun has been converted in to useful form of energy and to meet the process heating requirements with the help of solar thermal collectors.Solar thermal collectors receive the energy form the sun in the form of solar radiation. The continuously immersed solar radiation on the absorber surface increases its thermal energy then it is transferred to the working fluid. Based upon the design of the absorber surface it is classified in to concentrating and non-concentrating collectors. The concentrating collectors are applicable for medium and high temperature industrial applications as it processes temperature ranges from 150 -400°C. The flat plate solar collectors are suitable for low temperature applications (<100°C) and for this operating conditions it can be replaced by evacuated tube solar air heaters for improving its operating performance.An evacuated-tube collector is made up of pair of modular tubes, where heat leakages to the ambient are minimized by the provision of the vacuum encapsulation around the tubes. Nowadays, evacuated tube collectors made up of better optical performance with absorptivity and emissivity of 95% and 5% respectively.Most of the industries utilizes the evacuated tube solar collector for heating the working fluids like

water, oil and ethylene glycol.Only in very few applications the system used for produced the hot air but still the outlet temperature is ranges from 50-80 °C. This happens due to the fact that poor thermo physical properties of air and lower convective heat transfer coefficient between the air and absorber surface.Various heat transfer augmentation techniques are experimented for improving the convective heat transfer coefficient that occurs inside the evacuated tube collector. Probably creating of turbulence inside the evacuated tube by using the pierced twisted tape is a one of the very effective heat collection technique from the absorbersurface.
This procedure is advised in double pipe heat exchangers, where it is placed inside the inner tube for improving the effectiveness and thermo-hydraulic performance of the heat exchanger. The twisted tape eliminates the formulations of laminar sublayer in turbulent flow region and enhances the heat transfer. In very few investigations it is reported that twisted tapes are used as a turbulator as well as artificial roughness ribs for enhancing the performance flat plate solar collectors.With respect to evacuated tube collectors, there is no attempt was made by the researchers to integrate this technique for enhancing the heat transfer rate. In this proposed innovation the pierced twisted tape is to be embedded with evacuated tube collectors for attainingdesired thermal performance by improving the convective heat transfer.The evacuated tube-based air heating system made up ofa header assembly, evacuated tube collectors with baffle plate and pierced twisted tape, blower and supporting structures. Standard evacuated tubes having diameters of 58 mm and 47 mm at outside and inside of the tubes respectively. The length of the tube is 1800 mm. All the evacuated tubes contain double concentric glass tubes made up of borosilicate glass material and there is a perfect vacuum environment (<10-2 Pa) that exists between the outer and inner glass tubes. The radiations passed through the transparent outer tube are absorbed by the inner tube, which acts as absorber surface. The evacuated tubes are connected to the header section such that the lower portion of the tube is connected with the bottom half of the header and the upper half of the tube is connected with the top half of the header. Each of the tubes is inserted with baffle plate and pierced twisted tape. The pierced twisted tape only placed above the baffle plate and creates the turbulence in the upper path.Thepitch and the twist ratio of the pierced twisted tape can be varied to achieve the desired temperature rise andwith minimum consumption of the pump work. Decrease in twist ratio and pitch ratio will lead to lower the pressure drop. Therefore, it is to be

adjusted based on the requirements. The hole arrangement can be made of different profiles. The holes sizes also to be adjusted for effective flow separation and re attachment and enriching the boundary layer phenomena.
The embodiment works in the way like, the cold air is drawn into an inlet (1} to the lower portions of a glass tube (2) via the bottom half of the header. Further, the air is directed to the upper portions within the tube and subsequently, the air absorbs heat energy from an absorber surface (3). A baffle plate (4) is placed in middle of the glass tube (2), which segregates the into upper and lower half. The air passing through the lower half of the tube and becomes hot further a pierced twisted tape (5) is placed which optimized for achieving desired temperature and then pass out through an outlet (6)which is hot air. The process of air flow is achieved with the help of a suction blower (7).

Claims
1. We claim,
Anevacuated solar tube embedded with twisted tape system for heating air, comprises
of:
An inlet (1);
A glass tube (2);
An absorber surface (3);
A baffle plate (4);
A pierced twisted tape (5);
Anoutlet(6); and
A suction blower (7),
wherein, the cold air from atmosphere is entries through the inlet (1) in lower portion of
the glass tube (2), which is being absorbed by the absorber surface (3),
wherein, the glass tube (2) is segregated into two with the aid of the baffle plate (4),
which has the pierced twisted tape (5), occupies the upper portion by pass through which
it comes out as hot air by the way of the outlet (6), the air flow inside the glass tube (2) is
achieved by the suction blower (7).
2. The evacuated solar tube embedded with pierced twisted tape system for heating air, as claimed in claim 1, wherein, the simple and cheaper technique to achieve the hot air without complex sophisticated system.
3. The evacuated solar tube embedded with pierced twisted tape system for heating air, as claimed in claim 1, wherein,the absorber material plays pivotal role in conversion of cold air into hot air in the specific time.