The Indian Space Research Organization has gotten patents for its LCHGs. LCHGs are Liquid Cooling and Heating Garment that are utilized to give agreeable temperature to the space explorers in space. The article of clothing shields the space explorers from hot and cold situations. It evacuates the perspiration of the space travelers. They additionally help shield the space explorers from humidity or moisture and extraordinary temperature conditions that may exist in the workplace. It is utilized in the Indian army and putting out fires applications. The patent of clothing got by the ISRO has an external layer that is made of polymeric texture net. The internal layer comprises a polymeric texture tricot that interacts with the wearer. The external and internal layers are isolated by tubes designed to circle heat move through delta and outlet valves. ISRO checked the speed and air temperature. The coolant stream pace of 100 ml/minute was gotten. Additionally, the adequacy of the LCHG framework was demonstrated with a coolant stream pace of 50-1000 ml for each moment. ISRO has started the Human Space Flight Program, Gaganyaan, to take people to space by 2022. Under the program, three space explorers are to circle the earth at an elevation of 400 kilometers for 7 days.
Significance of Liquid Cooling and Heating Garment
This invention identifies with the current innovation identifies with a fluid cooling and warming article of clothing made of biocompatible textures and parts to give agreeable internal heat level and evacuation of sweat. Favorably, the piece of clothing has prevalent warmth move effectiveness and can be advantageously utilized for keeping up the internal heat level of the wearer at levels reasonable for the physiological exhibition required. These articles of clothing discover use in human space flight and furthermore for earthbound activities, for example, putting out fires, working in steel plants, and so forth.
Selection criteria of material for Liquid Cooling and Heating Garment
- For inner layer the ISRO used Wicking layer, sweat absorption, flexibility, high permeability and biocompatibility, light weight, low grams per square meter (GSM), low Total Mass Loss (TML), low Collected Volatile Condensable Materials (CVCM) with antibacterial coating.
- For middle layer where tubes are present Coolant tubes-Flexibility and low hardness, high thermal conductivity, low density, plasticizer free and biocompatibility, low GSM, low TML, CVCM with antibacterial coating.
- And for outer layer Ventilation Layer-flexibility, support for tubes and openings for ventilation, low GSM, low TML, CVCM and biocompatible
Objection on Liquid Cooling and Heating Garment
The Indian intellectual property office send FER to the ISRO on 23 January 2019 where the objection was on inventive steps, abstract, claims, drawing formats and signature on document. After six months on date 23 July 2019 the ISRO had submitted the reply for FER in which ISRO clarified the entire question that asked in FER and send it for approval with copy of drawings, abstract, claims and signature on documents and forms. After that Indian intellectual property office sends a hearing notice letter in which patent office mentioned all the prior art that nearly matched with ISRO’s invention Liquid Cooling and Heating Garment on date 18 june2020 ISRO had submitted all the documents in hearing that may separate the ISRO’S invention from other prior art and on 19june2020 ISRO got the patent on Liquid Cooling and Heating Garment.
Perspective of Designer and Inverters of Liquid Cooling and Heating Garment
The patent is substantial for the 20 years from the date of utilization, that is, February 8, 2016, and was conceded on June 19. While ISRO is the patent proprietor for the this invention, The designers and inventers are Srirangam Siripothu, Reshmi Balachandran, Saraswathi Kesava Pillai Manu, and Gurumurthy Chandrasekaran. As indicated by the patent papers documented by ISRO, the article of clothing made of biocompatible textures and parts to give agreeable internal heat level and evacuation of sweat. These articles of clothing discover use in kept an eye on space flights and furthermore for earth-bound activities, for example, fire fighting, working in enterprises and so forth, the Indian space organization said in its filings. The tight, single-piece article of clothing covering the body, middle and appendages from neck to toe weighs between 1,000 to 3,000 g and has front-section zipper to be worn inside over which the flight or the space suit is to be worn. As indicated by ISRO, the article of clothing has unrivalled warmth move productivity and can be advantageously utilized for keeping up the internal heat level of the wearer at levels appropriate for the physiological presentation required. The LCHG controls the internal heat level of the wearer including external polymeric texture tricot and inward polymeric texture net in contact with the wearer’s skin. The external and inward layer of the article of clothing is isolated by a majority of cylinders designed to course a warmth move liquid. The cylinder is organized so that it covers the whole body with no covers and expel greatest warmth from the wearer. The Indian space office is dealing with a yearning Rs 10,000-crore venture ‘Gaganyaan’ to send three flying corps pilots into space for seven days. Four Indian Air Force pilots are experiencing space explorer preparing in Russia. Out of these, three will go into space at a stature of around 400 km. (IANS).
Parameters for Liquid Cooling and Heating Garment taken by ISRO
| S.No. | Parameter | Desirable |
| 1. | Total tube length | 60-90 m |
| 2. | Tube size | ID = 2-5 mm OD = 4-7 mm |
| 3. | Distance between two parallel tubes | 1.5-3 cm |
| 4. | Number of critical bends (2-4 em curvature) | 30 (max.) |
| 5. | Heat transfer f1uid f1ow (water) rate | 50 -1000 ml/min |
| 6. | Pressure drop | 0.1-1.0 bar |
| 7. | Coolant inlet, outlet temperatures | 10-15 °C, 25-30 °C |
| 8. | LCHG total weight | I000-3000 g |
Method of Liquid Cooling and Heating Garment
The liquid cooling and heating garment for controlling internal heat level of the wearer containing an external layer framing the external surface of the piece of clothing made of polymeric texture net after that an inward layer of polymeric texture tricot in contact with the skin of the wearer wherein the external and inward layers of the piece of clothing are isolated there between by a majority of cylinders arranged to course a warmth move liquid across wanted territories of the body of the wearer through in any event one bay and at any rate one outlet operable associated with a reasonable valve intends to specifically control the gracefully of the warmth move liquid to and from the warmth move supply.
Conclusion
The liquid cooling and heating garment is a defensive article of clothing for human space flight. It is a tight long piece of clothing that covers the wearer’s middle just as appendages, from neck to toe. ISRO’s fluid cooling and warming article of clothing is intended to the ragged as a one-piece lightweight solace internal wear. The uncommon thing about this one of a kind piece of clothing is that it very well may be worn for quite a while with no effect on the wearer’s skin, for example, tingling or bothering or disease. The patent has granted on this invention after 4 years to the ISRO on june 2020. The ISRO make us proud as Indian again with this invention.
