This study aims to determine the performance of the air-water harvester machine on the freshwater mass, COP, and heat transfer rate with evaporator area variations. This research was carried out experimentally with the working fluid refrigerant R134a. The compressor used is a rotary type 0.5 PK compressor. This study varied the area of the evaporator, namely an area of 200820.27 mm2 (Case A), an area of 353414.85 mm2 (Case B) and an area of 503984.13 mm2 (Case C). The results showed that the highest water mass obtained was 0.446 kg for 7 hours produced using the smallest area variation or Case A. The highest total heat flow rate absorbed by the evaporator from air occured in the Case A too. Increasing the area of the evaporator does not guarenty to increase the freshwater production.

Keywords: Air-water harvester; frehwater production; COP; heat transfer rate.

[1]. Damanik YV. The effect of fan rotation speed on the performance of water distillation machines from air using the vapor compression cycle. Thesis, Sanata Dharma University, Yogyakarta, 2018.
[2]. Monica T. The effect of blowers and fans on the characteristics of air water harvesting machines. Thesis, Sanata Dharma University, Yogyakarta, 2018.
[3]. Faroni A. The effect of the pipe diameter of the condenser unit on the mass of water produced from the air-water harvester. University of Mataram, Mataram, Indonesia, 2022.
[4]. Gaol CL. Air water generation machine using 3/4 pk air conditioner components. Thesis, Sanata Dharma University, Yogyakarta, 2019.
[5]. Pangestu ADA. Performance of water harvester machine at various heat transfer areas of condenser unit. Thesis, University of Mataram, 2022.

The textile industry generates significant amounts of wastewater, often containing complex synthetic dyes that are harmful to aquatic ecosystems and human health. Conventional wastewater treatment methods are often inefficient for removing such dyes, necessitating the development of more effective solutions. This study investigates the application of nanotechnology for enhancing the decolorization of textile wastewater, focusing on the use of nanoparticles and nanomaterials as catalysts in the removal of textile dyes. A pilot-scale study was........

Keywords: Nanotechnology, Textile wastewater, Dye removal, Nanoparticles, Pilot study, Environmental remediation.

[1] Zhang, Y., & Liu, J. (2018). Toxicity and environmental impact of synthetic dyes in textile wastewater. Environmental Toxicology and Chemistry, 37(2), 352-359. https://doi.org/10.1002/etc.3989
[2] Bhuvaneshwari, T., & Ramasubramanian, V. (2019). Health risks associated with exposure to textile dye wastewater. International Journal of Environmental Science and Technology, 16(9), 5635-5645. https://doi.org/10.1007/s13762-019-02459-x
[3] Muthukumar, S., & Gopal, K. (2020). Treatment technologies for dye-containing textile effluents: Challenges and opportunities. Water Research, 169, 115202. https://doi.org/10.1016/j.watres.2019.115202
[4] Tripathi, S., & Kumar, S. (2021). Nanotechnology for wastewater treatment: A review of novel materials and technologies. Environmental Nanotechnology, Monitoring & Management, 16, 100491. https://doi.org/10.1016/j.enmm.2021.100491
[5] Mohamed, S. A., & Meena, P. (2020). Photocatalytic decolorization of textile dyes using TiO₂ and ZnO nanoparticles: A review. Journal of Hazardous Materials, 391, 122234. https://doi.org/10.1016/j.jhazmat.2020.122234

Encryption algorithms are functioning on different stages of the M-Commerce background. Using double encryption key, the present algorithm, and the system have achieved level of security. Encryption and decryption are performing simultaneously on M-Commerce background. The present study is focusing on prototyping existing encryption algorithms. There is an advance implementation of encryption algorithm using double encryption key. The study is suggesting the performance of algorithm and its achievement of level of security. Broadcasting and Its Receding Agent Based M-Commerce Model and Its transaction are the key area for the performance of the Encryption algorithms. The study is also introducing about architecture and process of The Broadcasting and Its Receiving Agents Based M-Commerce Model.

Keywords: M-Commerce, Encryption Algorithms.

[1] J.H.Trivedi, J.H.Darji, H.D.Patel, P.H.Trivedi, Designing and Prototyping Encryption Algorithms: Working as secure M-Commerce Transection of Broadcasting and Its receiving Agent Based M-Commerce Model, IOSRJEN e-ISSN:2250-3021, p-ISSN:2278-8719 Vol.3, Issue 8 (Auguest.2013),||V3||PP 25-33
[2] S Diego, T Joaquin, C Mildery, T Jesus, A new domain- based payment model for emerging mobile commerce scenarios, IEEE 2007.
[3] S Bhati, A Bhati, S Sharma, A new approach Towards encryption schemes: Byte-Rotation Encryption Algorithm, World Congress on engineering and computer science 2012 vol II, San Fransisco,USA.ISSN: 2078-0958.
[4] T Aphrodite, P Evaggelia, Business Models and Transactions in mobile electronic commerce: Requirements and Properties, Elsevier, Computer Networks 37(2001)
[5] C.J Date, A Kannan, Swamynathan, An Introduction to Database Systems, Eightth Edition, Chap.17 P.433.