{"title":"Paraffin as Phase Change Material","authors":"Amir Reza Vakhshouri","doi":"10.5772/intechopen.90487","DOIUrl":"https://doi.org/10.5772/intechopen.90487","url":null,"abstract":"Nowadays, numerous problems, including the environmental problem caused by fossil fuels, have led to greater attention to the optimal use of energy and the development of renewable energy. One of the most important parts of using energy efficiently is storing it. Among the many ways introduced for energy storage, thermal energy storage, including latent heat, is among the most interesting. This storage is done with materials called phase change materials (PCMs). These materials store the energy in the form of latent heat at constant temperature during the phase transition, discussed in this chapter, and release the same stored energy in the crystallization process. These materials are mainly classified into three catego-ries: organic, inorganic, and eutectics. Today, these materials are widely used with different properties in a variety of fields. Paraffin is one of the most important organic PCMs due to its numerous advantages that will be discussed in the following sections. From the methods of using paraffinic PCMs, two main methods, encapsulation and shape-stable PCMs, are discussed in detail. On the whole, this chapter of the book attempts to briefly discuss paraffins and their unique role in thermal energy storage systems as phase change materials.","PeriodicalId":244749,"journal":{"name":"Paraffin - an Overview","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129432335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenye Lin, Zhenjun Ma, H. Ren, Jingjing Liu, Kehua Li
{"title":"Solar Thermal Energy Storage Using Paraffins as Phase Change Materials for Air Conditioning in the Built Environment","authors":"Wenye Lin, Zhenjun Ma, H. Ren, Jingjing Liu, Kehua Li","doi":"10.5772/INTECHOPEN.86025","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.86025","url":null,"abstract":"Thermal energy storage (TES) using phase change materials (PCMs) has received increasing attention since the last decades, due to its great potential for energy savings and energy management in the building sector. As one of the main categories of organic PCMs, paraffins exhibit favourable phase change temperatures for solar thermal energy storage. Its application is therefore effective to overcome the intermittent problem of solar energy utilisation, thereby reducing the power consumption of heating, ventilation and air conditioning (HVAC) systems and domestic hot water (DHW) systems. This chapter reviews the development and performance evaluation of solar thermal energy storage using paraffin-based PCMs in the built environment. Two case studies of solar-assisted radiant heating and desiccant cooling systems with integrated paraffin-based PCM TES were also presented. The results showed that paraffin-based PCM TES systems can rationalise the utilisation of solar thermal energy for air conditioning while maintaining a comfortable indoor environment.","PeriodicalId":244749,"journal":{"name":"Paraffin - an Overview","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122824474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Nunes, Angela C. P. Duncke, M. Oliveira, Márcio Nele de Souza
{"title":"Wax Chemical and Morphological Investigation of Brazilian Crude Oils","authors":"E. Nunes, Angela C. P. Duncke, M. Oliveira, Márcio Nele de Souza","doi":"10.5772/INTECHOPEN.83736","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.83736","url":null,"abstract":"The waxes in petroleum can precipitate and form unwanted gels and deposition when exposed to low temperatures. The idea of this chapter is to approach methods of quantification and physicochemical and morphological characterization of waxes and how this information can help in understanding this deposition. Information such as the quantity of waxes and the chemical structures in the oil is fundamental to predict the possible deposition and its ability to aggregate with other crystals. For example, the knowledge about the wax morphology may contribute to explain the nucleation and growth of the deposits. The polarized light microscopy, the most common technique to visualize wax crystals, and the brightfield microscopy, the most simple technique, able to show crystal details that have not been seen on the polarized light, was used.","PeriodicalId":244749,"journal":{"name":"Paraffin - an Overview","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134068942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Managing Paraffin/Wax Deposition Challenges in Deepwater Hydrocarbon Production Systems","authors":"K. Shukla, Mayank Vishal Labh","doi":"10.5772/INTECHOPEN.83564","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.83564","url":null,"abstract":"The prevention of solids formation and their deposition are major challenges to design and operate any subsea hydrocarbon production systems. One of the most challenging issues is the management of paraffin/wax. As the water depth increases, at the low temperatures of subsea conditions, hydrocarbons may precipitate as wax, which can solidify and restrict the flow. During shutdown of a subsea production system wax gel may form and solidify when a crude oil cools below its pour point causing operational problems from downhole to the processing facilities. The pur-pose of this chapter is to address the paraffin/wax formation and deposition issues to properly design a subsea production system consisting of pipe-in-pipe flowline and flexible riser under deepwater environment. A field specific example is presented to manage the wax formation/deposition and prevent paraffin/wax deposition risks in an effective way during the normal and the shut-in operations of the subsea production system. This study illustrates that the subsea hardware, such as water stop and equipment valves, along with the flowline, riser and jumper should be sufficiently insulated in order to prevent any cold spots in the production system, and achieve sufficient cooldown time for the shut-in operations.","PeriodicalId":244749,"journal":{"name":"Paraffin - an Overview","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123597864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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