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Preface With the social and economic developments, heat pump becomes more and more important in various energy conversion fields due to its high energy efficiency. However, its working fluids face serious challenges due to global warming and ozone layer depletion since the end of twentieth century. Carbon dioxide (CO2) is a natural fluid and can provide an excellent energy and environment solutions to replace freon substances, such as chlorofluorocar- bons (CFCs) and hydrochlorofluorocarbons (HCFCs). Furthermore, for the past decade, researchers have studied and obtained more and more knowledge about supercritical fluid flow dynamic and heat transfer and also phase change flow and heat transfer. Thus, trans- critical thermodynamic cycles using carbon dioxide as working fluid are gaining more and more attention. Transcritical CO2 heat pump cycles own many unique advantages, such as a higher COP performance and higher temperature for thermal energy provided, etc. These natural advantages of the transcritical CO2 cycle clearly extend their applications to wider fields and provide better energy and environment solutions to our society. This book does not aim to provide every aspect of transcritical CO2 heat pump. But all the key points related to the transcritical CO2 heat pump cycles and systems are included. Both fundamental knowledge and application are considered and discussed in the main text to help the reader to better understand the transcritical CO2 heat pump cycles and systems. The fundamental aspects mainly include flow dynamic and heat transfer of supercritical CO2, evaporative flow and heat transfer of CO2 liquid-gas fluid, theoretical analysis of tran- scritical CO2 compression and expansion processes, and subcooling methods. The book also provides several important applications of the transcritical CO2 heat pump cycles, such as CO2 heat pump water heater and CO2 space heating. The book is expected to be helpful for researchers, postgraduates, engineers and also policy makers, etc. We thank the many helpers, including the following, for their collecting of documents, reviewing of many publications and checking of texts: Dr. Qiuyun Zheng, Mr. Guanbang Wang, Mr. Zhaorui Peng, Ms. Yisai Gao, Mr. Xuegang Lu, Mr. Junmin Yin, Mr. Bing Fang, Mr. Yudong Zhu. Others who have mainly contributed to some chapters are listed separately. We greatly appreciate these contributions. We also recognize the effort of Mr. Xingyu Shang for the text editing. In addition, the support of the National Key Research xiiiPDF Image | What is a heat pump
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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