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Baomin Dai

Bio: Baomin Dai is an academic researcher from Tianjin University of Commerce. The author has contributed to research in topics: Heat pump & Coefficient of performance. The author has an hindex of 16, co-authored 45 publications receiving 765 citations. Previous affiliations of Baomin Dai include Tianjin University & University of Tokyo.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this paper, an environmental and economical assessment model is developed, in order to evaluate the performances of transcritical CO2 heat pump system with dedicated mechanical subcooling (CO2 HPDMS).

105 citations

Journal ArticleDOI
01 Jan 2014-Energy
TL;DR: In this paper, the authors studied zeotropic mixtures of carbon dioxide blends with 7 low GWP working fluids for use in a TRC (transcritical Rankine cycle) for low-grade heat conversion.

104 citations

Journal ArticleDOI
Baomin Dai1, Chaobin Dang2, Minxia Li1, Hua Tian1, Yitai Ma1 
TL;DR: In this article, the effects that the discharge pressure, component ratio, hot-water outlet temperature and chilled water inlet temperature have on the coefficient of performance (COP) of a heat pump water heater are analyzed when the pinch point of the heat exchange is considered.
Abstract: Blends of CO2 with ten low-global warming potential (GWP) working fluids are evaluated for use in a heat pump water heater. The effects that the discharge pressure, component ratio, hot-water outlet temperature and chilled water inlet temperature have on the coefficient of performance (COP) of heat pump are analyzed when the pinch point of the heat exchange is considered. It is found that temperature glide of zeotropic mixture has a good thermal match with the temperature change of water as two pinch points appear in the gas cooler/condenser or evaporator. The good thermal match in the heat exchangers promotes the system COP. Addition of low-GWP working fluids to pure CO2 can reduce the high-side pressure. The results show that CO2/R41 and CO2/R32 are suitable candidates for heat pump water heaters because of their high COP and low high-side pressure in comparison with those of a pure CO2 cycle.

82 citations

Journal ArticleDOI
TL;DR: Using air source heat pump system for residential heating is a practical way to replace coal-fired boiler in China to alleviate the haze problem, and CO2 is a promising candidate to replace hydroch...

78 citations

Journal ArticleDOI
TL;DR: In this paper, a transcritical CO 2 heat pump (HP) system for residential space heating integrated with direct dedicated mechanical subcooling (DMS) is proposed, and mathematical models are developed to study the...

75 citations


Cited by
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01 Jan 2016
TL;DR: The fundamentals of engineering thermodynamics is universally compatible with any devices to read and is available in the book collection an online access to it is set as public so you can download it instantly.
Abstract: Thank you for downloading fundamentals of engineering thermodynamics. Maybe you have knowledge that, people have look numerous times for their favorite books like this fundamentals of engineering thermodynamics, but end up in malicious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they juggled with some harmful bugs inside their computer. fundamentals of engineering thermodynamics is available in our book collection an online access to it is set as public so you can download it instantly. Our book servers hosts in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the fundamentals of engineering thermodynamics is universally compatible with any devices to read.

330 citations

Journal ArticleDOI
TL;DR: In this paper, a review of phase change materials used to optimize building envelope and equipment is provided, and the existing gaps in the research works on energy performance improvement with phase change material are identified, and recommendations offered as authors' viewpoints in 5 aspects.

275 citations

09 Jul 2018
TL;DR: A review of the state of the art and the current research activities of high temperature heat pumps with heat sink temperatures in the range of 90 to 160°C can be found in this paper.
Abstract: Abstract This study reviews the current state of the art and the current research activities of high temperature heat pumps (HTHPs) with heat sink temperatures in the range of 90 to 160 °C. The focus is on the analysis of the heat pump cycles and the suitable refrigerants. More than 20 HTHPs from 13 manufacturers have been identified on the market that are able to provide heat sink temperatures of at least 90 °C. Large application potentials have been recognized particularly in the food, paper, metal and chemical industries. The heating capacities range from about 20 kW to 20 MW. Most cycles are single-stage and differ primarily in the refrigerant (e.g. R245fa, R717, R744, R134a or R1234ze(E)) and compressor type used. The COPs range from 2.4 to 5.8 at a temperature lift of 95 to 40 K. Several research projects push the limits of the achievable COPs and heat sink temperatures to higher levels. COPs of about 5.7 to 6.5 (at 30 K lift) and 2.2 and 2.8 (70 K) are achieved at a sink temperature of 120 °C. The refrigerants investigated are mainly R1336mzz(Z), R718, R245fa, R1234ze(Z), R600, and R601. R1336mzz(Z) enables to achieve exceptionally high heat sink temperatures of up to 160 °C.

246 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive and systematic review around an entire frosting-defrosting cycle might provide an overview of the analytical tools for scholars, researchers, product developers, and policy makers, and shed new light on the designing and performance optimization of ASHP units.

222 citations

Journal ArticleDOI
TL;DR: In this article, a review of the supercritical CO2 Rankine cycle and its various working fluids, heat sources, heat sinks and analysis approaches, and performance analyses and optimization of various supercritical CRS cycle configurations along with comparison with other working fluids are discussed.
Abstract: Due to personal and environmental safeties along with various advantages, CO2 became a potential choice as working fluid for both heat engine and heat pump cycles. Because of better temperature glide matching between heat source and working fluid during heat addition leading to no pinch limitation, CO2 has been proposed recently as working fluid for supercritical Rankine cycle with low grade heat sources. Supercritical Rankine cycle and its various working fluids, heat sources, heat sinks and analysis approaches, and performance analyses and optimization of various supercritical CO2 Rankine cycle configurations along with comparison with other working fluids, prototype development, component design and challenges are well-grouped and discussed. Supercritical CO2 Rankine cycle is superior to both steam and organic Rankine cycles, whereas yields mix results compared to other fluids in supercritical Rankine cycle with system compactness and environmental benefit as unique advantages. Future research pathways regarding to system components, experimentation, operating parameter optimizations, control strategies, etc. are discussed as well. Although, there is no supercritical CO2 Rankine cycle in operation up to now, it is becoming a future pathway due to its promising research outcomes and this review will be useful for further progress.

190 citations