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学者姓名：马国远
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Abstract ：
Since the launch of China's "coal to electricity" project, many new room radiator heating devices have been developed in China, such as split air conditioning and water-loop heat pump systems. In order to avoid the sense of blowing brought by split air conditioners and overcome the problem of low energy efficiency of water-loop heat pump system, relevant researchers proposed the natural convection heat exchange system. Although natural convection system solves the above problems, it is still facing the problem of low heat exchange efficiency, complexity of the system structure and other problems. In order to solve the above problems, a heat pump system with wire-and-tube heat exchange terminal based on natural convection heat transfer is proposed and a set of prototype is developed. The system performance, indoor air temperature distribution and system start-up characteristics under different working conditions were tested in the psychrometric room. The results show that the heat pump system can achieve a heating COP (coefficient of performance) of 3.55 when the outdoor temperature is -5 C-degrees and the indoor temperature is 20(degrees)C and a cooling COP of 2.83 when the outdoor temperature is 40(degrees)C and the indoor temperature is 27(degrees)C. The indoor temperature is uniformly distributed, and the human body has better sense of thermal comfort. These works provide a new choice for the heating and cooling of residential buildings.
Keyword ：
Wire-and-tube Wire-and-tube Heat pump Heat pump Thermal performance Thermal performance Natural convection Natural convection
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| GB/T 7714 | Gong, Yuexuan , Ma, Guoyuan , Xu, Shuxue et al. Experimental study on heat pump system with wire-and-tube heat exchange terminal [J]. | THERMAL SCIENCE AND ENGINEERING PROGRESS , 2024 , 54 . |
| MLA | Gong, Yuexuan et al. "Experimental study on heat pump system with wire-and-tube heat exchange terminal" . | THERMAL SCIENCE AND ENGINEERING PROGRESS 54 (2024) . |
| APA | Gong, Yuexuan , Ma, Guoyuan , Xu, Shuxue , Wang, Lei . Experimental study on heat pump system with wire-and-tube heat exchange terminal . | THERMAL SCIENCE AND ENGINEERING PROGRESS , 2024 , 54 . |
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Abstract ：
This paper presents a new design method for turboexpander-compressors used in air refrigeration. As a key component of the reverse Brayton cycle, the efficiency of the turboexpander-compressor significantly has an impact on the overall cycle performance. The expander section is optimized for multi-objective efficiency at different flow rates using the Imperialist Competitive Algorithm to achieve high performance across all operating conditions. Regarding achieving high utilization efficiency for output power from efficient expanders, the compressor section adopts combined methods involving the jet-wake model and parameter equations. The proposed design is validated through public models, computational fluid dynamics simulations and experiments. Simulations and analysis are conducted on test cases representing comprehensive operational scenarios for both the compressor and the expander, confirming that conclusions drawn based on this method align well with underlying theoretical principles. At the design mass flow, the expander efficiency is 89%, and the compressor utilizes the output power of the expander with an efficiency of 90%. Near the design flow, the expander efficiency is more than 85%, and the compressor utilizes the output power of the expander with an efficiency exceeding 80%. This paper presents a method for turboexpander-compressors applicable to air refrigeration cycles, which achieves a reduction in design costs and an improvement in efficiency under varying loads.
Keyword ：
Multi -objective optimization Multi -objective optimization Turboexpander-compressor Turboexpander-compressor reverse Brayton cycle reverse Brayton cycle
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| GB/T 7714 | Tian, Yu , Ma, Guoyuan , Wang, Lei et al. A design method of turboexpander-compressors based on multi-objective optimization applied to reverse brayton cycle [J]. | APPLIED THERMAL ENGINEERING , 2024 , 254 . |
| MLA | Tian, Yu et al. "A design method of turboexpander-compressors based on multi-objective optimization applied to reverse brayton cycle" . | APPLIED THERMAL ENGINEERING 254 (2024) . |
| APA | Tian, Yu , Ma, Guoyuan , Wang, Lei , Rong, Weilai , Wu, Junfeng . A design method of turboexpander-compressors based on multi-objective optimization applied to reverse brayton cycle . | APPLIED THERMAL ENGINEERING , 2024 , 254 . |
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Abstract ：
本实用新型公开了热泵型换气热回收与空气处理集成系统，包括热泵系统a、热泵系统b、换气热回收设备，以及相互隔离的排风道和新风道，换气热回收设备置于相互隔离排风道和新风道之中，在热回收设备下游的排风道中依次布置有热泵系统a排风换热器和热泵系统b排风换热器，在其下游的新风道中依次布置有第一新风换热器和新风换热器，热泵系统b室内换热器和室外换热器分别置于室内侧和室外侧，相互独立的热泵系统a和b的密闭回路均按次序相互复合在一起；通过不同设备或/和阀门的通/断组合，可转换出多种工作模式。
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| GB/T 7714 | 马国远 , 李想 , 许树学 et al. 热泵型换气热回收与空气处理集成系统 : CN202320891534.2[P]. | 2023-04-20 . |
| MLA | 马国远 et al. "热泵型换气热回收与空气处理集成系统" : CN202320891534.2. | 2023-04-20 . |
| APA | 马国远 , 李想 , 许树学 , 李富平 . 热泵型换气热回收与空气处理集成系统 : CN202320891534.2. | 2023-04-20 . |
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Abstract ：
In order to improve the cooling and dehumidification performance of household air conditioners, a new air conditioning system with double evaporation temperature is proposed. The simulation model of the new system is established, the variation of system performance with compressor high/low pressure cylinder volume ratio, inlet air temperature, relative humidity, air speed, etc. are simulated and experimentally studied. The research results show that when the volume ratio of high and low pressure cylinders of compressor is 0.5 similar to 1.2 and air speed 2.2 m/s, cooling COP of double evaporation temperature air conditioning system could obtain the maximum value. Compared with single evaporation temperature system, cooling COP of double evaporation temperature system can be increased 3%similar to 4.2%; the dehumidification capacity is 0.06 similar to 0.61 kg/h, about 1.69% similar to 5.83% higher.
Keyword ：
Double evaporation Double evaporation Air conditioning Air conditioning Cooling COP Cooling COP Dehumidification Dehumidification
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| GB/T 7714 | Shuxue, Xu , Jianhui, Niu , Hongxia, Ma et al. Cooling and dehumidification performance study of a new air conditioning system with double evaporation temperature [J]. | ENERGY AND BUILDINGS , 2023 , 295 . |
| MLA | Shuxue, Xu et al. "Cooling and dehumidification performance study of a new air conditioning system with double evaporation temperature" . | ENERGY AND BUILDINGS 295 (2023) . |
| APA | Shuxue, Xu , Jianhui, Niu , Hongxia, Ma , Guoyuan, Ma . Cooling and dehumidification performance study of a new air conditioning system with double evaporation temperature . | ENERGY AND BUILDINGS , 2023 , 295 . |
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Abstract ：
Efficient cooling of the trans-critical CO2 vapor compression cycle to improve system performance is a crucial research topic. This paper proposes an innovative approach called distribution compression (DC) to achieve the same effect as subcooling in a trans-critical CO2 thermodynamic cycle. In the DC system, the trans-critical CO2 at the gas cooler outlet is no longer further cooled but subjected to a secondary pressure boost and releases heat in ordinary heat sink conditions as in the gas cooler. Thermodynamics calculated the change in performance of the DC system under different working conditions with different secondary boost ratios. The optimal secondary boost ratio related to evaporation and gas cooler outlet temperatures under optimal discharge pressure based on the baseline system was obtained. The results show that compared with the baseline system, the DC system can effectively improve the system performance, and the maximum refrigeration COP increase is between 8.2 % -10.76 %, and the maximum heating COP increase is between 5.37 % -6.34 %. The cooling or heating capacity increase can reach up to about 26 %. The ideal secondary boost ratio in a DC system is not highly demanding, and the increased input power for the second input power for the secondary boost will not exceed 20 % relative to the baseline system. Comparing the COP of the DC system over current systems that only use a single subcooling technology still shows advantages. The DC system provides a new idea to improve the performance of the transcritical CO2 vapor compression cycle.
Keyword ：
CO2 CO2 Heating Heating Trans-critical cycle Trans-critical cycle Distributed compression Distributed compression Refrigeration Refrigeration Subcooling Subcooling
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| GB/T 7714 | Wang, Lei , Zhang, Yumei , Ma, Guoyuan . Theoretical investigation of a novel distributed compression cycle for CO2 trans-critical system [J]. | ENERGY AND BUILDINGS , 2023 , 304 . |
| MLA | Wang, Lei et al. "Theoretical investigation of a novel distributed compression cycle for CO2 trans-critical system" . | ENERGY AND BUILDINGS 304 (2023) . |
| APA | Wang, Lei , Zhang, Yumei , Ma, Guoyuan . Theoretical investigation of a novel distributed compression cycle for CO2 trans-critical system . | ENERGY AND BUILDINGS , 2023 , 304 . |
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Abstract ：
The indoor space of residential building is limited, especially in building retrofit, to improve the indoor space utilization and the performance of exhaust air heat recovery system, a novel dual-cylinder rotary compressor with independent suction and discharge ports was designed to drive an inverter parallel-loop exhaust air heat pump. Through the experiments and analyzing the parallel-loop exhaust air heat pump system working characteristics under variable compressor frequency and different fresh air volume flow rate, the optimized method is proposed and verified experimentally. Finally, the annual energy efficient operation plan was proposed, and the seasonal performance factor and seasonal average input power under this operation plan in three typical countries/organization were calculated. Results show that the system COP can be greatly improved by applying a mixed air supply method during winter. When the fresh-air-to-return-air ratio is 1:1 and the outdoor temperature is -5 degrees C, the system COP reached 10.18, which is the highest comparing with the related studies. In summer, the system COP is increased by increasing the ventilation volume flow rate. When the operation of the parallel-loop exhaust air heat pump system follows the energy efficient operation plan to ensure the temperature effectiveness over 100% and the outdoor working condition complies with GB 21455-2013, the heating season performance factor, heating season average input power, cooling season performance factor, and cooling season average input power are 7.22, 0.6909 kW, 2.83, and 0.8167 kW, respectively. The work would provide guidance for the development of exhaust air heat recovery system in residential building.
Keyword ：
Seasonal performance factor Seasonal performance factor Air supply method Air supply method Parallel-loop Parallel-loop Exhaust air heat pump Exhaust air heat pump COP COP
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| GB/T 7714 | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng et al. Experimental study and operation optimization of a parallel-loop heat pump for exhaust air recovery in residential buildings [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
| MLA | Jia, Xiaoya et al. "Experimental study and operation optimization of a parallel-loop heat pump for exhaust air recovery in residential buildings" . | JOURNAL OF BUILDING ENGINEERING 45 (2022) . |
| APA | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng , Liu, Shuailing , Wu, Guoqiang , Sui, Qiuyu . Experimental study and operation optimization of a parallel-loop heat pump for exhaust air recovery in residential buildings . | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
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Abstract ：
Free cooling technology can effectively reduce the cooling energy consumption of data centers, but its energy efficiency is greatly affected by regional and meteorological conditions. This study investigates the liquid-pumpdriven free cooling/mechanical refrigeration hybrid cooling system of a data center with 40 racks through a demonstration case and tests. The annual hourly energy efficiency in 20 subclimate zones and 37 typical cities in China of the hybrid cooling system designed with 5 and 10 degrees C temperature differences was analyzed with different meteorological parameters. The annual power usage effectiveness (PUE) values corresponding to the energy efficiency ratio (EER) in different regions were presented. Results showed that the annual average EER of the liquid-pump-driven free cooling mode was 7.07-14.18, and the annual average EER of the hybrid system was 4.22-14.10 when the temperature difference was 5 degrees C. The annual average EER range and the design temperature difference of the hybrid system for different climate regions were recommended. The PUE values of other regions, except for Guangzhou and Haikou, were lower than 1.40. The results provide references for the EER and PUE of the hybrid system in different climate regions.
Keyword ：
Data center free cooling Data center free cooling PUE PUE Climate zone Climate zone Liquid-pump-driven hybrid system Liquid-pump-driven hybrid system EER EER
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| GB/T 7714 | Zhou, Feng , Shen, Chaoya , Ma, Guoyuan et al. Power usage effectiveness analysis of a liquid-pump-driven hybrid cooling system for data centers in subclimate zones [J]. | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS , 2022 , 52 . |
| MLA | Zhou, Feng et al. "Power usage effectiveness analysis of a liquid-pump-driven hybrid cooling system for data centers in subclimate zones" . | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS 52 (2022) . |
| APA | Zhou, Feng , Shen, Chaoya , Ma, Guoyuan , Yan, Xianghui . Power usage effectiveness analysis of a liquid-pump-driven hybrid cooling system for data centers in subclimate zones . | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS , 2022 , 52 . |
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Abstract ：
本实用新型公开了带套管翅片式换热器的热泵系统，由若干个压缩机、四通阀和节流元件，以及两个套管翅片式换热器等组成，套管翅片式换热器套管外侧有翅片，套管的管间侧和内管侧为工质或液体流道，且分别设有一个或多个工质流路，其各自的一个工质流路与压缩机，四通阀和节流元件联接成独立的热泵回路并充注适量的工质，液体流路与配置的外部管路连通。该热泵系统中工质同时与水和空气换热，将供热和供生活热水的功能集成于一套装置，有效降低了造价和安装空间，还能构成二个以上的热泵回路，有效地改善了热泵在大换热温差工况下的能效比。
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| GB/T 7714 | 马国远 , 宮悦轩 , 许树学 et al. 带套管翅片式换热器的热泵系统 : CN202221896213.3[P]. | 2022-07-21 . |
| MLA | 马国远 et al. "带套管翅片式换热器的热泵系统" : CN202221896213.3. | 2022-07-21 . |
| APA | 马国远 , 宮悦轩 , 许树学 , 李富平 . 带套管翅片式换热器的热泵系统 : CN202221896213.3. | 2022-07-21 . |
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本实用新型公开了带风机冷热两用新型换热末端的空气源热泵装置，该装置包括压缩机、新型热管式室内换热器、室外换热器、节流装置、四通换向阀、贯流风机及管路。所述的热泵系统和新型热管式换热器系统充注相同或不同的制冷剂。热管结构是双层结构，并且内管内插入翅片，通风时增强紊流。所述的带风机冷热两用新型换热末端既可以制冷，又可以制热。制冷时，打开贯流风机进行强制对流换热。制热时，关闭贯流风机与空气进行热辐射换热。通过在新型热管换热器的上集管中加一个贯流风机，在双层热管内管内插入翅片，并在外管和内管之间的夹层充注工质，提高了热管辐射换热的利用率和舒适度。
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| GB/T 7714 | 许树学 , 韩婷婷 , 马国远 . 带风机冷热两用新型换热末端的空气源热泵装置 : CN202221106611.0[P]. | 2022-05-09 . |
| MLA | 许树学 et al. "带风机冷热两用新型换热末端的空气源热泵装置" : CN202221106611.0. | 2022-05-09 . |
| APA | 许树学 , 韩婷婷 , 马国远 . 带风机冷热两用新型换热末端的空气源热泵装置 : CN202221106611.0. | 2022-05-09 . |
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Abstract ：
本实用新型公开了水和空气混合压缩式制冷系统，由压缩机、分离器、气换热器、补水阀、喷淋换热器、喷淋泵、液体马达、水换热器、膨胀机、电机等组成，工质为水和空气，压缩机与膨胀机、电机共轴联接，其进口与喷淋换热器、液体马达连接，其出口与分离器连接，分离器中空气经过气换热器和膨胀机后进入喷淋换热器、水经过水换热器后分别接到液体马达和喷淋换热器的补水阀上，喷淋泵循环水在喷淋换热器中喷淋。水和空气混合压缩更接近等温过程，显著降低其压缩功和排气温度，水和空气同为工质，利用膨胀机等元件回收工作流体的压力能，使系统的能效水平进一步提高。
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| GB/T 7714 | 马国远 , 荣维来 , 许树学 et al. 水和空气混合压缩式制冷系统 : CN202221104906.4[P]. | 2022-05-09 . |
| MLA | 马国远 et al. "水和空气混合压缩式制冷系统" : CN202221104906.4. | 2022-05-09 . |
| APA | 马国远 , 荣维来 , 许树学 , 李富平 . 水和空气混合压缩式制冷系统 : CN202221104906.4. | 2022-05-09 . |
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