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学者姓名：马国远
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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 ：
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 ：
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 ：
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 ：
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 ：
A mechanically-driven loop heat pipe heat rec?overy system by booster and refrigerant pump was proposed to match the all-year fresh air load varying greatly with ambient temperature in an energy recovery ventilation unit and enhance its energy-saving potentials. The system prototype was developed and the experimental setup established in which the booster and pump can operate together or separately. Namely, the prototype could be running in pump-driven loop heat pipe (PLHP) mode, booster-driven loop heat pipe (BLHP) mode or booster combining with pump-driven loop heat pipe (CLHP) mode. The heat transfer characteristics of the prototype running in these three modes under winter and summer conditions were studied, respectively. The results showed that the temperature effectiveness of CLHP was greater than that of PLHP or BLHP under all-year conditions. When outdoor temperature is -15 ?degrees C, the temperature effectiveness of CLHP is 78.0% and 52.5% higher than that of PLHP and BLHP, respectively, and the heating EER of CLHP is 29.6% higher than that of BLHP. When outdoor temperature is 40 ?degrees C, the CLHP has 19.5% higher of temperature effectiveness and 21.7% higher of cooling EER comparing with the BLHP, respectively. In winter, BLHP performs better when outdoor temperature is greater than 7.5 ?degrees C while CLHP performs better when outdoor temperature is lower than 7.5 ?degrees C. And BLHP has better performance when outdoor temperature is lower than 35 ?degrees C in summer while CLHP performs better when outdoor temperature is higher than 35 ?degrees C. The composite system can switch its operating mode according to the fresh air load, which can improve effectively the year-round performance of the system to recover heat in building ventilation.
Keyword ：
Heat pipe Heat pipe Heat recovery Heat recovery Refrigerant pump Refrigerant pump Ventilation Ventilation Booster Booster
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| GB/T 7714 | Liu, Shuailing , Ma, Guoyuan , Jia, Xiaoya et al. Performance of a mechanically-driven loop heat pipe heat recovery system [J]. | APPLIED THERMAL ENGINEERING , 2022 , 207 . |
| MLA | Liu, Shuailing et al. "Performance of a mechanically-driven loop heat pipe heat recovery system" . | APPLIED THERMAL ENGINEERING 207 (2022) . |
| APA | Liu, Shuailing , Ma, Guoyuan , Jia, Xiaoya , Xu, Shuxue , Wu, Guoqiang . Performance of a mechanically-driven loop heat pipe heat recovery system . | APPLIED THERMAL ENGINEERING , 2022 , 207 . |
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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 ：
A novel dual-cylinder rotary compressor was designed to improve the indoor space utilization, and it was used to drive a parallel-loop exhaust air heat pump (PEAHP) which integrates the functions of heating, cooling, ventilation and heat recovery. The operation characteristics of the system in different compressor frequencies and different fresh-air-to-return-air ratios (FRRs) were studied and analyzed experimentally. Through the simulation of the ultra-low energy buildings (ULEBs) in 12 cold zone cities, the hourly (8760 h) building thermal loads in the whole year are calculated. On the basis of the matching of the hourly system working characteristics and the thermal loads of ULEB, the energy efficient working strategy is proposed. Finally, the applicability and energy consumption of the PEAHP system applying in ULEBs were analyzed. The results show that, the system heating/ cooling capacity and COP can be considerably improved by increasing return air volume flow rate. In winter, under the working condition of 50 Hz-FRR 1:1, the peak heating capacity and COP are 8.94 kW and 9.63, respectively, which are 77.38% and 64.05% higher than those when FRR is 1:0. In summer, when the outdoor temperature ranges from 26 ?to 40 ?, the system temperature effectiveness is higher than 1 in all working modes. The PEAHP system has great applicability for ULEBs in cold zone of China during winter, and the system can meet the year-round use demands of the ULEBs in Taiyuan, Dalian, Lanzhou, Yinchuan and Lhasa, with the unsatisfied heating/cooling time ratio of 1.61%, 0.09%, 0.006%, 2.45% and 0.02%, respectively.
Keyword ：
Energy consumption Energy consumption Heat recovery Heat recovery COP COP Ultra-low energy building Ultra-low energy building Exhaust air heat pump Exhaust air heat pump
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| GB/T 7714 | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng et al. The applicability and energy consumption of a parallel-loop exhaust air heat pump for environment control in ultra-low energy building [J]. | APPLIED THERMAL ENGINEERING , 2022 , 210 . |
| MLA | Jia, Xiaoya et al. "The applicability and energy consumption of a parallel-loop exhaust air heat pump for environment control in ultra-low energy building" . | APPLIED THERMAL ENGINEERING 210 (2022) . |
| APA | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng , Liu, Shuailing , Wu, Guoqiang , Sui, Qiuyu . The applicability and energy consumption of a parallel-loop exhaust air heat pump for environment control in ultra-low energy building . | APPLIED THERMAL ENGINEERING , 2022 , 210 . |
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Abstract ：
To improve the thermal performance of the air-to-air energy recovery devices in cold climates, especially in low temperature conditions, a novel integrated system with heat recovery combining pump-driven loop heat pipe and heat pump is proposed and studied. The energy recovery device can operate separately at three modes: pump-driven loop heat pipe mode, heat pump mode or integrated mode. Results show that the temperature effectiveness and energy efficiency ratio of the integrated system are higher than that of heat pump system in whole conditions, and the heat transfer capacity of the integrated system has a positive correlation with the fresh air load. In addition, the system can switch its operating modes according to the different outdoor temperature. In test conditions, when outdoor temperature is greater than 8.7 degrees C or lower than 35.8 degrees C, heat pump system performs better, otherwise the integrated system is more suitable. Compared with others systems, the novel integrated system has better performance in all-year, especially in low temperature conditions. The novel integrated system shows a good application prospect in energy-saving buildings.
Keyword ：
Ventilation heat recovery Ventilation heat recovery Switch temperature Switch temperature Integrated Integrated Pump-driven loop heat pipe Pump-driven loop heat pipe Heat pump Heat pump
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| GB/T 7714 | Liu, Shuailing , Ma, Guoyuan , Xu, Shuxue et al. Experimental study of ventilation system with heat recovery integrated by pump-driven loop heat pipe and heat pump [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 52 . |
| MLA | Liu, Shuailing et al. "Experimental study of ventilation system with heat recovery integrated by pump-driven loop heat pipe and heat pump" . | JOURNAL OF BUILDING ENGINEERING 52 (2022) . |
| APA | Liu, Shuailing , Ma, Guoyuan , Xu, Shuxue , Jia, Xiaoya , Wu, Guoqiang . Experimental study of ventilation system with heat recovery integrated by pump-driven loop heat pipe and heat pump . | JOURNAL OF BUILDING ENGINEERING , 2022 , 52 . |
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Abstract ：
Based on the simulation results of the typical rural ultra-low energy building (ULEB) in five different climatic regions of China, three indicative technical pa-rameters for paralleled-loop exhaust air heat pump (PEAHP) R&D which are nominal heating-cooling capacity, maximum required fresh air to return air ratio (MFRR) and system energy efficiency grades were calculated and summarized ac-cording to the demand of indoor thermal comforts by using statistic method. The nominal heating-cooling capacities were determined according to the peak loads, which are 6.84-2.01 kW, 5-2.96 kW, 3.9-4.6 kW, 3.08-5.02 kW, and 3.4-0.46 kW in the ULEB of Harbin, Beijing, Shanghai, Guangzhou, and Kunming, respectively. To ensure both thermal comforts and energy conservation, during the heating sea-son, full fresh air supply is suggested in Beijing and the 1:0.5 MFRR is suggested in Harbin, Shanghai, Guangzhou, and Kunming. During the cooling season, the 1:5 MFRR is suggested in Shanghai and Guangzhou, the 1:3, 1:1.5, and 1:0.5 MFRR are suggested in Harbin, Beijing and Kunming, respectively. The PEAHP energy efficiency grades 1 similar to 5 are 7.92 similar to 11.7, 7.58 similar to 11.5, 7.5 similar to 11.35, 6.12 similar to 9.27, and 4.64 similar to 7.03 during the heating season of Harbin, Beijing, Shanghai, Guangzhou, and Kunming, respectively, and are 2.33 similar to 3.54, 3.93 similar to 5.96, 4.61 similar to 6.98, 4.62 similar to 6.99, and 2.04 similar to 3.1 for the cooling season, respectively.
Keyword ：
ULEB ULEB nominal cooling capacity nominal cooling capacity heat recovery heat recovery exhaust air heat pump exhaust air heat pump
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| GB/T 7714 | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng et al. TECHNICAL REQUIREMENTS ANALYSIS OF INTEGRATED PARALLELED-LOOP EXHAUST AIR HEAT PUMP SYSTEM APPLIED TO ULTRA-LOW ENERGY BUILDING IN DIFFERENT CLIMATIC REGIONS OF CHINA [J]. | THERMAL SCIENCE , 2022 , 26 (5) : 3911-3922 . |
| MLA | Jia, Xiaoya et al. "TECHNICAL REQUIREMENTS ANALYSIS OF INTEGRATED PARALLELED-LOOP EXHAUST AIR HEAT PUMP SYSTEM APPLIED TO ULTRA-LOW ENERGY BUILDING IN DIFFERENT CLIMATIC REGIONS OF CHINA" . | THERMAL SCIENCE 26 . 5 (2022) : 3911-3922 . |
| APA | Jia, Xiaoya , Ma, Guoyuan , Zhou, Feng , Wang, Lei , Wu, Guoqiang , Liu, Shuailing . TECHNICAL REQUIREMENTS ANALYSIS OF INTEGRATED PARALLELED-LOOP EXHAUST AIR HEAT PUMP SYSTEM APPLIED TO ULTRA-LOW ENERGY BUILDING IN DIFFERENT CLIMATIC REGIONS OF CHINA . | THERMAL SCIENCE , 2022 , 26 (5) , 3911-3922 . |
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