Results 1 to 10 of about 470 (129)

Investigation on reverse cycle defrosting strategy of an outdoor heat exchanger in air conditioning heat pump system for electric vehicles

Case Studies in Thermal Engineering, 2021
Outdoor heat exchanger in air conditioning heat pump (ACHP) system would frost quickly under a low-temperature but high-humidity surroundings. System performance and efficiency would significantly decrease without a rapid and appropriate defrosting ...
Kang Li, Dingyu Xia, Jiaqian Bao, Shuxian Luo, Hua Zhang, Ni Liu, Lin Su, Lei Sheng   +7 more
doaj   +4 more sources

The modelling of reverse defrosting cycles of air-to-water heat pumps with TRNSYS [PDF]

E3S Web of Conferences, 2019
The most widespread defrosting technique adopted by Air-Source Heat Pumps (ASHPs) during the heating season is Reverse Cycle Defrosting (RCD). In this paper a dynamic model of RCD, based on performance data provided by the heat pump manufacturer ...
Dongellini Matteo, Piazzi Agostino, De Biagi Filippo, Morini Gian Luca   +3 more
doaj   +3 more sources

Review regarding defrosting methods for refrigeration and heat pump systems [PDF]

E3S Web of Conferences, 2021
The paper presents a literature review regarding defrosting methods for household refrigeration and heat pumps. The literature review covers the period between 2008 and 2020. A number of 61 papers have been studied. The literature review was conducted by
Al Douri Jamal, Hmood Kamel S., Apostol Valentin, Pop Horatiu, Alqaisy Saleh J., Beatrice Ibrean Elena   +5 more
doaj   +1 more source

Determination of nitrates in fresh vegetables and their processed products [PDF]

Известия Саратовского университета. Новая серия: Серия Химия. Биология. Экология, 2023
The number of nitro compounds of the anthropogenic origin in the general nitrogen cycle is steadily increasing, which leads to an increase in nitrates in products and increases the nitrate-nitrite load on the human body.
Markova, Ekaterina Олеговна, Dyakov, Michael Yu.   +1 more
doaj   +1 more source

A Heater-Assisted Air Source Heat Pump Air Conditioner to Improve Thermal Comfort with Frost-Retarded Heating and Heat-Uninterrupted Defrosting

Energies, 2021
Frost deposits on the outdoor heat exchanger of an air source heat pump (ASHP) air conditioner and reduces its capacity during winter operation. However, the prevailing reverse-cycle defrosting (RCD) turns the indoor heat exchanger into an evaporator and
Fei Wang, Rijing Zhao, Wenming Xu, Dong Huang, Zhiguo Qu   +4 more
doaj   +1 more source

Research on Defrosting System of Air-source Heat Pump with Liquid Storage Gas-liquid Separator

Zhileng xuebao, 2022
The surface of an outdoor evaporator can easily frost when an air-source heat pump is used for heating during winter. The most common defrosting method, reverse cycle defrosting, has safety risk and long defrosting period.
Ma Longxia, Liu Zixuan, Wang Fenghao, Wang Zhihua, Lou Yechun   +4 more
doaj  

Study on the Segmental Defrosting Performance of Air-source Heat Pumps

Zhileng xuebao, 2023
In this study, a novel defrosting method was developed for an air-source heat pump (ASHP) with a multi-circuit outdoor coil operating in a low-temperature and high-humidity environment.
Huang Tao, Tang Lan, Chen Hai, Liu Xi, Qin Qiuyuan, Liu Ziyuan, Li Baoyin   +6 more
doaj  

Ultrasonic Guided Wave Phased Array Focusing Technology and Its Application to Defrosting Performance Improvement of Air-Source Heat Pumps

Energies, 2019
Previous studies have indicated that a basic frost layer negatively affects the heat-transfer efficiency and is difficult to remove using a single ultrasonic transducer.
Haihui Tan, Xiaofeng Zhang, Li Zhang, Tangfei Tao, Guanghua Xu   +4 more
doaj   +1 more source

Experimental Investigation on the Effects of Vapor Injection on Defrosting Performance Improvement of Quasi-two Stage Compression Air-source Heat Pumps

Zhileng xuebao, 2023
During reverse-cycle defrosting of an air-source heat pump, the defrosting time is always long owing to insufficient heat sources. For the quasi-two stage compression air-source heat pump (QTASHP), owing to its larger outdoor coil operated at lower ...
Wei Wenzhe, Xu Lintong, Liu Xuchen, Ni Long, Song Yiping, Wu Lintao   +5 more
doaj  

Research Progress on Superhydrophobic Surface Technology for Air-Source Heat Pump Frosting Control: Mechanisms, Fabrication, and Applications

Energies
As a key technology for achieving building heating electrification and decarbonization, the air-source heat pump (ASHP) has long been constrained by outdoor heat exchanger frosting in cold and humid regions. Frosting leads to increased thermal resistance,
Bin Liu, Zhiping Yuan
doaj   +1 more source