Готові списки джерел за темами / Hot gas defrosting

Добірка наукової літератури з теми "Hot gas defrosting"

Автор: Grafiati
Опубліковано: 19 червня 2021
Оновлено: 4 лютого 2022

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Зміст

  1. Статті в журналах
  2. Дисертації

Статті в журналах з теми "Hot gas defrosting":

1

Huang, Dong, Quanxu Li, and Xiuling Yuan. "Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump." Applied Energy 86, no. 9 (September 2009): 1697–703. http://dx.doi.org/10.1016/j.apenergy.2008.11.023.

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2

GUO, XIAN-MIN, YA-JING WANG, WEN-CHENG FU, and XIANG-CHENG TAO. "EXPERIMENTAL STUDY ON A NOVEL DEFROST CYCLE FOR AIR SOURCE HEAT PUMP." International Journal of Air-Conditioning and Refrigeration 18, no. 01 (March 2010): 77–84. http://dx.doi.org/10.1142/s2010132510000095.

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On the basis of the hot-gas bypass defrost cycle, a new defrost method for air source heat pump is proposed. In the new defrost cycle, the outdoor heat exchanger is divided into two parts which are connected by a capillary tube. The front and rear parts of the heat exchanger are used as the evaporator and condenser respectively during defrosting, and can be defrosted orderly by using the four-way valve. The defrosting performance of the new cycle is investigated experimentally and the results are compared with that of the reverse-cycle defrost system. The experimental results indicate that the energy is used more efficiently in the new defrost cycle, therefore, the defrosting duration and losses are less than those of the reverse-cycle defrost system. Moreover, it does not extract heat from the indoor space during defrosting in terms of the new defrost cycle. Compared with the reverse-cycle defrost system, it is found that the switching times of the four-way valve in the new defrost system are the same, and the fluctuation of the discharge and suction pressures during the defrosting is much less than that in the reverse-cycle defrosting, hence, the mechanical impact on the system is much less.
3

Mago, P. J., and S. A. Sherif. "Effect of face velocity during refrigeration on hot-gas coil-defrosting near-saturated conditions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 12 (December 1, 2004): 1507–16. http://dx.doi.org/10.1243/0954406042690524.

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The heat input required to defrost coils within refrigerated spaces is partially removed with the melt, partially warms the coil and refrigerant and partially escapes to the refrigerated space as sensible heat by convection and radiation and as latent heat by evaporation and sublimation. The evaporated and sublimated portions return again both as a refrigeration load and as part of another defrosting cycle. A previous study by the authors showed that the evaporated and sublimated portions are much larger than originally thought relative to the melted portion. While the previous study considered only a coil-face velocity of 3.81 m/s (750ft/min), the focus of this study is to vary the coil-face velocity during the refrigeration portion of the refrigeration/defrost (R/D) cycle and examine their effect on the defrosting process. This study also examines the differences between the types of frost that form at different coil-face velocities during the operation of freezers near saturated or under supersaturated freezer air conditions. Some of the quantities analysed include the defrost efficiency and the fan defrost contribution.
4

Hu, Bin, Dongfang Yang, Feng Cao, Ziwen Xing, and Jiyou Fei. "Hot gas defrosting method for air-source transcritical CO 2 heat pump systems." Energy and Buildings 86 (January 2015): 864–72. http://dx.doi.org/10.1016/j.enbuild.2014.10.059.

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5

Al Douri, Jamal, Kamel S. Hmood, Valentin Apostol, Horatiu Pop, Saleh J. Alqaisy, and Elena Beatrice Ibrean. "Review regarding defrosting methods for refrigeration and heat pump systems." E3S Web of Conferences 286 (2021): 01012. http://dx.doi.org/10.1051/e3sconf/202128601012.

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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 dividing the defrost methods into passive and active. Passive methods involve surface coating and off-cycle. The active defrost methods involve reverse cycle, ultrasonic vibration, hot–gas defrost, electric heating and hot fluid. Surface coating and ultrasonic vibration are recent defrost methods proposed in the literature. Also, recently, phase change materials have been used in household refrigerators to improve their efficiency. This is a topic that needs further investigation and is a subject of interest as it can lead to lower energy consumption during defrost cycles. From the present study, the research direction regarding the use of PCMs in defrost cycles can be highlighted.
6

Choi, Hwan-Jong, Byung-Soon Kim, Donghoon Kang, and Kyung Chun Kim. "Defrosting method adopting dual hot gas bypass for an air-to-air heat pump." Applied Energy 88, no. 12 (December 2011): 4544–55. http://dx.doi.org/10.1016/j.apenergy.2011.05.039.

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7

Xi, Zhanli, Runming Yao, Jinbo Li, Chenqiu Du, Zixian Yu, and Baizhan Li. "Experimental studies on hot gas bypass defrosting control strategies for air source heat pumps." Journal of Building Engineering 43 (November 2021): 103165. http://dx.doi.org/10.1016/j.jobe.2021.103165.

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8

Wang, Yikai, Zuliang Ye, Yulong Song, Xiang Yin, and Feng Cao. "Experimental investigation on the hot gas bypass defrosting in air source transcritical CO2 heat pump water heater." Applied Thermal Engineering 178 (September 2020): 115571. http://dx.doi.org/10.1016/j.applthermaleng.2020.115571.

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9

Ye, Zuliang, Yikai Wang, Xiang Yin, Yulong Song, and Feng Cao. "Comparison between reverse cycle and hot gas bypass defrosting methods in a transcritical CO2 heat pump water heater." Applied Thermal Engineering 196 (September 2021): 117356. http://dx.doi.org/10.1016/j.applthermaleng.2021.117356.

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10

Wang, Zhiyi, Hongxing Yang, and Song Chen. "Study on the operating performance of cross hot-gas bypass defrosting system for air-to-water screw heat pumps." Applied Thermal Engineering 59, no. 1-2 (September 2013): 398–404. http://dx.doi.org/10.1016/j.applthermaleng.2013.06.007.

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Дисертації з теми "Hot gas defrosting":

1

Ausmeel, Erik, and Botvid Gannholm. "Dataanalys av en ny avfrostningsrutin på en kyl- och frysanläggning : En studie gjord hos Freezing Food Småland Öland AB." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105008.

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Den här rapporten handlar om en ändring i livsmedelsföretaget Freezing Food Småland Öland AB:s avfrostningsrutin för deras förångare i frysrummet. Ändringen gick ut på att avfrostningstiden och maxtemperaturen sänktes samt att tiden mellan avfrostningarna nu sker varannan i stället för varje natt. Syftet var att undersöka om ändringen av rutinen hade bidragit till en minskad energiförbrukning i förhållande till innan ändringen gjordes genom att också granska andra faktorer än själva avfrostningen som kunde tänkas påverka energiförbrukningen. Metoden gick ut på att insamla och analysera stora datamängder tillhandahållna av företaget för att sedan reducera dem till hanterbara siffror. Även data för lokala utomhustemperaturer samlades in. Med hjälp av detta beräknades medelvärden för en given tidsperiod för energiförbrukning, lagerhållning och utomhustemperatur. Resultatet visade en sänkning av energiförbrukningen, hur stor andel som berodde på avfrostningens ändrade rutiner lämnade undersökningen obesvarat. Utomhustemperaturen bör ha minskat effektbehovet, samtidigt bör lagerhållningen ökat den. Slutsatsen blev att mer tid behövde passera och en ny undersökning behöver framställas efter att avfrostningsrutinen ändrades för att möjliggöra en säkrare bedömning.
This report is about a change in the food company Freezing Food Småland Öland AB’s defrosting routine for their evaporators in the freezer warehouse. The change was that the defrosting time and maximum temperature were reduced and that the time between defrostings now takes place every other night instead of every night. The aim was to examine whether the change in the routine had contributed to a reduction in energy consumption compared to before the change was made by also examining factors other than defrosting itself that might affect energy consumption. The method was to collect and analyze large amounts of data provided by the company and then reduce them to manageable figures. Data for local outdoor temperatures were also collected. This calculated averages for a given time period for energy consumption, warehousing and outdoor temperature. The results showed a decrease in energy consumption, the proportion due to the change in defrosting procedures left the investigation unanswered. The outdoor temperature should have reduced the power requirement, at the same time the storage should have increased it. It was concluded that more time needed to pass,and a new study needed to be produced after the defrosting routine was changed to allow for a safer assessment.
2

Yan, Li. "Simulation of hot gas defrosting of evaporators." Thesis, 1990. http://spectrum.library.concordia.ca/4233/1/MM59178.pdf.

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