Analysis and determination of a seasonal performance evaluation for air source heat pumps

Yang, Zixu; Xiao, Hansong; Shi, Wenxing; Zhang, Mingsheng; Wang, Baolong

doi:10.1016/j.jobe.2021.102574

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…The largest amount of energy had to be supplied to the building located in Stockholm -the northernmost city, and the smallest in Seville -the south westernmost city. This confirms the assumption presented, for example, in [6] that climatic conditions are important when assessing the advisability of using renewable energy sources in residential buildings.…”

Section: Discussionsupporting

confidence: 89%

“…Air-source heat pump absorbs heat from the outside air and transfers it to the inside of the building. Therefore, its efficiency is significantly affected by outside conditions, especially the outdoor dry bulb temperature [6]. This device is most suitable for larger radiators or underfloor water heating systems, because it produces the heat that is cooler than conventional oil or gas boiler heat [5].…”

Section: Introductionmentioning

confidence: 99%

“…The performance assessment of the ASHP system was also presented in [6], where the authors defined, among others, a way to evaluate the performance using a new APF or IPLV indicators.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Heat Pumps Efficiency in Selected Locations – A Case Study

Ołtarzewska

Krawczyk

2022

Environmental and Climate Technologies

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Heat pumps are increasingly popular in individual buildings and could help to meet expectations of ambitious energy-environmental European goals until 2050. This paper presents the results of energy simulations conducted in TRNSYS for a single-family building depending on its location in selected European cities. For each city, air source heat pump (ASHP) was considered as an energy source for heating and cooling the building, and then an economic analysis was carried out including investment costs of air source heat pump and a comparison of operating costs of ASHP with other alternatives (i.e. gas boiler, oil boiler, or air conditioners). The results of the simulations showed that with the current energy prices the use of air source heat pumps is the most beneficial in temperate warm transitional climate (Krakow). It was also indicated that the implementation of special tariffs (reduced prices) for electricity that supplies renewable energy devices would make heat pumps unmatched as a source of heating and cooling in the residential sector.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Analysis of Heat Pumps Efficiency in Selected Locations – A Case Study

Ołtarzewska

Krawczyk

2022

Environmental and Climate Technologies

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“…However, this mechanical device, locally used as auxiliary power in the building, requires additional energy to drive it [13][14][15]. According to a survey, the energy efficiency of air conditioning heat pumps improved by 2.2 from 1985 to 2005, while it improved by only 0.8 from 2005 to 2015 [16]. In other words, the energy efficiency ratio of the technical means of mechanically assisted natural ventilation is close to the theoretical limit.…”

Section: Introductionmentioning

confidence: 99%

Thinking of Green, Low Carbon, and Energy-Saving Designs Based on the Variable Ventilation of Natatoriums: Taking the Jiading Natatorium of Tongji University as an Example

Qian,

Shi,

Yang

2024

Sustainability

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With the increasing demand for sports activities, sports architecture is flourishing. Creating a comfortable and healthy fitness environment while reducing energy consumption has become a focus for architects. Taking the Jiading Natatorium at Tongji University in Shanghai as an example, this study researched green energy in the variable ventilation of sports venues. The Autodesk Ecotect Analysis 2011 was used to conduct computational fluid dynamics (CFD) simulation analyses on four scenarios of opening and closing the swimming pool’s roof, with ventilation velocity as the primary evaluation indicator to assess the ventilation environment of each scenario. The relationship between the opening ratio of the roof and the ventilation environment of sports buildings was explored. The results showed that when the opening ratio is 37.5%, it achieves good ventilation effectiveness and avoids excessive wind pressure. The study also summarized six common forms of opening and closing roof structures and compared the differences in wind environments of different roof forms. The results indicated that the shape and opening ratio of the roof has a decisive impact on the distribution of indoor wind speed in buildings. Six optimal opening ratios for different roof forms in summer and suitable site conditions were summarized, providing a reference for the design and selection of swimming pool roofs. Furthermore, the wind speed distribution of different roof types showed a trend of gradually becoming uniform with the increase in opening area. However, the position of the wind speed peak is related to the form and size of the roof opening. This research provides valuable references for the low carbon and energy-efficient design of future swimming pool sports buildings.

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“…thermal stress and stress in casting contribute to the cracking of grey cast iron during casting process. However, the variation in the casting structure will lead to the differences we have in strength and hardness of the casting (Zhao et al, 2019;. Basically, the presence of graphite flakes in grey cast iron improves the metal matrix and this equally helps in improving the machinability of the material.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evaluations of mild steel and HT250 grey cast iron in ethanol environment

Salawu,

Shittu,

Afolalu

et al. 2023

Nig. J. Technol. Dev.

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The study focused on the response of mild steel and HT250 grey cast iron in varying ethanol concentration. First, a robust review of both materials’ behaviour under different environment was established using microstructural evolutions. Secondly, 30 × 30 × 10 mm dimension of both materials were employed in the study by immersing them in varying ethanol concentrations of BG-43 %, ESG- 42 %, CG-43 %, SQD- 42 % using distilled water as control. The microstructural behaviour showed that every of the sample responded according to the medium of interaction (ethanol). The degree of surface damage also depends on the ethanol concentration and the heavy presence of Fe and oxygen especially in that of grey cast iron. Corrosion cracks and deposits can be attributed to the reaction between the surface and the ethanol. Thus, environment of application is important in material selection. Results suggests that the microstructural changes provide to the material scientist the qualitative corrosion information of these materials in different environment. Conclusively, the study has enlightened the design engineers and material specialist on the need for proper material selection during engineering design.

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Analysis and determination of a seasonal performance evaluation for air source heat pumps

Cited by 8 publications

References 10 publications

Analysis of Heat Pumps Efficiency in Selected Locations – A Case Study

Analysis of Heat Pumps Efficiency in Selected Locations – A Case Study

Thinking of Green, Low Carbon, and Energy-Saving Designs Based on the Variable Ventilation of Natatoriums: Taking the Jiading Natatorium of Tongji University as an Example

Microstructural evaluations of mild steel and HT250 grey cast iron in ethanol environment

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