A solar-air source heat pump with thermosiphon to efficiently utilize solar energy

Ran, Siyuan; Lyu, Weihua; Li, Xianting; Xu, Wei; Wang, Baolong

doi:10.1016/j.jobe.2020.101330

Cited by 24 publications

(8 citation statements)

References 35 publications

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“…However, severe frosting occurs on the evaporator side resulting from the strong cold air in the north [ 7 ], which not only increases the heat transfer resistance of the evaporator, but also increases the wind resistance of the heat exchanger. As a result, the evaporation temperature and condensation temperature decrease, and heating capacity and the energy efficiency ratio decline [ 8 ], severely restricting the promotion of air source heat pumps in different regions [ 9 ]. Air source heat pump is a device that uses air as a low-grade heat source to obtain high-grade heat, it is important heating equipment.…”

Section: Introductionmentioning

confidence: 99%

Analysis on frosting of heat exchanger and numerical simulation of heat transfer characteristics using BP neural network learning algorithm

Yu¹,

Luo²,

Chu

2021

PLoS ONE

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The study is aimed at the frosting problem of the air source heat pump in the low temperature and high humidity environment, which reduces the service life of the system. First, the frosting characteristics at the evaporator side of the air source heat pump system are analyzed. Then, a new defrost technology is proposed, and dimensional theory and neural network are combined to predict the transfer performance of the new system. Finally, an adaptive network control algorithm is proposed to predict the frosting amount. This algorithm optimizes the traditional neural network algorithm control process, and it is more flexible, objective, and reliable in the selection of the hidden layer, the acquisition of the optimal function, and the selection of the corresponding learning rate. Through model performance, regression analysis, and heat transfer characteristics simulation, the effectiveness of this method is further confirmed. It is found that, the new air source heat pump defrost system can provide auxiliary heat, effectively regulating the temperature and humidity. The mean square error is 0.019827, and the heat pump can operate efficiently under frosting conditions. The defrost system is easy to operate, and facilitates manufactures designing for different regions under different conditions. This research provides reference for energy conservation, emission reduction, and sustainable economic development.

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Section: Introductionmentioning

confidence: 99%

Analysis on frosting of heat exchanger and numerical simulation of heat transfer characteristics using BP neural network learning algorithm

Yu¹,

Luo²,

Chu

2021

PLoS ONE

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“…[ 40 ] To model it, a resistance–capacitance model based on electric‐thermal equivalence is presented in the study by Rullof et al [ 40 ] and applied to a transcritical CO 2 SAHP. Another approach is followed in Ran et al [ 41 ] In this study, the heat pump uses a multifunction evaporator that can work with both air and solar energy sources according to solar availability. All the operations are realized through a single evaporator/collector.…”

Section: Solar‐coupled Vapor‐compression Heat Pumps For Space Heating...mentioning

confidence: 99%

“…On the contrary, the most appropriate strategy is to use the finned tube evaporator with solar irradiations between 50 and 100 W m −2 , while for higher solar radiations the evaporator of solar collectors has a better heat transfer capacity and should be preferred. The research described in the study by Ran et al [ 41 ] also proposes a solar evaporator that can work in three modes: solar heat source, air source, or thermosyphon mode to directly provide space heating, thus having a compact installation without losing the advantage of the dual‐source configuration. Results of the numerical analysis with this system show that the energy saving rates can reach 48% and 66% compared with air source heat pump and the conventional solar heating system, respectively.…”

Section: Solar‐coupled Vapor‐compression Heat Pumps For Space Heating...mentioning

confidence: 99%

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

2022

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Solar‐assisted heat pumps have the potential to increase the share of renewables in the energy systems for several cases, or to increase the flexibility of smart grids and integrated thermal‐electric grids. The development of such systems requires a comprehensive approach in which technical, market, and social acceptance are all tackled at the same time. Such a holistic approach is the main objective of the present review article. To do so, an investigation is performed by categorizing the integration approaches reported in the literature, exploiting the solar source either as a low‐temperature evaporator source or as supporting the condenser during heating operation. Furthermore, hybrid integration schematics and dual‐source approaches are discussed. Market and social aspects complete the analysis, with the aim of finally identifying the current status; the main drivers and challenges are also addressed. The reported results confirm that the exploitation of solar thermal energy can increase the achievable performance of heat pumps in a broad range of climates. A favorable regulatory/financial framework and informative campaigns for businesspersons and the wide public have been identified as the main solutions to maximize the deployment of the technology in the coming years.

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“…Kong et al (2018b), designed and built a variable capacity direct expansion solar assisted heat pump and conducted a series of experiments to monitor the autumn and winter thermal performance. Ran et al (2020) designed an efficient integrated solar-air source heat pump that operated on thermosiphon phenomenon and their results revealed that the system was more efficient than their counterpart conventional system with a payback period ranging from 2.7 to 4.4 years for typical cities. T. Long et al (2020) conducted a study on the performance and optimization of the key design parameters of a solar assisted solar heat pump (SASHP) in Tibetan climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Design and monitoring of a hybrid energy system: performance analysis and modelling

Tangwe

Sikhonza

2021

Cogent Engineering

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The utilization of a hybrid energy system (combined solar water heater (SWH) and an air source heat pump (ASHP) water heater) can result in over 80% reduction in the electrical energy consumed as the system is capable to operate with an energy factor of above 4.0. A major challenge is to develop credible methodology or mathematical model to predict energy savings. The research focused on the design and installation of a hybrid energy system and a data acquisition system to monitor its performance. The average weekday volume of hot water consumed, thermal energy gained by water in the tank of the air source heat pump (ASHP) water heater, electrical energy consumed, and the COP were 225.03 L, 5.25 kWh, 1.52 kWh, and 3.50. The average weekday global solar radiation, ambient temperature, solar fraction of the solar water heater (SWH) and the energy factor of the hybrid energy system were 579.67 W/m 2 , 23.58°C, 0.52, and 4.02, respectively. A multiple linear regression model was developed to predict the energy factor of the

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A solar-air source heat pump with thermosiphon to efficiently utilize solar energy

Cited by 24 publications

References 35 publications

Analysis on frosting of heat exchanger and numerical simulation of heat transfer characteristics using BP neural network learning algorithm

Analysis on frosting of heat exchanger and numerical simulation of heat transfer characteristics using BP neural network learning algorithm

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

Design and monitoring of a hybrid energy system: performance analysis and modelling

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