PERFORMANCE OF A HEAT PUMP USING DIRECT EXPANSION SOLAR COLLECTORS1Paper presented at the ISES Solar World Congress, Taejon, South Korea, 24–29 August 1997.1

Ito, Sadasuke; Miura, Naokatsu; Wang, K.

doi:10.1016/s0038-092x(98)00124-8

Cited by 101 publications

(6 citation statements)

References 4 publications

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“…In order to ensure the safe and stable operation of the system under the most disadvantageous outdoor climatic condition (such as bad weather conditions), the daily average solar radiation in the coldest month (January) was 9937 kJ•m −2 •d −1 according to the meteorological parameters of typical years in Xi'an, with a southern direction and a tilt angle of 59 • [42]. According to the results found in previous research [43,44], the collector efficiency was 75%, and the heat coefficient of the heat pump was 2.8 [45,46]. Thus, if the daily heating load of the system (10 7 kJ) was needed, the daily heat-collecting capacity of the solar collector should be 6.42 × 10 6 kJ•d −1 .…”

Section: Design Parameters Of the Serial Modementioning

confidence: 99%

Performance Analysis of a Combined Solar-Assisted Heat Pump Heating System in Xi’an, China

Huan

Wang

et al. 2019

Energies

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This study proposed a combined solar-assisted heat pump (SAHP) system that could operate in the serial mode or parallel mode. For this proposed system, a stable year-round operation could be achieved without the assistance of electric heating or low-temperature heat pump. By analyzing the heat balance equations, a correlation of the combined SAHP system for the two modes switched was obtained, which provided a theoretical basis for the optimal operation of this system. In addition, the performance of the proposed system applied in a university bathroom in Xi’an district was investigated using TRNSYS. The results illustrated that compared to the serial and parallel systems, the proposed system exhibited a good performance on energy efficiency. The annual average coefficient of performance (COP) of the proposed system was 5.7, obviously higher than those of the serial system and the parallel system, which were 3.3 and 4.3, respectively. Therefore, the results in this study could provide the theoretical guidance and reference for practical engineering design.

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Section: Design Parameters Of the Serial Modementioning

confidence: 99%

Performance Analysis of a Combined Solar-Assisted Heat Pump Heating System in Xi’an, China

Huan

Wang

et al. 2019

Energies

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“…Since the front cover temperature tends to be lower in double-pass design, it is shown to have a better thermal performance. Ito et al (1999) perform theoretical and experimental studies to investigate the performance of heat pump consisted of a flat-plate collector deployed as an evaporator in the thermodynamic cycle. Choudhury and Garg (1993) evaluate the advantage of using packing above the back plate in the flow passage for the air based HPV/T systems by comparing their overall yields.…”

Section: Theoretical Background Of Photovoltaic Unitsmentioning

confidence: 99%

Hybrid Photovoltaic/Thermal (HPV/T) Systems: From Theory to Applications

Cüce¹,

Oztekin²,

Cuce³

2018

Energy Research Journal

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Hybrid photovoltaic/ thermal systems are very promising clean energy harvesting devices where they can be used either standalone system or can be incorporated with other systems. In this study, historical developments leading to current Hybrid Photovoltaic/Thermal (HPV/T) systems as it is used today and global findings to enhance the performance of HPV/T system through state-of-the-art analyses are presented in a thematic way. The findings from initial studies on the HPV/T systems is revealed in an historical way and rest of sections are formed based on selected criteria. The paper covers basic and advanced type collectors, working fluids, analyzing methods to assess performance, thermodynamic approaches, optimization of design parameters and mass flow rates, techniques to enhance performance and comparative studies. Especially, various parametric studies to optimize performance of the HPV/T with respect to selected parameters including different types of absorbers, packing factor, cooling schemes, working fluid types, modifications at different sections of the system are comprehensively investigated. Based on the conclusions, the variation in electrical and thermal efficiencies are mainly in the scope of this study. It is observed from the literature that solar HPV/T system has a great potential to be one of the up and coming clean energy technology.

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“…Direct expansion SB-HPWH system For the direct-expansion approach, refrigerant is circulated directly through the solar collectors (O'Dell et al, 1984, Y.W. Li, December 2007, Ito et al, 1999, Ito et al, 2005, Kuang and Wang, 2006, Chow et al, 2010. And the absorber of the solar collector becomes evaporator directly.…”

Section: Solar Boosted Heat Pumpmentioning

confidence: 99%

An overview of holistic approach to achieve net zero energy residential building retrofit

Qu¹,

Chen²,

Riffat³

2018

EasyChair Preprints

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In this review, we focus on the holistic approach technologies and strategies of energy-efficient residential building retrofitting. Besides, energy balance between both energy demand side and renewable energy supply side are discussed with the integration of different renewable energy technologies, such as advanced insulation, high efficient heat pump, solar aided energy system, combined heat and power plants, dynamic control strategies. Moreover, this review especially focused on the retrofitting problems and challenges of traditional residential buildings which is mostly built before 1960s, which accounts for 14.5% of the overall 〖CO〗_2 emission based on 2015 levels. Combined with these retrofit technologies, several reference residential building cases in Europe are analysed, indicating six main problems from pre-retrofit simulation to retrofit operation process that obstacle the retrofitting performance. To bridge the performance gaps, this review discussed the building performance simulation models and optimization algorithms. The optimization function have mathematical characters of multi-objective, multi-variability, multi-disciplinary, multi-constrained (4M) with discrete, non-linear characteristics. Applying the optimization strategies model is an essential to build a deep understanding between building performance simulation (BPS) and building performance optimization (BPO), which help us to make an optimised holistic retrofitting decisions.

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PERFORMANCE OF A HEAT PUMP USING DIRECT EXPANSION SOLAR COLLECTORS1Paper presented at the ISES Solar World Congress, Taejon, South Korea, 24–29 August 1997.1

Cited by 101 publications

References 4 publications

Performance Analysis of a Combined Solar-Assisted Heat Pump Heating System in Xi’an, China

Performance Analysis of a Combined Solar-Assisted Heat Pump Heating System in Xi’an, China

Hybrid Photovoltaic/Thermal (HPV/T) Systems: From Theory to Applications

An overview of holistic approach to achieve net zero energy residential building retrofit

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