Experimental investigation and feasibility analysis on a capillary radiant heating system based on solar and air source heat pump dual heat source

Zhao, Min; Gu, Zhaolin; Kang, Wei; Liu, X.; Zhang, L.Y.; Jin, Liwen; Zhang, Q.L.

doi:10.1016/j.apenergy.2016.02.043

Cited by 55 publications

(18 citation statements)

References 24 publications

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“…This is because when the outdoor temperature declines by 1°C, the following occur: (1) The ASHP’s coefficient of the performance (COP) would be reduced by about 2%–3%. 24,26 Therefore, the ASHP would be switched from an intermittent operation to continuous operation. (2) The heat dissipation variation is approximately linear to the outdoor temperature and much more heat would be transferred to the outdoor environment.…”

Section: Resultsmentioning

confidence: 99%

Thermal performance of a novel heating bed system integrated with a stack effect tunnel

Xin

Lei

et al. 2020

Indoor and Built Environment

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The traditional widely used Chinese Kang heating system has been gradually becoming obsolete, due to the coal or wood burning emission that causes poor indoor air quality. In the interest to preserve the rural life, this study evaluated the performance of a retrofitted traditional Kang heating system with the use of alternative clean energy in a rural-dwelling in Xi'an, China. An air source heat pump (ASHP) was applied to drive the heating bed system, and an indoor stack effect tunnel was incorporated to induce the stack effect and to enhance the heating efficiency. A series of experiments were carried out by varying the exhaust tunnel height and heating mode. The system was shown to have produced significant improvement of the indoor air temperature and satisfied the Chinese standard, GB/T 50824–2013 for rural buildings. For the same mean outdoor temperature, when the stack effect tunnel height was extended from 1.0 m to 1.5 m, a 9.3% improvement in the heat release was obtained. When the heating mode changes from a single flue bottom surface heating to the combined flue bottom and vertical tunnel's lateral surface heating, the enhancement was 43.9%. The system would provide a sustainable way to renovate, upgrade and preserve the traditional Kang system with a use of a cleaner energy source.

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Section: Resultsmentioning

confidence: 99%

Thermal performance of a novel heating bed system integrated with a stack effect tunnel

Xin

Lei

et al. 2020

Indoor and Built Environment

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“…Qin et al [122] studied the impacts of the size and shape of the porthole for the refrigerant injection in scroll compressors on the performance of the Air Source Heat Pump for Electric Vehicles. In order to use renewable energy, Zhao et al [123] proposed a solar phase change thermal storage (SPCTS) heating system in order to use low density and instable solar energy source for heating and improve the utilization efficiency of solar energy. Instead of solar energy, waste heat can also be used as the energy source.…”

Section: Energy Sciencesmentioning

confidence: 99%

Clean, efficient and affordable energy for a sustainable future

et al. 2017

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“…To ascertain the relation between the solar radiation utilization ratio and the supply heating temperatures, along with evaluating the efficiency of the radiant capillary module and the thermal comfort of the system for effective applications, Zhao et al [2] have done a set of experiments in a residential building in a province of China. As a conclusion, they have deduced that by reducing the supply water temperatures, energy consumption of the system may be noticeably get better, in case the supply water temperature is below 35 o C.…”

Section: Introductionmentioning

confidence: 99%

Determination of Convective, Radiative, and Total Heat Transfer Characteristics Over a Radiant Heated Ceiling: A Computational Approach

Açıkgöz¹

2019

Journal of Thermal Engineering

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In the present study, a computational investigation is carried out within a model room of which dimensions has also been given in international standards for experimental approaches. In accordance with the experimental standards, the analyses are realized at the room dimensions of (L x H x W= 4 x 3 x 4 m), and at the thermal boundary conditions of (Tc= 35-50 o C), (Tw= 15-24 o C), (Tf= 15-24 o C). As a result of iterations conducted using a computational fluid dynamics package program code, each corresponding to a case study, convective, radiative, and total heat fluxes from radiant heated ceiling are obtained, and afterward using relevant reference temperature proposed in the literature, heat transfer coefficients pertaining to convection, radiation, and total heat transfer have been found. In conclusion, average heat flux values of 95.83 Wm-2 and 17.49 Wm-2 are gained through the examined radiant heated ceiling, by means of radiation and convection, respectively. This denotes that roughly 85% of total heat transfer from the ceiling arises through radiation that is very compatible with the relevant literature. Finally, spanning the entire different case studies, average convective, radiative, and total heat transfer coefficients of 1.

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Experimental investigation and feasibility analysis on a capillary radiant heating system based on solar and air source heat pump dual heat source

Cited by 55 publications

References 24 publications

Thermal performance of a novel heating bed system integrated with a stack effect tunnel

Thermal performance of a novel heating bed system integrated with a stack effect tunnel

Clean, efficient and affordable energy for a sustainable future

Determination of Convective, Radiative, and Total Heat Transfer Characteristics Over a Radiant Heated Ceiling: A Computational Approach

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