Study on energy-saving operation of a combined heating system of solar hot water and air source heat pump

Long, Jianyou; Xia, Kuiming; Zhong, Huihui; Lu, Haolin; Yongga, A

doi:10.1016/j.enconman.2020.113624

Cited by 59 publications

(12 citation statements)

References 30 publications

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“…To meet the goal of the net-zero emissions of greenhouse gases by 2050, the domestic heating must be decarbonised [2]. To compensate the intermittency of solar energy availability, solar thermal energy [3] can be integrated with heating technologies [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of operation performance of three indirect expansion solar assisted air source heat pumps for domestic heating

Yang

et al. 2022

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

Analysis of operation performance of three indirect expansion solar assisted air source heat pumps for domestic heating

Yang

et al. 2022

Energy Conversion and Management

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“…When assisted by other heat sources, the operating energy efficiency of the heat-source tower could be improved [26]. The combined system of HTHP and solar water will also improve the system's utilization efficiency of renewable energy [27]. However, there are only a few studies on the combined heating technology of a heat-source tower and solar energy.…”

Section: Introductionmentioning

confidence: 99%

Simulation Research on the Heating Performance of the Combined System of Solar Energy and Heat-Source Tower Heat Pump in a Hot Summer and Cold Winter Area

Shen

Yongga

2021

Energies

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Three connection methods for the combined heating systems of a closed-type heat-source tower heat pump (CHTHP) and solar collector (SC) were proposed in this paper: the heat-source tower (HST) and solar collector were connected in series (HST+SC), and the solar collector and heat pump (HP) condenser were connected in series (SC+HP) and in parallel (SC//HP). The calculation module of the closed heat-source tower was built using programming software based on C++ language, and three corresponding calculation models of the combined heating systems were established in the TRNSYS. Under the climatic conditions of the cold season in Changsha, the combined heating performance of the three systems was simulated and analyzed. The results indicate that the simulation results of the established models are in good agreement with the test results, and the simulation results can be used for the research of the system’s combined heating performance. When the outdoor air temperature and solar radiation intensity are low, the HST+SC system has the best heating performance; however, when the solar radiation intensity and ambient temperature are high, the heating performance of the SC//HP system is the best. When the solar radiation intensity and outdoor air temperature are between the previous two working conditions, the SC+HP system is the best performer for heating among the three systems. On the basis of the collector area and heat pump power designed in this study, the best operating condition interval diagrams of the three combined heating systems are established.

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“…It can be seen that the absorption heat pump plays a connecting role in the whole system, and is one of the core equipment of the system 17 . There are three main driving modes of absorption heat pump: high‐temperature flue gas, 18 steam 19 and hot water, 20 the gas‐driven mode is generally used in gas boiler. As shown in Table 1, compared with steam drive, hot water drive mode has the following defects: (a) The heat pump driven by hot water can only raise the temperature of the return water by about 8°C, this part of water cannot be directly sent to the heat supply network, but this part of water directly goes into the boiler for heating will reduce the output of the boiler.…”

Section: Introductionmentioning

confidence: 99%

Development of integrated technology for waste heat recovery from humid flue gas of hot water boiler

Cui

Gao

2021

Int J Energy Res

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Summary For coal‐fired hot water boilers, we developed a comprehensive waste heat recovery system coupled with a packed tower, industrial steam turbine, and absorption heat pump, which can directly reduce the auxiliary power consumption, realize energy cascade utilization, and waste heat recovery. The ASPEN Plus software was used to simulate the packed tower, absorption heat pump, and industrial steam turbine system. The design parameters of the system were obtained and the operation characteristics of the system under load rates of 25%, 50%, 75%, and 100% were investigated, the feasibility of steam subsystem transformation was also analyzed. Taking a 140 MW coal‐fired boiler as an example, in the range of 25%~100% load rate, the direct energy saving can reach 118 to 523 kW∙h, the waste heat recovery power is 2.7 to 11.4 MW, and the coal saving can reach 374 to 1605 kg/h, resulting in energy and resource consumption reduction effect, the system also has CO2 and pollutant emission reduction effect. The RadFrac model can be used in packed tower design, the system can work well under variable load conditions.

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Study on energy-saving operation of a combined heating system of solar hot water and air source heat pump

Cited by 59 publications

References 30 publications

Analysis of operation performance of three indirect expansion solar assisted air source heat pumps for domestic heating

Analysis of operation performance of three indirect expansion solar assisted air source heat pumps for domestic heating

Simulation Research on the Heating Performance of the Combined System of Solar Energy and Heat-Source Tower Heat Pump in a Hot Summer and Cold Winter Area

Development of integrated technology for waste heat recovery from humid flue gas of hot water boiler

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