Performance comparison of a heating tower heat pump and an air-source heat pump: A comprehensive modeling and simulation study

Huang, Shifang; Zuo, Wangda; Lu, Huixia; Liang, Caihua; Zhang, Xiaosong

doi:10.1016/j.enconman.2018.11.050

Cited by 63 publications

(23 citation statements)

References 19 publications

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“…At the same time, the risk of Legionella can be eliminated via supplementary heating or point of use heating (Lund et al, 2014;Lee, 2018). By reviewing literature regarding the low-temperature heating concept, supply temperatures of 40 and 11-12 • C are selected for heating and cooling, respectively (Nordman et al, 2012;Huang et al, 2019).…”

Section: Hp Systemmentioning

confidence: 99%

Novel Energy System Design Workflow for Zero-Carbon Energy District Development

Samadzadegan¹,

Abolhassani²,

Dabirian³

et al. 2021

Front. Sustain. Cities

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The growing urban population globally leads to higher greenhouse gas (GHG) emissions and stress on the electricity networks for meeting the increasing demand. In the early urban design stages, the optimization of the urban morphology and building physics characteristics can reduce energy demand. Local generation using renewable energy resources is also a viable option to reduce emissions and improve grid reliability. Notwithstanding, energy simulation and environmental impact assessment of urban building design strategies are usually not done until the execution planning stage. To address this research gap, a novel framework for designing energy systems for zero-carbon districts is developed. An urban building energy model is integrated with an urban energy system model in this framework. Dynamic prediction of heating and cooling demand and automatic sizing of different energy system configurations based on the calculated demands are the framework's primary capabilities. The workability of the framework has been tested on a case study for an urban area in Montreal to design and compare two different renewable energy systems comprising photovoltaic panels (PV), air-source, and ground source heat pumps. The case study results show that the urban building energy model could successfully predict the heating and cooling demands in multiple spatiotemporal resolutions, while the urban energy system model provides system solutions for achieving a zero-carbon or positive energy district.

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Section: Hp Systemmentioning

confidence: 99%

Novel Energy System Design Workflow for Zero-Carbon Energy District Development

Samadzadegan¹,

Abolhassani²,

Dabirian³

et al. 2021

Front. Sustain. Cities

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“…They not only provide ecological solutions for heat generation, but also increase energy independence [6]. However, there are still some shortcomings limiting the further development of solar thermal utilization technology and ASHP technology, such as the intermittence and low energy density of solar energy [7] and the phenomenon that the evaporator of the ASHP may be frosted in a low temperature environment, which leads to a decrease in heating capacity and Coefficient of Performance (COP) [8]. For the purpose of effectively solving the frosting problem in ASHP applications, the heat-source tower technology was put forward [9].…”

Section: Introductionmentioning

confidence: 99%

“…Liang et al [12] constructed an open-type heat-source tower heat pump (OHTHP) test device and discovered that the system has a good heating effect and almost completely avoided the ASHP frosting problem. Huang et al [8] used a numerical method to compare and analyze the performance of OHTHP and traditional ASHP, and discovered that compared with traditional ASHP, the efficiency of OHTHP in summer and winter increased by 23.1% and 7.4%, respectively. Lu et al [13] established the prediction correlation of heat and mass transfer of an open-type heat-source tower by theoretical analysis and a numerical method.…”

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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“…Huang et al (2019a) carried out a large-scale comprehensive performance evaluation of the HTHPs in 869 typical locations in the warm, mixed and cool climate zones over the world; the results show that the HTHPs have excellent performance in the warm and mixed climate zones and also applicable in the cool climate zone. To investigate the performance improvements of the HTHP over the air-source heat pump, a comprehensive comparison between the two systems was carried out based on a simulation study by Huang et al (2019b); it was found that the HTHP achieves an increase of 7.4% in efficiency that air-source heat pump in winter.…”

Section: Introductionmentioning

confidence: 99%

Effects of the operation parameters of a closed-type heating tower on the performance of heating tower heat pump system

Feng

Zhao

et al. 2020

Energy Exploration & Exploitation

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The ventilator of the heating tower and the circulating pump of the anti-freeze solution are the main electrical equipment of a heating tower heat pump system, besides the compressor. By controlling the working frequencies of the ventilator of the heating tower and circulating pump of the anti-freeze solution, the effects of the operation parameters of a closed-type heating tower on its heat absorption and the performance of heating tower heat pump system were investigated under winter heat conditions. The results indicated that reducing the frequency of the circulating pump for the anti-freeze solution leads to a decrease in the temperature of the outlet evaporator of the anti-freezing solution and an increased temperature difference between the anti-freeze solution flowing into and out of the heating tower; meanwhile, excessively high and low anti-freeze flow rates lead to reduced heat absorption of the closed-type heating tower. The coefficient of performance fluctuates slightly if the frequency of circulating pump is above 20 Hz, but a slight drop in coefficient of performance is observed when the frequency is less than 15 Hz. The system energy efficiency ratio tends to increase as the frequency of circulating pump is reduced, although a substantial reduction occurs at 10 Hz. Furthermore, a reduced ventilator frequency decreases the temperatures of the anti-freeze solution at the inlet and outlet of the heating tower and the temperature difference, hindering the heat absorption of the heating tower. With reductions in the ventilator frequency, the coefficient of performance exhibits an initial increase followed by subsequent decreases, while the system energy efficiency ratio showed continual increases until the ventilator frequency dropped to 10 Hz. When the ventilator frequency or circulating pump frequency drops to 15 Hz and 10 Hz, the evaporation temperature of the heat pump unit decreases, resulting in an excessively exhaust temperature, which is not favorable for the safe operation of the system.

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Performance comparison of a heating tower heat pump and an air-source heat pump: A comprehensive modeling and simulation study

Cited by 63 publications

References 19 publications

Novel Energy System Design Workflow for Zero-Carbon Energy District Development

Novel Energy System Design Workflow for Zero-Carbon Energy District Development

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

Effects of the operation parameters of a closed-type heating tower on the performance of heating tower heat pump system

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