Performance of a single-stage recuperative high-temperature air source heat pump

Sun, Shoujun; Guo, Heng; Lu, Ding; Bai, Yin; Gong, Maoqiong

doi:10.1016/j.applthermaleng.2021.116969

Cited by 29 publications

(5 citation statements)

References 30 publications

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“…Further, a heat pump-based solution is assumed to provide the thermal energy at a supply temperature around 100 o C, typical of the regeneration operating temperature of recently reported DAC processes based on temperature swing [28]. At such temperature levels, a Coefficient of Performance (COP) of 2.5 is within the range achievable by heat pumps for industrial heating [29,30]. These considerations allow us to estimate the total electrical energy required for preparing the feed gas to the reactor at the specified CO 2 concentration, described below.…”

Section: Energy Consumption For Co 2 Enrichmentmentioning

confidence: 99%

Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal

Lü

Pullin

Bullock

et al. 2022

Chemical Engineering Journal

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Section: Energy Consumption For Co 2 Enrichmentmentioning

confidence: 99%

Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal

Lü

Pullin

Bullock

et al. 2022

Chemical Engineering Journal

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“…[2][3][4] The widely used air-source heat pump is a viable and promising solution for reducing carbon footprints globally. [5][6][7] However, when an air-source heat pump runs under low temperature working conditions in winter in cold places, a few problems arise, such as a reduced coefficient of performance (COP), an extremely high discharge temperature, and insufficient heating capacity. Furthermore, a shutdown even maybe happen due to high discharge temperature of the compressor.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of liquid, vapor, and liquid–vapor injection of single-screw compressor for an air-source heat pump

Wen,

Zhi,

et al. 2024

AIP Advances

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Refrigerant injection techniques are usually proposed to improve the performance and reliability of compressors when a single-screw compressor applied to an air-source heat pump works at low temperatures in winter. In this study, an experimental study was conducted to present the performance comparison of the single-screw compressor in the air-source heat pump under liquid, vapor, and liquid–vapor refrigerant injection at evaporation temperatures between −19 and −8 °C. The results indicate that, when the evaporation temperature decreases from −8 to −19 °C, the heating capacity under liquid–vapor and vapor injection increases by 16.7% and 12.7%, respectively, compared with that under liquid injection and that the COPh increment under liquid–vapor injection and vapor injection is, respectively, from 11.23% to 39.21% and from 17.18% to 30.82% compared with that under liquid injection. Therefore, the liquid–vapor injection method is conducive to the operation of the air-source heat pump at a lower ambient temperature. The experimental results can provide the basis for the future design of single-screw compressors applied to air-source heat pumps.

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“…In this context, heat pumps have been recognized as an efficient and clean technology for heat and cold supplies . It was established that “Heat pumping technologies are a mature, widely deployed, and cost-effective energy efficiency option, with a significant role to play in portfolios of measures to address key energy policy concerns”…”

Section: Introductionmentioning

confidence: 99%

“…4 In this context, heat pumps have been recognized as an efficient and clean technology for heat and cold supplies. 5 It was established that "Heat pumping technologies are a mature, widely deployed, and cost-effective energy efficiency option, with a significant role to play in portfolios of measures to address key energy policy concerns". 6 Among this technology, renewable heat pumps use the lowgrade heat of air, water, or soil to produce heat at a higher temperature, only consuming electricity.…”

Section: Introductionmentioning

confidence: 99%

Innovative Process Integrating Air Source Heat Pumps and Direct Air Capture Processes

Leonzio

Shah

2022

Ind. Eng. Chem. Res.

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Most integrated assessment models indicate a need for technological carbon dioxide removal from the atmosphere to achieve climate mitigation targets. Currently, direct air capture (DAC) appears to be one the “backstop” technologies suitable to provide this service. These technologies usually require low-carbon heat as part of their operation cycle. Here, we consider a way of providing this heat when no local heat source is available. Air source heat pump (ASHP) water heaters are a well-known technology that takes heat from the air to supply hot water. Variations on their operating conditions could provide water at 100 °C, when a trans-critical cycle is used. This level of temperature is required by several DAC adsorption processes as the thermal energy for the regeneration stage. For this reason, an innovative process integrating an ASHP and a DAC adsorption system is proposed here. The heat pump provides not only heating but also cooling, while three separate stages (adsorption, cooling, and regeneration) are considered for the DAC. In the integrated process, the air is sent to the adsorbent bed at first and after that to the evaporator of the heat pump and then used for the cooling stage. The hot water supplied by the heat pump is used for the desorption. Different working fluids (CO2, CO2-ethane, CO2-R41), with low ozone depletion and global warming potentials, are investigated. The results show that a high level of efficiency is possible for heat pumps supplying hot water at 100 °C. Moreover, energetic advantages are present with reference to the base case, where heat is provided by a municipal water incinerator and cooling by a cooling tower. Savings in the energy consumption of 55, 60, and 53% for the integrated process using CO2, CO2/R41, and CO2/ethane, respectively, are possible. Economic benefits are present when economic incentives are provided, ensuring lower costs up to 39 $/tonCO2, and the technology benefits from location flexibility as only a power supply (and not a heat source) is required.

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Performance of a single-stage recuperative high-temperature air source heat pump

Cited by 29 publications

References 30 publications

Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal

Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal

Performance comparison of liquid, vapor, and liquid–vapor injection of single-screw compressor for an air-source heat pump

Innovative Process Integrating Air Source Heat Pumps and Direct Air Capture Processes

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