A novel packaged outdoor air dehumidifier with exhaust air heat pump – Experiment and simulation

Cao, Xiang; Yang, Chen; Sun, Zhao; Lu, Yueming; Chang, Meng-Meng; Shao, Liang-Liang; Zhang, Chun‐Lu

doi:10.1016/j.applthermaleng.2020.115986

Cited by 20 publications

(5 citation statements)

References 28 publications

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“…The heat transfer properties of the condenser ( U c A c ) and the evaporator ( U e A e ) are set to 2.2 W/K and 0.73 W/K respectively with the effectiveness of the condenser and evaporator both of around 0.82 (Equations 8 and 9). The ratio of the flowrate of air cooling the condenser to the flowrate of air heating the evaporator is 3 [35] . The refrigerant is R410A [53] .…”

Section: Resultsmentioning

confidence: 99%

“…Thus, besides the exhaust air from the room, outdoor air is also introduced to cool the condenser. For example, Cao et al [35] recommended that the optimal ratio of the flowrate of the exhaust air to the total flowrate of air used to cool the condenser was between 0.35 and 0.40.…”

Section: Methodsmentioning

confidence: 99%

“…Compared with other energy-efficient methods for the outdoor air supply ( e.g. , cooling the outdoor air by the earth-air heat exchanger and recovering the cooling energy of the exhaust air by the flat plate heat exchanger), the EAHP has the advantages of no cross-contamination between the exhaust air and the outdoor air supply [34] , the capability of controlling the temperature and the relative humidity of the outdoor air supply [35] , and simple system configuration with low installation cost [36] . Moreover, the EAHP has good compatibilities with other energy-efficient methods, e.g.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Zhang

Yun

Lin

2022

Applied Thermal Engineering

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Zhang

Yun

Lin

2022

Applied Thermal Engineering

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“…[36] for the analysis of the airflow pattern in a modular fan unit and in Ref. [37] for a novel packaged outdoor air humidifier. A review of CFD-based applications for the design and optimization of heat exchangers instead is also presented in Ref.…”

Section: Review Of Compact Air-sourced Heat Pumps For Renovationmentioning

confidence: 99%

Compact Decentral Façade-Integrated Air-to-Air Heat Pumps for Serial Renovation of Multi-Apartment Buildings

et al. 2022

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To address the huge market of renovation of multi-apartment buildings, minimal-invasive decentral serial-renovation solutions are required. One major challenge in the design of decentral heat pumps is to find the optimal balance between, on one hand, compactness and pleasant design, and on the other hand, efficiency and minimal sound emissions. A comprehensive holistic design and optimization process for the development of decentral heat pumps, from the component level, to the system level, and up to the building level, is developed. A novel façade-integrated speed-controlled exhaust air to supply air heat pump combined with a mechanical ventilation system with heat recovery and recirculation air was developed and simulated in a reference flat. Compared to a traditional supply air heat pump without recirculation, it shows only slight performance improvement, but allows significantly better thermal comfort and control, independently from the hygienic air flow rate and from the heating and cooling loads. Detailed measurement and simulation results are presented for several functional models with heating power of around 1 kW up to 2.5 kW. The design was optimized by means of CFD simulations to allow for low pressure drop, homogeneous flow, and low sound emissions. Moreover, mock-ups of innovative façade-integrated heat pump outdoor units are presented.

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“…The ventilation methods encompass natural ventilation utilizing wind pressure differences by opening windows and doors, mechanical exhaust through forced air extraction via fans in kitchens and bathrooms, and a combination of natural and mechanical ventilation [29]. These methods are classified accordingly.…”

Section: Introductionmentioning

confidence: 99%

Ventilation Strategies for Mitigating Indoor Air Pollutants in High-Rise Residential Buildings: A Case Study in Dubai

Jung,

Abdelaziz Mahmoud

2023

Atmosphere

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This study investigates the effectiveness of different ventilation methods in reducing indoor air pollutants in newly constructed residential buildings, focusing on indoor air quality (IAQ) in Dubai. The paper highlights the growing concern for IAQ in response to residents’ increasing awareness of their well-being and environmental sustainability. The study examines the concentrations of formaldehyde (HCHO), volatile organic compounds (VOCs), and total volatile organic compounds (TVOC) in bedrooms and living rooms before and after implementing various ventilation methods during the construction phase. The findings indicate that mechanical exhaust ventilation, mainly through bathroom and kitchen exhaust fans, was highly effective in reducing HCHO levels. Combining kitchen and bathroom exhaust fans demonstrated the most significant reduction in HCHO concentrations. Similarly, reductions in VOCs, such as ethylbenzene, toluene, and xylene, were observed with different ventilation methods. Natural ventilation also proved effective in reducing pollutant concentrations. The results emphasize the importance of implementing appropriate ventilation strategies to improve IAQ in residential buildings. However, the study acknowledges the limitations of a single-location measurement and recommends further research to validate the findings across different building types and locations. Additionally, long-term studies are necessary to assess the sustained effects of ventilation methods on IAQ. The study highlights the significance of addressing IAQ concerns in residential buildings and suggests potential research directions to explore other ventilation strategies and their energy efficiency implications. Ultimately, this research contributes to developing healthier and sustainable living environments by promoting effective ventilation strategies to mitigate indoor air pollutants.

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A novel packaged outdoor air dehumidifier with exhaust air heat pump – Experiment and simulation

Cited by 20 publications

References 28 publications

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Compact Decentral Façade-Integrated Air-to-Air Heat Pumps for Serial Renovation of Multi-Apartment Buildings

Ventilation Strategies for Mitigating Indoor Air Pollutants in High-Rise Residential Buildings: A Case Study in Dubai

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