Review of energy conservation technologies for fresh air supply in zero energy buildings

Liu, Zhongbing; Li, Weijiao; Chen, Yazhen; Luo, Yongqiang; Zhang, Ling

doi:10.1016/j.applthermaleng.2018.11.085

Cited by 129 publications

(50 citation statements)

References 95 publications

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“…31 Further studies are needed to confirm the possible benefits of reduced CO 2 level in the naturally ventilated room accompanying with the use of fans. 32…”

Section: Discussionmentioning

confidence: 99%

Elevated airflow can maintain sleep quality and thermal comfort of the elderly in a hot environment

et al. 2019

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The effect of elevated airflow on sleep quality was investigated with 18 elderly. Three airflow conditions were set: ceiling fan/30°C/max.0.8 m/s and mean 0.7 m/s, task fan/30°C/max.0.8 m/s and mean 0.6 m/s, and thermally neutral /27°C/0.2 m/s. Sleep quality was evaluated objectively by analysis of electroencephalogram signals that were continuously monitored during the sleeping period. Urinary cortisol concentrations were analyzed to measure the activity of sympathetic nervous system. No significant difference in sleep quality, thermal comfort, or cortisol concentration was found between the ceiling fan and the neutral condition. The duration of total sleep time decreased by 35 minutes, the duration of REM sleep decreased by 15 minutes, and the cortisol concentration in the morning increased by 50 ng/mL in the task fan than the other two conditions. Compared with ceiling fan, less heat load was removed in the task fan condition, possibly due to the lower air speed. This study shows that even small heat load led to reduced sleep quality and overactive sympathetic nervous system of the elderly. By supplying an airflow of 0.8 m/s evenly over the human body, the elderly could maintain sleep quality and thermal comfort at an air temperature that was 3 K higher than the neutral temperature.

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“…31 Further studies are needed to confirm the possible benefits of reduced CO 2 level in the naturally ventilated room accompanying with the use of fans. 32…”

Section: Discussionmentioning

confidence: 99%

Elevated airflow can maintain sleep quality and thermal comfort of the elderly in a hot environment

et al. 2019

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“…Reducing energy use through more energy-efficient measures has become a common concern for researchers [4] . Fresh air supply in buildings is of great benefit to indoor air qualities and peoples' health, and has become a concern due to the sick building syndrome (SBS) and the outbreak of the severe acute respiratory syndrome (SARS) in 2003 [5] . Due to the large temperature or enthalpy difference between the outdoor fresh air and the indoor air, the handling of fresh air requires a large amount of building energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and performance analysis of solar-driven exhaust air thermoelectric heat pump recovery system

Liu

Zhang

et al. 2019

Energy and Buildings

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a b s t r a c tExhaust air heat recovery is of great significance for building energy conservation. Since passive heat recovery systems use temperature or enthalpy difference between outdoor air and indoor air to drive the system, the temperature of fresh air supply cannot meet indoor requirements and the exhaust heat is not fully recovered. In this study, a solar-driven exhaust air thermoelectric heat pump recovery (SDEATHP) system is tested and evaluated for its ability to recover thermal energy from exhaust air to cool or heat fresh air. An experimental platform was established to test its performance. Results show that the SDEATHP system can obtain higher fresh air supply temperature in winter and lower fresh air supply temperature in summer. The system requires only 3.12 W of power for the fans, and the average relative cooling coefficient in summer and the average relative heating coefficient can reach 50.6 and 57.9, respectively. The optimal operating current and voltage of TE modules and photovoltaic system is analyzed, and then the number and types of electrical connections for the TE modules in SDEATHP system are discussed. The SDEATHP system provides a new method for building energy recovery and fresh air supply.

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“…The building sector is one of the most energy-consuming sectors, which is responsible for about the 30% to 40% of the overall energy consumption in every country. 1,2 Trigeneration systems are a sustainable choice for producing heating, cooling, and electricity for the building sector. 3,4 Solar energy is a renewable and abundant energy source, which is usually used for driving trigeneration or generally polygeneration energy systems.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis and yearly performance of a trigeneration system driven by solar‐dish collectors

et al. 2019

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Summary Solar‐driven polygeneration systems are promising technologies for covering many energy demands with a renewable and sustainable way. The objective of the present work is the investigation of a trigeneration system, which is driven by solar‐dish collectors. The examined trigeneration system includes an organic Rankine cycle (ORC), which operates with toluene, and an absorption heat pump, which operates with LiBr/H2O. The absorption heat pump is fed with heat by the condenser of the ORC, which operates at medium temperature levels (120°C to 150°C). The absorption heat pump produces both useful heat at 55°C and cooling at 12°C. The ORC produces electricity, and it is fed by the solar dishes. The examined ORC is a regenerative cycle with superheating. The total analysis is performed with a developed model in Engineering Equation Solver (EES). The system is investigated parametrically for different ORC heat‐rejection temperatures, different superheating levels in the turbine inlet, and various solar‐beam irradiation levels. Furthermore, the system is investigated on a yearly basis for the climate conditions of Athens (Greece) and for Belgrade (Serbia). It is found that the yearly system energy and exergy efficiencies are 108.39% and 20.92%, respectively, for Athens, while 111.38% and 21.50%, respectively, for Belgrade. The values over 100% for the energy efficiency are explained by the existence of a heat pump in the examined configuration. For both locations, the payback period is found close to 10 years and the internal rate of return close to 10%. The final results indicate that the examined configuration is a highly efficient and viable system, which operates only with a renewable energy source.

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Review of energy conservation technologies for fresh air supply in zero energy buildings

Cited by 129 publications

References 95 publications

Elevated airflow can maintain sleep quality and thermal comfort of the elderly in a hot environment

Elevated airflow can maintain sleep quality and thermal comfort of the elderly in a hot environment

Experimental study and performance analysis of solar-driven exhaust air thermoelectric heat pump recovery system

Parametric analysis and yearly performance of a trigeneration system driven by solar‐dish collectors

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