A Comprehensive Thermal Comfort Analysis of the Cooling Effect of the Stand Fan Using Questionnaires and a Thermal Manikin

Mun, Sun-Hye; Kwak, Young Hoon; Kim, Yeonjung; Huh, Jung-Ho

doi:10.3390/su11185091

Cited by 8 publications

(6 citation statements)

References 21 publications

(30 reference statements)

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“…Figure 6 shows the air velocity measured at the axis of air flow from the air circulator, as described in Figure 4. Although the air velocity gradually decreased, it was much higher than the typical air velocity (e.g., 0.2 m/s [14]) in the conditioned space. It was considered that the elevated air velocity at the CRCP surfaces promoted convective heat transfer between the panel surfaces and room air, which led to the increased cooling capacity and decreased room air temperature.…”

Section: Cooling Capacity Analysismentioning

confidence: 80%

“…This can contribute to the improvement of air diffusion and thermal uniformity. In addition, they reduce cooling energy consumption because the cooling set-point temperature can be decreased due to the elevated air velocity in an occupied space [12][13][14]. If an air circulator is configured to transport room air to CRCP surfaces, the enhancement of cooling capacity can be expected owing to the increased heat transfer rate at a panel surface.…”

Section: Introductionmentioning

confidence: 99%

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Cooling Capacity and Energy Performance of Open-Type Ceiling Radiant Cooling Panel System with Air Circulators

2020

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Ceiling radiant cooling panel (CRCP) systems are being increasingly applied to commercial buildings due to their high thermal comfort level and energy efficiency. It is recommended that CRCP systems should be operated at a relatively high chilled water temperature to prevent condensation and save energy. However, even though a high chilled water temperature is effective for achieving condensation-free operation and high chiller efficiency, it can lead to insufficient cooling capacity. In this study, a method of enhancing the cooling capacity of CRCP systems was investigated through mock-up chamber tests. The open-type installation of CRCPs and the combination of air circulators were used to enhance the cooling capacity and energy performance of CRCP systems. Experimental results showed that compared to a conventional CRCP system, the cooling capacity of an open-type CRCP system with air circulators increased by up to 26.2%, and its cooling energy consumption decreased by up to 26.4%. Additionally, the open-type CRCP system with air circulators reduced the difference between the room air temperature and mean chilled water temperature. Thus, the proposed system can operate at a relatively high chilled water temperature, which is effective for reducing condensation risk and cooling energy consumption.

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Section: Cooling Capacity Analysismentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Cooling Capacity and Energy Performance of Open-Type Ceiling Radiant Cooling Panel System with Air Circulators

2020

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“…There are many works on thermal comfort inside buildings [10,11]. Many authors focus in particular on the influence of the applied ventilation system and air velocity on the comfort of users [12,13].…”

Section: Figurementioning

confidence: 99%

Airflow Fluctuation from Linear Diffusers in an Office Building: The Thermal Comfort Analysis

et al. 2021

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In buildings, the HVAC systems are responsible for a major part of the energy consumption. Incorrect design or selection of the system and improper installation, operation, and maintenance of the systems’ elements may result in increased energy consumption. It is worth remembering that the main aim of the appropriate system is to maintain the high quality of the indoor environment. Appropriate selection of the HVAC solution ensures both thermal and quality parameters of the air, independently of the internal and external heat loads. The microclimate of a room is affected not only by air temperature, humidity, and purity, but also by air velocity in the occupied zone. The proper air velocity distribution prevents discomfort, particularly at workstations. Based on the measurements in the office building, an analysis of velocity profiles of air supplying two different types of linear diffusers was carried out. The analysis was made based on the results of measurements performed with thermoanemometers in the actual facility. During the study, temperature of the supply air was lower that the air in the room. Analysis was focused on the airflow fluctuation and its impact on the users’ comfort. This is an obvious topic but extremely rarely mentioned in publications related to air diffusers. The results show the importance of air fluctuation and its influence on the users’ comfort. During the measurements, the instantaneous air velocity for one of the analyzed types of the diffuser was up to 0.34 m/s, while the average value from the period of 240 s for the same measuring point was relatively low: it was 0.19 m/s. Only including the airflow variability over time allowed for choosing the type of diffuser, which ensures the comfort of users. The measurements carried out for two linear diffusers showed differences in the operation of these diffusers. The velocity in the occupied zone was much higher for one type (0.36 m/s, 3.00 m from diffusers) than for another one (0.22 m/s, 5.00 m from diffusers). The improper selection of the diffuser’s type and its location may increase the risk of the draft in the occupied zone.

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“…This is pertinent for the optimal occupational condition of a space. Thermal comfort analysis involves the manipulation of physical variables including air temperature, relative humidity, radiant temperature to favour consistent occupation of a defined space based on the occupant's metabolic and personal requirement [31]. Predicted mean vote (PMV) is an index of quantitative measure of thermal comfort of a particular person in a particular thermal environment.…”

Section: Thermal Comfort Analysismentioning

confidence: 99%

“…Shortly after Vesely et al [30] presented numerically, energy performance of personalized heating under different climates for medium sized office. Thermal response for the human body was studied by Zeiler et al [31] using fingertips as control sensor for personalized heating. Thermal effect of Nocolok flux was investigated on heat exchanger brazen joint by Milani et al [32].…”

Section: Introductionmentioning

confidence: 99%

Thermal comfort and energy utilization analysis of a personalised conditioned space

2020

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In this study, the analysis of thermal comfort and energy utilized by occupants in a personal conditioned space at Lagos State, Nigeria is examined. Since thermal comfort expresses the satisfaction of an occupant in a space, therefore it enhances or inhibits the productivity of occupants in an environment. The heat transfer through the conditioned space with optimal insulation using brick walls and insulation typical of a Nigerian building is formulated using the heat conduction and Navier-Stokes equation. While the comfortability of occupants in the space is determined using the predicted mean vote (PMV) and predicted percentage dissatisfied (PPD) indices. It is observed that occupants in the conditioned space are thermally comfortable when the ventilation rate is set to 8 l s −1 with non-insulated walls. With insulated wall, thermal comfortability of the space is set to 2 l s −1 adopting insulated wall thickness of 0.045 m. Energy cost using on grid power for non-insulated wall cost N4, 016.996 and N1, 015.512 for insulated walls annually. Utilizing off grid power source (diesel powered generator set) annual energy cost is determined as N2, 137.97 using thermal insulation and N8, 527.85 without insulation. It is observed that personalized cooling helps to achieve increased comfort of occupants in a conditioned space, also maximizing energy utilized. Consequently reducing energy wastage. Nomenclature 1 No personalized cooling and no insulation on wall 2 No personalized cooling but with wall insulation 3 Personalized cooling at airflow 1 l s −1 and no wall insulation 4 Personalized cooling at airflow 2 l s −1 and no wall insulation 5 Personalized cooling at airflow 4 l s −1 and no wall insulation 6 Personalized cooling at airflow 6 l s −1 and no wall insulation 7 Personalized cooling at airflow 8 l s −1 a −1 nd −1 no wall insulation 8 Personalialow 1 l s −1 with wall insulation 9 Personalized cooling at airflow 2 l s −1 with wall insulation 10 Personalized cooling at airflow 4 l s −1 with wall insulation 11 Personalized cooling at airflow 6 l s −1 with wall insulation 12 Personalized cooling at airflow 8 l s −1 with wall insulationT a Air temperature (°C)T mr Mean radiant temperature (°C) V arRelative air velocity with respect to human body (m s −1 ) RECEIVED

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A Comprehensive Thermal Comfort Analysis of the Cooling Effect of the Stand Fan Using Questionnaires and a Thermal Manikin

Cited by 8 publications

References 21 publications

Cooling Capacity and Energy Performance of Open-Type Ceiling Radiant Cooling Panel System with Air Circulators

Cooling Capacity and Energy Performance of Open-Type Ceiling Radiant Cooling Panel System with Air Circulators

Airflow Fluctuation from Linear Diffusers in an Office Building: The Thermal Comfort Analysis

Thermal comfort and energy utilization analysis of a personalised conditioned space

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