Abstract
From the point of view to reduce energy consumption, door open while air conditioner running on buildings have a problem. To solve the problem, many facilities for entrance with vestibule, revolving door, and air curtain are utilized. Among the facilities, the air curtain cuts off the indoor and outdoor air by discharging the wide air surrounding the opening, thereby preventing the heat loss from the indoor. The purpose of this study is to evaluate the heat blocking efficiency of non-recirculating air curtain and to evaluate its optimal discharge velocity. To achieve this goal, the infiltration rate across the single-side opening were investigated with air temperature differences between areas by transient CFD simulation and the results were compared with the steady-state calculation method. In addition, to evaluate the heat blocking efficiency of non-recirculating air curtain, the calculation model was set up and several cases with discharge velocity were compared. The results show that the discharged air from the air curtain causes a deflection from the high temperature area to the low temperature area, and the deflection decreases with increasing the discharge air velocity. In this study, the safety factor for deflection modulus of the non-recirculating air curtain was calculated 2.75.
Highlights
While air conditioner is running, leaving doors and windows open is a great way to reduce operating efficiency and undermine the air conditioning system's ability to bring the indoor to a comfortable temperature
The numerical error of the infiltration rate was consistent within 10% at 100 seconds by comparing with the theoretical value of the steady-state method and the transient CFD simulation result
The infiltration rate has a high value before reaching the steady state of indoor air distribution, it was kept a value similar when the air distribution reaches the steady state with the theoretical value by Pham and Oliver [9]
Summary
While air conditioner is running, leaving doors and windows open is a great way to reduce operating efficiency and undermine the air conditioning system's ability to bring the indoor to a comfortable temperature. In commercial stores on the sidewalks, the door open while air conditioner running causes a problem against the global trend toward an energy-saving society. Several countries have established policies to impose fines on commercial store with the door open while air conditioner running. New York in the United States is a law [1] passed in 2015 to keep store and restaurant doors closed when their air conditioning is on. South Korea has imposed penalties of up to $3,000 for violators on commercial store, shops, and shopping malls through a crackdown since 2012
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