###### Abstract  
A Chinese commercial kitchen fume exhaust (CCKEF) system mainly consists of a wall-mounted canopy hood, air duct and terminal electrostatic purifiers, the capture and purification performance of which should be guaranteed to obtain satisfactory indoor and outdoor air environment in engineering applications. However, few studies have focused on the operation performance of CCKEF systems. This study was aimed at providing a simulation method to investigate the operation performance of such systems. The simulation model of a representative CCKEF system was established using CFD software and validated with measured temperature, air velocity and purification efficiency with a deviation within 10%. The validated model was used to predict the indoor air environment and purification efficiency of the CCKEF system under different working conditions. The results showed that the temperature of transfer air from adjacent rooms had a greater impact on the thermal environment of the cooking area than the surface temperature of stoves. The exhaust air volume had a significant influence on both the indoor air environment and purification efficiency. CCKEF system was suggested to be operated at the optimum airflow according to the simultaneous coefficient of stoves as the energy consumption of the system can be saved by 3.75%. Chinese commercial kitchen; exhaust fume system; capture and purification performance; simulation study +
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[PERSON] et al. [17] investigated factors that affect the function of the air curtain range hood, such as the exhaust rate, air curtain velocity, slot width and angle. The results showed that the exhaust rate was the main factor affecting the performance of the air curtain range hood. [PERSON] and [PERSON] [18] carried out a numerical investigation of the temperature distribution and exhaust gas motion under different natural make-up air conditions and showed that the ventilation condition of windows and doors has a direct impact on temperature distribution and particle motion. [PERSON] et al. [19] and [PERSON] et al. [20] investigated the effect of disturbing the airflow caused by humans walking on the performance of a range hood in a residential kitchen. They found that the capture efficiency had a decrement of 0.5 under the most unfavorable conditions, and an air curtain could prevent the effect induced by humans walking with a smaller increment in air volume. With regard to the purification of cooking fumes, the technologies used in the catering industry in China currently include mechanical separation, filtration, washing and absorption and electrostatic deposition [21]. The electrostatic deposition is the most common technology, with the proportion of terminal two-stage electrostatic purifiers used to purify cooking fume in Chinese commercial kitchens as high as 98.04% [22]. The influence of structural (diameter, spacing and quantity of corona wire) and operating (applied voltage and airflow velocity) parameters on the performance of a two-stage electrostatic precipitator were widely investigated. [PERSON] et al. [23] studied the effects of geometric size, voltage parameters and working conditions on the dust-removal performance of a two-stage electrostatic precipitator. The results showed that for particles with large size, the dust removal performance was proportional to the particle diameter and inversely proportional to the inlet wind speed. [PERSON] et al. [24] studied the effects of various parameters on the collecting efficiency of a two-stage electrostatic module for oil mist particles and found that the degree of influence from high to low was as follows: the voltage applied to the precharger, the heteropolar distance of the precharger, the velocity, the heteropolar distance of the collector, the voltage applied to the collector, the length of the collector plate and the length of the precharger grounding plate. [PERSON] et al. [25] investigated the factors influencing the removal of PM\({}_{2.5}\) in a two-stage electrostatic precipitator.