Ventilation Jet Research Articles

Cross transmission of normal breathing-released contaminants in a general hospital ward with impinging jet supply: A numerical study

Impinging jet ventilation (IJV) system is promising to improve air quality in hospital wards compared with traditional mixing systems, while previously studied IJV systems for hospital wards were, in fact, personalized ventilation systems. This study investigates the cross-transmission of contaminants in a 4-bed hospital ward ventilated by one diffuser, including the impacts of occupants’ posture and mask, and to suggest low-risk positions for healthcare workers. A numerical model is established and validated to simulate the airflow and contaminant distribution in the enclosure. The results include: a) the supply velocity of 1.3 m/s and temperature of 18 °C maintains an overall thermoneutral environment; b) the supply diffuser creates an overall recirculated airflow though the ambient air velocity in most regions (93.8 % of the ward space) is lower than 0.1 m/s; c) the root mean square of velocity along the height is 0.003 m/s between lying and sitting conditions, and the root mean square of temperature is 0.16 °C, indicating the impacts of posture on velocity and temperature fields are ignorable; d) the transfer of lying patient-released contaminants is dominated by the recirculated airflow, while in the sitting cases, it is dominated by thermal plumes; e) healthcare workers are advised to position themselves opposite the supply diffuser for lying patients, and alongside the walls for sitting patients to reduce infection risk; f) exhaled contaminants flows upward straightly when masks are functioning well. These outputs indicate that the work position of healthcare workers should be adjusted according to patients’ posture.

К особенностям проветривания урановых рудников

The systems of ventilation of radioactive deposits require special measures to minimize the impact of radon on miners. During the production of uranium ores, the working conditions of miners are determined by the content of metal in the broken ore, the intensity of radon emission, and the ventilation quality; therefore, the issues of mine atmosphere quality management become the top of the agenda. The patterns of gas interaction are found by modeling, with the determination of values of leaks through the exhaust space. The depth of regulation of air supply to the shaft bottom is determined as a function of regulation on the outgoing jet, the regime of airflow through the exhaust space, and the leak coefficient. A model of airflow in the direction of the shaft bottom has been compiled with the variables of the movement of ventilation jets. The pattern of airflow movement depending on the amount of air and the dimensions of the collapse area has been obtained. The mechanism to reduce contamination by using gas drainage through the collapsed wall has been identified. The recommendation on airing the mine workings with turbulent jets at a turbulent, laminar, and transient regime has been provided. A method to manage the atmosphere in the mine by adjusting the regime of leak movement through the mine working spaces has been recommended. The possibility of providing a mine with the required air by rationalizing the aerodynamic connection of mining operations with the surface has been substantiated. A practical issue of the airing of a section of an operating mine has been resolved as an example. It has been demonstrated that the substantiation of the possible use of isolated ventilation workings to release the contaminated air ensures cost savings due to the dismissal of a part of ventilation mine workings while ensuring the safety of miners. It has been proved that the possibilities of the injection method of ventilation increase when using an auxiliary drainage system.

Experimental study on forced ventilation in dead-end mine working with various setbacks of the ventilation pipeline from the working face

The study of airflow patterns at the ends of dead-end mine workings is crucial for optimizing underground mining ventilation systems. Understanding these patterns forms the basis for designing and implementing effective ventilation strategies.Previous studies have shed light on the behavior of the main vortex and the formation of stagnant zones in such environments, but these insights remain fragmented and call for a more systematic exploration to integrate them into a comprehensive theory.This paper presents the results of a thorough field investigation into the forced ventilation behavior in a dead-end mine working with a significant cross-sectional area (29.2 m2). We evaluated the impact of varying the setback distance of the ventilation duct’s end from the working face at intervals of 10, 15, 17, 19, and 21 m. The experimental design included precise measurements of turbulent airflow velocities at 25 carefully chosen points (in a 5x5 grid) for each setback distance, covering the area from the working face to beyond the end of the ventilation duct. This included additional measurements taken 1 meter and 10 meters past the termination of the ventilation duct, moving towards the entrance of the working area.The fieldwork was carried out in a typical dead-end stope at the Kupol gold-silver mine in the Chukotka Autonomous District, created by drilling and blasting.The volume of fresh air delivered to the working was maintained at a consistent rate of 17.4 m3/s across all scenarios, aligning with the mine’s standard air flow rate derived from the ventilation requirement for exhaust gases emitted by internal combustion engines of Load-Haul-Dump (LHD) machinery. With the duct’s terminal cross-sectional area at 0.8 m², this resulted in an inflow velocity averaging 21.75 m/s.Additionally, we included insights from three-dimensional numerical simulations performed in ANSYS Fluent, focusing on steady-state air movement and developed turbulence within the dead-end space. A comparative review of both empirical and modeled data shows that the ventilation jet, for all tested setback distances up to 21 m, successfully delivered air to the working face, where it then dispersed and initiated reverse flow patterns.These experiments led to the formulation of a linear relationship between the maximum relative velocity (compared to the initial jet velocity) at a distance of 1 m from the working face and a key geometric factor of the ventilation setup. This factor is the ratio of the duct’s setback distance to a characteristic dimension of the cross-sectional area, calculated as the square root of the cross-sectional area.

A simple method and prediction model for calculating the cooling load of impinging jet ventilation system in office buildings

An appropriate thermal stratification environment can be formed in impinging jet ventilation (IJV) cooling rooms. In this scenario, the well-mixing hypothesis provided by the conventional mixing ventilation is not applicable to calculate the cooling load of IJV systems. In the present study, a simple method using the cooling load ratio (CLR, α) is proposed for calculating the cooling load in the thermal stratification environment of IJV. Numerical simulations are applied to investigate the effect of several influencing factors on the CLR. Univariate analysis results indicate that the key influencing factors of α are the thermal length scale (Lm), supply airflow rate (L) and total heat gain (q*). A prediction model of α (CLR model) is developed related to the three influencing factors of Lm, L and q*. The CLR model has a high prediction accuracy in low q* situations (q* ≤ 2.5), with a slightly reduced accuracy in high q* situations. Overall, the maximum relative error of the CLR model is lower than 12%. Moreover, contour plots of α illustrate that α achieves a minimum level of 0.55, and the values of α vary between 0.55 and 1.0 for all the values of Lm, L and q*. The CLR model can provide a theoretical basis for the determination of cooling load and energy saving potential of IJV systems during the design stage.

Geometric-parameter influence and orthogonal evaluation on the thermal environment for an impinging jet ventilation system inlet

Numerical simulations are conducted to illustrate the geometric-parameter influences and orthogonal evaluation of heat removal effectiveness and dimensionless buoyant jet length scale for impinging jet ventilation system, after the full-scale measurements conduced. Two geometric parameters taken into consideration are the airflow inlet length, width and height from floor. Firstly, each geometric-parameter influence is investigated individually among its varying range while maintaining the other geometric parameters. Secondly, an orthogonal analysis is performed for evaluating the importance of each geometric-parameter on the thermal environment and thermal comfort performances.

Optimization and operation control for the combined impinging jet ventilation and chilled ceiling system with different cooling loads

The matching relationship of operating parameters between the air supply and radiant systems has significant impact on the indoor thermal comfort and energy efficiency for combined air-conditioning system. The impinging jet ventilation (IJV) and chilled ceiling (CC) combined system (IJV/CC) overcomes the drawback of IJV which cannot be used in spaces with high cooling load. However, the matching relationship between the operating parameters of the IJV and CC are not clear due to limited research on IJV/CC at present. To ensure good thermal comfort and indoor air quality of the IJV/CC in an energy efficient way, this study mainly focuses on exploring the optimal combination of the operating parameters between the IJV and CC (including the supply temperature and supply velocity of IJV and internal surface temperature of CC (Tc)). First, the indoor thermal environment for IJV/CC operating with different combinations of design parameters is simulated by CFD. Second, response surface methodology (RSM) is utilized to establish predictive models for various ventilation performance indicators by collecting the simulation results. Then, the optimal combinations of operating parameters between the IJV and CC are determined by using the technique of order preference by similarity to ideal solution (TOPSIS) coupled with the developed RSM models. Finally, control strategies for the IJV and CC are discussed and it suggests setting the value of Tc in the range of 20–21 °C and a variable air volume system is preferred for the control of the air supply system to achieve efficient operation of IJV/CC.

Energy saving, indoor thermal comfort and indoor air quality evaluation of an office environment using corner impinging jet ventilation

The performance of a corner based impinging jet ventilation system (CIJV) in an office environment was evaluated numerically. The evaluation was done both in terms of the local thermal comfort and the local indoor air quality. Three different inlet configurations were tested for a range of outdoor temperatures that included both winter and summer conditions. In terms of indoor air quality, the results showed that CIJV performed better than a traditional mixing system. The study also revealed that CIJV creates a stronger temperature stratification in summertime compared to wintertime. When evaluating the energy saving potential the results showed a possible reduction of 7% for the ventilation flowrate when the outdoor temperatures were between −15 °C and −5 °C, 8% when the outdoor temperatures were between 0 °C and 10 °C and 9% when the outdoor temperatures were between 15 °C and 25 °C.

Закономерности аэрогазодинамических процессов при подземных пожарах

The issue was studied related to increasing occupational safety in underground mining of the mineral raw materials. The forms of the goaf are classified. An algorithm was developed for air distribution in emergency ventilation mode, including when the main ventilation fan is turned on after an emergency stop. The possibilities and mechanism of the fan influence at the stages of ventilation in emergency conditions was clarified. An algorithm is proposed for calculating ventilation parameters in case of emergency reversion of the ventilation jet. The methods for calculating the amount of air and the inertia of the ventilation system are presented at normal ventilation and during the transition from normal ventilation to emergency. The problem of air distribution during the transition period is solved with the representation of the air branch in the form of a node with multidirectional and limited movement of air jets. The methodology for predicting hazardous working situations is detailed based on the laws of diffusion transfer of gas components of the mine atmosphere. A new method of experimental determination of elements of the transitional period of ventilation was developed. The results are given concerning the study of the influence of the goaf on the efficiency of the fans operation and the duration of the transition process after reversing the fan in an emergency. A new idea is substantiated related to the gas situation as a fragment of a ventilation network with distributed sources of oxygen absorption and gas release. The structure of the matrix of the state of mine workings in an emergency was proposed. An algorithm for calculating ventilation modes for optimizing emergency response plans is formulated. It is shown that the establishment of the regularity of the processes of gas transfer during emergency ventilation mode allows to increase the efficiency of measures to ensure occupational safety in underground mining.

Mitigation of breathing contaminants: Exhaust location optimization for indoor space with impinging jet ventilation supply

Densely occupied spaces (e.g., classrooms) are generally over-crowded and pose a high risk of cross-infection during the pandemic of COVID-19. Among various ventilation systems, impinging jet ventilation (IJV) system might be promising for such spaces. However, the exhaust location of the IJV system used for densely occupied classrooms is unclear. This study aims to investigate the effects of exhaust location on the removal of exhaled contaminants in a classroom (15 × 7 × 5 m3) occupied by 50 students. Exhaled contaminants are modeled by a tracer gas released at the top of each manikin. The reference case has three exhausts evenly distributed in the ceiling. The results indicate that: a) a recirculation airflow entraining exhaled contaminants exists above the occupied zone; b) this recirculation air flow entrains contaminants and accumulates them at the upper part of the room near the diffuser; c) locating merely one exhaust on the same side of the supply diffuser leads to the best indoor air quality, i.e., it reduces the mean age of air from 278 s to 243 s, the mass fraction of CO2 from 753 ppm to 726 ppm, and the concentration of tracer gas from 305 ppm to 266 ppm; d) this layout still performs the best when the supply velocity drops to 0.5 m/s. It is worth noting that the proposed layout has fewer exhausts than the reference case but performs better. These results conclude that the exhaust for large spaces is not evenly distributed but depends on the indoor airflow pattern: the key is locating the exhaust near the region with high contaminant concentration. Factors determining the recirculation airflow are suggested to be further studied.

Local heating of a visitor corridor within a large site museum exhibition hall via an integrated jet ventilation and air curtain system

Large exhibition halls of site museums typically accommodate cultural relics and visitors in the same open space. Generally, the visitor area occupies a small portion of the entire site, and the relic preservation area is surrounded by a visitor corridor. One of the main challenges at these sites is environmental control: meeting various thermal requirements, while reducing energy consumption and related expenses. In this study, we proposed an integrated system, consisting of a ground-based jet ventilation attachment and an air curtain, for local heating of a visitor corridor. An experimental exhibition hall and local heating system for the visitor corridor were constructed based on the spatial characteristics of Emperor Qin's Mausoleum Site Museum. A series of tests, based on changing the jet air velocity and switching the air curtain on and off, were conducted to evaluate the performance of the system. The results of these tests showed that the air curtain effectively reduced the impact of the large relic preservation area on the local environment of the visitor corridor, thereby achieving uniform heating in the visitor area using the jet ventilation system. Additionally, a jet air velocity of 1.5 m/s resulted in even heating throughout the visitor corridor and met the thermal comfort requirements of indoor spaces intended for short-term visitors and tours. Therefore, the proposed system provides an efficient and energy-saving strategy for local environmental control of visitor areas in large on-site exhibition halls.

Transmission mitigation of COVID-19: Exhaled contaminants removal and energy saving in densely occupied space by impinging jet ventilation

The pandemic of COVID-19 and its transmission ability raise much attention to ventilation design as indoor-transmission outstrips outdoor-transmission. Impinging jet ventilation (IJV) systems might be promising to ventilate densely occupied large spaces due to their high jet momentum. However, their performances in densely occupied spaces have rarely been explored. This study proposes a modified IJV system and evaluates its performance numerically in a densely occupied classroom mockup. A new assessment formula is also proposed to evaluate the nonuniformity of target species CO2. The infector is assumed as the manikin with the lowest tracer gas concentration in the head region. The main results include: a) Indoor air quality (IAQ) in the classroom is improved significantly compared with a mixing ventilation system, i.e., averaged CO2 in the occupied zone (OZ) is reduced from 1287 ppm to 1078 ppm, the OZ-averaged mean age of air is reduced from 439 s to 177 s; b) The mean infection probability is reduced from 0.047% to 0.027% with an infector, and from 0.035% to 0.024% with another infector; c) Cooling coil load is reduced by around 21.0%; d) Overall evaluation indices meet the requirements for comfortable environments, i.e., the temperature difference between head and ankle is within 3 °C and the OZ-averaged predictive mean vote is in the range of −0.5 - 0.5; e) Thermal comfort level and uniformity are decreased, e.g., overcooling near diffuser at ankle level. Summarily, the target system effectively improves IAQ, reduces exhaled-contaminant concentration in head regions, and saves energy as well.

Reduction of risk of choosing the optimal ventilation mode for the period of elimination of exogenous fire

The time from the occurrence of an exogenous fire in a mine to its complete elimination can be conventionally divided into two periods: the operational time of the emergency elimination plan and the period of intensive fire extinguishing or fire cell isolation. In the first period, there is a significant number of working people in the mine, so the emergency ventilation mode must first of all ensure safe conditions for their evacuation. The issue of choosing an emergency ventilation mode in the mine ventilation network for use during the operational time of the emergency liquidation plan has been studied in sufficient detail. At the second stage of fire development, the ventilation mode should ensure the removal of combustion products by the shortest paths to the exit jet or to the workings where there are no people; to provide fresh air supply, normal temperature and minimal smoke in the areas where mining rescue works are carried out; reduce the intensity of fire development; to prevent overturning of ventilation jets in inclined workings. Among the listed requirements, there are both those that satisfy and those that contradict the criterion of the first period. Therefore, in a number of cases, during the liquidation of developed fires, it is necessary to change the ventilation mode to ensure the fulfillment of the considered conditions. A method of transition from the mode of the first period to the mode of the second is proposed, which consists in determining the list of ventilation modes that are subject to optimization. For each of them, workings are defined, in which it is possible to overturn the ventilation jet. Due to the minimization of their number, it is possible to prevent the spread of a fire zone gassed with gaseous products (that is, its minimization) and to complicate the conditions of conducting mine rescue operations. For this purpose, the theory of interrelationship of aerodynamic parameters of mine workings is used, which simplifies multi-fan ventilation calculations. The described algorithm only seems somewhat cumbersome, since it is known from practice that in the area of action of intense thermal depression of the fire cell, several loosely connected workings cannot be located far from each other, with a possible spreading of the ventilation jet. Thus, by achieving the condition of non- spreading of the ventilation jet for one of the working, it is possible to indirectly solve the problem for a number of other workings, incidental to it, which significantly reduces the complexity of the calculation process. Keywords: exogenous fire, emergency ventilation mode, thermal depression, interrelationship of aerodynamic parameters.

Experimental Investigation on the velocity profile of supply flow in impinging jet ventilation system

Using the impinging jet ventilation system (IJV), it is possible to accomplish high ventilation effectiveness by creating temperature and contaminant stratification within the room. Since the air is supplied toward the floor and directly spreads into the occupied zone at the lower level, it is important to understand the flow feature of supplied jet around the floor. To understand this, the velocity profile of the jet over the floor at the central cross-section was measured using hotwire anemometer under isothermal conditions, and particle image velocimetry (PIV) under isothermal, cooling, and heating conditions. As a result, the obtained velocity profiles at the central cross-section by the hotwire anemometer and PIV are almost the same in the region more than 0.5 m horizontally away from the supply duct. The velocity in the region close to the supply duct was underestimated when using PIV, due to the insufficient entrainment of the seeding tracer. However, its measurement accuracy is assumed to be sufficient for the flow that goes into the occupied zone. In addition, it was also shown that at the central-cross section, the velocity profiles under isothermal and cooling conditions are almost the same.

Thermal Environment, Ventilation Effectiveness, and Infection Risk of Restaurant with Impinging Jet Ventilation

The basic strategy of the impinging jet ventilation system (IJV) is to keep high air quality within the occupied zone. In IJV, the air supplied from ducts impinges on the floor and spread through the lower level of the room. When the air reaches the heat sources, it rises upward and is exhausted around the ceiling. Most of the previous works about IJV focus on simple room set-ups, whereas the studies focus on realistic set-ups are limited. To investigate the applicability of IJV to a more practical situation, CFD analysis was conducted in a room that simulated a restaurant. In this numerical study, thirty-two seated occupants were distributed in the restaurant hall as the heat and contaminant sources (contaminant was released from their mouth), while a large amount of heat was generated by the equipment in the kitchen. The indoor environment of IJV was compared to that of the mixing ventilation system (MV) in terms of thermal environment, ventilation effectiveness, and infection risk. The results showed that IJV were superior to MV in terms of air conditioning efficiency, pollutant removal efficiency, and infection risk reduction. In conclusion, the results suggest that IJV can improve the indoor environment.

Analysis of the state of the air environment in the underground parking

Preserving the ecological comfort of the urban environment forces architects to look for compromise solutions. One of them is the development of underground urbanism not only for transport infrastructures, but also for public buildings. In this case, environmental issues are relevant. The air quality in underground parking lots and in the adjacent area must comply with environmental standards. Underground parking lots are local sources of pollution. Therefore, during the construction of parking lots, design solutions should be carefully analyzed, especially ventilation issues. An effective method is mathematical modeling. The article considers the use of numerical simulation for the organization of ventilation using jet ventilation. The results of numerical simulation of a system of differential equations describing the processes of heat and mass transfer using a modern system of jet ventilation are presented. The use of jet fans makes it possible to ensure the permissible concentration of CO in the exhaust shafts. It is substantiated that the choice of locations for jet fans should be based on the analysis of velocity fields and concentrations of harmful substances. The article considers the features of jet ventilation in underground car parkings. The results of a numerical simulation of a system of differential equations describing heat and mass transfer processes using a modern jet ventilation system are presented using the example of an underground parking.

Numerical Investigation of Very Low Reynolds Cross Orifice Jet for Personalized Ventilation Applications in Aircraft Cabins

This study focuses on the numerical analysis of a challenging issue involving the regulation of the human body's microenvironment through personalized ventilation. We intended to first concentrate on the main flow, namely, the personalized ventilation jet, before connecting the many interacting components that are impacting this microenvironment (human body plume, personalized ventilation jet, and the human body itself as a solid obstacle). Using the laminar model and the large eddy simulation (LES) model, the flow field of a cross-shaped jet with very low Reynolds numbers is examined numerically. The related results are compared to data from laser doppler velocimetry (LDV) and particle image velocimetry (PIV) for a reference jet design. The major goal of this study is to evaluate the advantages and disadvantages of the CFD approach for simulating the key features of the cross-shaped orifice jet flow. It was discovered that the laminar model overestimated the global jet volumetric flow rate and the flow expansion. LES looks more suitable for the numerical prediction of such dynamic integral quantities. In light of the computational constraints, it quite accurately mimics the mean flow behavior in the first ten equivalent diameters from the orifice, where the mesh grid was extremely finely tuned. From the perspective of the intended application, the streamwise velocity distributions, streamwise velocity decay, and volumetric flow rate anticipated by the LES model are rather well reproduced.

Research of the round convective air jet of the exhaust local ventilation

AbstractThe article is devoted to research of properties of the round convective air jet. The aim of this work is to establish universal graphical dependencies and empirical formulas for describing velocity and temperature fields over the entire range of development of round convective exhaust ventilation jet; development of an algorithm for solving the transcendent problem of determining the surface temperature of a heat source; introduction of velocity and temperature attenuation coefficients for round convective jet; visualization of its characteristics in the form of a 3D image; achieving reduction of metal consumption of the local exhaust ventilation system due to the overall optimization of the velocity and temperature fields of the round convective air jet.

Pulsating jet ventilation add-ons performance for reducing the contaminant spread in classrooms: Portable air cleaners vs. upper room UVGI

This paper examines the extent to which “add-on” cleaning devices in a classroom ventilated with a pulsating jet ventilation (PJV) system are able to reduce the contaminant spread risks between students when one of them is infected. Two types of “add-on” devices are investigated: portable air cleaners (PACs) and upper room ultraviolet germicidal irradiation (UR-UVGI) lamps. The cleaning effectiveness of each system is evaluated by comparing the contaminant concentration reduction ratio (CR) within the breathing layer in each group of students and the intake fraction (iF) with their corresponding values of standalone PJV operation under the same conditions. Detailed 3D computational fluid dynamic (CFD) models were developed and validated against published experimental data. A parametric analysis was performed by varying the PJV supply flowrate and its period of intermittency to establish the PJV operating conditions that maximize the cleaning and protection effectiveness of each “add-on” device at acceptable thermal comfort and CO2 levels.It was found that for maximum cleaning effectiveness, the PJV system is recommended to operate with an UR-UVGI system at supply flowrate between 250 l/s and 350 l/s with a range of intermittency periods between 4 min and 5 min. However, for a maximum protection against cross-contamination, the PJV system should operate with PAC devices at 400 m3/h for PJV flowrate ranging between 250 l/s and 350 l/s irrespective of the intermittency period with iFmax values between 1.47×10−4 and 0.67×10−4. The addition of “add-ons” resulted in a maximum of 7% increase in the overall energy consumption.

Numerical investigation of the thermal and ventilation performance of a combined impinging jet ventilation and passive chilled beam system

Impinging jet ventilation (IJV) systems provide high ventilation efficiency and good indoor air quality (IAQ) in the cooling mode. However, they have a limited cooling capacity. Passive chilled beam (PCB) systems are widely used in indoor environments with high cooling loads and can potentially address the limitation of low cooling capacity of IJV. In this study, the possibility of combining IJV and PCB systems is investigated using computational fluid dynamics (CFD) simulations. The effects of two main factors, namely the percentage of cooling load removed by the PCB system (η) and supply air parameters (Lm) of the IJV system, on the thermal and ventilation performance of the IJV–PCB system are examined. The results indicate that the PCB system enhances the mixing of indoor air and effectively reduces the vertical temperature gradient in the IJV room. An optimal range of η that improves the cooling capacity and maintains the high ventilation performance of IJV is determined. This range for an IJV–PCB system is 0.15 ≤ η ≤ 0.45, considering thermal comfort, IAQ, and energy saving potential. In addition, the IJV–PCB system offers a wide selection range for Lm (0.4–1.2) compared with that of the IJV, and a high ventilation efficiency and good IAQ are maintained in the room in this range.

Optimization study of heating performance for an impinging jet ventilation system based on data-driven model coupled with TOPSIS method

Impinging jet ventilation (IJV) is believed to create good indoor thermal comfort and air quality (IAQ) in an energy efficient way. However, since there is little discussion about the relationship between its heating performance and airflow patterns, operation control of ventilation parameters (e.g., supply temperature, airflow rate, discharge height and nozzle shape) is not clear. To achieve a good heating performance for IJV, operation conditions are optimized by using data-driven model coupled with technique of order preference by similarity to ideal solution (TOPSIS). Draught discomfort (PD), air change efficiency (ACE) and energy utilization coefficient (EUC) are modeled as performance indicators. First, response surface methodology (RSM) and artificial neural network (ANN) are employed to establish predictive models for the performance indicators, a comparison between the two methods are then performed from prediction error analysis. It shows that both RSM and ANN can predict the ACE and EUC well, but compared to ANN, RSM is less reliable in estimating PD and may fall into the risk of misjudging comfort level. Then, the ANN is used together with the TOPSIS to optimize the IJV for heating and a square nozzle is better preferred among the studied nozzle shapes. Moreover, optimal conditions of supply parameters are determined and verified for different nozzle characteristics. Overall, the current results not only can provide reference for the design and operation control of ventilation parameters of IJV for heating, but also contribute to the practical applications of ANN in different ventilation scenarios.