Radial Fan Research Articles

Machine Learning Methods for Evaluation of Technical Factors of Spraying in Permanent Plantations

Considering the demand for the optimization of the technical factors of spraying for a greater area coverage and minimal drift, field tests were carried out to determine the interaction between the area coverage, number of droplets per cm2, droplet diameter, and drift. The studies were conducted with two different types of sprayers (axial and radial fan) in an apple orchard and a vineyard. The technical factors of the spraying interactions were nozzle type (ISO code 015, code 02, and code 03), working speed (6 and 8 km h−1), and spraying norm (250–400 L h−1). The airflow of both sprayers was adjusted to the plantation leaf mass and the working pressure was set for each repetition separately. A method using water-sensitive paper and a digital image analysis was used to collect data on coverage factors. The data from the field research were processed using four machine learning models: quantile random forest (QRF), support vector regression with radial basis function kernel (SVR), Bayesian Regularization for Feed-Forward Neural Networks (BRNN), and Ensemble Machine Learning (ENS). Nozzle type had the highest predictive value for the properties of number of droplets per cm2 (axial = 69.1%; radial = 66.0%), droplet diameter (axial = 30.6%; radial = 38.2%), and area coverage (axial = 24.6%; radial = 34.8%). Spraying norm had the greatest predictive value for area coverage (axial = 43.3%; radial = 26.9%) and drift (axial = 72.4%; radial = 62.3%). Greater coverage of the treated area and a greater number of droplets were achieved with the radial sprayer, as well as less drift. The accuracy of the machine learning model for the prediction of the treated surface showed a satisfactory accuracy for most properties (R2 = 0.694–0.984), except for the estimation of the droplet diameter for an axial sprayer (R2 = 0.437–0.503).

Development of a cabin for fast freezing in a household refrigerator and examination of its effects on the quality characteristics of beef

In this study, a cabin design was made for fast freezing in household refrigerators using different fan types (radial fan velocity of 1100, 1500 and 1900 rpm) and axial (1350 rpm) and the effects on the quality characteristics of beef were examined. Before the freezing process, the beef (Semitendinosus) was sized at 10 × 10 × 2 cm as a single fillet; 2 × 2 × 2 cm as the cubed sample and the minced beef was prepared by the butcher from the same meat and shaped with the dimensions of 10 × 10 × 2 cm. It was seen that when the fan velocity was 1900 rpm during the freezing process, the weight (0.39–11.61 %) and cooking loss (26.69–44.66 %) values of the beef samples decreased. A decrease was observed in the TBARS values (0.34–0.87) of the sample as the radial fan velocity increased in radial fan. When the total color change values (3.96–7.59) of all beef samples were examined, it was seen that the least color change was achieved with the axial fan before and after cooking. When the textural properties of the meat were examined before and after cooking, it was observed that the hardness decreased as the radial fan velocity increased, and the lowest hardness value was obtained from freezing with the axial fan. In addition, porosity values decreased and protein denaturation temperatures increased due to the formation of smaller ice crystals with the axial fan. As a result, it has been observed that fan type and velocity have significant effects on accelerating the freezing process and preserving the quality of beef samples.

Determination of the Effect of Different Energy Classes of Household Refrigerators on the Freezing Process and the Quality Characteristics of Beef

The household refrigerator model used for freezing processes in this study was produced in the factory in different energy classes (C, D, and E). Equal amounts of beef (10 × 10 × 2 cm; 2 × 2 × 2 cm) and minced beef (10 × 10 × 2 cm) were placed in refrigerator bags before freezing. The freezing processes were carried out by placing beef samples on the top shelf where the radial fan was located in the freezer compartment of the refrigerators. After the frozen samples were thawed at +4°C, they were cooked in a water bath at 85°C. It was determined that the samples frozen in the refrigerator belonging to the D energy class at −24°C had shorter freezing times and therefore higher freezing rates. It was observed that pH (5.54–5.72) values of samples frozen in the D energy class were higher due to lower weight loss (0.32%–6.80%) values. When their color values were examined, the redness (a∗) values (15.09–17.61) were the highest, while the yellowness (b∗) values (10.31–13.29) were the lowest in these samples. In addition, the hardness (49.00–182.74) and chewiness (16.35–71.80) values of samples frozen in Energy Class D were found to be lower, while their protein denaturation temperatures were higher due to shorter freezing times. Consequently, in this study, the effects of the difference in energy classes of refrigerators on the quality characteristics of beef samples were examined, and the refrigerator belonging to the energy class (D) that gave the best quality properties was found to be the most suitable one for freezing the beef.

Off-design performance analysis of a radial fan using experimental, computational, and artificial intelligence approaches

Radial fans play a critical role as indispensable turbomachines in various industrial sectors. However, the conventional manufacturing process for these fans is often characterized by its resource-intensive and time-consuming nature. Traditionally, computational fluid dynamics (CFD) has been the go-to method for predicting and analyzing the performance of radial fans at different geometrical and operational conditions. Yet, in recent years, the rapid advancements in machine learning (ML) and deep learning (DL) techniques, particularly the rise of artificial neural networks (ANNs), have propelled significant progress in the field of predicting and optimizing the performance of radial fans. The present study aims to analyze the performance of a radial fan through a comprehensive experimental investigation and a meticulous three-dimensional numerical simulation. Subsequently, in order to predict the off-design performance of the fan, an extensive set of numerical simulations is conducted at various volumetric flow rates and rotational speeds. These simulations are used to analyze the fan performance and identify the most efficient operating condition. Moreover, the simulations serve as inputs for a finely-tuned ANN architecture. The predictive accuracy of the ANN model for both interpolation and extrapolation cases is then compared against two alternative techniques, namely support vector machine (SVM) and random forest (RF). The results explicitly highlight the superiority of the ANN model in terms of its predictive accuracy, thereby solidifying its position as the most reliable method for predicting the performance of radial fans.

Development of a test rig for the investigation of flow-induced mechanisms of sound generation at radial fans

A low sound pressure level is a crucial quality feature for industrial and non-industrial radial fans. The scientific literature documents numerous mechanisms of flow-induced sound generation that can occur in a radial fan. Nevertheless, not all sound generation mechanisms are considered well-understood today and thus are still dealt with in ongoing research. This work develops an experimental setup to investigate the different mechanisms of flow-induced sound generation in radial fans. The aim is to close the existing gap between available experimental research on axial and radial fans. One critical factor for the experimental investigation of flow-induced sound generation in fans is the control of inflow. Due to the design of radial fans, the fluid flow deflects from the axial supply duct to the radial direction upstream of the impeller, generating a complex flow field with limited control possibilities. Hence, we designed a test rig that improves the control of inflow conditions, aiming to resolve the superposed sound generation mechanisms in acoustic measurements. This paper presents the key features of the test rig and some first experimental results. The investigation of the distinct sound generation mechanisms is left to future work based on the introduced test rig.

Design of centrifugal radial fans using regression analysis methods

With the development of scientific and technological progress in agriculture, the use of operational and mathematical modelling for effective solution of problems and resource conservation in the field of agricultural engineering is relevant. Therefore, the purpose of the study was to determine the optimal parameters of the centrifugal radial fan of a pneumatic precision seed drill by constructing a new mathematical model of the process of its operation. This was achieved by applying mathematical modelling methods when planning multi-factor experiments. As a result, a complex of automated experiments has been defined, which leads to a significant increase in the productivity of scientific work. A statistical representation of the experiment is established, which allows moving to a multi-factor active experiment, in which it is possible to separate the influence of factors from the noise background and make a transition to statistical methods for analysing the results. This allowed predicting the optimal characteristics of the centrifugal radial fan of the precision seed drill. In the course of this study, a new regression equation was compiled in the form of a first-degree polynomial, which determines the influence of each of the factors on the magnitude and value of the response. The coefficients of the polynomial are determined, the significance of the coefficients is estimated, and the adequacy of the proposed model is checked. After obtaining the regression equation, it became possible to graphically construct the dependence of the response function on impact factors. A fractional factor experiment was also performed, which determined the values of the parameters of the object’s state for all possible combinations of levels of variation of the factors Xi. Based on the established functional relationship between the output parameter of the fan, a regression equation of the following form is obtained: Pv=Pv(n, ß1, ß2, z). This predicted the receipt of the total pressure Pv (Pa), when setting different values of independent quantities n, ß1, ß2 and z. The application of the obtained analytical dependencies significantly simplified the determination of optimal design parameters of pneumatic systems for the development and construction of modern technical seed drills

Exergy-Based Efficiency Assessment of Fans vs. Isentropic Efficiency

The efficiency definition allows us to compare two machines with each other. In general, the efficiency is defined as the ratio of usable power to the required power. This raises the question: what is the usable power? Most engineers discuss efficiency on the basis of the energy balance, i.e., the first law of thermodynamics. In this paper, we derive the exegetic efficiency taking the second law of thermodynamics into account. Exergy analysis takes into account work and heat and is able to model reality very accurately. On this basis, a comparison between the isentropic and exergetic efficiencies is given. A high-pressure radial fan is used as an example, and the differences are discussed. Therefore, measurements of a non-adiabatic fan are evaluated, and the role of the heat flux in the environment is discussed. The investigations show that a relevant difference between the isentropic and exergetic efficiencies becomes apparent in the partial-load range with high-pressure build-up. The thermal energy contained in the flow belongs proportionally to the exergy, i.e., the working capacity of the gas relative to its environment. For a standard such as ISO 5801 “Fans—Performance testing using standardized airways”, the efficiency must not only be physically correct, it must also be simple and practical. Against this background, the outlook of this paper discusses when and which efficiency definition is appropriate and best suited for a standard.

Construction of pressure characteristics of a centrifugal radial fan using ANSYS CFX software package

Purpose. Improve the design and pressure characteristics of the centrifugal radial fan (CRF), reduce costs and design time by using modern design methods. Methods. Analytical study of the energy characteristics of the CRF using CFD software packages. Three-dimensional modeling of the flow of air in the flow part of the fan. Results. The paper describes the peculiarities of construction of the pressure characteristic of a centrifugal radial fan using the ANSYS CFX program. Numerical simulation of the flow was carried out to improve the initial indicators at the preliminary stage of the design of the CRF. This approach allows reducing costs and design time compared to the experimental approach and provides an opportunity to improve and analyze the performance of the fan and its design without manufacturing it. The use of a calculation complex of programs for the justification and analysis of the design results provides an opportunity to see the picture of the pressure distribution along the flow part, the field of velocity vectors and the movement of the air flow. By means of numerical modeling of the spatial air flow in the flow part of the fan, choosing the SST-turbulence model, the regularity of the change in the pressure characteristic of the fan was the distribution of velocities and pressures in different elements of the air conditioning system, at different values of the mass flow of air, was determined. An analysis of the change in total and static pressure in the flow part of the CRF was performed: in the stator – an inlet nozzle, in the rotor – a closed type impeller, and in the stator – made in the form of a snail. The question of the dependence of the total and static efficiency on the mass flow rate of the fan is also considered. Conclutions 1. Studies of the process of construction of the pressure characteristic of the CRF showed that the proposed approach allows you to reliably estimate the parameters of the fan’s operating modes, determine the main features of the change in determined. As a result of the calculation, efficiency and the distribution of full and static pressure in the elements of the flow part for its further improvement. 2. A distinctive feature of the proposed method of constructing the pressure characteristic is that in the early stages it is possible to predict the hydrodynamic parameters of the flow part of the designed fan without creating its solid-state model. And based on the results of a numerical study of the spatial air flow, it is possible to quantitatively and qualitatively analyze the elements of the flow part of the fan and specify their geometric dimensions for further calculation based on average parameters. 3. The ANSYS 19.0 CFX software complex allows you to immediately display changes in the design of fan assemblies and obtain the results of a numerical study of the spatial air flow in the flow part of the fan. Using the proposed graphic materials, it is possible to visually observe the processes taking place in the flow part of the CRF. The possibility of numerical calculation of the parameters of interest is also shown. 4. The creation of a real CRF to evaluate its performance requires significant funding and is time- consuming, while the use of CFD is fast and cost- effective. The ANSYS 19.0 CFX software package makes it possible to visually present a picture of the behavior of a wide range of process parameters that occur in the flow part of the fan and to show their relationship with the features of the geometry and dimensions of the fan. Keywords: total pressure, static pressure, nozzle, impeller, volute, CFD, mass flow, total efficiency, static efficiency.

Numerical simulation of gas-dynamic processes in the centrifugal radial fan of seeding machines

Improving the efficiency of crop production, where a significant place belongs to row crops (such as corn, sunflower, soybean, sorghum, sugar beet, etc.), is inextricably linked with the introduction of energy- and resource-saving technologies to ensure quality and timely implementation of production processes. Sowing is an important technological process. To increase the speed, as a consequence, productivity and, most importantly, quality of field works, at present, precision seeding seeders with pneumatic systems with improved characteristics of vacuum generators are used. In this case, the vacuum systems of such seeders are most often based on the use of a radial centrifugal fan. Therefore, an important task is to design the fan, taking into account the matching of its parameters with the parameters of the seeder as a whole, which requires a large number of tests and checks. The use of natural models (test tables) requires considerable time and resource expenses. On the basis of numerical simulation of gas-dynamic processes there is an opportunity to significantly reduce the number of full-scale experiments, and more accurately determine the rational form of the centrifugal radial fan. The purpose of this paper is to consider the method of numerical simulation of gas dynamic processes in a centrifugal centrifugal radial fan using computer-aided design (CAD) packages. The application of computational fluid dynamics (CFD) methods to discretize the solutions of differential equations taking into account the Euler and Navier-Stokes equations. Numerical modeling of turbulence based on k-ε models, k-ω models, and shear stress transfer (SST) models. The results of calculation of three-dimensional field of velocities and pressures in the fan working zone are presented, the rational geometrical characteristics and aerodynamic characteristics (dependence of pressure drop on the air consumption) are determined. Such approach to centrifugal fan design allows to unify significantly its parameters at the stage of development and to reduce the terms of new projects.

Examination of the Airflow Uneven Distribution over the Combine Harvester Cleaning System

The research aims to study the uneven distribution of airflow created by a fan over the cleaning system of a combine harvester, affecting the efficiency of the technological process of separating impurities from the original crop. The article presents a methodology for studying the actual operation process using a digital twin, reveals problem areas and studies even distribution of the airflow at the outlet of the fan discharge channel of the combine harvester cleaning system. During the research, several parameters were defined. Based on the digital twin development and study, the airflow rate at the outlet of the radial fan discharge duct of the combine harvester (CH) cleaning system at different rotation rates of the fan wheel (450-1050 min-1) was determined. Experimental measurements of the airflow distribution over the working part of the sieve shoe for the existing cleaning system and modern combine harvesters made up 3.75-10.2 m/s.

Sweep Effects on Fan–Intake Aerodynamics at High Angle of Attack

Abstract Sweep in a transonic fan is conventionally used to reduce design point losses by inclining the passage shock relative to the incoming flow. However, future low pressure ratio fans operate to lower Mach numbers meaning the role of sweep at cruise is diminished. Instead, sweep might be repurposed to improve the performance of critical high Mach number off-design conditions such as high angle of attack (AOA). In this article, we use unsteady computational fluid dynamics to compare two transonic low pressure ratio fans, one radially stacked and one highly swept, coupled to a short intake design, at the high AOA flight condition. The AOA considered is 35 deg, which is sufficient to separate the intake bottom lip. The midspan of the swept fan was shifted upstream to add positive sweep to the outer span. Based on previous design experience, it was hypothesized that the swept fan would reduce transonic losses when operating at high AOA. However, it was found that the swept fan increased the rotor loss by 24% relative to the radial fan. Loss was increased through two key mechanisms. (i) Rotor choking: flow is redistributed around the intake separation and enters the rotor midspan with high Mach numbers. Sweeping the fan upstream reduced the effective intake length, which increased the inlet relative Mach number and amplified choking losses. (ii): Rotor-separation interaction (RSI): the rotor tip experiences low mass flow inside the separation, which increases the pressure rise across the casing to a point where the casing boundary layer separates. The swept fan diffused the casing streamtube, causing the casing separation to increase in size and persist in the passage for longer. High RSI loss indicated that the swept fan was operating closer to the rotating stall point.

Noise mechanisms in a radial fan without volute

The noise emission of a large radial fan with 7 backward curved blades is investigated. When decreasing the flow rate, the broadband levels below 1 kHz increase and the tones decrease, and a broad hump appears at about 80% of the BPF. The present numerical investigation aims at identifying the mechanism responsible for the broadband hump in the spectra. The configuration is simulated using the Lattice Boltzmann PowerFLOW solver for four flow-rate conditions. The low flow-rate condition is run longer to achieve statistical convergence at low frequencies. The simulations capture reasonably well the acoustic spectra and in particular the broadband hump at lower flow rate. The flow in the fan shows an unsteady flow detachment in some blade passages shed from the leading edge of the blade, while other blade passages experienced a fully detached flow along the whole blade chord. A spectral proper orthogonal decomposition is applied to identify the modal structures of the flow responsible for this mechanism. Several azimuthal modes are obtained from the decomposition for the different frequencies in the acoustic spectra. In addition an axial acoustic mode in the fan bowl is found at a frequency in the broadband hump.

Inspection of Centrifugal Blower by Varying Different Blade Configuration using CFD

This examination points towards the advancement of an enhanced plan of a radiating blower comprising of different fan ribs, in light of execution appraisals looking like its inside parts. Different segments, for example, the outside cases and the turning fan ribs set in an assortment of working conditions, for example, fluctuating impeller speed and number of edges, are assessed mathematically and tentatively. Assessment depends on execution boundaries, including the delta and outlet pressures, stream rate, force, and intensity of the radial fan. The mathematical examination recommends that the blend of the different pivoting outline strategy and the standard k-ε disturbance model was suitable for recreation of the inside stream qualities and for power forecast. The mathematical outcomes were contrasted and tests under deliberately planned trial conditions. Plan and displaying of Impeller and packaging has been completed in CATIA V5R21 and then the Calculation was imported to Ansys 16.0. By differing the quantity of fan ribs, the exhibition fluctuates practically nothing. Nonetheless, the FC fan ribs display the best exhibition in regards to their stream rate reaction and are related with most reduced force. The weight at the exit is diminished as the stream rate is expanded. Among all the fans, the FC fan would yield the most noteworthy stream rate.

Air-cooled photovoltaic roof tile as an example of the BIPVT system – An experimental study on the energy and exergy performance

The air-cooled photovoltaic tile is a subject of presented investigations, which focused on improving the overall system efficiency of PV tiles with heat recovery. The operational efficiency of a PV roof tile, together with the construction optimising the air cooling efficiency, were the main points of plans realized at this research stage. The article describes the experimental research consisting of the assessment of electrical, thermal, and total efficiency, as well as exergy efficiency and parameters of a commercial photovoltaic (PV) roof tile, which back wall was cooled by flowing air. An influence of various cooling duct depths and various volumetric flow rates on the system operation was analysed. During the tests, a solar light simulator and a radial fan, providing the assumed volumetric flow rate of cooling air were used. It has been proven that the depth of the cooling duct and the air volumetric flow rate have a crucial impact on the obtained results. Air cooling the back wall of the PV roof tile, lowered the average surface temperature by a maximum of 6.3 K, while the temperature difference, between the surface next to the cooling air inlet and the surface next to its outlet, was a maximum of 23.4 K. Both values were obtained for air cooling with a volumetric flow rate equal to 4 m3/h and a channel depth of 25 mm, with a solar irradiance of 900 W/m2. The overall efficiency was calculated as a sum of the electrical an thermal efficiencies. Its maximal obtained value was about 32%, wherein the highest thermal efficiency was at the level of 27%. An exergy analysis was performed and the exergy efficiency between 5.08% and 9.94% was determined. These results are promising for future utilization of the system consisted of the PV roof tiles together with the cooling ducts.

Development of environmental protection system for installation of chrome plating of the internal surfaces of hydraulic drives with hydrostatic guideways

Electroplating is an electrochemical process when a metal layer is deposited on the surfaces of a product. As an electrolyte, a solution of the salts of the deposited metal is used, the vaporization and micro-spray of which have an extremely negative and dangerous effect on humans and the environment. In this work, we present an environmental protection system for implementing the process of chrome plating of the internal surfaces of a hydraulic drive with hydrostatic guideways is presented. The schematic diagram of the environmental protection system includes the first stage of air purification (drip collector), the second stage of air purification (granular filter), as well as a system of granular filter cleaning and a radial fan. To clean the exhaust air from harmful substances, such as aerosols of chromium oxides and sulfuric acid, as well as water vapor, a comprehensive gas purification system for emissions of pollutants is proposed, consisting of step-by-step cleaning in various devices, including a drip collector with two droplet-breaking elements and a granular filter. The presented design of the environmental protection system equipment of the installation for chrome-plating the internal surfaces of a hydraulic drive with hydrostatic guideways will make it possible to effectively neutralize the air environment by cleaning the air from chrome anhydride vapor and other pollutants.

A study on the noise reduction of bi-direction radial fan

A study on the noise reduction of bi-direction radial fan

Development of a Novel Low-cost Lung Function Simulator

Abstract In order to test medical devices, industry increasingly uses simulators closely reassembling the behaviour of physiological systems. In the context of respiratory therapy, most available simulators are designed based on a ventilated volume. This highly adjustable volume allowing for fast dynamical changes often leads to very costintensive test devices, particularly when incorporating realistic spontaneous breathing. Therefore, in this article we introduce a novel concept for a low-cost lung simulator, capable of mimicking the ventilation behaviour of the human lung at the Y-piece of a mechanical ventilator. The proposed design does not require any enclosed spaces to hold inhaled air nor expensive precise linear actuators adjusting its volume. Instead, the setup is designed based on the design of a mechanical ventilator, connecting the system with one port to the ventilator and then dividing the hose into two independent branches. Each branch has an integrated radial fan and a proportional valve, controlling the inspiratory and expiratory flow, individually. The mass flow and pressure are measured at the systems inlet port, representing the condition at patient airway. In contrast to existing setups, the proposed design is not limited by the physical properties of a volume such as fixed maximum size, allowing the simulation of various types of patients and conditions. Numerical simulations to evaluate this system design showed the ability to generate a realistic spontaneous breathing pattern. With a first experimental setup it was possible to prove the feasibility of this approach, by generating common flow curves during spontaneous breathing. Building on this design, the approach could eventually lead to a more accessible method for testing.

Analysis of cooling of electric motor by radial fan; realization of the experimental analysis of CFD

У цій статті показано аеродинамічний аналіз вентиляторів і їх кожухів різних геометрій. Гарне обдування знижує температуру в двигуні та збільшує термін його служби. Зниження температури на 10 градусів може продовжити термін служби електричної ізоляції двигуна в два рази. Для визначення оптимальної геометрії вентилятора і його кожуха, а також оцінки її ефекту, аналіз проводиться при однакових умовах. Метою цього дослідження є визначити стан проектованого електродвигуна, який не має прототипу. Для кореляції аналізів з натурними експериментами був використаний параметр - швидкість входу повітря. Експериментальні результати можуть бути використані для проектування електродвигунів, а також для оптимізації їх аеродинамічних характеристик.

CFD analyses of a radial fan for electric motor cooling

Fans are commonly used to cool electric motors. They can be mounted directly on the electric motor shaft providing a simple and inexpensive cooling system. The fan sizing is crucial to ensure safe operating temperatures of the electric motor.Referring to the self-ventilated motors, in this paper a numerical model has been developed and validated for a given radial fan. Afterwards, numerical analyses have been done in order to assess the performance of fans characterized by different shapes. Dimensionless characteristic curves have been calculated varying the wheel aspect ratio and the number of blades.Calculations show that, for a given blade number, the dimensionless flow capacity depends on the aspect ratio of the impeller. Furthermore, for a given geometry, there is an optimal number of blades that maximizes the flow rate processed by the fan.Results allow to obtain relationships useful to the right choice or sizing of such fluid machines.

Performance of an innovative VUV-PCO purifier with nanoporous TiO2 film for simultaneous elimination of VOCs and by-product ozone in indoor air

An innovative vacuum ultraviolet photocatalytic oxidation (VUV-PCO) air purifier, consisting of a photocatalytic unit bearing nanoporous TiO2 film, an ozone removal unit bearing Mn-Fe catalyst and a radial fan, was designed and constructed. The performance of the VUV-PCO air purifier in simultaneous elimination of VOCs and O3 by-product was, for the first time, evaluated in a sealed actual room. The evaluation was conducted in both intermittent on/off and continuous operations. The results illustrated that the air purifier had high efficiency in removing formaldehyde and moderate efficiency in removing benzene, toluene, ofm-xylene, ortho-xylene, pentanal, octanal and nonanal, which were released from particleboard into the sealed room. During the removal of formaldehyde decomposition and TVOC in intermittent three-time on/off operation, the air purifier exhibited good stability. During the operation without heating, the air purifier had high formaldehyde and TVOC removal efficiencies, reaching values of about 48.00% and 78.71%, respectively after 90 min. During the continuous operation, the air purifier was able to continuously and effectively remove formaldehyde, benzene homologues, aldehyde and ketone compounds, while the ozone removal unit was able to effectively eliminate ozone generated during VUV photocatalysis. The removal of TVOC by 38.25% was reached after 240 min. In addition, heating the ozone removal unit was found to not only accelerate the release of VOCs from particleboard, but also promote the decomposition of ozone. The ozone removal unit operated with heating was able to reduce ozone content from 250 to 75 ppb.