Improved Ventilation System Research Articles

Adaptive strategies and thermal perceptions in intermittently used congregational Spaces: A case study

In spaces with considerable volumes that are sporadically used and typically not operating at full capacity, existing thermal comfort models face limitations. This research aims to reveal disparities between these models and survey-based comfort assessments. Comfort calculations were conducted using conventional thermal comfort models based on measured parameters and compared with survey data. Notable differences prompted the formulation of a more robust correlation, accounting for 83.4 % of the variations in Predicted Mean Votes (PMV). A regression model derived from survey data shows a high coefficient of determination (R2 = 0.84), supporting its applicability for large intermittently used spaces like mosques. Addressing limitations of existing models, this research introduces a practical and simplified approach to predicting thermal comfort, enhancing assessments in these distinctive spaces. The study also examines mosque indoor air quality dynamics. Despite sporadic ventilation, CO2 levels rose from 1500 ppm to 2500 ppm during Friday prayers, posing potential health risks. Before prayers, indoor CO2 and humidity met ASHRAE Standard 62, ISO 7730, and EN15231 values. To mitigate health concerns from elevated CO2 levels, improved ventilation systems are necessary. Comfort temperatures were only achieved during prayer periods.

Ventilation and Public Health: A Fraught History.

Since the beginning of the COVID-19 pandemic, a vigorous public health discussion has arisen over indoor air quality and ventilation. In popular press articles, bestselling books, and the US Environmental Protection Agency's recently announced Clean Air in Buildings Challenge, scholars and policy experts have claimed that improved ventilation systems can lead to better productivity and performance. By reevaluating those claims in light of the history of public health in Great Britain and the United States, we found that better ventilation has frequently been proposed as a cost-effective and nonintrusive means of improving health in institutions experiencing structural and environmental public health problems. Furthermore, our examination of efforts to provide ventilation for enslaved people, incarcerated people, and the urban poor revealed a consistent lack of government regulation and a disassociation of air quality concerns from broader environmental, social, and economic realities. By continuing to ignore these broader contexts, current ventilation efforts risk repeating this pattern. (Am J Public Health. 2024;114(8):798-804. https://doi.org/10.2105/AJPH.2024.307670).

DEVELOPMENT OF CONSTRUCTIVE DESIGN OF PICKLING UNITS FOR OPERATION IN HIGHLY AGGRESSIVE HOT SULPHURIC ACID SOLUTIONS

Problem statement. Technological process of metallurgical, pipe-rolling, chemical and other enterprises includes chemical treatment of metal products by pickling in hot (60–80 °C) sulphuric acid solutions with a concentration of 20–22 %. This treatment method is conducted in the pickling departments of enterprises in special containers (pickling units). Pickling solution of the specified concentration and temperature is a highly aggressive environment for all building structures made of traditional materials. Existing pickling units for chemical treatment of metal products do not ensure reliability and durability and are destroyed after 1-2 years of operation. Therefore, ferrous metallurgy enterprises that have pickling departments for chemical treatment of metal structures are classified as enterprises with a highly aggressive environment and their design should be developed with these conditions under consideration. The purpose of the work: Searching for and implementing mechanisms to improve the resistance of polymer concrete in aggressive environments in production. The object of research – is furan resins modified polymer concrete. The subject of the research – investigation of the particularities and improvement of constructive design for pickling baths made of materials based on polymer concrete in an aggressive environment and its implementation in production. Main part. Development of constructive design for technological pickling units made of structural corrosion-resistant material (furan resins modified polymer concrete). Conclusions. Pickling of metal products at ferrous metallurgy enterprises is conducted in highly aggressive hot sulphuric acid solutions of 20–25 % concentration at a temperature of 60–80 °C. Under the conditions of constant exposure to highly aggressive hot sulphuric acid solutions, even protection with chemically resistant materials does not ensure the required reliability and durability. To manufacture such structures, a new structural material is needed that combines chemical resistance with strength and durability. This material is a structurally chemical-resistant polymer concrete based on thermoset furan resins, which have high strength and universal chemical resistance, allowing us to solve the problem of reliability and durability of technological units for chemical treatment of metal structures at ferrous and non-ferrous metallurgy enterprises in a fundamentally new way. New constructive design for pickling units made of reinforced polymer concrete was developed in conjunction with shock-absorbing bars and an improved ventilation system, consisting of individual elements of full factory readiness weighing no more than 5 tonnes, which allows them to be transported and installed in operating pickling workshops using existing mechanisms.

COVID-19 Pandemisinin Mimari Mekân İhtiyaçları Üzerindeki Etkisi

COVID-19 pandemic, the built environment has faced significant transformations and adaptations to address emerging challenges and public health concerns. This review explores the significant implications of the COVID-19 pandemic on architecture and urban design. Key developments include the rise of home office design to accommodate remote work, increased reliance on digital infrastructure for essential services, the revitalization of public and green spaces, and design adaptations for social distancing. Building designs now prioritize wider corridors and open-air spaces to enable safe circulation, improved ventilation systems to reduce infection risk, and antimicrobial materials for enhanced cleanliness. Moreover, digital technologies, such as smart building systems and AI-driven safety measures, play a central role in post-pandemic designs. These transformations collectively aim to create healthier, adaptable, and resilient built environments ready to face future challenges.

Evaluating Reduction in Thermal Energy Consumption across Renovated Buildings in Latvia and Lithuania

Currently, the optimization of thermal energy consumption in buildings is considered a suitable alternative in the construction of new buildings, as a result of which the overall energy efficiency of the building increases. Thus, this study examined the efficiency and efficacy of different building renovation packages conducted across several buildings in Latvia and in Lithuania (across a larger building stock). In the first section of this study, 13 multi-apartment residential houses with 3 building renovation packages have been investigated in the city of Daugavpils, Latvia, in order to determine the actual reduction in heat energy consumption across each of the renovation implementation packages. The study findings indicate that changes in Latvian building regulations regarding insulation thickness did not significantly impact thermal energy consumption in fully renovated buildings. However, the combination of facade renovations, upgraded heating systems, and improved ventilation systems resulted in substantial energy savings, with an average reduction of 50.59% in thermal energy consumption for space heating across the reviewed multi-apartment residential building stock. In the following section of this study, the impact of the Energy Performance of Buildings Directive (EPBD) on building energy efficiency in Lithuania has been examined. The results show that over a 10-year period in the 2000s, Lithuanian building stock experienced a 20% increase in energy efficiency, followed by an additional 6.3% increase between 2010 and 2016. The mandatory requirement for renovated buildings to achieve a minimum energy efficiency class has resulted in significant reductions in energy consumption for heating purposes. The findings underscore the effectiveness of building renovation packages and the EPBD regulations in enhancing energy efficiency and promoting sustainable building practices. The importance of heat metering, consideration of indoor air temperature, and the need to address indoor air quality during renovations were also highlighted.

Energy use and energy efficiency in cruise ship hotel systems in a Nordic climate

In light of climate change, the shipping industry is committed to reducing its greenhouse gas emissions. When transitioning from fossil fuels to low-carbon fuels, it is crucial to also reduce the ships' energy need. For cruise ships, the hotel system is a major energy consumer and the focus of this paper. This study aims to investigate the energy use of an existing fossil-fuelled cruise ship operating in a Nordic climate, and evaluate the effectiveness of various passive and active energy-saving measures. For this purpose, a dynamic energy model of the hotel system was developed in the building simulation tool IDA Indoor Climate and Energy (IDA ICE), including a customised weather file. Validation of the model was achieved through comparison with literature and some operational data from the actual cruise ship. Simulation results showed a total annual energy use of 55 MWh/passenger, with the hotel system accounting for 20%. The passive measures, such as increased insulation and improved windows, each resulted in less than a 1% reduction in the hotel's annual energy use. Larger energy savings were achieved by using heat pumps (38%), improved ventilation system (8–24%), and heating setback in port and during the night (5%). A hot water storage tank, charged with the engines' waste heat during sea operation, could reduce the use of auxiliary boilers, especially in port. A hot water tank of 600 m3 could cover 97% of the heating demand in port, thereby minimising the use of fuel-fired boilers.

Improved buoyancy-driver hybrid ventilation system for multiple-heat-source industrial buildings

An industrial building may have several heat sources which together create a high-temperature working environment that puts the health of workers at risk. Ventilation is an effective way to remove heat, but improperly designed systems may fail to create a healthy thermal environment. The performance of buoyancy-driven hybrid ventilation in a multi-heat-source industrial plant was investigated in this study. The effects of the height of the inlet above the floor and exhaust velocity on the hybrid ventilation performance were studied; properly increasing the above-floor inlet height appears to improve the thermal environment while excessive mechanical exhaust velocity leads to increased energy consumption with a negative impact on ventilation efficiency. The optimum parameters of the improved ventilation system were determined and compared against existing ventilation systems. In summer, the improved ventilation system shows an average temperature of 34.61 °C, which is 3.40 °C lower than the existing system. The allowed exposure time (AET) is 52 min, which is 18 min longer than the existing system. In winter, the improved ventilation system shows an average temperature of 18.68 °C, which meets the design requirements for industrial buildings. The improved ventilation system can provide thermally comfortable conditions in both summer and winter.

Assessment of professional risks for employees of the foundry of the "Production company" LLC (Irkutsk)

Based on the analysis of regulatory documents on risk management, the choice of methods for assessing professional risks for workers in the foundry of a heavy industry plant was justified. The FineKinney and Matrix methods as the most simple to use, but effective and widely used were chosen, and the professional risks for the main professions of the foundry workers were assessed. The article aims to study the influence of the complex impact of harmful and hazardous production factors of foundries on the level of occupational risk for employees of structural divisions and enterprises of the metallurgical industry using the example of LLC Production Company, Irkutsk. It was shown that the Fine-Kinney method can be considered a reliable tool for making management decisions. The matrix method gives a clear qualitative picture. The probabilities of occupational risks associated with the technological process were determined. They can be reduced by taking measures aimed to improve working conditions even for one hazard source. Recommendations for improving the working conditions of the foundry workers were provided: modern equipment taking into account BAT, advanced PPE, air spraying, gas cleaning units and an improved ventilation system. These measures can significantly reduce the level of professional risk of employees.

An improved ventilation system for settling stage of a wastewater treatment plant: a computational simulation analysis

The present study examines the development of a push-pull ventilation system with localized extraction located for use in wastewater treatment. The proposed approach aims to minimize the concentration of H2S in the settling stage of a wastewater treatment plant located in Santiago de Chile. Computational fluid dynamic simulations were implemented, and these were contrasted with actual measurements of H2S emission to assess and to improve the existing forced crossed ventilation system in place. Along with the measurement of H2S emissions, other important operating parameters of the existing ventilation system, including air velocity and NH3 concentration were measured. The measurements at different positions of the settling stage of the wastewater treatment process showed H2S concentrations as high as 21 mg/m3 at the center over the water surface when utilizing the existing crossed ventilation system. In general, the measured H2S concentrations agree with those predicted by computational simulations, with discrepancies between 8.1% and 28.4%. An assessment of the improved ventilation system with localized extraction systems (push-pull) was carried out to determine the level of effectiveness of decreasing the concentration of H2S in the settling plant. According to the obtained results, the concentration of H2S in the corridors of the plant does not surpass 7.5 ppm, which meets the required Chilean regulation.

Optimization of mine ventilation network feature graph.

A ventilation network feature graph can directly and quantitatively represent the features of a ventilation network. To ensure the stability of airflow in a mine and improve ventilation system analysis, we propose a new algorithm to draw ventilation network feature graphs. The independent path method serves as the algorithm's main frame, and an improved adaptive genetic algorithm is embedded so that the graph may be drawn better. A mathematical model based on the node adjacency matrix method for unidirectional circuit discrimination is constructed as the drawing algorithm may not be valid in such cases. By modifying the edge-seeking strategy, the improved depth-first search algorithm can be used to determine all of the paths in the ventilation network with unidirectional circuits, and the equivalent transformation method of network topology relations is used to draw the ventilation network feature graph. Through the analysis of the topological relation of a ventilation network, a simplified mathematical model is constructed, and network simplification technology makes the drawing concise and hierarchical. The rapid and intuitive drawing of the ventilation network feature graphs is significant for optimization of the ventilation system and day-to-day management.

A Risk Analysis Method for Estimation of Financial Benefits of the Existing Mine Ventilation System

A case study was conducted on a metal mine operating in Kazakhstan, in which problems were associated with use of a complicated and outdated ventilation system and its high expenses. The mine needs to reconsider its existing ventilation system and identify the risks associated with operational losses when using this ventilation system. The aim of this study was to develop an efficient risk analysis method capable of estimating operational risks and financial benefits of the existing mine ventilation system. The developed risk analysis method considers ventilation modelling, risk modelling, and financial modelling. Ventilation modelling comprises ventilation simulation and ventilation financial simulation. In risk modelling, the number of risk events occurring with the use of existing ventilation system and the operational losses during these events is estimated. Financial modelling considers operational losses and ventilation financial simulation benefits and uses a dynamic cash flow model to estimate how cost variability influences the cash flow. As a result, the improved ventilation system attains an additional NPVa ranging from 3.2 to 8.5 million US$ at the corresponding defined probability of 90%. The results of this study reveal that the developed risk analysis method can efficiently estimate the financial benefits of ventilation modelling and consider risk events and their total operational losses associated with use of the existing ventilation system. This approach provides a range of possible outcomes and helps with deciding whether the ventilation system is appropriate or whether it should be updated to better suit the project financial benefits.

Efficacy of an ambulance ventilation system in reducing EMS worker exposure to airborne particles from a patient cough aerosol simulator

The protection of emergency medical service (EMS) workers from airborne disease transmission is important during routine transport of patients with infectious respiratory illnesses and would be critical during a pandemic of a disease such as influenza. However, few studies have examined the effectiveness of ambulance ventilation systems at reducing EMS worker exposure to airborne particles (aerosols). In our study, a cough aerosol simulator mimicking a coughing patient with an infectious respiratory illness was placed on a patient cot in an ambulance. The concentration and dispersion of cough aerosol particles were measured for 15 min at locations corresponding to likely positions of an EMS worker treating the patient. Experiments were performed with the patient cot at an angle of 0° (horizontal), 30°, and 60°, and with the ambulance ventilation system set to 0, 5, and 12 air changes/hour (ACH). Our results showed that increasing the air change rate significantly reduced the airborne particle concentration (p < 0.001). Increasing the air change rate from 0 to 5 ACH reduced the mean aerosol concentration by 34% (SD = 19%) overall, while increasing it from 0 to 12 ACH reduced the concentration by 68% (SD = 9%). Changing the cot angle also affected the concentration (p < 0.001), but the effect was more modest, especially at 5 and 12 ACH. Contrary to our expectations, the aerosol concentrations at the different worker positions were not significantly different (p < 0.556). Flow visualization experiments showed that the ventilation system created a recirculation pattern which helped disperse the aerosol particles throughout the compartment, reducing the effectiveness of the system. Our findings indicate that the ambulance ventilation system reduced but did not eliminate worker exposure to infectious aerosol particles. Aerosol exposures were not significantly different at different locations within the compartment, including locations behind and beside the patient. Improved ventilation system designs with smoother and more unidirectional airflows could provide better worker protection.

Indoor air quality-induced respiratory symptoms of a hospital staff in Iran.

The ambient air of hospitals contains a wide range of biological and chemical pollutants. Exposure to these indoor pollutants can be hazardous to the health of hospital staff. This study aims to evaluate the factors affecting indoor air quality and their effect on the respiratory health of staff members in a busy Iranian hospital. We surveyed 226 hospital staff as a case group and 222 office staff as a control group. All the subjects were asked to fill in a standard respiratory questionnaire. Pulmonary function parameters were simultaneously measured via a spirometry test. Environmental measurements of bio-aerosols, particulate matter, and volatile organic compounds in the hospital and offices were conducted. T-tests, chi-square tests, and multivariable logistic regressions were used to analyze the data. The concentration of selected air pollutants measured in the hospital wards was more than those in the administrative wards. Parameters of pulmonary functions were not statistically significant (p > 0.05) between the two groups. However, respiratory symptoms such as coughs, phlegm, phlegmatic coughs, and wheezing were more prevalent among the hospital staff. Laboratory staff members were more at risk of respiratory symptoms compared to other occupational groups in the hospital. The prevalence of sputum among nurses was significant, and the odds ratio for the presence of phlegm among nurses was 4.61 times greater than office staff (p = 0.002). The accumulation of indoor pollutants in the hospital environment revealed the failure of hospital ventilation systems. Hence, the design and implementation of an improved ventilation system in the studied hospital is recommended.

The Effects of Fasting on Toluene Metabolite (Hippuric Acid) Excretion in Urine (A Case Study of Shoe-Makers in Tambak Oso Wilangun Village-Surabaya)

Background: An increase in toluene metabolite (hippuric acid) excretion in urine can be stimulated by such factors as fasting, smoking and coffee consumption. This research aimed at studying the effects of fasting on urinary toluene excretion of shoemakers in Tambak Oso Wilangun-Surabaya. Method: This controlled case-study was conducted to 20 workers with purposive sampling method from the population. The independent variables of the study include toluene concentration, fasting or not fasting condition, smoking, and coffee consumption. The dependent variable was urinary hippuric acid concentration. Pearson Correlation test was conducted to identify the correlation between toluene concentration and hippuric acid concentration. Paired-t-test was used to compare hippuric acid concentration in fasting and non-fasting condition. The correlations between coffee consumption and smoking and hippuric acid concentration were analyzed by using chi-square test (I±=0,05). Risk assessment was used to identify the health risk from occupational toluene exposure. Result: The research showed that most of the respondents (65) were at risk to health problems related to toluene exposure (RQ>1). The statistical tests showed no significant correlation between toluene concentration and hippuric acid concentration; there was a significant difference between hippuric acid concentration before and after fasting (p=0,016; p<I±); there was a significant correlation between hippuric acid concentration (non fasting) with smoking habit (p=0,022), coffee consuming habit (p=0,025); and between hippuric acid concentration (in fasting condition) with coffee consuming (p=0,039). Conclusion: Fasting, coffee consuming and smoking habit can increase urinary hippuric acid excretion. It is recommended for future researcher to control both coffee consumption and smoking when investigating the effects of fasting to urinary hippuric acid excretion to avoid biased results. Respondents are suggested to improve ventilation system in their workshops and use chemical cartridge respirator, apron and gloves while working. © 2019, Indian Journal of Forensic Medicine and Toxicology. All rights reserved.

Investigation on the contaminant distribution with improved ventilation system in hospital isolation rooms: Effect of supply and exhaust air diffuser configurations

This study, that is practice-based learning in a real hospital construction project, has evaluated the ventilation performance of three strategies in the protection of health care workers and HVAC control for airborne infectious diseases induced by contaminated exhaled air from patients in a negative pressure isolation room. This paper examines air flow path and airborne pollutant distribution by computational fluid dynamics modeling and field measurement. In hospitals, the risk of virus diffusion mainly depends on air flow behavior and changes in direction caused by supply air and exhaust air locations. An improved isolation room ventilation strategy has been suggested, and is found to be the most efficient in removing contaminants based on the observations and simulation results from three ventilation systems. The results show that ventilation systems utilizing the “low-level extraction” technique are very effective at removing pollutants in the human breathing zone. A new clean isolation room ventilation strategy has been developed that employs two exhaust air grilles on the wall behind the bed at low floor level, coupled with a fan filter unit, and is found to have the highest pollutant removal efficiency.

Fuzzy logic-based improved ventilation system for the pharmaceutical industry

Indoor air quality in pharmaceutical industry plays a vital role in the production and storing of medicine. Stable indoor environment including favorable temperature, humidity, air flow and number of microorganisms requires consistent monitoring. This paper aimed to develop a fuzzy logic-based intelligent ventilation system to control the indoor air quality in pharmaceutical sites. Specifically, in the proposed fuzzy inference system, the ventilation system can control the air flow and quality in accordance with the indoor temperature, humidity, air flow and microorganisms in the air. The MATLAB® fuzzy logic toolbox was used to simulate the performance of the fuzzy inference system. The results show that the efficiency of the system can be improved by manipulating the input-output parameters according to the user’s demands. Compared with conventional heating, ventilation and air-conditioning (HVAC) systems, the proposed ventilation system has the additional feature of the existence of microorganisms, which is a crucial criterion of indoor air quality in pharmaceutical laboratories.

Evaluation of different training systems and crop densities to increase greenhouse tomato production and profitability in the Mediterranean area

Increasing the productivity and quality of greenhouse horticultural crops in the Mediterranean area requires the use of new structures, improved ventilation systems or an increase of radiation inside the greenhouse. This must be accompanied by the optimization of growing techniques. An example of this is how to guide the tomato plants. The usual practice in the area is to twist the plant around a supporting twine attached to the overhead wires. When the plants reach the wires, they are left to fall by gravity towards the soil. It is well known that the use of training systems for this lowering of the plants (where the plant always grows from below towards the wires) has many advantages for the crop but requires more labor and an optimization of the crop densities. In the Research Center of Cajamar “Las Palmerillas”, different systems of lowering the plants by using hangers and different crop densities have been compared for a long-cycle cultivation of tomato in greenhouse during various cropping seasons. The results showed that increasing density and using hangers enhanced the production between 10 and 34%, and the profitability of the cluster tomato crop between 16 and 48% compared to the traditional system. Also, in low-height greenhouses the use of hangers at low or medium height is recommended.

Performance analysis of ventilation systems with desiccant wheel cooling based on exergy destruction

This paper investigates the performances of ventilation systems with desiccant wheel cooling from the perspective of exergy destructions. Based on the inherent influencing factors for exergy destructions of heat and mass transfer and heat sources, provide guidelines for efficient system design. First, performances of a basic ventilation system are simulated, which is operated at high regeneration temperature and low coefficient of performance (COP). Then, exergy analysis of the basic ventilation system shows that exergy destructions mainly exist in the heat and mass transfer components and the heat source. The inherent influencing factors for the heat and mass transfer exergy destruction are heat and mass transfer capacities, which are related to over dehumidification of the desiccant wheel, and unmatched coefficients, which represent the uniformity of the temperature or humidity ratio differences fields for heat and mass transfer components. Based on these findings, two improved ventilation systems are suggested. For the first system, over dehumidification is avoided and unmatched coefficients for each component are reduced. With lower heat and mass transfer exergy destructions and lower regeneration temperature, COP and exergy efficiency of the first system are increased compared with the basic ventilation system. For the second system, a heat pump, which recovers heat from the process air to heat the regeneration air, is adopted to replace the electrical heater and cooling devices. The exergy destruction of the heat pump is considerably reduced as compared with heat source exergy destruction of the basic ventilation system and the first system, leading to a great enhancement of COP and exergy efficiency.

Enhancement of Nutrient Removal in a Hybrid Constructed Wetland Utilizing an Electric Fan Air Blower with Renewable Energy of Solar and Wind Power

The sewage treatment efficiency of hybrid constructed wetlands (CWs) was evaluated under different ventilation methods. The removal efficiencies of biochemical oxygen demand (BOD), total nitrogen (TN), and total phosphorus (TP) in the vertical flow- (VF-) horizontal flow (HF) CWs using an electric fan air blower by the renewable energy of solar and wind power were higher than those by natural ventilation, excluding only suspended solids (SS). The TN treatment efficiency in the CW using the air blower especially increased rapidly by 16.6% in comparison with the CW employing natural ventilation, since the VF bed provided suitable conditions (aerobic) for nitrification to occur. The average removal efficiencies of BOD, SS, TN, and TP in the effluent were 98.8, 97.4, 58.0, and 48.3% in the CW using an electric fan air blower, respectively. The treatment performance of the CWs under different ventilation methods was assessed, showing TN in the CW using an electric fan air blower to be reduced by 57.5~58.6% for inlet TN loading, whereas reduction by 19.0~53.3% was observed in the CW with natural ventilation. Therefore, to increase the removal of nutrients in CWs, an improved ventilation system, providing ventilation via an electric fan air blower with the renewable energy, is recommended.

燃气冷热电三联供的设备间通风系统模拟研究

燃气冷热电三联供(Combined cooling heating and Power system, CCHP)的设备间散热量大，需要合理其通风气流组织，保证设备间的温度满足设备运行最佳温度。通过实验方法确定通风方案成本过高，有必要利用模拟方式辅助设计通风系统。本文通过构建设备间三维数学模型，利用Fluent软件，对CCHP系统设备间的温度场进行数值分析，提出了气流组织形式的改进方案及相应的通风设计依据。按照改进后的通风系统，夏季在进风温度为室外设计温度307 k时，通过模拟分析利用增设冷风设备能够有效地降低发电机组运行的环境温度。冬季在进风温度设计室外温度为269.4 K时，通过模拟分析可利用自然进风和强制排风方式保证设备间的运行环境温度，可节省系统运行成本。 Heat dissipation between equipments of CCHP system, which need well organized ventilation to assure the optimum temperature for equipments running. It costs much to obtain the ventilation plan by experimental method; it is necessary to use simulation as an auxiliary for the design of ventilation system. By the building of mathematical model of equipments and using the software Fluent for numerical analysis of the temperature field between equipments, this paper gives the improvement scheme for air distribution mode and design criteria for ventilation. According to the improved ventilation system, the extra use of cold wind equipment can decrease the running temperature of power generator effectively by simulation under the condition that the inlet air temperature is equal to the design temperature 307 K of outside in summer. In winter, when the inlet air temperature is equal to the design temperature 269.4 K of outside, the use of natural air inlet and forced air exhaust can keep the running ambient temperature between equipments, which can save operation costs of the system.