Modern solutions to improve the efficiency of air treatment in HVAC Systems

Some Aspects of Improving the Efficiency of Air Treatment in the Contact Units of HVAC Systems

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.258 ◽

2017 ◽

Author(s):

Alexander Gvozdkov ◽

Olga Suslova

Keyword(s):

Energy Efficient ◽

Experimental Studies ◽

Water System ◽

Hvac Systems ◽

Moisture Exchange ◽

Air Treatment ◽

Working Space ◽

Transition Area ◽

Criterial Equations ◽

Heat And Moisture

One of the main issues of improving the efficiency of air treatment in ventilation and air conditioning systems (HVAC systems) is development of methodology for the realization of energy-efficient air treatment processes in the contacting units. This paper investigates the thermodynamic models of “air-water” system, considering some features of the transition area at the interface, including surface phases and boundary layers of air and water. It has a great impact on the efficiency of processes of heat and moisture exchange in the contact units HVAC systems. The paper presents the results of experimental studies to determine the air-water interfaces temperature when achieving a state of thermodynamic balance condition in contacting media (air and water) in the working space of contact units. It was found that the surface temperature is determined by state of the surface phase and depends on the direction process of heat and moisture exchange (condensation or evaporation). The temperature factor k = Tdry/Ts as a criterion for determining the effect of the state transition area on the processes of heat and moisture exchange, was used. Processing of results from experimental researches in the processes of heat and mass transfer is presented in the form of criterial equations for Nu, Nu. Results of the performed research are the basis for the formulation of theoretical ideas about the energy efficient processes and the development of a new method for calculation of the contact units HVAC systems.

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Software for the Design of Swimming Pool Dehumidifiers Units

Selected Scientific Papers - Journal of Civil Engineering ◽

10.2478/sspjce-2013-0004 ◽

2013 ◽

Vol 8 (1) ◽

pp. 35-42 ◽

Cited By ~ 1

Author(s):

Aleš Rubina ◽

Petr Blasinski ◽

Zdeněk Tesař

Keyword(s):

Energy Consumption ◽

Hvac Systems ◽

Swimming Pool ◽

Design Parameters ◽

Air Treatment ◽

Air Handling Units ◽

Indoor Swimming Pool ◽

Calculation Module ◽

Physical Changes ◽

Physical Phenomena

Abstract The article deals with the description and solution of physical phenomena taking place during evaporation of water. The topicality of the theme is given a number of built indoor swimming pool and wellness centers at present. In addressing HVAC systems serving these areas, it is necessary to know the various design parameters in the interior including the water temperature as the pool temperature and humidity. Following is a description of the calculation module, air handling units, including optimizing the settings of the physical changes in order to ensure the lowest energy consumption for air treatment and required maintaining internal microclimate parameters.

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Feasibility Study on the In-Service Testing Program Plan for Safety-Related Dampers of Advanced Power Reactor-1400

Journal of Nuclear Engineering and Radiation Science ◽

10.1115/1.4050094 ◽

2021 ◽

Vol 7 (3) ◽

Author(s):

Shincheul Kang ◽

Chan Park ◽

Kyungho Lee ◽

Sungho Lee

Keyword(s):

Air Conditioning ◽

Nuclear Power ◽

Power Plants ◽

Power Reactor ◽

Selection Process ◽

Hvac Systems ◽

Air Treatment ◽

Service Testing ◽

Operation And Maintenance ◽

Program Plan

Abstract In-service testing (IST) program including test and examination has been emphasized to assess the operability of the safety-related components in nuclear power plants. Since the issuance of ASME N511 in 2007 concerning IST for air treatment, heating, ventilating, and air conditioning (HVAC) systems, the IST program plan for those systems should be needed to establish prior to setting up the detailed program. The proper plan can contribute to enhance the effectiveness of allotment of the resources inevitable for implementation of the program and ultimately save operation and maintenance costs. In order to achieve the purposes, this paper presents the methodologies to establish IST program plan for safety-related dampers including their selection process of the dampers to be included in the program and representative template made by applying the methodologies. In addition, the method to identify testing types per damper for part of selected dampers is also provided in this paper.

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