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CADR measurement method of air exchange rate in room

A technology of the number of air changes and the measurement method, which is applied in measurement devices, complex mathematical operations, analysis of suspensions and porous materials, etc. The effect of application, short experiment period and strong operability

Inactive Publication Date: 2019-10-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the carbon dioxide concentration decay method stipulates that there should be no carbon dioxide release sources in the measurement room during the measurement process, or only release sources with low intensity and stable release rate are allowed to ensure that the carbon dioxide concentration in the room shows a steady downward trend during the measurement period.
The human body as a natural carbon dioxide release source obviously does not meet this requirement, so the carbon dioxide drop method needs to ensure that no people move or stay in the room during the measurement process, otherwise it will have a great impact on the experimental results
This has strict requirements and restrictions on the measurement time and place of the ventilation rate, which brings a lot of inconvenience to the measurement work.

Method used

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  • CADR measurement method of air exchange rate in room
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  • CADR measurement method of air exchange rate in room

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 1 and figure 2 As shown, the air purifier is placed in the measured room, so that the indoor PM 2.5 The concentration changes hourly. A college classroom is selected as the test site for the ventilation rate. The classroom is located on the 4th floor of a 5-story building, and the volume of the classroom is 148m 3 , there is a fan on the top of the measurement room that can make the air in the room evenly mixed, the room is not airtight, there are doors for personnel to enter and exit and windows for ventilation, and the air purifier is placed in the middle of the room; PM 2.5 Concentration measurement using ELPM 2.5 -100 real-time online PM 2.5 monitor, indoor PM 2.5 The concentration real-time monitor is placed on the table in the middle of the room, and the outdoor PM 2.5 The concentration real-time monitor is placed on the window sill outside the window; the analysis and processing of the data uses the EXCEL worksheet.

[0036] The key parameter de...

Embodiment 2

[0046] see figure 1 and image 3 , in this embodiment, select a certain university classroom as the test site of the ventilation rate, this classroom is located at the fifth floor of a certain five-story building, and the volume of the classroom is 147m 3 , there is a fan on the top of the measurement room that can make the air in the room evenly mixed, the room is not airtight, there are doors for personnel to enter and exit and windows for ventilation, and the air purifier is placed in the middle of the room; PM 2.5 Concentration measurement using PM 2.5 concentration real-time monitor, the PM 2.5 The concentration real-time monitor is Tsingda Jianhuan QD-M1, indoor PM 2.5 The concentration real-time monitor is placed on the table in the middle of the room, and the outdoor PM 2.5 The concentration real-time monitor is placed on the window sill outside the window; the analysis and processing of the data uses the EXCEL worksheet.

[0047] Required parameter determination ...

Embodiment 3

[0057] see figure 1 and Figure 4 , in this embodiment, select certain university classroom as the test site of ventilation rate, this classroom is located at the fifth floor position of certain five-storey building, and classroom volume is 63m 3 , the measurement diagram is as figure 1 As shown, there is a fan on the top of the measurement room that can make the air in the room evenly mixed, the room is not airtight, there are doors for personnel to enter and exit and windows for ventilation, and the air purifier is placed in the middle of the room; PM 2.5 Concentration measurement using PM 2.5 Concentration real-time monitor, the PM2.5 concentration real-time monitor is Qingda Jianhuan QD-M1, indoor PM 2.5 The concentration real-time monitor is placed on the table in the middle of the room, and the outdoor PM 2.5 The concentration real-time monitor is placed on the window sill outside the window, and the analysis and processing of the data uses the EXCEL worksheet;

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Abstract

The invention provides a CADR measurement method of an air exchange rate in a room and belongs to the building indoor environment detection technology field. The technical scheme is characterized by taking PM2.5 which naturally exists in the air as a tracer substance; when an air purifier is in the room, according to actually-measured data of indoor and outdoor PM2.5 concentrations at different moments, carrying out iterative fitting on the actually-measured data based on a physical model established according to a mass balance principle; and calculating and determining the air exchange rate in the room. The method has advantages that the PM2.5 which naturally exists in the air is taken as the tracer substance; when the air purifier is in the room, according to the actually-measured data of the indoor and outdoor PM2.5 concentrations, iterative fitting is performed on the actually-measured data based on the physical model established according to the mass balance equation; and then, the method for measuring the air exchange rate in the room is obtained.

Description

technical field [0001] The invention relates to the technical field of building indoor environment detection, in particular to a CADR measurement method for room ventilation times. Background technique [0002] With the rapid development of the world economy, people have higher and higher requirements for air quality in the living environment. The air change rate has a great impact on both indoor environmental quality (IEQ) and building energy consumption. Ventilating a room with outside air removes moisture and pollutants emitted indoors, so building rooms typically require sufficiently high air change rates to avoid compromising the IEQ and causing occupant health, reduced indoor environmental comfort, absenteeism and reduced productivity And other issues. Judging from the current proportion of global energy consumption, buildings are an important source of energy consumption and a major source of greenhouse gas emissions, while heating, ventilation and air conditioning ...

Claims

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Application Information

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IPC IPC(8): G01N15/06G06F17/10
CPCG01N15/06G06F17/10
Inventor 季思宇刘聪
Owner SOUTHEAST UNIV
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