CN1207518C - Fresh air controller based on people number in room - Google Patents

Abstract

The present invention relates to a fresh air controller basis of the detection of the number of indoor persons. The present invention mainly comprises the steps of input, storage, detection of the number of online persons, the determination of the set value of fresh air ventilation quantity, PID calculation and module output. According to the CO2 concentration of fresh air and return air, and the ventilation quantity of the fresh air, the actual number of the indoor persons and the change of the persons are detected in an online mode. According to minimal fresh air quantity required by ASHRAE new standards, the set value of the ventilation quantity of the fresh air is determined. According to declination of the set value and the measured value of the ventilation quantity of the current fresh air, the PID calculation is used for determining the opening degree of a fresh air valve, and therefore, the ventilation quantity of the fresh air is controlled in real time. The present invention can not only keep favorable indoor air quality, but also achieve the aim of energy saving.

Description

New trend controller based on the occupancy detection

Technical field

What the present invention relates to is a kind of new trend controller, and particularly a kind of new trend controller that detects based on occupancy that adopts belongs to architectural environment equipment and control technology field.

Background technology

In commercial establishment, air-conditioning system is to regulate the topmost approach of indoor air quality, and it utilizes treated new wind to dilute pollutant levels in (or removing) room air, thereby reaches the purpose of the indoor air quality of keeping fit.The method of utilizing new wind to improve indoor air quality is cost under many circumstances with the consumes energy, thereby considers from energy-conservation angle, under the prerequisite that guarantees certain indoor air quality, resh air requirement should be controlled at minimum.Under this requirement, with CO ₂Concentration is that DCV (Demanded-Control Ventilation) the Ventilation Control scheme of index is arisen at the historic moment.The application result of this control scheme shows that under the situation of people as room air primary pollution source, it can have certain energy-saving effect when guaranteeing indoor air quality.But, studies show that in recent years, the pollutant of inhuman generation, the i.e. pollutant that produces by construction material, pollutant by indoor decoration and furniture generation, even, the people is felt under the weather, but also may directly have influence on people's health by the pollutant that air-conditioning system itself produces.At the pollutant of indoor these inhuman generations, simply with CO ₂Be the very difficult influence of removing their of the DCV control scheme of index to room air health and comfortableness.Therefore, at the pollutant of considering inhuman generation to healthy influence, ASHRAE (U.S. heating, Refrigeration ﹠ Air-Conditioning SE) has announced a new ventilation standard-ASHRAE Standard (U.S. heating, Refrigeration ﹠ Air-Conditioning SE standard) 62-1999 1999.In this standard, the requirement of minimum fresh air requirmente is not only relevant with occupancy, but also relevant with the area of required ventilation in the building, that is:

V _{Fh, min}=V _p* P+V _B* A (1) is V wherein _pBe everyone required resh air requirement, P is an occupancy, V _BEvery square metre of resh air requirement that construction area is required, A are the area of required ventilation (air conditioning area).

New standard is no longer with the unique requirement of people as resh air requirement, even under indoor unmanned situation, it also requires a basic resh air requirement, wish to make indoor by construction material, the pollutant of furniture or other inhuman generation can keep lower concentration, to guarantee healthy comfortable IAQ.At this requirement, with CO ₂Concentration is that the DCV control scheme of index is difficult to satisfy, and should design suitable control method to adapt to and to satisfy the requirement of new standard.

Summary of the invention:

Be deficiency and the defective that overcomes prior art, the present invention adopts based on indoor and outdoor CO ₂The measurement of concentration, effective strength in the online sensing chamber and variation thereof then according to the number and the draught area of indoor reality, determine to meet the minimum fresh air ventilation of ASHRAE new standard 62-1999.

The present invention's " based on new trend controller of occupancy detection " comprises storage, and online number detects, and new wind ventilation sets value modules such as definite and PID (ratio, integration, differential) computing.Online number detection module promptly is real-time number detection module.

Input module is gathered the new wind and the return air CO of current time ₂The measured value of concentration and new wind ventilation, and it is sent into memory module preserve, memory module is with current time and last new wind and return air CO constantly ₂The measured value of concentration and new wind ventilation is sent into real-time number detection module, and the number detection module is according to current time and last new wind ventilation ν constantly in real time _Fh ⁱAnd ν _Fh ^I-1, current time and last return air CO constantly ₂Concentration C _Rtn ⁱWith _Crtn ^I-1, and the new wind CO of current time ₂Concentration C _Fh ⁱCalculate the occupancy P of current time ⁱ:

$P^i=\frac{(v_{\mathrm{fh}}^i+v_{\mathrm{fh}}^{i-1})}{2S}\×(C_{\mathrm{rtn}}^i-C_{\mathrm{fh}}^i)+V\×\frac{C_{\mathrm{rtn}}^i-C_{\mathrm{rtn}}^{i-1}}{\mathrm{S\Δt}}---\left(2\right)$

V is the volume of air conditioning area in the formula, and S is everyone CO ₂Emission index, Δ t is the time between the double sampling.

The current occupancy that real-time number detection module will calculate is sent into new wind ventilation setting value determination module, new wind ventilation setting value determination module is according to current occupancy and draught area A, according to the requirement (equation 1) of ASHRAE new standard, determine the setting value ν of new wind ventilation _{Fh, set}

New wind ventilation setting value after determining is admitted to the PID computing module, the PID computing module calculates control instruction according to the measured value of this setting value and current new wind ventilation, and it is sent into output module, output module is exported to actuator with control instruction again, to control new wind air-valve.

Employing is controlled the new wind of air-conditioning system based on the new trend controller that occupancy detects, and can satisfy the requirement of ASHRAE new standard, and it not only can keep good indoor air quality, can reach purpose of energy saving again.

Description of drawings

Fig. 1 is the logical construction schematic diagram of controller of the present invention.

Among the figure, 1-input module, 2-memory module, 3-online number detection module, 4-new wind ventilation setting value determination module, 5-PID computing module, 6-output module.

The specific embodiment

Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.

As shown in Figure 1, the present invention includes input module 1, memory module 2, number detection module 3, newly wind ventilation setting value determination module 4, PID computing module 5 and output module 6 in real time.

Input module 1 is electrically connected with memory module 2, memory module 2 is electrically connected with real-time number detection module 3, new wind ventilation setting value determination module 4 and PID computing module 5 respectively, number detection module 3 is electrically connected with new wind ventilation setting value determination module 4 in real time, new wind ventilation setting value determination module 4 is electrically connected with PID computing module 5, and PID computing module 5 is electrically connected with output module 6.

Input module 1 is gathered the new wind and the return air CO of current time ₂The measured value of concentration and new wind ventilation, and it is sent into memory module 2 preserve, memory module 2 is with current time and last new wind and return air CO constantly ₂The measured value of concentration and new wind ventilation is sent into real-time number detection module 3, and number detection module 3 is according to current time and last new wind ventilation, current time and last return air CO constantly constantly in real time ₂The new wind CO of concentration and current time ₂Concentration, calculate the occupancy of current time, the current occupancy that real-time number detection module 3 will calculate is sent into new wind ventilation setting value determination module 4, new wind ventilation setting value determination module 4 is according to the draught area of preserving in current occupancy and the memory module 2, requirement according to the ASHRAE new standard, determine the setting value of new wind ventilation, new wind ventilation setting value after determining is admitted to PID computing module 5, PID computing module 5 calculates control instruction according to the measured value of the current new wind ventilation of preserving in this setting value and the memory module 2, and it is sent into output module 6, output module 6 is exported to actuator with control instruction again, to control new wind air-valve.

Claims (1)

1. new trend controller that detects based on occupancy, comprise input module (1), memory module (2), real-time number detection module (3), new wind ventilation setting value determination module (4), PID computing module (5) and output module (6), it is characterized in that, input module (1) is electrically connected with memory module (2), memory module (2) respectively with real-time number detection module (3), new wind ventilation setting value determination module (4) and PID computing module (5) are electrically connected, number detection module (3) is electrically connected with new wind ventilation setting value determination module (4) in real time, new wind ventilation setting value determination module (4) is electrically connected with PID computing module (5), PID computing module (5) is electrically connected with output module (6), and input module (1) is gathered the new wind and the return air CO of current time ₂The measured value of concentration and new wind ventilation, and it is sent into memory module (2) preserve, memory module (2) is with current time and last new wind and return air CO constantly ₂The measured value of concentration and new wind ventilation is sent into real-time number detection module (3), and number detection module (3) is according to current time and last new wind ventilation v constantly in real time _Fh ⁱAnd v _Fh ^I-1, current time and last return air CO constantly ₂Concentration C _Rtn ⁱAnd C _Rtn ^I-1, and the new wind CO of current time ₂Concentration C _Fh ⁱCalculate the occupancy P of current time ⁱ:

$P^i=\frac{\left(v_{\mathrm{fh}}^i{+v}_{\mathrm{fh}}^{i-1}\right)}{2S}\×(C_{\mathrm{rtn}}^i-{C^i}_{\mathrm{fh}})+V\×\frac{C_{\mathrm{rtn}}^i-C_{\mathrm{rtn}}^{i-1}}{\mathrm{S\Δt}}$

V is the volume of air conditioning area in the formula, and S is everyone CO ₂Emission index, Δ t is the time between the double sampling, the current occupancy that real-time number detection module (3) will calculate is sent into new wind ventilation setting value determination module (4), new wind ventilation setting value determination module (4) is according to current occupancy and draught area A, according to the requirement of ASHRAE new standard, determine the setting value v of new wind ventilation _{Fh, set}New wind ventilation setting value after determining is admitted to PID computing module (5), PID computing module (5) calculates control instruction according to the measured value of this setting value and current new wind ventilation, and it is sent into output module (6), output module (6) is exported to actuator with control instruction again, to control new wind air-valve.