Research On Adjust To Operational Air Conditioning System With Mutative Occupant Density At The Mall

The occupant density in shopping malls is intensive and fluctuant,have a greater impact on air conditioning system Load.In the air conditioning operation process,the occupant density as an indicator in a timely manner to control the regulation of air conditioning system water temperature,flow rate and other operating parameters to adapt to changes in air conditioning load,saving air conditioning system energy consumption.The influencing factors of occupant of mall are complicated,the situation of the number of changes can't be summarized by a specific law,and can't be accurately predicted.Based on the field survey data.This paper takes the air conditioning system in the common areas of the mall as example to analyze the operation regulation of the air conditioning system when the occupant density changes.The survey of a shopping mall in Guangzhou.Statistics on the number of staff in each region of mall during the business hours and analysis the law of changes of occupant.The survey found that in the mall business hours,it's obvious that the regularity of the number of personnel peak and emergence.The number of occupant in addition to the differences in time,the distribution of different regions are also different,different types of store staff changes in different curves.Statistics on the number of occupant in common areas found that the first floor and the ground floor as the transport hub,the occupant density of about 1.5 times the other floors,while the weekend occupant density of about 1.5 times the working day.Now the shopping malls pay more attention to customer experience,compared to the last century,is a greater increase in mall,increased 1m2/person to 8~9m2/person.Restaurants and cafes which people are intensive,occupant density is only 2.2 m2/person.Reference to the US standard ASHRAE Standard 62.1,shopping malls in all regions of the normal fresh air recommended indicators for the 25~35 [m3 /(h · person)],the fresh air volume indicators are different.Taking the mall common area as an example,the meteorological parameters of the local standard year as the calculation condition,according to the actual building structure,analysis of hourly conditioning load with “single peak” and “bimodal peak” two different changes curve in May to October.The cold load caused by person accounted for the largest proportion of indoor load of nearly 40%,while the sum of personnel load and fresh air load in the air condition system,the maximum proportion of up to 60%.The change in the number of personnel has a great impact on the air conditioning load.Taking the mall air conditioning system as an example,according to the calculation result of the load,the computer process is used to calculate the air handing process for each condition.Analysis of the parameters of the air supply and occupant changes in the law,the volume of air supply is mainly affected by the impact of outdoor air.Although the increase in occupant will increase the air conditioning load,the reduced heat and humidity ratio of the indoor load increases the air supply temperature difference,so that the air volume did not change obvious.Occupant affect the air temperature changes,the higher supply air temperature caused by the fewer number of occupant.Compared with the number of occupant,to occupant density as an indicator,the system operation regulation has greater versatility.Assuming that real-time meteorological parameters and occupant number compensation control are available,the relationship between the operating parameter adjustment and the occupant density correction is calculated by referring to the occupant curve.Taking the air supply temperature as an example,the “standard” curve is used as the reference curve,and the adjustment ratio of the two different personnel curves is only 6%~16%,which is more suitable for the mutative occupant number.In the control mode of constant water temperature,the higher controlled temperature resulting in greater the flow rate adjustment.In the control mode of the constant flow rate,the greater controlled flow rate resulting in smaller the water temperature adjustment.The results show that there are obvious quantitative relations based on the change curve of the reference occupant and the adjustment amount of the operating parameters of the system according to the correction of the density of the occupant.There is a certain practical significance.