Air Conditioner for Shallow Circular Silos

The equipment features a step-by-step temperature reduction function and is equipped with a precise temperature sensor to prevent rapid temperature reduction from causing changes in the stability of stored grain conditions and deterioration of stored grain quality.The specific method is as follows:

1)The overall design of the dedicated air conditioning system for grain storage adopts a design concept featuring high air volume(supply air distance≥20 meters)and low temperature difference,ensuring no or minimal condensation under most operating conditions,thereby reducing the amount of condensation and subsequently minimizing the moisture loss of grains;

2)The heat exchanger adopts an evaporator with large-area enhanced heat transfer,optimizing the utilization coefficient and heat transfer efficiency of the evaporator area,increasing the evaporation temperature,thereby reducing condensed water and minimizing moisture loss in grain;

3)A pressure regulating valve is installed on the air conditioning refrigerant pipeline.During operation,by adjusting the evaporation pressure,the evaporation temperature is effectively controlled,ensuring that the difference between the evaporation temperature and the temperature inside the grain storage is always above the dew condensation threshold.This prevents dew condensation during air conditioning operation,and long-term use in grain storage can achieve the effect of maintaining water retention and quality of the grain pile;

4)In terms of fan selection,a high-wind-speed outlet is adopted,which enhances the disturbance area,making the air conditioning return air closer to the temperature of the storage bin.This avoids excessive condensation caused by excessively low return air temperature,thereby reducing the loss of grain moisture;

Based on the above design,the annual average discharge of condensed water outside the storage facility is not more than 1kg per ton of grain,and the moisture reduction of the grain is≤0.1%per year.

1)The evaporator is one that is not prone to chemical reaction with PH3 gas.The sheet metal parts are made of 304 stainless steel(with Ni content greater than 8%and Cr content greater than 18%).The evaporator is treated with a fully immersed metal nano-water-based anti-corrosion coating,with a coating thickness of about 10um.This metal nano-coating thickness has little impact on the heat exchange performance of the heat exchanger.Our company has obtained a test report on the resistance of the evaporator to phosphine fumigation corrosion issued by the Zhengzhou Grain Storage Machinery Quality Supervision and Inspection Center of the National Grain Administration.Under conditions of phosphine concentration above 350ml/m3,the sample remains intact after being sealed for 21 days and fumigated.2)The control circuit,air supply fan,and sensor use enclosed circuits that are isolated from the ambient gas,as well as motors.3)Through program control,the start and stop time of the fan is controlled;the internal dry environment of the evaporator is maintained as much as possible,thereby avoiding or reducing the corrosive properties of phosphine.

The air conditioning duct of the shallow silo is equipped with an airtight butterfly valve,which can prevent phosphine gas from entering the interior of the equipment during fumigation.

1)The evaporator adopts a fully immersed treatment with a metal nano-coating and has obtained a fumigation-proof testing report.2)The control circuit,blower,and sensor use a closed circuit that is isolated from the ambient gas,and the motor is also sealed.3)The evaporation chamber of the unit is a closed box structure,fully welded and formed using 304 stainless steel.The connecting parts use flanges and sealing gaskets,providing good air tightness and ensuring normal equipment operation during fumigation operations.A gas tightness testing report issued by a testing institution recognized by the China National Accreditation Service for Conformity Assessment(CNAS)has been obtained.The half-life of gas tightness under a pressure of 1000Pa is 1.5 hours.

The evaporation chamber of the unit is a sealed box-type structure,fully welded and formed using 304 stainless steel.The connecting parts are equipped with flanges and sealing gaskets,ensuring good air tightness and meeting the normal use of equipment during fumigation and controlled atmosphere operations.A gas tightness test report issued by a testing organization recognized by the China National Accreditation Service for Conformity Assessment(CNAS)has been obtained.The half-life of gas tightness under a pressure of 1000Pa is 1.5 hours.Actual usage locations include:Central Grain Reserve Yancheng Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Yichang Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Huanggang Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Jingzhou Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Xincai Directly Affiliated Warehouse Co.,Ltd.,Huizhou Grain Reserve Directly Affiliated Warehouse,Guangdong Provincial Grain Reserve Changping Grain Depot,Central Grain Reserve Beihai Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Jiangmen Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Huizhou Directly Affiliated Warehouse Co.,Ltd.,and Central Grain Reserve Zhaoqing Directly Affiliated Warehouse Co.,Ltd.

The equipment features a step-by-step temperature reduction function and is equipped with a precise temperature sensor to prevent rapid temperature reduction from causing changes in the stability of stored grain conditions and deterioration of stored grain quality.The specific methods are as follows:1)The dedicated air conditioning system for grain storage adopts a design concept of high air volume(air supply distance≥20 meters)and low temperature difference at the overall design level,ensuring no condensation water or minimal condensation water under most operating conditions,reducing the amount of condensation water,and thus reducing the loss of grain moisture;2)The heat exchanger adopts a large-area enhanced heat exchange evaporator,optimizing the utilization factor and heat exchange efficiency of the evaporator area,increasing the evaporation temperature,thereby reducing condensation water and minimizing the loss of grain moisture;3)A pressure regulating valve is installed on the air conditioning refrigerant pipeline,effectively controlling the evaporation temperature by adjusting the evaporation pressure during operation,so that the difference between the evaporation temperature and the warehouse temperature is always higher than the dew point,achieving no condensation during air conditioning operation,and ensuring long-term use of the grain storage warehouse can achieve the effect of maintaining water and quality retention in the grain pile;4)In terms of fan selection,a high wind speed outlet is adopted,enhancing the disturbance area,making the air conditioning return air closer to the warehouse temperature,avoiding excessive condensation caused by too low return air temperature,thereby reducing the loss of grain moisture;5)The control system is optimized to improve the compatibility and efficiency of the entire system,ensuring uniform warehouse temperature,avoiding excessive condensation water caused by excessive temperature and temperature difference,and effectively reducing the loss of grain moisture.Through the above design,the annual average external condensation water discharge is not more than 1kg/ton of grain,and the reduction in grain moisture is≤0.1%/year.Actual usage locations include:Central Grain Reserve Daye Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Huanggang Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Xiantao Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Nanyang Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Xinyang Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Huangchuan Directly Affiliated Warehouse Co.,Ltd.,Central Grain Reserve Shangqiu Directly Affiliated Warehouse Co.,Ltd.,Zhejiang Tongqu Grain Storage Co.,Ltd.,Huilai County Grain Reserve Management Corporation,Jiujiang Xundong Grain and Oil Storage Co.,Ltd.,Shanghai Liangyou Logistics Group Co.,Ltd.,Maoming Dianbai District Grain Collection and Storage Co.,Ltd.,Beijing Baoyi Grain and Oil Reserve Co.,Ltd.,Beijing Nanjiao Grain Collection and Storage Co.,Ltd.,etc.

1)The evaporator and heat exchanger adopt a large fin spacing and utilize high-volume fans to start and remove dust,effectively preventing dust blockage.2)The evaporator is customized with a nested filter screen structure,facilitating easy cleaning and maintenance.During cleaning,simply open the lock latch of the filter screen,pull it out,and blow it clean.The operation is convenient and quick.3)The air supply section is designed with an automatic recovery dust alarm.It also prevents frosting on the evaporator caused by reduced air volume due to dust blockage or other reasons,and features an automatic recovery dust and frost prevention alarm.4)The condenser is customized with an easily removable filter screen.Simply pull out the filter screen and blow it clean.The operation is convenient and quick.5)Condensate water spraying can reduce dust adhesion on the condenser fins.

1)The equipment features local control,mobile app control,and remote host computer control functions(providing free communication interfaces and protocols for integration with intelligent control systems).2)Monitoring items:supply air temperature,return air temperature,supply air humidity,return air humidity,supply air frequency,display of unit operating status,etc.3)Control items:temperature setting,humidity setting,operation control time setting,equipment start/stop.4)Protection items:power phase loss/phase absence/phase mismatch protection,high/low voltage protection,compressor/condenser fan/supply fan overcurrent protection,system high voltage overprotection,system low voltage underprotection,voice reminders for start/stop,emergency stop.5)4-year free data usage:the air conditioner comes with a 4-year data card

1)Long warranty period:4-year warranty.2)Provide installation guidance and training services,ensuring that the trained employees can independently manage,operate,and maintain the equipment within the specified time after training,guaranteeing normal and continuous use.3)During the warranty period,if there are any quality issues with the product itself,our company will arrange after-sales service personnel to provide free services such as repair and replacement of parts.All expenses incurred will be borne by our side.4)Outside the warranty period,we will provide maintenance services for the equipment,charging only for the cost of spare parts.5)Both inside and outside the warranty period,our company will conduct regular inspection and maintenance services for the equipment.6)Our company provides lifelong supply of spare parts and accessories for the equipment.7)Response time:For general issues,we provide telephone support within 24 hours;for difficult and key issues,we resolve them on-site within 1 day.

1)Discount for bundled purchasing(discount percentage for future bundled purchasing of products of the same specification and category):Our company promises that if the purchaser conducts future bundled purchasing of products of the same specification and category,a 2%price discount will be applied based on this offer.2)Feasibility of universal replacement of parts(list of vulnerable parts and replacement plans):All parts are sourced from well-known domestic and international brands and are of universal models,ensuring a stable supply of original genuine parts throughout the equipment's lifespan.Even if the original brand discontinues production,our company's spare parts inventory is sufficient(or we can find alternative models of the brand's products)to ensure normal use of the equipment.3)Support for spare parts:Our company promises to provide free replacement of wear-and-tear materials necessary for maintenance after the warranty period.