The whole process of HVAC system design
Specializing in manufacturing central air conditioningng, HV AC industrial air conditioning, industrial dehumidifier, industrial wheel air conditioning,rooftop package unit ,AHU ,etc.
The basic design steps and main design procedures of air conditioning system design can be summarized as follows
Step 1: be familiar with the original design data of the design building
Including: documents provided by the construction party, building use and process requirements, design specification, building operation drawing, etc.
Step 2: data research
Including: consulting relevant design materials (manuals, specifications, standards, measures, etc.), collecting products of relevant equipment and materials.
Step 3: determine indoor and outdoor design meteorological parameters
According to the area where the design building is located, the design parameters of outdoor air in winter and summer are checked; according to the use function of the design building, the design parameters of indoor air in winter and summer are determined.
Step 4: determine the building thermal parameters and other parameters of the design building
According to the composition of the peripheral protective structure of the building, calculate the heat transfer coefficient and other parameters of the external wall, roof, external door and external window; according to the composition of the internal and external protective structure of the building, calculate the heat transfer coefficient and other parameters of the internal wall, floor, external door and external window; according to the use function of the building, determine the number of people in the room, lighting load, equipment load, working time period and other parameters.
Step 5: Calculation of heat and humidity load of air conditioner
Calculate the air conditioning heat and humidity load (residual heat and humidity) of the design building under the most unfavorable conditions; compare the building energy-saving schemes to determine the reasonable air conditioning heat and humidity load. Step 6: determine the best air conditioning scheme through technical and economic comparison, select and determine the air conditioning system mode, cold and heat source mode, and air conditioning system control mode suitable for the designed building.
Step 7: Calculation of air supply volume and air distribution
According to the calculated air conditioning heat and humidity load and air supply temperature difference, determine the air supply state and air supply volume in winter and summer; according to the working environment requirements of the design building, calculate and determine the minimum fresh air volume; according to the air conditioning mode and the calculated air supply and return volume, determine the air supply and return outlet forms, arrange the air supply and return outlets, and carry out the air distribution design.
Step 8: air conditioning water and air system design
Arrange air conditioning air duct, carry out hydraulic calculation of air duct system, determine pipe diameter, resistance, etc.; arrange air conditioning water duct, carry out hydraulic calculation of water pipeline system, determine pipe diameter, resistance, etc.
Step 9: design and selection of main air conditioning equipment
According to the air treatment scheme of the air conditioning system, combined with the I-D diagram, the selection design and calculation of the air conditioning equipment are carried out; the capacity (heat load) and air supply volume of the air treatment equipment are determined, the structure form and thermal parameters of the surface heat exchanger are determined; the flow, air pressure and model of the fan are determined according to the hydraulic calculation of the air duct system.
Step 10: Design of smoke control and exhaust system
Step 11: cold and heat source machine room design
According to the capacity of air treatment equipment, determine the capacity and model of cold source (refrigerator) or heat source (boiler); according to the hydraulic calculation of pipeline system, determine the flow, head and model of water pump.
Step 12: cold insulation, heat preservation, noise reduction and vibration isolation design of air conditioning equipment and its pipes
Step 13: engineering drawing drawing, arrangement design and calculation instruction air conditioning heat and humidity load calculation
Air conditioning load can be divided into two types: air conditioning room or area load and system load: air conditioning room or area load is the load that occurs directly in the air conditioning room or area; in addition, there are some loads that occur outside the air conditioning room or area, such as the load of fresh air (the load caused by the difference between the state of fresh air and the state of indoor air) Pipeline temperature rise (drop) load (load caused by heat transfer of air pipe or water pipe), fan temperature rise load (temperature rise after air passes through the ventilator), water pump temperature rise load (temperature rise after liquid passes through the water pump), etc. these loads do not directly affect the room, but they are ultimately borne by the air conditioning system. It is called system load to combine the above loads that directly occur in the air-conditioned room or area with the additional loads that do not directly act on the air-conditioned room or area.
Generally, the air supply volume or air supply parameters of the air conditioning system are determined according to the heat and humidity load of the air conditioning room or area; air processing equipment such as fan coil unit, fresh air unit, air processor, and cold and heat source equipment such as refrigerator and boiler are selected according to the system load. Therefore, the first step of designing an air-conditioning system is to calculate the heat and humidity load of the air-conditioned room or area.