In the whole life cycle of HVAC system, scheme design is the most critical link, which determines the stability and feasibility of the follow-up work of the system. This paper mainly discusses the HVAC design of high-rise buildings. First of all, the connotation of heating, ventilation, air conditioning and the concept of HVAC are described. Make preparations before design, summarize some suggestions to improve the economy and applicability of HVAC design scheme, and put forward some precautions. The following small edition will introduce the laboratory design requirements of HVAC system.
1. Connotation of heating, ventilation and air conditioning
The so-called heating is heating, which means that buildings provide heat, improve indoor temperature and maintain; ventilation refers to the introduction of outdoor fresh air and fresh air into the room, and the replacement of indoor air in the building, so as to improve indoor air quality; while air conditioning is to control and regulate the temperature and humidity of a certain space in the building, the cleanliness and air flow speed of the air, that is, our daily Regular air conditioning. Air conditioning system can fully control the humid and hot environment and air quality of the building. It includes some heating and ventilation functions, and HVAC is an abbreviation combining these three air conditioning requirements.
2. Work content before HVAC design
In order to ensure the follow-up effect of HVAC before making the design scheme, some work before the design scheme can not be ignored to ensure the applicability, economy and aesthetics of the design scheme. Generally speaking, the work before the scheme design mainly includes the following points:
First, understand the specific location of high-rise buildings in the general plan of the project, determine the layout of adjacent buildings and surrounding heating, water supply and power supply pipelines, and analyze the possible interface points. Its main purpose is to provide objective conditions for the heating entrance of HVAC design. In the process of load calculation, selecting wind, sunshine and other parameters can also be used as a reference, and combining the direction of the main entrance can determine the practice of the door.
Secondly, understand the number of people in the building under normal conditions, the use time of HVAC system, etc., and know whether there will be exhaust emissions, so as to provide reference for load calculation and system division.
Third, the number of floors, storey height and total height of high-rise buildings are for detailed understanding of the whole building. For high-rise buildings with a building height of more than 24 meters, the design scheme should also refer to the relevant code content of high-rise building fire.
Fourth, divide the fire zone and smoke exhaust zone, determine the specific location of the firewall and fire evacuation route, its main role is to provide reference for the follow-up smoke control system design, and determine the location of the fire damper.
Fully understand the structural scheme of the building, determine the position of the shear wall, and respectively understand the specific practices of the roof and the external wall.
Sixth, select the construction location of the air conditioning room and the location of the cooling tower to further clarify the location of key points such as power supply, instrument room, water pump room and heat source.
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