Combined air conditioning unit selection: Calculate air conditioning load

In modern architectural design,Combined ac unit as a key device for regulating the indoor air environment, its selection is directly related to the comfort, energy efficiency and operating costs of the building. Among them, the calculation of air conditioning load is the core link in the selection process. It needs to comprehensively consider multiple factors such as the purpose, area, height, and personnel density of the building to ensure that the selected unit can meet actual needs and achieve efficient and stable operation. Air treatment effect.

1. The importance of air conditioning load calculation

Air conditioning load, simply put, refers to the amount of heat and humidity that the air conditioning system needs to handle in order to maintain the indoor set temperature, humidity and air quality. Accurate calculation of air conditioning load is crucial to determine the basic specifications and performance requirements of combined air conditioning units and even the design and operation of the entire air conditioning system. Too high a load estimate will lead to oversizing of equipment, resulting in unnecessary waste of investment and energy consumption; while too low a load estimate may cause the equipment to be unable to meet actual demand, affect the comfort of the indoor environment, and even shorten the service life of the equipment. .

2. Key factors affecting air conditioning load

1. Building use: Buildings with different uses, such as office buildings, hospitals, shopping malls, etc., have different internal heat source intensity, personnel activity density and demand for fresh air, which directly affects the size of the air conditioning load.

2. Area and height: The total area and height of the building determine the total volume of air treatment, which in turn affects the processing capacity requirements of the air conditioning system.

3. People density: Areas with high people density, such as conference rooms, classrooms, etc., will significantly increase the air conditioning load due to the heat and humidity emitted by the human body.

4. External environmental conditions: including geographical location, climate type, solar radiation intensity, etc., these factors determine the amount of heat transferred into or out of the building through the building envelope.

5. Internal heat sources: heat generated by lighting equipment, office equipment, kitchen equipment, etc. is also an important part of the air conditioning load.

3. Method for calculating air conditioning load

Air conditioning load calculation is usually divided into two parts: cooling load and heating load, which can be accurately calculated through professional software, such as using the method recommended by ASHRAE (American Society of HVAC Engineers) or software such as PKPM developed by the China Academy of Building Research. During the calculation process, specific parameters of the building need to be input, including building structure, material properties, personnel density, equipment power, etc. The software will automatically calculate the cooling and heating loads based on these inputs.

4. Unit selection based on air conditioning load

After completing the air conditioning load calculation, the selection of combined air conditioning units can be started based on the obtained data. When selecting a model, in addition to considering load matching, you also need to pay attention to factors such as the energy efficiency ratio, noise level, maintenance convenience, and brand reputation of the unit. Specifically:

• Energy efficiency ratio: Choosing a unit with a high energy efficiency ratio can help reduce long-term operating costs.

• Noise level: Especially in places such as hospitals and schools that require a quiet environment, low-noise units are particularly important.

• Maintenance convenience: Easy-to-maintain units reduce downtime and repair costs.

• Brand reputation: Choose well-known brands to ensure product quality and service reliability.

The correct selection of combined air conditioning units is inseparable from the accurate calculation of the air conditioning load. By comprehensively considering the actual situation of the building, using scientific calculation methods, and combining with the evaluation of unit performance, energy efficiency, noise and other aspects, we can ensure that the selected unit can not only meet current needs, but also take into account possible future changes, and achieve air conditioning The efficient and stable operation of the system creates a more comfortable and energy-saving indoor environment for the building.