How to calculate the cooling capacity of Acc Bus Air Conditioning?

nick51331 Bus AC Knowledge

Acc Bus Air Conditioning needs to comprehensively consider factors such as interior space, number of passengers, and ambient temperature. The specific methods and steps are as follows:

I. Basic Calculation Formula
The cooling capacity of Acc Bus Air Conditioning can be estimated using the following formula:

Cooling Capacity (kW) = Interior Space Volume (m³) × Air Change Rate × Indoor/Outdoor Temperature Difference × Air Specific Heat Capacity ÷ 3600

Interior Space Volume: Length × Width × Height (unit: cubic meters)

Air Change Rate: Usually 0.5-2 times/hour; lower values are used for vehicles with good sealing.

Indoor/Outdoor Temperature Difference: The difference between the target temperature inside the vehicle and the ambient temperature (unit: °C)

Air Specific Heat Capacity: Approximately 1.005 kJ/(kg·K)

Acc Bus Air Conditioning

II. Bus-Specific Formula
Due to the frequent starts and stops and passenger flow characteristics of buses, a more precise formula is required:

Q₁ = (A₁×N + A₂×V + A₃×S) × A₄ × A₅

A₁: Occupant cooling factor (e.g., 600 W/person for 16-30 people, 575 W/person for 31-37 people, and so on).

N: Rated number of occupants.

A₂: Interior space cooling factor (553 W/m³ for vehicles over 6m in length).

V: Interior space volume.

A₃: Solar thermal radiation factor (1190 W/m² for vehicles over 6m in length).

S: Total area of window glass.

A₄: Sealing and insulation factor (determined by referring to a table; 1.0 for good sealing, 1.2 for poor sealing).

A₅: Climatic condition factor (e.g., 0.94 for cold regions, 1.04 for hot and humid regions).

III. Practical Application Recommendations

Prioritize the Use of Dedicated Formulas: For bus scenarios, it is recommended to use the Q₁ or Q₂ formula for more accurate results.

Allow for Marginalization:The final cooling capacity needs to be multiplied by a reserve factor (usually 1.0-1.2).

Consider Variable Frequency Characteristics:Acc Bus Air Conditioning often uses variable frequency bus air conditioners; the actual power will dynamically adjust according to the load, requiring calculation based on the Energy Efficiency Ratio (EER).

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