【HVAC Version】Daily Question 20180417
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How is the minimum fresh air volume for an air conditioning system determined? Answer: (1) The amount of fresh air required to meet hygiene standards; (2) The amount of fresh air needed to supplement local exhaust ventilation and maintain a \"positive pressure\" in the air-conditioned room; (3) At least 10% of the total supply air volume of the system; (4) The maximum value among these three amounts shall be used as the minimum required amount of fresh air for the system
How is the minimum fresh air volume for an air conditioning system determined? 1. Determined based on the minimum air exchange rate per person * number of people. 2. Determined based on leakage through gaps + local exhaust ventilation
1. Determine based on the minimum fresh air volume per person * number of people. 2. Determine based on leakage through gaps + local exhaust; choose the higher of the two values
1. Determined based on the minimum fresh air volume per person * number of people. 2. Determined based on leakage through gaps + local exhaust ventilation; the higher of these two values is used, as specified in the \"GB 50736-2012 Code for Design of Heating, Ventilation and Air Conditioning in Civil Buildings\".
The required volume of fresh air per person per hour varies depending on the location; it is generally around 30 cubic meters per hour. The amount of fresh air needed is determined by considering the number of ventilation cycles. Among the following options – 1) fresh air per person per hour, 2) fresh air for ventilation purposes, 3) fresh air needed to maintain positive pressure in the room – the highest value is chosen as the amount of fresh air required for the system
1. Hygiene requirements (minimum fresh air volume per person)； 2. Need to reduce harmful substance concentrations ； 3. Minimum ventilation rate requirement for rooms ； 4. Not less than 10% of the total supply volume ；
1. Fresh air volume per person per hour; 2. Air exchange fresh air volume; 3. Fresh air volume required to maintain positive pressure in the room. The highest of these values shall be used as the system’s fresh air volume
1. Determined based on the minimum fresh air volume per person * number of people. 2. Determined based on leakage through gaps + local exhaust ventilation; the higher of these two values is used, as specified in the \"GB 50736-2012 Code for Design of Heating, Ventilation and Air Conditioning in Civil Buildings\".
In short, when it comes to fresh air volume in air conditioners, the general requirements are: first, to maintain a positive pressure, and second, to meet hygiene standards.
1. Hygiene requirements (minimum fresh air volume per person)； 2. Need to reduce harmful substance concentrations ； 3. Minimum ventilation rate requirement for rooms ； 4. Not less than 10% of the total supply volume ；
1. Hygiene requirements (minimum fresh air volume per person)； 2. Need to reduce harmful substance concentrations ； 3. Minimum ventilation rate requirement for rooms ； 4. Not less than 10% of the total supply volume ； For fresh air volume, the general requirements are: first, to maintain positive pressure; second, for hygiene reasons. If it refers to the circulating air volume, it is generally calculated as the number of air changes. Different building environments have different requirements. Ventilation is generally also considered part of the air change rate, with local exhaust ventilation also being taken into account, of course. The exhaust volume is generally calculated as a percentage of the fresh air volume, in order to maintain a certain pressure