There is a nightclub with an area of 600 square meters. It has a gable roof with a height of 8 meters in the middle and 5 meters on both sides. The walls and roof are all made of rock wool sound insulation boards. It can accommodate 1,300 people. The outdoor temperature is 30℃ for three consecutive months. How many kilowatts of single-cooling air conditioning capacity is needed?
1. Core Heat Load Calculation
1) Personnel heat dissipation (main load
• Per capita heat dissipation:
Vigorous activities (dancing/drinking) are charged at 300W per person (sensible heat + latent heat).
The total load = 1300 people × 0.3kW = 390 kW
2) Building heat transfer
The heat transfer coefficient of rock wool sound insulation board: U value ≈0.5 W/(㎡·K) (good insulation performance).
• Roof/Wall temperature difference: 30℃ outdoors → 24℃ target indoors, ΔT=6℃.
Heat transfer capacity = 600㎡ × 0.5W/(㎡·K) × 6K = 1.8 kW (negligible).
3) The equipment is overheating
• Lighting/Sound: LED large screen + laser light approximately 20kW, 50% converted into heat → 10kW.
• Wine refrigeration cabinet: The heat dissipation of the compressor is approximately 5kW.
4) Fresh air load
Minimum fresh air volume: At 30m³/(h· person), 39,000m³/h is needed for 1,300 people.
Cooling and dehumidification load:
To cool the outdoor air from 30℃/70%RH to 24℃/50%RH, approximately 120kW is required (calculated using the enthalpy difference method).
2.Total cooling Capacity Demand
• Instantaneous peak load:
390 (personnel) + 1.8 (buildings) + 10 (equipment) + 120 (fresh air) ≈ 522 kW
• Safety margin (20%) :
The final demand = 522 × 1.2 ≈ 626 kW
3.Solution
Product Name: Rooftop Package Air Conditioning Unit
Number: 2 units of WKLF310 which does only cooling
Installation: The WKLF310 can be placed on the ground beside the building, user needs to get some air ducts to be connected with the WKLF310, so the cold air is delivered to the room space through air ducts. The air ducts distribute the cold air more evenly in the room space.
PARAMETERS TABLE FOR EACH UNIT
|
WKLF310 |
||
|
COOLING CAPACITY |
kW |
308.9 |
|
104kcal/h |
265.7 |
|
|
CAPACITY CONTROL |
% |
100,75,50,25,0 |
|
AIR FLOW RATE |
m3/h |
52000 |
|
E.S.P. |
Pa |
≥650 |
|
TEMP. RANGE |
℃ |
18~30℃ ±2℃ |
|
POWER SUPPLY |
480V/60Hz 3-PHASE |
|
|
RATED POWER(kW) |
121.7 |
|
|
COMPRESSOR |
TYPE |
SEMI HERMETIC SCREW COMPRESSOR |
|
NUMBER |
1 |
|
|
INPUT POWER |
90.7 |
|
|
REFRIGERANT |
TYPE |
R407c |
|
THROTTLING |
THERMAL EXPANSION VALVE |
|
|
EVAPORATOR |
TYPE |
COPPER PIPES INSERTING ALUMINUM FINS |
|
AIR SUPPLY FAN |
TYPE |
DOUBLE INTAKE CENTRIFUGAL TYPE |
|
POWER(kW) |
22 |
|
|
CONDENSING FANS |
TYPE |
LOW NOISE AXIAL FLOW TYPE |
|
NUMBER |
6 |
|
|
POWER(kW) |
9 |
|
|
AIR FILTER |
TYPE |
PRIMARY STAGE/PLATE TYPE G4 |
|
DIMENSION |
LENGTH(mm) |
6200 |
|
WIDTH(mm) |
2200 |
|
|
HEIGHT(mm) |
2400 |
|
|
WEIGHT |
kg |
5800 |
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