Full HAP cooling and heating load analysis and 2-pipe fan coil system sizing for a G+3, 7,212 m² workers accommodation building housing 832 occupants in Abu Dhabi's extreme summer climate. 651.4 kW coil load.
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Workers Building Chilled Water Fan Coil System Design, Abu Dhabi
A large workers' accommodation building in Abu Dhabi, ground plus three floors, 7,212 m², 832 occupants, required full cooling and heating load analysis and fan coil system sizing. The building faces Abu Dhabi's extreme summer climate, with peak outdoor air at 42.4°C DB / 22.7°C WB, combined with a high internal gains profile from lighting, equipment, and dense occupancy.
Our Approach: Floor-by-Floor HAP Analysis on a 2-Pipe Fan Coil System
- Carrier HAP analysis using a 2-Pipe Fan Coil (2P-FC) terminal unit system
- Four-floor model, ground to third, each floor 1,803 m² with 208 occupants
- Individual space peak loads identified per floor; October 14:00 governs peak zone cooling, September 14:00 governs coil load
- Ventilation outdoor air per ASHRAE 62.1: 2.5 L/s per person plus 0.30 L/s per m², totalling 4,244 L/s
Key Results
- Peak sensible zone load: 474.0 kW (October 14:00)
- Total coil load: 651.4 kW, with 554.4 kW coil sensible (September 14:00)
- Supply airflow: 42,579 L/s
- Winter heating load: 105.2 kW
- Chilled water flow: 28.06 L/s at a 5.6°C temperature rise
Load Components That Drove the Design
The September coil peak breaks down into wall transmission (58,810 W across a 1,994 m² envelope), roof transmission (59,399 W), window solar and transmission gains, 83,033 W of overhead lighting, 86,540 W of electric equipment, occupant gains of 71,967 W sensible plus 110,906 W latent from 832 people, and ventilation gains of 91,498 W sensible plus 96,788 W latent. Coil entering conditions of 26.3°C DB / 19.2°C WB and leaving conditions of 15.4°C DB / 14.8°C WB closed out the psychrometric selection. The result is a fan coil system sized on documented physics rather than rules of thumb, in a climate that punishes undersized plant.