Three fan-coil wings and a lobby on one chiller, through a manifold

Harbour View is three wings of twelve guest rooms, each wing run as one fan-coil machine — a fan and a two-pipe coil at 1.2 m³/s, breathing the rooms' own air — and a lobby-and-restaurant on the outside-air unit (the lead, carrying the latent) plus a fan coil, all five receivers on the modular chiller through a water manifold. The rooms carry the Small Hotel occupancy profile: full at night, empty by day, the mall's opposite.

The fan coils found three control defects in one afternoon: a cycling machine's on-state is the landed scale when a ceiling held it above the floor (the wings had run a 5 % trickle all night, warm and wet); a cycled chiller's leaving water is the hour's mean, not its on-state; and an off valved coil reports zero flow, so a water-serving block with nothing to chill is off — which stopped the chiller cycling for a design flow going nowhere on 2 000 idle hours.

On Miami's year the building reads 326 MWh of cooling on 110 MWh of electricity; the lobby is held with 0 humid hours since its fan coils stopped drying what the outside-air unit already dries; the wings show 8 011 humid hours each — a two-pipe fan coil has no reheat, so no ceiling is declared, and the page says so.

What it reads on Miami

What it taught

• A manifold is several couplings on one port; the receivers' returns mix by flow, a shut valve counting as a fact about the header.
• A two-pipe fan coil holds temperature, not humidity; a ceiling on it only makes it over-cool the room.
• A chiller that sees no flow is off — a flow switch at a tenth of design flow made the pair oscillate across the one-hour lag.

The machines

• Example fan-coil wing, 1.2 m³/s chilled water — open in the builder
• Example outside-air unit with heat recovery, 0.45 m³/s — open in the builder
• Example air-cooled chiller, 90 kW class — open in the builder

Sources

• DOE Commercial Prototype Building Models — Small Hotel (guest-room schedule)
• PVGIS TMY, Miami

Readings of the shipped model on the building's own PVGIS typical meteorological year; engineering estimates from catalog data and published correlations. The building runs on every plan, including Free, a few times a day.