What Is a Dedicated Heat Recovery Chiller?
A dedicated heat recovery chiller produces chilled water and hot water simultaneously — capturing the condenser heat (normally rejected to the cooling tower) as useful heating. Buildings with concurrent heating and cooling loads (hospitals, hotels, labs, multifamily with central DHW) get both from one machine's energy input. The efficiency: effectively 200%+ (one energy input, two useful outputs) — the thermodynamic free lunch where the loads coincide.
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How heat recovery chillers work
The chiller's refrigeration cycle moves heat from the chilled-water loop to the hot-water loop (instead of the cooling tower): the evaporator cools the building, the condenser heats the domestic hot water or the heating loop. When the heating and cooling loads balance, the machine runs at extraordinary effective efficiency (the combined COP reaching 6-8+). When loads do not balance, the excess rejects to the tower (cooling-dominant) or the boiler supplements (heating-dominant) — the controls manage the balance.
Applications
Hospitals (simultaneous cooling and reheat/sterilization loads — the textbook application), hotels (cooling plus domestic hot water), multifamily with central DHW (the hot-water base load absorbs the recovery), labs (process cooling plus heating), and natatoriums (dehumidification heat recovering to pool water). Any building where significant heating and cooling coexist year-round.
Design considerations
The MEP engineer profiles the concurrent loads (the recovery value depends on the overlap — the load-duration analysis quantifies it), sizes the chiller for the balanced duty (with the tower/boiler handling the imbalance), designs the temperature regimes (the hot-water temperature the chiller can produce — typically 120-140°F — must serve the heating loads), and sequences the controls (prioritizing the recovery operation). First cost exceeds separate systems; the energy savings (30-50% of the heating/cooling energy) pay back where loads coincide.
The bottom line
Heat recovery chillers produce chilled and hot water simultaneously at 6-8+ effective COP — for hospitals, hotels, and labs with concurrent loads. Profile the load overlap to quantify the value.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.