What is Data-center heat reuse?
Heat reuse redirects server heat to a district network, nearby building, greenhouse, or process instead of rejecting all of it outdoors. Liquid cooling collects heat in water; a heat exchanger keeps the data-center loop separate from the customer loop, and a heat pump often raises temperature to a useful level. It fits campuses with a nearby, steady heat buyer. The site needs pipe routes, pumps, metering, controls, backup heat rejection, electrical capacity for heat pumps, and contracts that define temperature, volume, uptime, price, and ownership. Summer heat demand may fall while compute runs, so the site still needs backup rejection. Ask how much heat is available by hour, at what temperature, after cooling-system and heat-pump power. Compare that profile with the customer's load and planned outages. Decide who pays for interconnection, maintains each side, and bears the risk if either party changes operation. Procurement should specify isolation, water chemistry, fail-safe control, revenue-grade meters, and a path back to normal rejection without disturbing servers. The cited Danfoss material supports the market approach, but this record does not establish a universal carbon saving, revenue, or payback; those depend on local energy, contract, and emissions conditions.