Heat Recovery and Spanish CAEs: Industry, Refrigeration and Farming

Label the source stream, its process function and the sink service in a flow diagram. Compressor oil cooling, refrigeration discharge gas, furnace exhaust and milk precooling have different constraints. Choose among IND110, IND230, IND290 or AGR020 only after matching the live scope to that physical pair. Give every source-sink pair a unique balance line with its own temperatures, operating overlap and displaced generator.

The source offers a temperature and mass-flow profile, not a constant annual kilowatt figure. Measure representative production states and downtime. The sink needs its own return temperature, setpoint and calendar. The lower of simultaneously available source heat and demanded sink heat limits useful recovery. Use synchronized time series rather than separate annual averages because useful recovery exists only during coincident demand.

Identify the baseline generator actually displaced, including fuel, efficiency, controls and standby behaviour. Recovered heat that warms water previously heated by a boiler has a different final-energy consequence from heat that creates a new comfort service. New demand cannot be counted as avoided consumption. Meter or justify baseline generator efficiency at the load and temperatures that recovered heat will actually displace.

Pinch or approach temperature determines whether heat can cross the exchanger at useful conditions. Fouling, pressure drop and sanitary separation may reduce transfer. State exchanger duty at actual inlet temperatures and include pump or fan electricity introduced by the recovery loop. Exchanger selection should preserve process pressure, hygiene and cleanability as well as the required thermal approach.

Thermal storage shifts heat over hours but does not solve seasonal mismatch. Model tank capacity, losses, charge limits and control priority. Do not multiply peak source power by annual operating hours when the sink is already satisfied or unavailable during much of that period. Storage calculations should show state of charge and rejected surplus through representative cycles, not only nominal capacity.

For heat recovered from refrigeration, separate energy benefits from any condensing-pressure penalty. A control that raises head pressure to produce hotter water may increase compressor electricity. Calculate the net final-energy effect within the boundary prescribed by the selected sheet. Include any compressor penalty in the same time step as recovered heat so gross and net effects remain distinguishable.

Install meters for flow and paired temperatures where practical, with synchronized logging and sensor calibration. Commission bypasses, frost or overtemperature protection, pump control and backup-generator staging. Trends should demonstrate transfer during coincident operation, not merely show two independent temperature curves. Commission protective bypasses under realistic faults while confirming that useful transfer resumes automatically afterward.

Retain process diagrams, meter specifications, raw records, exchanger and pump plates, invoices, insulation details and acceptance tests. Evidence should identify the outlet where recovered heat is consumed. A warm pipe photograph cannot establish annual useful energy or displaced fuel. Tag the final consumption point in diagrams and records, since heat delivered to a loop is not necessarily heat used.

Avoid double counting when one recovered stream feeds two sinks or when compressor efficiency and heat recovery are claimed together. Allocate heat by measured priority and cap totals at source availability. Declare parasitic electricity and any production changes during the reference period. When several sinks compete, document control priority and allocate measured heat without exceeding source availability.

Read the current code PDF and annexes before finalising the balance, since formula boundaries and documentary requirements differ. Verification may discount availability or simultaneity. No cited route secures issuance or remuneration; the investment case should be tested against conservative sink utilisation and maintenance assumptions. The reference codes for this review are IND110, IND230, IND290 and AGR020. Sensitivity should reduce simultaneous sink use and include fouling, maintenance outages and parasitic electricity.