A source looking for a sink
Large cold stores reject heat for many hours but may have limited onsite heat demand. Offices and hot water are often too small to absorb it. Nearby process users, vehicle washing or a heat network can change the case.
Low condensing pressure still matters
Raising refrigeration condensing temperature to improve recovery may increase compressor energy. The system should recover heat at efficient refrigeration conditions and use a heat pump when a higher sink temperature is justified.
Location can decide value
Heat is costly to move over distance and loses temperature. A large theoretical source is not a project until a credible sink is identified.
Prove that a useful sink exists
A distribution warehouse can reject substantial heat for long hours while using little process heat onsite. Domestic hot water and offices rarely absorb the full source. Vehicle washing, neighbouring industry or a heat network may increase the opportunity, but distance, temperature loss and commercial interfaces must be included.
Create a sink register before selecting a heat pump. Record the required temperature, annual quantity, hourly profile, distance and ownership of each demand. Heat with no simultaneous destination remains a cooling load rather than an energy-saving project.
Do not penalise refrigeration to improve recovery
Higher condensing temperature can make recovered heat easier to use while increasing refrigeration compressor power. Compare the combined refrigeration and heating electricity for each option. Efficient low-pressure condensing followed by a dedicated heat pump may outperform deliberate head-pressure elevation.
The control design needs a normal heat-rejection route for warm weather, low sink demand and maintenance. Supplier calculations should cover seasonal source conditions, defrost, minimum heat-pump load and any effect on the cold store's resilience.
Sources
General technical explanation. No specific external source claims are made on this page.