Commercial refrigeration: integral vs remote

Where the condenser - which rejects the heat the fridge removes from inside - is located. Integral refrigeration has the condenser (and compressor) built into the unit, so the refrigeration is self-contained and the heat is rejected where the unit is, into the kitchen. Remote refrigeration has the condenser located elsewhere (a plant room or outside), connected to the unit by refrigerant pipework, so the heat is rejected away from the kitchen. So the fundamental difference is where the heat is rejected: integral into the kitchen, remote away from it. This drives the main consequences - an integral unit's heat, ventilation load and noise go into the kitchen, while a remote unit's heat is sent away, keeping the kitchen cooler and quieter - and the trade-off, integral being simpler and self-contained, remote needing pipework and plant space. So the difference is essentially about where the refrigeration's waste heat goes.

Because its condenser is in the kitchen, so it rejects its heat there. Refrigeration works by removing heat from inside the unit (keeping the contents cold) and rejecting that heat outside via the condenser - and for an integral unit, the condenser is built into the unit, in the kitchen, so the heat it rejects is dumped into the kitchen. This adds to the kitchen's heat load, making it hotter, and therefore to the ventilation load (the extraction has more heat to remove), and the condenser and its cooling fan add noise. For a single small unit this heat may be modest, but for larger units or several units the combined heat dumped into the kitchen can be significant. So an integral unit makes the kitchen hotter because it rejects its waste heat there - which is the trade-off for its simplicity and self-containment. A remote unit, by contrast, rejects its heat away from the kitchen, so it does not add to the kitchen's heat.

Its main advantages all come from rejecting its heat away from the kitchen, where the remote condenser is. The kitchen stays cooler, because the refrigeration's heat is not dumped into it. The ventilation load is reduced, because the extraction does not have to remove the refrigeration's heat. And the kitchen is quieter, because the condenser and its cooling fan - the noisy parts - are located elsewhere, not in the kitchen. So remote refrigeration keeps the heat, ventilation load and noise out of the kitchen. The cost is that it needs the refrigerant pipework connecting the unit to the remote condenser, and space for the condenser (a plant room or external space), so it is more involved and usually more costly to install, and not as easily moved. So remote's cooler, quieter, lighter-ventilation-load kitchen comes at the cost of the pipework and plant space. Its benefit is greatest where the heat that would otherwise go into the kitchen is significant.

Choose integral for smaller installations, single units, and situations where simplicity and the ability to move the unit matter, and where the heat dumped into the kitchen is modest and acceptable. An integral unit is a complete, plug-in item - simple to install (no external condenser or pipework) and simple to move (self-contained) - so it suits a single unit or a smaller installation where that simplicity is valuable and the heat it adds to the kitchen is not a significant burden. Choose remote for larger installations, multiple units, and situations where keeping the heat, ventilation load and noise out of the kitchen matters - such as a large cold store, or several units whose combined heat into the kitchen would be significant. So the choice turns largely on the scale of the heat: small and simplicity-valued, integral; significant and better kept out of the kitchen, remote. Installation cost, movability and plant-space availability also weigh in.

Yes - the refrigeration's heat is part of the heat load the ventilation has to manage, so integral versus remote affects it. Integral units add their heat to the kitchen, so they add to what the ventilation must remove - which is worth factoring into the ventilation design and load, especially with several integral units whose combined heat is significant. Remote units do not add their heat to the kitchen (it is rejected elsewhere), so they lighten the ventilation's job. So the integral-versus-remote choice affects the kitchen's heat and ventilation load: choosing integral adds the refrigeration's heat to the ventilation's burden, while choosing remote keeps it off. This is worth considering alongside the refrigeration itself, particularly in a kitchen where the heat and ventilation load are already a concern - the refrigeration arrangement is one of the things that adds to or spares the ventilation, depending on whether its heat goes into the kitchen or away.

Yes - both integral and remote refrigeration, like all the kitchen's equipment, need keeping clean and maintained to work well. The condensers (wherever located) need to be kept clean to reject heat efficiently - a dirty condenser rejects heat less effectively, making the refrigeration work harder and less efficiently. And the units themselves need to be kept clean and hygienic as cold storage, regardless of the integral-or-remote arrangement, because they hold food (as covered for cold stores generally). So whether integral or remote, the refrigeration has to be maintained and kept clean to work properly - the condensers cleaned for efficiency, the units cleaned for hygiene - on top of the integral-versus-remote choice about where the heat goes. So the cleaning and maintenance of the refrigeration apply to both types; the integral-versus-remote decision is about the heat arrangement, but the ongoing care (keeping it clean and maintained) is needed either way to keep the refrigeration working efficiently and hygienically.