AERFERRISI

Impianti e ricambi per il riscaldamento e il condizionamento di ambienti

Fan Heating Systems for Hotels

We feel that the heating and air conditioning system is one of the most important aspects to take into consideration when building a hotel unit.

It is evident that the system has to last for decades, because it cannot be easily replaced, like other appliances; and because its management requires a strong annual share of costs, which must obviously be minimized as far as both consumption and, above all, maintenance are concerned.

One must naturally start with a precise choice, depending on the need of having only a heating system or only an air conditioning system, with all possible nuances between these two extreme cases.

Obviously, a hotel in the mountains or some areas in northern Italy only needs a heating system; it is just as obvious that some hotels that are typically for the summer and sea will only need air conditioning for the summer. However, there are some situations where summer air conditioning can be added to a pre-existing heating system, which would add prestige to the hotel. There are also cases in which normal summer air conditioning needs the addition of a winter heating system in those places that require this type of service in certain times of the year, as for instance during the Christmas or Easter holidays.

There is also a need to examine quite well the possibility of treating at the same time the entire hotel building or of treating it only partially, with the possibility of managing it in separate zones, in order to activate the different units according to the presence of guests. There is a further choice to be made between a system with fittings in every room and a system with a single machine treating the air of one whole storey or of a number of rooms. Fan heaters are well suited for the solution of this problem, since they offer the possibility of combining different choices, leaving the hotel manager free to decide, even at a later date, which will be the best operating program.

Every machine can work as a heating unit only, for air conditioning only, or for both services, depending solely on the thermic fluid that runs through the heat exchanger.

In fact, each machine consists of a heat exchanger, a coil made of a copper tube with aluminum fins, filled with water (the thermic fluid), that can be hot or cold depending on the season, and able to heat or cool the air that is blown through the exchanger by an obviously silent fan. Therefore, a system made with these machines can first of all guarantee heating and then, by adding a refrigerator group to the heating station and without modifying anything on the storeys, it can extend the service to summer cooling as well.

The only measures that need to be taken are to thermally insulate all pipes, including the ones that run in the walls, and to equip the machines with condensation drain, which is already essential when installing a winter humidifier.

Concerning the type of machine to be chosen, some remarks have to be made, it being understood that the machines are structurally equal, but differ among themselves only by size and potential.

A perfect system includes a storey by storey primary air distribution, whose function is to guarantee not only the air change in all rooms, but also the possibility to properly clean the air in bathrooms and kitchens, especially if these have no windows, as it now happens almost in all cases. The air of these service rooms must be constantly expelled, and therefore it must be replaced with the same quantity of new air, taken from outside and treated so as to be delivered in the rooms at the same temperature conditions.

It may be interesting to examine whether the air expelled from all of these rooms makes it worthwhile to install a heat recovery system, which could be done by having this air go through condensers of refrigerating systems or other water pre-heating coils.

Still with reference to the optimal system, every room will be equipped with its own air conditioner (only for the winter or for both winter and summer), so as to guarantee to each guest their choice of temperature, that can also be different from the normally chosen one.

Room by room air treatment

Obviously, with this type of system it is possible to keep the machines off in those rooms that are not occupied, or to turn them on only when the guests arrive.

Extremely interesting is, in this respect, the device by which the on/off mode is controlled by the hook where the key to the room is hanging; by handing the key to the guest, the appliance is turned on, and when the key is hanged on the hook again, it turns the system off.

The simplest proposal is the one that only uses the air change system, so expanded as to guarantee the heating not only of the changed air, but also of the expelled air; to this end, there will have to be, besides an external air inlet, also an internal air recovery; thus, also in the different rooms there will be a return of air towards the only air conditioning machine on that storey.

Storey by Storey Air Treatment

Summing up, this machine will send to the different rooms a quantity of air, a portion of which will be expelled through the blind bathrooms, and another portion will be returned to the air treatment machine, which will have to integrate it with a portion of air taken from outside.

This is evidently the most cost-efficient system, though it still guarantees all the benefits of the previous one; only, it will provide more or less identical temperatures to all rooms, unless the air flow for the vents is regulated in order to increase or diminish, where necessary, the thermic load.

Let us say, incidentally, that for new buildings, or buildings where a thorough restoration is under way, the usual solution is to adopt a small air conditioner in each room. This conditioner, that may be of the CP or CA type, is usually placed in a small entrance where it gets hidden in a lowered ceiling, whose only visible part is an inspection panel used to check the internal parts. There will be a vent blowing air into the room, while the bathroom door will be equipped in its lower part with an appropriate air passage vent for its ventilation, activated by an extractor placed on the roof. We would like to point out that the most intelligent solution is to lower the bathroom ceiling, which will be heated by irradiation, since the ceiling is run through by hot air. The irradiation system is the one that offers the best results for bathrooms, where the occupants are normally undressed.

On the other hand, the most cost-effective system is with only one machine on each storey, or one machine for a number of rooms. It is the system adopted where restoration works do not affect the structure of the building nor the rooms’ furnishings, and especially not the floors.

With this system it is possible to create excellent fixtures, both for heating and for air conditioning, by limiting the work to the simple lowering of the storeys’ corridors, a procedure that can be sufficiently silent and clean. The needed work is similar to carpentry, with the use of plasterboard or comparable materials. This way, it will be sufficient to do the work one storey at the time, allowing the hotel activity to continue, without interfering at all with life on the other storeys. This system not only implements air distribution in a simple manner, but also the water system is reduced to one or few risers, that can be often easily hidden in the closets or in the common bathrooms of the storeys.

As it can be seen, any hotel type finds the right answer to its manager’s needs. The best fan heating systems can easily satisfy the needs for partial or total air conditioning and, at any rate, they have lower setting up and management expenses, particularly if one uses machines with 5 rotation speeds that can be better applied to any type of utilization, according to the presence of guests and to heating, environmental, and external needs.

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Aerferrisi srl   Via Vittime di Bologna, 14 - 10156 Torino - Tel. 011/2740283 Fax 011/2740284   P.I. 00501690010   info@aerferrisi.com  www.aerferrisi.com