Baths – closets – sinks – and spittoons – Vapor or heat in bath
Patent
1987-07-29
1992-08-11
Recla, Henry J.
Baths, closets, sinks, and spittoons
Vapor or heat in bath
4535, A61H 3306
Patent
active
051367343
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of heating a sauna, wherein the air in the sauna room is heated by means of a heatable stove positioned within the sauna room, and to a sauna stove for applying the method.
Previous electric sauna stoves can be heated ready for use in about 30 to 90 minutes. The air circulates therein through a so called natural circulation from between the stove stones into the sauna room. The stoves are so constructed that the stove stones and the air contained in the sauna room are heated simultaneously. A stove recommended for a sauna of a certain volume heats the sauna within the temperature range from 80.degree. to 110.degree. C. in such a manner that a desired bathing temperature and a sufficient stove temperature are achieved nearly simultaneously. With commercially available sauna stoves, the bathing temperature is adjusted by heating the stove until the temperature of the air in the sauna room reaches the bathing temperature. Thereafter the stove stones are not any longer heated, and they begin to cool. When the temperature of the air in the sauna room drops below a set value, the heating of the stove is restarted. Especially when the door of the sauna is kept closed for a long time, the sauna stove may wholly lose its steam generating capacity. This is due to the fact that even though the stove is not being heated, it keeps emitting heat to the air contained in the sauna room, so that the air gets increasingly warm while the stove cools. The air contained in the sauna room does not begin to cool until the stove has wholly lost its steam generating capacity.
One example of known solutions would be the sauna stove disclosed in Finnish Patent Specification 66,532. This sauna stove is divided into two parts to be heated separately, i.e. a stone space and an air channel. The stone space thereby includes a heating element for the stove stones, and the air channel correspondingly a heating element for the air contained in the sauna room. The stone space is further provided with a thermostat for the adjustment of the temperature of the stove stones. This arrangement is intended to ensure that the temperature of the stove and, accordingly, the steam generating capacity thereof, would not drop too low. Also, attempts have been made to prevent the excessive cooling of the stove by means of an arrangement in which the thermostat at first switches off the heating only partially, so that part of the heating efficiency is still on.
Another example of the prior art is the sauna stove disclosed in Finnish Patent Specification 61,130, in which the heating resistors are separated from the stone space by means of an absorption surface.
Known sauna stoves and systems for adjusting the bathing conditions have e.g. the following disadvantages. The heating efficiency and the stone volume of the stove, and the volume of the sauna room are strictly dependent on each other. The heating time of the sauna cannot be substantially shortened by increasing the heat efficiency of the stove, because with a shorter heating time the thermostat will turn off the heating before the stove stones have time enough to warm up in such a manner as is required for the achievement of good steam generating properties. The steam generating capacity of the sauna stove cannot be substantially improved by adding stones to the stove, because the preheating time thereby becomes unreasonably long, or the stove stones never get sufficiently hot if the thermostat turns off the heating too early in view of the warming of the stove. The bathing temperature and the steam generating capacity of the stove are strictly dependent on each other, and are operative only within the narrow temperature range from 80.degree. to 110.degree. C. In constant use, e.g. in saunas common to several apartment, it is not usually possible to maintain a good steam generating capacity if the sauna thermostat is not set to at least 100 degrees. In other words, it is not usually possible to have a good sauna bathe by throwing water on the stove stones when the h
REFERENCES:
patent: 4112281 (1978-09-01), Epps
Fetsuga Robert M.
Recla Henry J.
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