Liquid heaters and vaporizers – Water tube – Coil
Patent
1999-05-03
2000-11-28
Wilson, Pamela
Liquid heaters and vaporizers
Water tube
Coil
122 33, 122250R, F22B 2126
Patent
active
061520861
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Heating appliances with an improved efficiency (IE) and high efficiency (HE) are in large scale use in the Netherlands and elsewhere for heating dwellings and other accommodation areas. For many dwellings it is important that such heating appliances take the most compact possible form, while it must be avoided that the appliances are so complicated that regular, costly servicing and maintenance has to take place.
These known heating appliances have a number of drawbacks, a number of significant ones being: the size of the appliances, whereby they are difficult to build into a cupboard or the like; the emission of CO and NO.sub.x as well as the associated efficiency loss, for instance because considerable temperature differences are present inside the apparatus.
SUMMARY OF THE INVENTION
The present invention provides an apparatus for heating fluid, comprising: and arranged helically round the burner means.
A heating appliance is obtained with the present invention which can be embodied compactly and wherein emissions and efficiency loss are limited.
Preferred embodiments of the apparatus relate to further improvements in efficiency and reduction in emission of undesired combustion products by precise guiding of the combustion products along the heat exchanger.
A jacket provided with openings is preferably arranged round the helical heat exchanger in order to enable a good heat exchange between the combustion gases and the pipes of the heat exchanger. These openings can be round or slot-shaped and are preferably arranged behind the helically running pipe of the heat exchanger. The jacket may also be formed from wound strips or band of metal between which openings are left clear.
In a so-called combi-appliance is included an insulated tank or reservoir of relatively small dimensions from which hot tap water is immediately available. A compact combi-appliance with a power of for instance 22-24 kW has to be capable of providing 6 liters of water per minute at 60.degree. C. from this insulated storage tank. In the known combi-appliances however, it is found in practice that, while water at 60.degree. C. is supplied for a short time, the temperature of the tap water thereafter decreases and a constant value above 60.degree. C. is reached only after for instance one minute. This is particularly the case if the heating appliance is not used or is used to a lesser extent (as according to so-called modulating operation) to heat fluid in pipes and radiators of the heating system in the dwelling. Although a preferred embodiment of the present invention is provided with such a reservoir, another preferred embodiment is provided with a heat exchanger which takes up little space.
The present invention further provides an apparatus which is provided with a reservoir for temporarily storing heated water, wherein the reservoir comprises a second heat exchanger which is operationally coupled to the first heat exchanger.
The first heat exchanger will preferably be provided in the future with an inner pipe and an outer pipe, whereby the tap water is further heated in the inner pipe.
The apparatus according to the present invention is preferably provided with a third heat exchanger which is arranged in the discharge duct for the heated flue gases and which serves to preheat the tap water.
The preferred embodiment with a reservoir is preferably provided with pump means for pumping medium round in the heating circuit provided with a rotation speed regulation, or at least an ON/OFF control, wherein the pump action is reduced or interrupted at the moment wherein hot water is demanded from the hot water reservoir by the user, or immediately thereafter, whereby, in the case the apparatus is not used for heating purposes, the relatively cold water from the first heat exchanger is prevented from entering the reservoir. If necessary, the burner is started and the first heat exchanger heated, whereafter the pumping action of the pump means is increased.
The flue gases are preferably urged closely along the
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patent: 4823557 (1989-04-01), Bottum, Jr. et al.
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Benschop Wim
Brouwer Johan Derk
De Bruin Paulus Albertus
Cooperatieve Inkoopvereniging
Wilson Gregory A.
Wilson Pamela
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