US2557369A - Heating system - Google Patents

Description

Patented June 1?, 1951 UNITED STATES PATENT OFFICE erick executrix of said Frederick C. Broderick,

deceased Application February 21, 1948, Serial No. 10,092

8 Claims. 1

' This invention relates to new and useful improvements in heating system of the type using forced hot water circulation for heating the rooms or spaces and in which is incorporated a heat exchanger for heating water for domestic use over which the hot water of the system is force circulated. In modern heating of the panel type wherein the walls or floors of the rooms are heated, it is desirable to provide a constant relatively low heat. To effect this condition it has been found that a constant circulation of hot water through the heating panels is desirable. The system herein described is particularly adaptable for such heating,

The primary purpose of this invention is to provide such a system wherein, during the space heating seasons, the water is constantly circulated in both the domestic hot water and radiator or panel circuits but during the summer or warm seasons the domestic circuit is pump circulated only when heat is required.

Another object of this invention is to provide two distinct circuits utilizing the heated water of the boiler, one being the domestic hot water circuit and the other being the space heating circuit, both using forced circulation produced by a single motor.

Still another object of this invention is to provide in such a system a double impeller pump for circulating water independently through both circuits.

A still further object of this invention is to provide in such a heating system a simple, inexpensive arrangement of parts that will efficiently function to provide even heat for rooms and adequate hot water for domestic use.

' And still a further object is to provide such a system wherein the return water from the space heating circuit is mixed partially with the hot Water supply to temper the heating water directed to the radiating means.

Further objects and advantages will be apparent from the following detailed specification.

In the drawings:

Fig. 1 is a diagrammatic view of a heating system embodying the invention herein described.

Fig. 2 is an enlarged sectional view of the pump and pipe arrangement of the system shown in Fig. 1.

Fig. 3 is a cross-sectional view of fitting 28.

In detail, I is a boiler heated by burner mechanism 2 and provided with a riser 3 leading to a tank 4 within which is positioned a heat exchange coil 5. A high limit or safety immersion type thermostat 5 and alow temperature respon- 2 sive thermostat l of similar type are both positioned on the tank to be responsive to the temperature of the water therein.

Conduit 8 leads to pump 9 which is operated by motor l0. Impeller shaft it extends from motor 10 and on its end are two impellers l2 and I3 separated by a partition I 4 forming two chambers l5 and i6. Chamber l5 has an inlet l1 and an outlet l8- Chamber [6 has a return inlet 19, a supply inlet 20 and an outlet 2!. Thus the pump casing has in fact three inlets and two outlets.

Conduit 8 connects with inlet I! of pump 9 and outlet I8 is connected by means of pipe 22 to main boiler return conduit 23.

A supply conduit 24 leads directly from the boiler to supply inlet 20 of chamber [6. Positioned in said conduit 24 is a motor valve 25. A pipe 26 leads from the outlet 21 to return pipe 23 and radiator supply conduit 21. At the point of junction a shunt fitting 28 is interposed to direct a portion of the water flowing from pipe 26 to return pipe 23 and a portion to supply conduit 21.

Supply conduit 21 leads to the radiating means 29 which may be in the form of conventional radiators, panel type heat exchange units or any radiating means. Usually a plurality of such units-are used but for convenience only one is shown in the drawing. Radiator return conduit 30 leads to return inlet l9 of the pump.

The elements above described are controlled by the immersion type thermostats 6 and I and room thermostat 3| which is usually positioned in the space to be heated. Motor valve is of the usual type adapted to be opened when energized and closed otherwise. A two contact manual switch 32 is provided for the purpose hereinafter described. Electrical conductors connect a source of electricity with the controls 8, l and and the heater 2, pump motor Ill and motor valve 25, as shown, so as to function as now described.

With the switch 32 in the position as shown in Fig. 1, immersion thermostat i will close the circuit that actuates the heater 2 and pump 9 whenever the water in tank 4 falls below a predetermined temperature and will break thecircuit when the temperature is attained. Safety thermostat 6 will break the circuit if the water reaches a determined high temperature to prevent overheating in the event thermostat 1 fails to function. This is the situation during the warm seasons when space heating is not needed.

Switch 32 is moved to its other position at the begining of space heating seasons and as soon as this is done the pump 9 starts and continues uninterruptedly until the switch is moved to its first or summer position. Thermostats 6 and I will control heater 2 and thermostat 3! will control motor valve 25 to open it when heat is needed adjacent the radiating means 29.

In operating during warm seasons the pump 9 will circulate water from boiler I through tank 4 and back through pipes 8, 22 and 23 whenever thermostat I calls for heat. The water in tank 4 will be maintained at the desired temperature by thermostat I which controls heater 2 as well as pump 9 with switch 32 in summer position.

During space heating or cold seasons the pump 9 will circulate water continuously through the domestic hot water circuit from boiler I through tank 4 and return, the temperature of the water being controlled by thermostats 6 and I. Also, water will be circulated continuously through the radiating or space heating circuit, its temperature being controlled by thermostat 3| which will open motor valve 25 whenever more heat is needed, to admit freshly heated boiler water from conduit 24 to that circuit. The heated water from the boiler is mixed directly with the return water from the radiators in chamber l6 and part of this mixture is returned to the boiler through conduit 23 and the rest directed to the radiator 29 by means of shunt fitting 28 and conduit 21.

It is clear that pump 9 is controlled by immersion thermostat 1 during warm seasons with switch 32 in position shown in Fig. 1 but that in cold seasons with switch 32 in its other position the pump is independent of any control and operates continuously.

It is also clear that in the cold weather when the radiating circuit is functioning it will not draw hot water from the boiler to such an extent that the water in the heat exchange coil 5 will not be heated adequately because the domestic hot water circuit enjoys forced circulation whenever the radiating circuit is in operation. Thus boiler water will be rapidly drawn over coil 5 to assure adequate heat exchange.

Moreover, it is obvious that the constant circulation of water through the radiating means 29 and the periodic addition of hotter water thereto, as called for by thermostat 3|, will provide an even constant heat for.the space to be heated.

I claim:

1. In a hot water system comprising a space heating circuit and a domestic hot water circuit, the improvement that comprises a circulating pump having two impellers separated by a partition, one of said impellers connected in the domestic circuit, the other in the heating circuit, a hot water supply conduit connected with the .pump in the heating circuit, a motor valve interposed in said conduit, means for continuously operating said pump during heating seasons, means 'controlling the temperature of the water in the hot water circuit and temperature responsive means controlling the operation of the motor valve for admitting heated water to the space heating circuit.

2. In a hot water system comprising a space heating circuit and a domestic hot water circuit ,the improvement that comprises a circulating pump having two impellers separated by a par- I tition, one of said impellers connected in the domestic circuit, the other in the heating circuit, a hot water supply conduit connected with the pump in the heating circuit, a motor valve interposed in said conduit, means for continuously operating said pump during heating seasons,

4 means controlling the temperature of the water in the hot water circuit and temperature responsive means controlling the operation of the motor valve for admitting heated water to the space heating circuit and a switch for stopping the continuous operation of the pump and putting it under control of the water temperature control means during non-space heating seasons.

3. In a hot water heating system comprising a space heating circuit and a domestic hot water circuit each independently receiving its supply of heated water from a boiler, the improvement that comprises a circulating pump with two impellers separated by a partition, one of said impellers connected in the domestic circuit, the other in the space heating circuit, automatic valve means controlling the supply of heated water to the space heating circuit, a thermostat controlling the valve, an immersion thermostat controlling the temperature of the water in the boiler and means for continuously operating the pump during space heating seasons to provide constant forced circulation in both circuits.

4. In a hot water heating system comprising a single boiler and heater, space heating circuit comprising radiating means with supply and return pipes and a domestic hot water circuit comprising a tank and heat exchange coil in said tank, the improvement that comprises a double impeller pump, a partition separating said impellers to form two chambers, one chamber being interposed in the space heating circuit, the other in the hot water circuit, a supply conduit joining the boiler with the first chamber, automatic A valve means controlling the supply of hot water to said first chamber and means for continuously operating the pump during heating seasons to maintain forced circulation throughout both circuits.

5. In a hot water heating system comprising a boiler and two independent circuits, one for heating spaces and one for heating water, the improvement that comprises a pump having two impellers, a partition separating said impellers to form two chambers, two ports in one chamber, conduits connecting said ports in the water heating circuit, three ports in the other chamber, conduits connecting two of said ports to the space heating circuit and the other to the boiler, an automatic valve controlling said boiler connecting conduit, thermostatic means controlling the Water temperature of the boiler, a motor continuously operating said pump during heating season and thermostatic means in the space to be heated controlling said valve.

6. In a heating system comprising a water heating circuit and a space heating circuit each receiving their hot water from the same boiler, the improvement that comprises a double impeller pump connected in said circuits with each impeller adapted to separately circulate one circuit, a motor for continuously operating said pump in heating seasons, a supply conduit connecting the boiler with the space heating circuit, a valve controlling said conduit, a room thermostat controlling said valve to admit hot water to said circuit when needed, a water thermostat controlling the boiler water temperature and a switch positioned in said motor circuit for stopping its continuous operation and putting the motor under the control of the water thermostat for summer operation.

7. In a heating system comprising a water heating circuit and a space heating circuit each receiving their hot water from the same boiler,

5 the improvement that comprises a double impeller pump connected in said circuits with each impeller adapted to separately circulate one circuit, a motor for continuously-operating said pump in heating seasons, a supply conduit connecting the boiler with the space heating circuit, a valve controlling said conduit, a thermostat controlling said valve to admit hot water to said circuit when needed and mix it with the circuit return water and means for diverting some of such mixed water directly back to the boiler.

8. In a heating system comprising a water heating circuit and a space heating circuit each receiving water from the same boiler, the improvement that comprises a double impeller pump having separate chambers for each impeller, each impeller connected in one of the circuits, a conduit leading from the boiler to one of the chambers, a radiator supply pipe leading from said chamber, a radiator return pipe leading to said chamber, a motor valve controlling the supply of hot water from the boiler to said chamber, a room thermostat controlling said valve, a burner an immersion type thermostat controlling the temperature of the boiler water by'actuating the burner when heat is needed, a motor for the pump and a two contact switch connected in said system to cause the motor to operate continuously in the space heating season and to put the motor under the control of the immersion type thermostat in other seasons.

FREDERICK C. BRODE'RICK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,401,193 Schetzel Dec. 27, 1921 29 2,081,831 Moore May 25, 1937 2,322,872 Moore June 29, 1939

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