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US3597588A Expired / Lapsed US ⏱️ 0.0 years remaining

Building service water heating system

Assignee: HARSCH Corp (HARSCO)
•
Filing: 1970-05-25
•
Granted: 1971-08-03
•
Expires: 1990-05-25
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Abstract

Abstract A building service power consumption rate-monitored electric water heating system featuring provision, in functional combination, a water storage tank; a multistep wired electric immersion heater in heat exchange association with a shroud arranged at its inner end in fluid flow communication with the interior of the tank and at its outer end with the intake of a pump, the pump being arranged to discharge through a distributor conduit back into the tank, thereby providing a circulating flow. A heated water takeoff connection is located at the top of the tank, and a cold water inlet connection is located in the lower level of the tank. An electric power supply monitoring mechanism to limit the entire building power consumption rate to a prescribed maximum is provided, to make power available in suitable increments to the water heater only when total power consumption will not exceed the prescribed maximum. Means for regulating rate of flow output of the pump is provided to be automatically responsive to temperature changes in the water as delivered by the pump by means of a water temperature sensor, and the system is so arranged as to adjust the circulating flow rate in accordance with that required to permit the heater to raise to a prescribed temperature the water being delivered by the pump. Thus, the water moving in heat exchange relation with the heater is drawn from the body of the tank and delivered into the region of the heated water takeoff connection at the prescribed temperature. The pump output flow rate control means may comprise a valve which is operative to regulate the water circulation rate so as to approach a uniform temperature throughout the body of the storage tank. As an alternative to the use of a pump throttling valve arrangement, a variable speed pump may be employed under control of a water temperature sensor located in the conduit leading away from the pump.

Inventors

  • 👤 Robert F Kirschner
  • 👤 John A Clark Jr
  • 👤 Lemuel J Morgan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 12:40
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/201; F24H1/202; F24H9/00; F24H9/0005; F24H9/001; F24H9/0015; F24H9/0021

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 165 words
An electric water heating system including a water storage tank having a feed water inlet connection, and a heated water withdrawal conduit leading from an upper level of said tank, a shroud arranged at its inner end in open fluid communication with the interior of said tank, an electric heater disposed in association with said shroud to heat water passing therethrough, a heated water conduit conducting water from a portion of said shroud remote from its inner end and delivering it into close association with said withdrawal conduit, means forcing flow of water out of said shroud into the line of said heated water conduit, and water flow rate regulating means operating in response to variations in temperature of the water flowing through said heated water conduit so as to appropriately control the rate of flow of water through said shroud in heat exchange relation with said heater so as to maintain the water being delivered to said withdrawal conduit within a prescribed temperature range.
Claim 2
Dependent Claim 165 words
An electric water heating system including a water storage tank having a feed water inlet connection, and a heated water withdrawal conduit leading from an upper level of said tank, a shroud arranged at its inner end in open fluid communication with the interior of said tank, an electric heater disposed in association with said shroud to heat water passing therethrough, a heated water conduit conducting water from a portion of said shroud remote from its inner end and delivering it into close association with said withdrawal conduit, means forcing flow of water out of said shroud into the line of said heated water conduit, and water flow rate regulating means operating in response to variations in temperature of the water flowing through said heated water conduit so as to appropriately control the rate of flow of water through said shroud in heat exchange relation with said heater so as to maintain the water being delivered to said withdrawal conduit within a prescribed temperature range.
Claim 3
Dependent Claim 25 words
An electric water heating system as set forth in claim 1 wherein said feed water inlet connection is into the lower level of said tank.
Claim 4
Dependent Claim 30 words
An electric water heating system as set forth in claim 2 wherein said water flow rate regulating means comprises a flow rate control valve disposed in said heated water conduit.
Claim 5
Dependent Claim 29 words
An electric water heating system as set forth in claim 2 wherein said water flow rate regulating means comprises means controlling the discharge flow rate operation of said pump.
Claim 6
Dependent Claim 40 words
A heating system as set forth in claim 3 wherein a multistep power control thermostat is disposed in the path of the heated water flow through said shroud, and is operable to regulate supply of electric power to said heater.
Claim 7
Dependent Claim 40 words
A heating system as set forth in claim 4 wherein a multistep power control thermostat is disposed in the path of the heated water flow through said shroud, and is operable to regulate supply of electric power to said heater.
Claim 8
Dependent Claim 48 words
A heating system as set forth in claim 3 wherein the power supply to said heater is under control of a load computer operable to preclude supply of power to said heater whenever the total load measured by the computer is in excess of a prescribed maximum rate.
Claim 9
Dependent Claim 48 words
A heating system as set forth in claim 4 wherein the power supply to said heater is under control of a load computer operable to preclude supply of power to said heater whenever the total load measured by the computer is in excess of a prescribed maximum rate.

References Cited (Backward Citations)

US2522948A Cited
US3276517A Cited
US3383495A Cited
US3484580A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-08-02 1975-02-01 1975-08-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-08-02 1979-02-01 1979-08-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-08-02 1983-02-01 1983-08-03 $7700.00 Window Closed / Lapsed

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