GB1574327A

GB1574327A - Waste heat utilization

Info

Publication number: GB1574327A
Application number: GB16236/77A
Authority: GB
Original assignee: INST DE PESQUISAS E APERFEICOA
Current assignee: INST DE PESQUISAS E APERFEICOA
Priority date: 1977-04-19
Filing date: 1977-04-19
Publication date: 1980-09-03

Description

(54) IMPROVEMENTS IN OR RELATING TO WASTE HEAT UTILIZATION (71) We, INSTITUTO DE PES QUISAS E APERFEICOAMENTO INDUSTRIAL, a body corporate organised under the laws of the Republic of Brazil, of Avenida Dr. Carlos Botelho, 1465, Sao Carlos, State of SWo Paulo, Republic of Brazil, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: This invention relates to a domestic washing installation, such as a bath or shower installation, including a hot water supply system for delivering water from a fresh water supply source via a main water heater to a hot water outlet which is arranged to discharge water that has been heated by said main water heater into a receptacle; a waste water discharge system connected to a waste water oultet from said receptacle; and a heatexchanger having a first passage connected in said hot water supply system between said fresh water supply source and said main water heater and a second passage connected in said waste water discharge system and separated from said first passage by heatconducting partitioning, so that said heat exchanger serves in operation for preheating water from said fresh water supply source before it reaches the main water heater.

An object of this invention is to provide improvements in the construction and arrangement of the heat-exchanger of such a domestic washing installation.

According to the present invention, the first passage of the said heat-exchanger consists of a right cylindrical inner chamber having inlet and outlet openings at its two opposite ends respectively and the second passage thereof is formed between the wall of the inner chamber and a right cylindrical outer casing which is coaxial and longitudinally coextensive with the first passage, said outer casing having inlet and outlet openings formed therein at longitudinally spaced apart postions.

An embodiment of the invention will now be described with reference to the accompanying drawings, in which: Fig. 1 is a schematic partly sectional view of a shower system embodying the invention, and Fig. 2 is a cross-sectional view taken on the line AB in Fig. 1.

In Fig. 1 of the drawings there is shown a shower arrangement in which clean water 11 comes from a supply system (not shown) through a pipe 2, to a heat exchanger 1 where it is pre-heated. By piping 3 from the exchanger 1 the clean water flows on to a heater 6, which may be an electric heater, where it is heated a second time. From the heater 6 the clean water goes through piping 7 to an eJector 8 or shower hcad where it is then eJected. After being used for the purpose for which it is intended, e.g. showering.

the waste water 12, still having a part of the thermal energy received, is gathered in a reccptable 10 from whence, through piping 4 it enters the heat exchanger. In this latter, the waste water gives up part of the thermal energy received, Q, to the clean water, while both are flowing through the heat exchanger.

Through piping 5, the waste water, now being drainage water, goes down a drainage nctwork.

The clean water, during the pre-heating phase, never enters into direct contact with the drainage water. The heat exchange between both is carried out through the heat conducting walls which exist in the heat exchanger and separate the clean water from the waste water.

As can be seen from Fig. 2, the heat exchanger 1 is in the form of a central cylindrical clean water chamber connected at its inlet end to the pipe 2 and at its outlet end to the piping 3, and a cylindrical waste water racketing chamber arranged below the receptacle 10 and surrounding the central chamber.

WHAT WE CLAIM IS: 1. A domestic washing installation including a hot water supply system for delivering water from a fresh water supply source via a main water heater to a hot water outlet which is arranged to discharge water that has been heated by said main water heater into a receptacle; a waste water discharge system connected to a waste water outlet from said receptacle; and a heat-exchanger having a first passage connected in said hot water supply system between said fresh water supply source and said main water heater and a second passage connected in said waste water discharge system and separated from said first passage by heat-conducting parititioning, so that said heat-exchanger serves in operation for preheating water from said fresh water supply source before it reaches the main water heater, wherein the first passage of said heat-exchanger consists of a right cylindrical inner chamber having inlet and outlet openings at its two opposite ends respectively and the second passage thereof is formed between the wall of the inner chamber and a right cylindrical outer casing which is coaxial and longitudinally coextensive with the first passage, said outer casing having inlet and outlet openings formed therein at longitudinally spaced apart positions.

2. A domestic washing installation according to claim l, wherein the heat exchanger is disposed with its central axis horizontal. the inlet opening of the second passage faces upwardly and is connected by a vertical conduit to the outlet of the recepta cle and the outlet opening of the second passage faces downwardly and is connected to a drain pipe extending vertically downward therefrom 3. A domestic washing installation according to claim 1 or 2. wherein the main water heater is an electric water heater.

4. A domestic shower installation sub stantiallv as hereinbefore described and as shown in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. receptacle 10 and surrounding the central chamber. WHAT WE CLAIM IS:

1. A domestic washing installation including a hot water supply system for delivering water from a fresh water supply source via a main water heater to a hot water outlet which is arranged to discharge water that has been heated by said main water heater into a receptacle; a waste water discharge system connected to a waste water outlet from said receptacle; and a heat-exchanger having a first passage connected in said hot water supply system between said fresh water supply source and said main water heater and a second passage connected in said waste water discharge system and separated from said first passage by heat-conducting parititioning, so that said heat-exchanger serves in operation for preheating water from said fresh water supply source before it reaches the main water heater, wherein the first passage of said heat-exchanger consists of a right cylindrical inner chamber having inlet and outlet openings at its two opposite ends respectively and the second passage thereof is formed between the wall of the inner chamber and a right cylindrical outer casing which is coaxial and longitudinally coextensive with the first passage, said outer casing having inlet and outlet openings formed therein at longitudinally spaced apart positions.

2. A domestic washing installation according to claim l, wherein the heat exchanger is disposed with its central axis horizontal. the inlet opening of the second passage faces upwardly and is connected by a vertical conduit to the outlet of the recepta cle and the outlet opening of the second passage faces downwardly and is connected to a drain pipe extending vertically downward therefrom

3. A domestic washing installation according to claim 1 or 2. wherein the main water heater is an electric water heater.