iv New Patents

(5) connected by conduit (8) to a condenser (9), an expansion valve (I 1) connected by conduit (40) to said condenser (9), an evaporator (7) con- nected by conduit to said expansion valve (11) and an absorber (13) connected by conduit (34) to said evaporator (7) and connected by two separate conduits (41, 42) to the generator (5), one conduit (42) having an expansion valve (15) therein.

4448136

A.A.A.S242

H E A T - E X C H A N G E R W I T H A B U N D L E O F P A R A L L E L L Y

E X T E N D I N G P I P E S A D A P T E D T O B E A C T E D U P O N B Y A I R

Rudolf Andres, Helmut Grantz, Wolf-Dietrich Munzel, Wolfgand Odebrecht, Sindelfingen, Federal Republic Of Germany assigned to Daimler-Benz Aktiengesellschaft

B O I L E R W I T H W A S T E H E A T R E C O V E R Y

Martin White, Kingston upon Thames, United Kingdom assigned to British Gas Corporation

8 ~ 4

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A fuel-fired fluid heating appliance, such as a gas-fired boiler (FIG. 1) is provided for heating a fluid such as water circulating in a central heating system. The boiler includes a flue 4 for discharging the combustion products, e.g. ex- haust gas, to atmosphere by way of a heat ex- changer 8 incorporated within a portion 6 of the flue 4 external of the boiler housing 1. The heat exchanger 8 is provided with an inlet 16 to receive water from a return flow pipe 36 and an outlet 17 to discharge the water to the inlet 35 of the boiler primary heat exchanger 3. The heat ex- changer 8 (FIG. 2) is provided with a number of ducts 18 along which the exhaust gas travels to transfer its heat to the water circulating within compartments 29 to 33 within the heat ex- changer housing 15. The external portion 6 of the flue 4 is disposed at an angle of 20 degrees downwardly to the horizontal so that any ex- haust gas condensing in the heat exchanger 8 flows down the flue base 9 to a discharge spout 10 and collector weir 11. In an alternative ar- rangement (FIG. 4), the condensate outlet 45 is located at the base of the flue 40 within the boiler, the outlet 45 terminating outside the boiler housing I. In this case that portion 42 of the flue external of the boiler and incorporating the heat exchanger slopes upwardly at an angle of 20 degrees to the horizontal.

A heat-exchanger with a bundle of parallelly ex- tending pipes adapted to be acted upon by air w.hich are constructed in the manner of heat pipes; a connection box extends transversely to the pipe bundle which surrounds section-wise the heat pipe hollow spaces of the pipe bundle and which is adapted to be traversed by a heat carrier medium; the connection box essentially consists of an extruded profile whose profile direction is disposed parallel to the pipe rows of the bundle and is provided at its end faces with guide covers which take over the distribution and deflection of the heat carrier medium toward the channels inside of the extruded profile.

A.A.A.$668

P R O C E S S F O R R E T O R T I N G O I L S H A L E W I T H M A X I M U M H E A T

R E C O V E R Y

Roland Deering assigned to Union Oil Com- pany of California

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