An improved indirect heat exchanger including a plurality of coil circuits, with each coil circuit comprised of an indirect heat exchange section tube run or plate. Each tube run or plate has at least one change in its geometric shape or may have a progressive change in its geometric shape proceeding from the inlet to the outlet of the circuit. The change in geometric shape along the circuit length allows simultaneously balancing of the external airflow, internal heat transfer coefficients, internal fluid side pressure drop, cross sectional area and heat transfer surface area to optimize heat transfer.

A heat pipe assembly comprises a female heat pipe comprising at least one open end; and at least one male heat pipe. The at least one male heat pipe includes an inserting end where the inserting end of the at least one male heat pipe is able to be movably inserted into an open end of the female heat pipe. An electronic device using the heat pipe assembly is also provided.

A furnace assembly for use with a gas fuel that includes a cabinet and a burner located in the cabinet that is operable to ignite the gas fuel. The furnace also includes a heat exchanger assembly in communication with the burner and open to receiving the ignited gas fuel, the heat exchanger assembly including tubes. Each tube includes a first section with an inlet, a horizontal section having a first internal diameter, and a vertical section. Each tube also includes a second section extending from the first section and having a second internal diameter less than the first internal dimeter. The second section also includes a serpentine flow path up and down in the vertical direction and an outlet. The gas fuel entering a tube stays in the tube until flowing out of the tube. The furnace also includes a blower operable to move air through the cabinet and over the heat exchanger assembly.

At least some aspects of the present disclosure feature a tubular convective device, comprising: a blown film forming a tube when inflated, the blown film having a first portion and a second portion, wherein the first portion and the second portion are separated longitudinally, and a plurality of apertures disposed on the first portion of the blown film. At least some aspects of the present disclosure feature a tubular convective system including a plurality of tubular convective devices, where adjacent tubular convective devices are connected.

At least some aspects of the present disclosure feature a tubular convective device, comprising: a blown film forming a tube when inflated, the blown film having a first portion and a second portion, wherein the first portion and the second portion are separated longitudinally, and a plurality of apertures disposed on the first portion of the blown film. At least some aspects of the present disclosure feature a tubular convective system including a plurality of tubular convective devices, where adjacent tubular convective devices are connected.

A heat dissipation module used for an electronic device is provided. The electronic device has a heat source. The heat dissipation module includes an evaporator, a pipe, and a working fluid. The evaporator has a recess at an exterior surface thereof, and is thermally contacted with the heat source to absorb heat generated from the heat source. The pipe is connected to an inner space of the evaporator and forms a loop. The working fluid is filled in the loop, wherein the working fluid in liquid passes through the evaporator, absorbs heat, and is transformed into vapor to flow out of the evaporator.

A method of assembling a heat exchanger includes the steps of fluidly connecting a plurality of first heat exchanger tubes to a first connecting tube portion at an assembly location to form a first subassembly, fluidly connecting a plurality of second heat exchanger tubes to a second connecting tube portion at the assembly location to form a second subassembly, transporting the first subassembly and the second subassembly from the assembly location to an installation location, and connecting the first subassembly to the second subassembly at a single connection point between the first connecting tube portion and the second tube connecting portion.

A method of assembling a heat exchanger includes the steps of fluidly connecting a plurality of first heat exchanger tubes to a first connecting tube portion at an assembly location to form a first subassembly, fluidly connecting a plurality of second heat exchanger tubes to a second connecting tube portion at the assembly location to form a second subassembly, transporting the first subassembly and the second subassembly from the assembly location to an installation location, and connecting the first subassembly to the second subassembly at a single connection point between the first connecting tube portion and the second tube connecting portion.

A heat exchanger for heating a liquid is provided, in particular, for high-pressure cleaners, including an inner and an outer heating coil which each have a plurality of turns, and including spacers which are arranged between the inner heating coil and the outer heating coil and are distributed over the circumference of the inner heating coil. To develop the heat exchanger in such a way that it can be manufactured more cost-effectively and is highly efficient, at least one turn of the outer heating coil includes between two spacers immediately adjacent to each other a first turn section in which the radial spacing from the inner heating coil is smaller or larger than in the region of the spacers. Two methods for manufacturing such a heat exchanger are also provided.

A heat exchanger for heating a liquid is provided, in particular, for high-pressure cleaners, including an inner and an outer heating coil which each have a plurality of turns, and including spacers which are arranged between the inner heating coil and the outer heating coil and are distributed over the circumference of the inner heating coil. To develop the heat exchanger in such a way that it can be manufactured more cost-effectively and is highly efficient, at least one turn of the outer heating coil includes between two spacers immediately adjacent to each other a first turn section in which the radial spacing from the inner heating coil is smaller or larger than in the region of the spacers. Two methods for manufacturing such a heat exchanger are also provided.