Heat exchanger

A heat exchanger comprising:

• a first reservoir;
• a second reservoir spaced from the first reservoir;
• and
• at least one heat transfer tube having a wall with a uniform thickness over an entire length thereof, said tube having first and second tapered end portions, each tapered end portion having a diameter that decreases at a constant rate from the diameter of said central portion to a smaller diameter at an end surface thereof, each of the first and second reservoirs comprising a side wall and at least one tapered tubular portion integral with and extending outwardly from the side wall with an increasing diameter, the first tapered end portion being inserted into the at least one tapered tubular portion of the first reservoir, the second tapered end portion being inserted into the at least one tapered tubular portion of the second reservoir.

A heat exchanger comprising:

• two or more reservoirs spaced vertically apart from each other, at least one of said reservoirs comprising a side wall defining an interior, and at least one tubular portion extending outwardly from said side wall;
• and
• a plurality of heat transfer tubes each having a wall with a uniform thickness over an entire length thereof, said tubes fluidly connecting said reservoirs, each of said plurality of heat transfer tubes having a central portion with a constant diameter and an end portion inserted into said at least one tubular portion so that said end portion does not project into the interior of said at least one of said reservoirs, said end portion being coextensive with said side wall,
• said end portion having a diameter that decreases at a constant rate from the diameter of said central portion to a smaller diameter at an end surface of said end portion.