Heat exchange systems with fluid intake control and associated methods

An aircraft system comprising:

• a conduit to carry a first fluid, the conduit including a first portion and a second portion fluidly in parallel with the first portion;
• a heat exchanger operatively coupled to the conduit, the heat exchanger to cause the first fluid to exchange thermal energy with a second fluid;
• and
• a fan positioned in the first portion of the conduit, wherein a rotation of the fan causes the first fluid to flow past the fan in the first portion of the conduit during first operations, and wherein the first fluid flows in the second portion of the conduit during second operations.

An aircraft system comprising:

• means for carrying a first fluid, the means for carrying including a first portion and a second portion distinct from the first portion, wherein the second portion of the means for carrying is fluidly in parallel with the first portion;
• means for causing the first fluid to exchange thermal energy with a second fluid;
• means for pulling the first fluid through the first portion of the means for carrying;
• and
• means for directing the first fluid, wherein the means for directing the first fluid directs the first fluid into the first portion of the means for carrying during first operations, and wherein the means directing the first fluid directs the first fluid into the second portion of the means for carrying during second operations distinct from the first operations.