What does it mean if the maxiumum thermal resistance require

What does it, mean if the maxiumum thermal resistance required of a nest sink is negative in vlaue?

Solution

A heatsink which can manage 0°C/W, and lesser values i.e. the heatsink that needs a negative thermal resistance is called a heat pump, and the most common example is an air conditioner or refrigerator. Peltier devices (hot/cold junction semiconductors) can be used, but tend to be expensive, and require a fairly heavy current. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, depending on the direction of the current. Such an instrument is also called a Peltier device, Peltier heat pump, solid state refrigerator, or thermoelectric cooler.

A heat pump is a device that provides heat energy from a source of heat to a destination called a \"heat sink\". Heat pumps are designed to move thermal energy opposite to the direction of spontaneous heat flow by absorbing heat from a cold space and releasing it to a warmer one. A heat pump uses some amount of external power to accomplish the work of transferring energy from the heat source to the heat sink.

Working:

Heat pumps transfer heat by circulating a substance called a refrigerant through a cycle of evaporation and condensation. A compressor pumps the refrigerant between two heat exchanger coils. In one coil, the refrigerant is evaporated at low pressure and absorbs heat from its surroundings. The refrigerant is then compressed and route to the other coil, where it condenses at high pressure. At this point, it releases the heat it absorbed earlier in the cycle.