Heat exchanger 40 in this embodiment is {HEAD ~ a thermoelectric cooler} capable of pumping {TAIL ~ heat} from a cool side to a hot side of the device 
Heat exchanger 40 in this embodiment is { HEAD ~ a thermoelectric cooler } capable of pumping { TAIL ~ heat } from a cool side to a hot side of the device
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH