In an air conditioning system, cold air mixes with hot outdoor air before being routed to a room. cold air enters the mixer at 275 k at a rate of 7 kg/s and hot air enters the mixer at 315 k at a rate of 2 kg/s. the entire system is operated at 105 kpa. the air temperature leaving the mixer is 300 k.

a. find the rate of heat transfer to the mixer from the environment in kw.
b. if the maximum air speed in the ducts is 2 m/s, what should the cross-sectional area be for each of the three ducts (hot input, cold input, and exit)?

Asystematic approach to problem solving is called a (an)

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Energy can be transformed from one form to another. the diagram shows one such process. which energy transformation is represented in the diagram? nuclear to thermal and radiant nuclear to electrical and chemical chemical to nuclear and radiant chemical to electrical and nuclear