Air conditioner problem... Freon R-22
Determine the actual cooling rate of the unit.
Calculate the rate of heat loss from the air.
-----Pressure (psig)----Temperature (F) ---- Enthalpy (Btu/lbm)
A -- 170 ---------------------- 88 -------------------- 36.345
B -- 113 ---------------------- 64 -------------------- 123.642
C -- 66 ------------------------ 57 -------------------- 110.9135
D -- 172 ---------------------- 150 ------------------ 123.6425
0.4 gallons per minute
Air inlet = 75.7F
Air Outlet = 44F
Average velocity = 1000fpm
Area = 0.47ft2
Given Equations
Qdot = m22dot (hc - hb)
ŋ = Qair / Q22
Q = mdotCpΔT
I have a few equations given, but not sure where to look for the values... for example Qdot = mdot (hc-hb)... how do I find mdot?
2007-11-26 05:59:04 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Approximate answers is...
heat-pickup = 18,000 Btu/hr
cooling = 17,000 Btu/hr
2007-11-26 06:03:05 · update #1
mdot is just the mass, of the air and of the freon.
For the air:
The mass of the air that flows thru the system in one hour (lbs)= velocity (1000 ft/min) x 60 min/hr x Area (0.47 ft^2) x weight of 1 cu.ft. of air at the given temp and pressure. (calculate it).
Cp = specific heat at constant pressure
(hc - hb) = enthalpy change of one pound of the substance.
For the freon:
Do something similar, but it is your homework.
2007-11-26 10:22:45 · answer #1 · answered by gatorbait 7 · 0⤊ 0⤋
they are 24K BTU, R-22, and characteristic compatibility. regardless of the actuality that the condensing unit is rated thirteen SEER, the performance would be no longer extra suitable than the indoor coil, which seems to be 10 SEER. you may desire to make particular you have the the appropriate option piston length interior the Flowcheck metering gadget on your utility. probable #fifty nine.
2016-12-30 04:47:54 · answer #2 · answered by domnick 3 · 0⤊ 0⤋