How does the reversing valve switch a heat pump between heating and cooling modes?
a. It reverses refrigerant flow through the compressor.
b. It causes both check valves to allow refrigerant flow to the indoor coil.
c. It causes both metering devices to meter refrigerant.
d. It reverses refrigerant flow through the indoor and outdoor coils.
d
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Someone leaves a 100-W light bulb on before leaving and sealing up a 2 m x 4 m x 4 m room full of air. Initially the air temperature is 20oC, and the air pressure is 100 kPa. Assuming that the mass of the air in the room stays constant and ignoring any pressure changes
(a) determine the temperature of the air in the room after 8 hours. (b) What would the temperature of the room be after 8 hours if someone had also left a 50-W fan operating in the room at the same time? Given: Air; L = 4m; W = 4m; H = 2m; T1 = 20oC = 293 K; W?=?0.1 kW; P = 100 kPa; t = 8 hours Assume: Q = 0 (insulated); ?KE = ?PE = 0 Air behaves as an ideal gas with constant specific heats: cv = 0.718 kJ/kg-K R = 0.287 kJ/kg-K P = constant; m = constant What will be an ideal response?
Soil supplies anchorage, water, oxygen, and nutrients to plants
Indicate whether the statement is true or false.
Mom and Grandma are each baking chocolate chip cookies. Each gives you two cookies. One of Mom’s cookies has 14 chips in it and the other has 11. Grandma’s cookies have 6 and 8 chips.
a. Estimate the mean number of chips in one of Mom’s cookies. b. Estimate the mean number of chips in one of Grandma’s cookies. c. Find the uncertainty in the estimate for Mom’s cookies. d. Find the uncertainty in the estimate for Grandma’s cookies. e. Estimate how many more chips there are on the average in one of Mom’s cookies than in one of Grandma’s. Find the uncertainty in this estimate.
Explain how a centrifugal fan moves air
What will be an ideal response?