Compute the specific volume of an air-vapor mixture in cubic meters per kilogram of dry air when the following conditions prevail : t = 30°C, w = 0.015 kg/kg, and Pr = 90 kPa.

Compute the humidity ratio of alr considering the density at 35°C and 101 kPa Is 1.05 kg/m3

A coil has an inlet temperature of 60°F and outlet of 90°F. If the mean temperature of the coll is 110°F, find the bypass factor of the coil

Compute the pressure drop of 30°C alr flowing with a mean velocity of 8 m/s In a circular sheet-metal duct 300 mm in dlameter and 15 m long, Use a friction factor, f = 0.02, and pair = 1.1644 kg/m3.

A pressure difference of 350 Pa Is avallable to force 20°C air through a circular sheet-metal duct 450 mm in dlameter and 25 m long, At 20°C, p = 1.204 kg/m' and take friction factor, f = 0.016. Determine the velocity,

A duct 0.40 m high and 0.80 m wide suspended from the celling in a corridor, makes a right angle turn In the horizontal plane. The Inner radius is 0.2 m and the outer radius is 1.0 m measured from the Same center. The velocity of air in the duct Is 10 m/s. Compute the pressure drop In this elbow, Assuming; f = 0.3, p = 1.204 kg/m3 and L = 10 m.

A rectangular duct has a dimensions of 0.25 m by 1 m. Determine the equivalent diameter of the duct.

Find the amount of electrical energy expended raising the temperature of 45 liters of water by 75°C. Assume the efficiency of the heating equipment to be 90% ?

To what height will a berometer column rise If the atmospheric conditions are 13.9 psia and 68°F and barometer fluld is mercury?

To what height will a barometer column rise If the atmospheric conditions are 13.9 psia and 68°F and barometer fluld Is ethyl alcohol? Note: @ 68°F; Pv = 122.4 Ibf/ft? and specific gravity of 0.79 for ethyl alcohol.

To what height will 68°F ethyl alcohol rise in a 0.005 inch internal diameter glass capillary tube? The density of alcohol is 49 Ibm/ft3 where: B = 0° = contact angle and surface tension = 0.00156 Ibf/ft @ 68°F.

What is the velocity of sound In 150°F ( 66°C) air at a standard pressure? Note: density of alr @ 150°F Is 0.064 Ibm/ft*

What is the pressure 8000 ft below the water surface of the ocean? Neglect compressibility.

If atmospheric alr 14,7 psia and 60°F at sea level, what Is the pressure at 12000 ft altitude If alr is Incompressible. Note: @ 60°F the density of alr is 0.0763 Ibm/f; Py = 14.7 psla

If atmospheric air 14.7 psia and 60°F at sea level, what is the pressure at 12000 ft altitude If air Is Incompressible. Note: @ 60°F; the density of air is 0.0763 Ibm/ft; Pi = 14.7 psia

A cylindrical 1 ft dlameter, 4 ft high tank contains 3 ft of water. What rotational speed is required to spin water out the top?

Water (p = 62.4 Ibm/ft*) is flowing through a plpe. A pltot-statlc gage registers 3.0 Inches of mercury. What Is the velocity of the water In the pipe? Note: PHe = 848.6 1bm/#ta

A two-pass surface condenser Is to be designed using overall heat transfer coefficient of 480 Btu/°F-ft? of outside tube surface. The tubes are to be 1 inch outside dlameter with 1/16 In walls (or 7/8 in. inside diameter). Entering circulating water veloclty is to be 6 ft/s. Steam enters the condenser at a rate of 100,000 lb/hr at a pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate leaves at saturated liquid at one psla, Circulating water enters the condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia condensate has temperature of 101,7 deg. F. Wet steam entering becomes condensate at 101.7 deg. F with hf = 69.72 Btu/b, Calculate the total number of tubes to be used In each pass.

A two-pass surface condenser Is to be designed using overall heat transfer coefficient of 480 Btu/°F-ft? of outside tube surface. The tubes are to be 1 inch outside dlameter with 1/16 In walls (or 7/8 in. inside diameter). Entering circulating water veloclty is to be 6 ft/s. Steam enters the condenser at a rate of 100,000 lb/hr at a pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate leaves at saturated liquid at one psla, Circulating water enters the condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia condensate has temperature of 101,7 deg. F. Wet steam entering becomes condensate at 101.7 deg. F with hf = 69.72 Btu/b, Calculate the total length of tubes to be used In ft

A two-pass surface condenser Is to be designed using overall heat transfer coefficient of 480 Btu/°F-ft? of outside tube surface. The tubes are to be 1 inch outside dlameter with 1/16 In walls (or 7/8 in. inside diameter). Entering circulating water veloclty is to be 6 ft/s. Steam enters the condenser at a rate of 100,000 lb/hr at a pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate leaves at saturated liquid at one psla, Circulating water enters the condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia condensate has temperature of 101,7 deg. F. Wet steam entering becomes condensate at 101.7 deg. F with hf = 69.72 Btu/b, Calculate the total length of tubes to be used In ft per cube

A 0.30 x 0.40 m branch duct leaves a 0.30 x 0.60 main duct at an angle of 60°. The air temperature is 20°C. The dimensions of the main duct remain constant following branch. The flow rate upstream Is 2.7 mª/s. What is the pressure downstream In the main-duct, Note: at 20°C, p= 1.2041 kg/m.

A sudden enlargement In a circular duct measures 0.20 m diameter upstream and 0.40 m downstream. The upstream pressure Is 150 Pa, downstream pressure is 200 Pa. What Is the flow rate of 20°C air through the fitting? Use p = 1.02041 kg/m'.

Determine the sensible heat of 5 lb of alr having a dry bulb temperature of 70°F and a humidity ratio of 0.0092 lb/lb, the latter corresponding to a dew point temperature of approximately 55°F.

Determine the approximate load on a cooling tower If the entering and leaving temperatures are 96°F and 88°F, respectively and the flow rate of the water over the tower is 30 gpm.

Determine the quantity of water lost by bleed off If the water flow rate over the tower Is 30 gpm and the range Is 10°F. Percent bleed-off required is 33%.

The mass of an outside air at 50°C in an air conditioning unit is 60 kg. Ifnd the temperature after mixing If the outside air mixed with 40 kg with recirculated air at 35°C.

A creamery must cool 20,000 Ilters of milk received each day from initial temperature of 29°C to a final temperature of 2°C in 5 hours. If refrigeration losses amount to 10 percent of the cooling load, what must be the capacity of the refrigerating machine? Note: Specific heat of milk if 3.9 kJ/kg-K and S.G. = 1.05.

How many tons of refrigeration are required to produce 10 metric tons of ice per day at -10°C from raw water at 22°C if miscellaneous losses are 15% of the chilling and freezing load?

Five hundred kilograms of poultry enter a chiller at 8°C and are frozen and chilled to a final temperature of -18°C for storage in 15 hours. The specific heat above and below freezing are 3.18 kJ/kg°C and 1.55 kJ/kg°C respectively. The latent heat is 245 kJ/kg and the freezing temperature is -5°C. Compute the product load.

Fish weighing 11,000 kg with a temperature of 20°C is brought to a cold storage and which shall be cooled to -10°C in 11 hours. Find the required plant refrigerating capacity In tons of refrigeration if the specific heat of fish os 0.7 kCal/kg°C above freezing and 0.30 kCal/kg°C below freezing point which is -3°C. The latent heat of freezing Is 55.5 kCal/kg.

Mass of ice at -4°C is needed to cool 115 kg of vegetables in a bunker for 24 hours. The Initlal temperature of vegetables is assumed to be 30°C. It Is also assumed that the average temperature inside the bunker is 7° within 24 hour period, If the heat gained per hour in the bunker Is 30% of the heat removed to cool the vegetable from 30°C to 7°C, what would be the required mass of Ice ? Note: Speclfic heat of ice s 1.935 kJ/kg-K Specific heat of vegetables = 3.35 kJ/kg-K Specific heat of water = 4.186 kJ/kg-K Heat of fusion of ice = 335 kJ/kg

A refrigerator Is 2 m high, 1.2 m wide and 1 m deep, The over-all heat transfer coefficient is 0.532 W/m °C. How many kllograms of 0°C Ice will melt per hour If the inside temperature Is maintained at 10°C while the surrounding air temperature is at 35°C ?

The power requirement of a Carnot refrigerator In maintaining a low temperature region at 300 K is 1.5 kW per ton. Find the heat rejected.

A vapor compression refrigeration system is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22°C to 2°C. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise at 10C