Air conditioner condensate

Every house has some minimum penetration through the slab or foundation walls. The ones always present are water pipe entry and sewer pipe exit. Common additional penetrations are floor drains, sump holes, and air conditioner condensate drains. 

Air conditioner condensate lines are sometimes installed so that they penetrate the slab to dispose of the water in the subslab area. Even when water is trapped, this can be a problem because the traps often dry up during the heating season. At this point they become radon entry routes. It is recommended that air conditioning condensate lines run to a drain that will not dry out or that a condensate pump is installed that collects the condensate and disposes of it through a water trap. Often a washing machine drain is located in a basement near enough to use it. 

An air conditioner condenser in an automobile consists of 2 of tubular heat exchange area whose surface temperature is SOT. Saturated refrigerant-134a vapor at S0°C hjf = 152 kJ/kg) condenses on these tubes. What heat transfer coefficent must exist between the tube surface and condensing vapor to produce 1.5 kg/min of condensate ... 

What information is contained in a measurement of pH What can a measurement of pH tell about the biological state of blood, wastewater, food, groundwater, rain, bioreactor medium, air conditioner condensation, and gel for growth of microbes ... 

Methane excretion was not affected by diet, but methane excretion per kg DMI and per kg milk yield were greater when the GS diet was fed. There was no emission of N2O from the chambers, and on average there was a net uptake of 88 mg N2O N/d from incoming air. Emission of NHj in exhaust air increased linearly with increasing dietary protein concentration and NH3 in air conditioner condensate was greater for GS diets. 

These mechanisms can be observed in many common situations. For example, fog via mixing can be seen in the discharge of breath on a cold day. Fog via adiabatic expansion can be seen in the low-pressure area over the wing of an airplane landing on a humid summer day and fog via condensation can be seen in the exhaust from an automobile air conditioner (if you follow closely enough behind another car to pick up the ions or NO molecules needed for nucleation). All of these occur at a veiy low supersaturation and appear to be keyed to an abundance of foreign nuclei. All of these fogs also quickly dissipate as heat or unsaturated gas is added. 

Room air conditioner (self-contained) A rcxjm air conditioner complete with a direct expansion (dx) system condenser and evaporator fans, filtration, and thermostatic control. 

Fin spacing will be a compromise between compactness (and cost) and the tendency for the interfm spaces to block with condensed moisture or frost. Spacings will vary from 2 mm on a compact air-conditioner to 12 mm on a low-temperature coldroom coil [8]. 

Winter heating items fitted within room air-conditioners may be electric resistance elements, hot water or steam coils, or reverse cycle (heat pump). One model of water-cooled unit operates with a condenser water temperature high enough to be used also in the heating coil. 

The usual split package air-conditioner comprises one condensing unit connected by pipes to one evaporator unit (Figure 13.4). Twin condensing units are made to save on outdoor casings and reduce the number of pieces on a roof or wall. Such twins will be connected in the usual way to two separate indoor units. 

The catalogue-rated cooling capacity of a room air-conditioner, if not qualified, will be based on ASHRAE Standard 16-1983. This specifies test conditions of air onto the evaporator at 80°F dry bulb, 50% relative humidity (26.7°C, 49.1% saturation), and air onto the condenser at 95°F dry bulb, 75°F wet bulb (35°C and 23.9°C). The original basis for this specification was the ambient condition prevailing in the mass-market area of the USA. 

Traditional air conditioners use a continuous cycle of evaporation and condensation to remove heat from a room and blow it outside. To cool the air, a part of the air conditioner contains a gas that naturally evaporates at cold temperatures. This gas is called a refrigerant. The refrigerant flows continuously through three parts of the appliance that change its state of matter from liquid to a gas and back. These parts are a condenser, an evaporator, and a compressor. 

In the condenser, the refrigerant changes from a gas to a liquid. This process produces heat, which is usually blown with a fan out the back of the air conditioner to the outside. The purpose of this phase change is to supply the air conditioner with liquid. 

Finally, the refrigerant gas returns to the condenser through a compressor. The compressor pumps the gas back to the condenser so that the process is continuous. Although a lot happens inside an air conditioner, it is all relatively simple science and requires little maintenance. 

Figure 8.1 Air conditioners use the principles of evaporation and condensation to cool rooms.

There is no need for the condensation part of the cycle because hot air is in continuous supply on warm days. As a result, evaporative coolers use far less energy than traditional refrigerated air conditioners. They are very popular in hot, dry areas of the country where coolers are used nearly year-round. 

A refrigerator works almost exactly like an air conditioner. It uses a condenser, compressor, and evaporator to continuously change the state of matter of a refrigerant gas. 

The condenser on a certain automobile air conditioner is designed to remove 60,000 Btu/h from Freon 12 when the automobile is moving at 40 mi/h and the ambient temperature is 95°F. The Freon 12 temperature is 150°F under these conditions, and it may be assumed that the air-temperature rise across the exchanger is 10°F. The overall heat-transfer coefficient for the finned-tube heat exchanger under these conditions is 35 Btu/h ft2 - °F. If the overall heat-transfer coefficient varies as the seven-tenths power of velocity and air-mass flow varies directly as the velocity, plot the percentage reduction in performance of the condenser is a function of velocity between 10 and 40 mi/h. Assume that the Freon temperature remains constant at 150°F. 

Fresh air containing 4.00 mole% water vapor is to be cooled and dehumidified to a water content of l.70mole% H2O. A stream of fresh air is combined with a recycle stream of previously dehumidified air and passed through the cooler. The blended stream entering the unit contains 2.30 mole% H O. In the air conditioner, some of the water in the feed stream is condensed and removed as liquid. A fraction of the dehumidified air leaving the cooler is recycled and the remainder is delivered to a... 

In the air conditioner, the air is cooled to a temperature low enough to condense the necessary amount of water and reheated to 55 F, at which point it has the same absolute humidity as the room air. Use the psychrometric chart to estimate the rate (lbn,/min) at which water is condensed, the temperature to which the air must be cooled to condense water at this rate, and the net tons of cooling required (0, where 1 ton of cooling = -12,000Blu/h. [Nore The humid volume of the delivered air (at 55°F), which is difficult to read from the psychrometric chart, is 13.07 ft /lbm dry air, and the heat capacity of liquid water is 1.0 Btu/(lbm- F).]... 

The recycle ratio (ft recircu ated/ft exhausted) is 6 1. Calculate the condensation rate and the overall cooling requirement in tons if conditioned air is delivered at the same rate, temperature, and relative humidity as in part (a). What percentage of the cooling load on the air conditioner is saved by recirculating the air Explain in your own words why the cooling rate is lower when room air is recirculated instead of bringing all the air in from the outside. 

Cross-flow over tube banks is commonly encountered in practice in heal transfer equipment such as the condensers and evaporators of power plants, refrigerators, and air conditioners. In such equipment, one fluid moves through the tubes while the other moves over the tubes in a perpendicular direction. 

Often this quantity is multiplied by 100 to give the percent relative humidity. Suppose the percent relative humidity is 80.0% at91.4°F (33.0°C) in a house with volume 245 m. Then an air conditioner is mrned on. Due to the condensation of water vapor on the cold coils of the air conditioner, water vapor is also removed from the air as it cools. After the air temperature has reached 77.0°F (25.0°C), the percent relative humidity is measured to be 15.0%. (a) What mass of water has been removed from the air in the house Reminder Take into account the difference in saturated water vapor pressure at the two temperamres.) (b) What volume would this liquid water occupy at 25°C (Density of hquid water at 25.0°C = 0.997 g/cmL)... 

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