Air Conditioner Design Temperature

Design grains 55 rh indoor air at 75 f drybulb and 55 relative humidity design grains 50 rh indoor air at 75 f drybulb and 50 relative humidity.

Air conditioner design temperature.

Mean coincident dry bulb temperature f cooling degree days base 65 f f day 99 dp hr mcdb dp hr mcdb 5. Wind speed mph mcwb. Wet bulb temperature f dp. Mean coincident wet bulb temperature f mcdb.

Of dry air at entering condition grains of water lb. The minimum temperature can vary between models but it is usually around 60 degrees f. If the 1 summer design temperature is 91 f as in atlanta a manual j report showing that the load calculation was done with 97 f will result in an oversized air conditioner. Of dry air at indoor design conditions grains of water lb.

The air conditioner is designed to manipulate the properties of the refrigerant between a gas and liquid. Of dry air at leaving condition grains of water lb. Air conditioners are designed to lower the temperature of your home s air by about 20 degrees. Humidity ratio grains of moisture per lb of dry air ws.

But in reality this is a question that doesn t have a one size fits all answer. Dry bulb temperature f wb. According to the department of energy 1 78 fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling. The refrigerant selection and part designs assume that the air conditioner would never run below a certain temperature.

High temperature refrigeration equipment refers to cooling equipment that operates typically in the 25 degf to 45 degf such as air conditioning systems. So if the air in your home is 85 degrees for example your air conditioner can lower your air s temperature to about 65 degrees. Medium temperature refrigeration equipment refers to cooling equipment that operates typically in the range of 0 degf to 25 degf such as a food freezer or refrigerator. Get your equipment sized for design loads not extreme loads.

Indoor design temperature outdoor design temperature grains of water lb. Negative values occur when the outdoor air is dryer than the indoor air. A series of psychological experiments by the society of heating refrigerating and air conditioning engineers ashrae showed that people have been acculturated to believe that 72 f 22 2 c is the optimum comfortable room temperature. Of dry air at outdoor design conditions the air constants below apply specifically to standard air which is.

This means that it is 80 outside your ac can easily reach 70 degrees since that is only a 10 degree temperature difference.