How do you size an evaporator?

If the evaporator must move 400 gallons per minute: 14 x 400 = 5,600. Multiply the answer by 500: 5,600 x 500 = 2,800,000. This answer is the evaporator’s size, measured in BTUs per hour. Divide the answer by 12,000: 2,800,000 / 12,000 = 233.33.

Capacity of evaporator is defined as the number of kilograms of water vaporized/evaporated per hour. The rate of heat transfer Q through the heating surface of evaporator is the product of heat transfer coefficient, heat transfer surface area and the overall temperature drop.

how do I size a condenser unit? How to Determine a Condensing Unit Size

  1. Find the air conditioner’s condensing unit outside the home.
  2. Look on the exterior of the condensing unit for its data plate.
  3. Find and record the compressor’s rated load amperage (RLA).
  4. Divide the RLA by 5 if it’s a newer unit.

Moreover, how can you tell what size your AC unit is?

To calculate the size, simply multiply the length times the width of the room or area to be cooled. Then, as a practical number, multiply that total times 25 BTU. This allows ample cooling, whether it is a rainy, moist day or a hot, sunny, humid day. Let’s say the room is 12 feet wide by 15 feet long.

How do you check pressure drop across a coil?

Drill a test hole into the duct or equipment on the leaving air side of the coil. This will be your pressure measurement after the coil as the air leaves the coil. Once again, look before you drill. the static pressure tips into the airflow (remember you are measuring static pressure).

How do you measure fins per inch?

Fins are measured in fins per inch. Hold a tape measure up to the coils and count the number of fins in one inch. If you can’t get in to take the measurement, a safe rule of thumb is 10-12 fins/inch.

How do you measure the temperature drop across an evaporator coil?

Begin by running the air conditioning for at least 15 minutes before measuring the temperature drop. It takes at least this long for the system to stabilize. The best way to get an accurate temperature drop measurement is to insert a probe-type thermometer as close as possible to each side of the evaporator coil.

How many types evaporator?

Evaporator Types. The two general types of evaporators used in today’s refrigeration systems are flooded evaporators and dry, or direct expansion (DX), evaporators.

What is the principle of evaporator?

The evaporator works the opposite of the condenser, here refrigerant liquid is converted to gas, absorbing heat from the air in the compartment. When the liquid refrigerant reaches the evaporator its pressure has been reduced, dissipating its heat content and making it much cooler than the fan air flowing around it.

What is the difference between evaporator and condenser?

The evaporator coil contains cold refrigerant that absorbs heat from your air. The condenser coil is where the refrigerant goes to get rid of this heat so it can can come back to absorb more. The evaporator coil is located indoors, inside or near your air handler.

How does multiple effect evaporator work?

Multiple Effect Evaporator. The multiple-effect configuration combines two or more evaporator bodies to conserve steam, which is condensed in the first-effect heat exchanger only. For the same overall pressure differential and process conditions, the evaporator with more effects will require less steam.

How does a thin film evaporator work?

In a wiped film evaporator or a thin film evaporator, a rotating wiper system distributes the crude product to a film on the inner surface of a heated pipe. The wiping system speeds up the evaporation process by keeping the product film turbulent so that the heat transfer and mass transfer are optimized.

What is the function of an evaporator?

Evaporator. Evaporator is an important component together with other major components in a refrigeration system such as compressor, condenser and expansion device. The reason for refrigeration is to remove heat from air, water or other substance. It is here that the liquid refrigerant is expanded and evaporated.

What is single effect evaporator?

In a single-effect evaporator, steam provides energy for vaporization and the vapor product is condensed and removed from the system. In a multiple effect arrangement, the latent heat of the vapor product off of an effect is used to heat the following effect.

What is the economy of an evaporator?

AND ECONOMY) Economy (or steam economy) is the number kilogram of water vaporized from all the effects per kilogram of steam used. For single effect evaporator, the steam economy is about 0.8 (<1). The capacity is about n-times that of a single effect evaporator and the economy is about 0.8n for a n-effect evaporators.

What is natural circulation evaporator?

Natural circulation in an evaporator is caused by the thermal difference between the heating medium and the liquid. The mixture of vapor and liquid merges from the tubes and enters the upper chamber from which it passes through a short connection into the vapor separator.

How many BTU do I need for a 12×12 room?

2. Find the correct cooling capacity for your room size Area To Be Cooled (square feet) Capacity Needed (BTUs per hour) 100 up to 150 5,000 150 up to 250 6,000 250 up to 300 7,000 300 up to 350 8,000

How many BTU do I need per square foot?

Multiply your square footage by 20 BTUs to get a general estimate. Typically, plan to purchase a heating or cooling unit with 20 BTUs for every square foot of space you have.