How do I choose a condenser size?

How do I choose a condenser size?

Condensing Units: how to choose and size

1. 1- First Step: Available Space. Studying and analyzing the available space is a very important point to choose the condensing units.
2. 2 – What is the capacity of the condensing unit?
3. 3 – Also select the CU application.
4. 4 – Power Supply and Starting Torque.

What is the condenser pressure of ammonia?

At 95oF condensing, the ammonia pressure is 181 psig, more than 100 psi less than what an air-cooled could provide on a 100oF day. The evaporative condenser can be seen to provide the lowest possible condensing pressures when considering the common cooling source as the local atmosphere.

What factors should be considered while selecting a condenser?

The principal factors involved in selecting a suitable type of condenser depends on whether condensation is total or partial, whether the vapors are single or multicomponent, and whether some components are noncondensable. The coolant can impose further restrictions, particularly if it vaporizes.

What is condenser capacity?

The condenser capacity is the ability of the condenser to transfer heat from the hot vapour refrigerant to the condensing medium.

How do you size a refrigeration condensing unit?

To find the right condensing unit: Box temperature minus split equals suction temperature. In our example, 40°F – 10°F = 30°F. The unit we want would be shown in a catalog rated at 49,473 BTU/Hr. at 30°F suction temperature.

How do you size a condensing unit to an evaporator?

HERE ARE SOME HELPFUL GUIDELINES WHEN SIZING.

1. SELECT CONDENSING UNIT WITH A LOWER CAPACITY THAN THE EVAPORATOR ( 90% to 100% OF EVAPORATOR )
2. DESIGN POINT – 38° SST (USE 40°F FOR SIZING PURPOSES) IF RUNNING ROOM AT 55°
3. GOLDILOCKS TYPE OF CONDITIONS. USE A GOOD AVERAGE TEMPERATURE NOT WORST CASE SCENARIO.

At what temperature does ammonia condense?

At atmospheric pressure, ammonia, NH3, is present as a liquid at temperatures below -33.6 °C (-28.5 °F). At 10 bara, the condensation/boiling point is 25 °C (77 °F). For more details about phase transitions, see ammonia phase diagram.

What suction pressure does an ammonia refrigeration system run at?

Typically, ammonia refrigeration systems can run at a discharge pressure of 95-100 psig for the highest efficiency. In this case the most savings results from a pressure of 128 psig. This could be due to a dirty or fouled condensing unit.

How do I choose a condensing unit?

This being a strategic choice, the condenser unit should consider the specifics from your project, the type of product you want to cool, your production volume, the space, and the outside temperature and climate and geographical conditions of your plant.

What is the basis for selecting the condenser for a refrigeration unit?

A condenser must be selected for the system’s total of heat rejection (THR), which is the sum of the heat energy absorbed by the evaporator and the additional heat energy added to the refrigerant by the compressor.

What are the factors affect condenser size?

By analyzing the heat transfer process of the air-cooled condenser, it is found that the temperature of the environment, the lateral wind speed in the environment and the rotational speed of the axial fan all have an influence on the condensation capacity of the air-cooled condenser.

How do I calculate BTU for refrigeration?

The load divided by the split will equal the evaporator size at 1°F TD. Using our example: 49,473 ÷ 10 = 4947 BTU at 1°TD. To find the right condensing unit: Box temperature minus split equals suction temperature.