Table of Contents
What is approach in refrigeration?
The approach is simply how many degrees warmer the liquid line leaving the condenser is than the air entering the condenser. The difference in temperature between the liquid line and the outdoor temperature can help illustrate the amount of refrigerant in a system and the efficiency of the condenser coil.
What is a approach temperature?
What is “Approach Temperature”? This term refers to the temperature difference between the leaving process fluid and the entering service fluid. If air is cooled from 300 F to 100 F using 90 F cooling water, the air temperature approaches the water by 10 F (100 – 90 = 10).
What is evaporator approach?
Evaporator approach is the difference between evaporating temperature measured at the well in the evaporator, and leaving chilled water temperature. Evaporator approach can be used to evaluate the refrigerant charge. In a 1 pass evaporator, approach should be 10° to 14°.
What is chiller approach value?
Approach Temperature & Condenser Approach: A condenser approach temperature is a difference between liquid refrigerant temperature as measured on the liquid line, and leaving condenser water temperature. Generally, the condenser approach for a water-cooled chiller will be in the range of 0 to 4 degrees.
What is chiller evaporator approach?
Evaporator approach is the difference between evaporating temperature measured at the well in the evaporator, and leaving chilled water temperature. In a 2 pass evaporator, approach should be 7° to 10°. In a 3 pass evaporator, approach should be 3° to 6°. Take all readings with the water cooled chiller at full load.
What is the minimum approach temperature?
The minimum approach temperature represents the smallest gap in temperature across which heat transfer will occur in the system. This often only occurs at the pinch. While technically any value greater than zero can allow for heat transfer, very small values are not often feasible.
Why is chiller approach important?
In many facilities, chiller and condenser systems are the largest energy consuming component of the plant. Operating a chiller at its peak performance saves energy, as well as maintenance costs, and can keep the facility’s loads properly maintained.
How is chiller condenser approach calculated?
To calculate the condenser approach temperature, first obtain the temperature of the Freon refrigerant condensing temperature found on the lower shell side of the condenser heat exchanger. Next, read the temperature of the cooling water that leaves the condenser and returns to the cooling tower.
What is approach in a cooling tower?
ii) “Approach” is the difference between the cooling tower outlet cold water temperature and ambient wet bulb temperature. Although, both range and approach should be moni- tored, the ‘Approach’ is a better indicator of cooling tower performance.
What is COP for chiller?
Calculating the efficiency of a chiller is fairly simple. It is measured in “COP” which stands for Coefficient Of Performance. The Coefficient of performance is just a ratio of the refrigeration effect produced by the chiller against the amount of electrical energy that went into the machine to produce this.
What is DX chiller?
DX is short for Direct Expansion which means that the refrigerant expands (produces the cooling effect) in a coil that is in direct contact with the conditioned air that will be delivered to the space. Chillers and DX units are the two main type of equipment used for air conditioning.