What is the formula for condenser efficiency?

Performance of the condenser is analyzed based on logarithmic mean temperature difference (LMTD) method. Based on LMTD, the heat transfer equation can be expressed as in Eq. (1),(1) Q = k A ( d T m ) where k, heat transfer coefficient; A, tube surface area; Q, heat transfer rate.

What is the height of barometric type of condenser?

As 1″ of Hg equals 1.133 feet of water, a minimum barometric leg of 29.5 feet is required. Note that this is the ‘minimum’ barometric leg height. It’s normally recommended that a 34 foot barometric leg be provided which allows the system to pull a pure vacuum and still allows the water and condensate to drain freely.

What is the approximate height of tail pipe in barometric condenser?

The tail-pipe should immerse in the hot-well not less than 12 inches from the hot-well bottom and also no less than 12 inches under the water level. The hot-well capacity should not be less than 1.5 times the volume of the water column in the tail-pipe.

How do you evaluate the performance of a condenser?

Comprehensive Condenser Performance Analysis

  1. Step 1: Basic Evaluation – Plant Data & Drawing Review.
  2. Step 2: Condenser Inspection and Instrumentation.
  3. Step 3: Advanced Performance Evaluation – Problem Analysis and Economic Impact.
  4. Step 4 – Performance Improvement Plan including Engineering Design, Modeling, and Support.

How do you calculate barometric legs?

Just locate the Condenser a suitable distance above the Receiver, and the water will flow downhill against the pressure difference. The calculation of what constitutes a “suitable distance” is what you call “calculate barometric leg”, since the piping between the Condenser and the Receiver is called the barometric leg.

What is barometric condenser?

Barometric condensers are utilized to desuperheat and condense the incoming vapors plus cool the exiting gases, while developing the lowest possible pressure. 1.2 Design Description. There are two principal types of condensers, namely counter flow and parallel flow.

Which condenser is also called barometric condenser?

high level counter flow type jet condenser
Which of the following condensers is also called barometric condenser? Explanation: A high level counter flow type jet condenser is also called as barometric condenser.

How do you calculate condenser cleanliness factor?

Using the process type fouling factor of 0.002 hr ft2 °F/Btu equals a clean percentage of 40% (300/750 = 0.40). Converting the value to excess area equals 2.50 (1/0.4), or 150% excess area. For comparison, using a . 0003 fouling factor equals a clean percentage of 82% (612.2/750 = 0.82).

How is barometric pressure calculated?

To calculate barometric pressure, look at a barometer and write down the pressure reading. Then, check back in an hour and write down the new reading. Once you have both readings, subtract the current pressure from the pressure an hour ago to determine how much the barometric pressure has risen or fallen.

How can I improve my condenser performance?

Reducing cooling water temperatures is a sure-fire way to improve condenser performance: A decrease in cooling water temperature of 10 degrees F can improve the overall heat rate of a power plant by 1%.

How do you calculate the number of tubes in a condenser?

1) Guess/estimate heat transfer coefficients e.g 5000 W/(m2K) for both coolant and condensing steam, and calculate the overall heat transfer coeffcient, U=ca. 2500 W/(m2K) (ignore wall resistance. 3) Select a tube diameter and suitable tube length ==> number of tubes and Shell diameter can be determined.

How do you calculate relative barometric pressure?

The importance of the relative pressure (P0) is that it allows calculating the absolute pressure (P) at any elevation (h) using the barometric formula: P=P0*exp(-Mgh/RT), where M molar mass of air, g standard gravity, T temperature and R universal gas constant.

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