How is evaporator capacity calculated?
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.
Why evaporator of air conditioner has more fins per inch?
They are best used in the air-cooling space where the temperature is around 34°F. Having fins mean the surface area for heat transfer has been extended. This means that the finned coils can have more compact in design compared to the bare-tube type of similar capacity.
How do you calculate cooling coil size?
Coil capacity – A mix condition can now be found and the cooling coil sized. 1.626 × gm =(0.75 × 1.626 × 0.00738) + (0.25 × 1.626 ×0.01210). Cooling medium mass flow rate – Calculate the required mass flow rates of chilled water for water to air heating coil.
How do you calculate cooling capacity of a heat exchanger?
How Much Cooling Capacity Should I Purchase?
- DT= the °F difference between incoming and outgoing tap water temperature of your instrument.
- K = Specific heat multiplied by the density of the fluid being circulated.
- Use 2,326 for water when calculating load in °F.
How is chiller cooling capacity calculated?
Divide Q (BTUs per hour) by 12,000 (the number of BTUs in one ton of cooling capacity). This yields the chiller capacity required to handle the process heat load in tons per hour: Example: 240,000/12,000= 20 tons/hr.
How do you calculate 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.
What is fins per inch?
FPI stands for “Fins Per Inch” and it is the standardized measurement unit for the density of radiator fins. It literally represents the number of fins over a length of one inch.
What is coil capacity?
In a chilled water coil, the air temperature is higher than the water temperature; therefore, heat is removed from the air and given to the water. In a hot water heating coil or thermal liquid coil, the liquid is a higher temperature than the air; thus, the water or thermal liquid gives its BTU/hr capacity to the air.
How do I know the cooling capacity of my air conditioner?
Calculate Size 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.
How do you calculate radiator cooling capacity?
Using the energy equation of Q = ṁ x Cp x ΔT we can calculate the cooling capacity. We add 273.15K to the celcius to convert it to units of Kelvin. The Specific heat capacity (Cp) is measured in units of kJ per kg per Kelvin.
What is cooling capacity of cooling tower?
The Figure 7.2 illustrates various cooling tower types. Mechanical draft towers are avail- able in a large range of capacities. Normal capacities range from approximately 10 tons, 2.5 m3/hr flow to several thousand tons and m3/hr.
How many fins are in an air conditioner cooling coil?
Air conditioning coils range from about 8 to 14 fins per inch, while a cooling coil use from 1 to 3 fins per inch, because frost easily blocks the flow of air through the heat exchanger when the fins are located close to each other.
How does a finned tube evaporator increase its cooling capacity?
Once the coil capacity increased by adding fins to its tubes, so is its capacity increased by forcing air above it. Both methods permit a greater amount of heat to be absorbed in the leg evaporating pipes, achieving naked evaporator tubes. The end result is a more compact coil with the same cooling capacity.
What is the formula for cooling and heating?
Cooling/Heating: Total Capacity (BTU/hr) = 4.5 x CFM x (H ewb – H ₁wb) Sensible Capacity (Btu/hr) = 1.08 x CFM x (T 1 db – Tedb) Latent Capacity (Btu/hr) = 0.68 x CFM x (Grains H 2 O removed per lb. air)
How to calculate the fluid velocity of a water coil?
Water Coils: Fluid Velocity (feet per second) = (TC x GPM) / (Number of Feeds) *Cooling: Total Capacity (Btu/hr) = 500 x GPM x (T1w-Tew) *Heating: Total Capacity (Btu/hr) = 500 x GPM x (Tew-T1w)