Calculating chiller and cooling tower refrigeration - in tons
- Condenser Cooling Capacity Calculation
- Air Cooled Condenser Capacity Calculation
- Condenser Capacity Calculation Formula
- Refrigeration Condenser Capacity Calculation
Many times we get the questions, 'how do you size the condenser with your evaporator?' Here are some helpful guidelines when sizing. Select condensing unit with a lower capacity than the evaporator ( 90% to 100% of evaporator ) design point - 38° sst (use 40°f for sizing purposes) if running room at 55° goldilocks type of conditions. Calculation; we can ignore this in our calculations since we consider the overall air-side resistance to be constant for all of our calculations). The resistance of the heat exchanger tube is a function of the thickness of the tube s, the conductivity of the tube k, and the mean cross 2.
Cooling towers tons pairs the water-cooled chiller tons and the water-cooled condenser tons.
Chiller Refrigeration Tons
Topaz studio 2 mac download. The process of cooling is called refrigeration. For commercial and industrial refrigeration systems most of the world uses the kilowatt (kW) as the basic unit of refrigeration. Some commercial and industrial refrigeration systems are rated in Tons of Refrigeration (TR, tons).
A water-chiller refrigeration ton is defined as:
Condenser Cooling Capacity Calculation
1 Refrigeration Ton (RT) = 1 TONScond = 12000 Btu/h = 200 Btu/min = 3025.9 k Calories/h = 12661 kJ/h = 3.517 kW
1 kW = 0.2843 Refrigeration Ton (RT)
A ton is the amount of heat removed by an air conditioning system that would melt 1 ton(2000 lbs.) of ice in 24 hours. The heat required to melt 1 lb of ice at 32 oF to water is 144 Btu.
1 Ton Refrigeration = (2000 lb) (144 Btu/lb) / (24 hr)
= 12000 Btu/hr
Converting between Btu/h and Tons of Refrigeration
| Btu/h | Refrigeration Ton | kW |
|---|---|---|
| 6000 | 1/2 | 1.76 |
| 12000 | 1 | 3.52 |
| 18000 | 1 1/2 | 5.28 |
| 24000 | 2 | 7.03 |
| 30000 | 2 1/2 | 8.79 |
| 36000 | 3 | 10.6 |
| 42000 | 3 1/2 | 12.3 |
| 48000 | 4 | 14.1 |
| 54000 | 4 1/2 | 15.8 |
| 60000 | 5 | 17.6 |
Cooling Tower Tons
A cooling tower ton is defined as:
1 cooling tower ton = 1 TONSevap = 1 TONScond x 1.25 = 15000 Btu/h = 3782 k Calories/h = 15826 kJ/h = 4.396 kW
The equivalent ton on the cooling tower side actually rejects about 15000 Btu/h due to the heat-equivalent of the energy needed to drive the chiller's compressor. This equivalent ton is defined as the heat rejection in cooling 3 U.S. gallons/minute (1500 pound/hour) of water 10°F, which amounts to 15000 Btu/hour, or a chiller coefficient-of-performance (COP) of 4.0 - a COP equivalent to an energy efficiency ratio (EER) of 13.65.
Heat Load and Water Flow
A water systems heat load in Btu/h can be simplified to:
h = cp ρ q dt
= (1 Btu/lbmoF) (8.33 lbm/US gal) q (60 min/h) dt
= 500 q dt (1)
where
h = heat load (Btu/h)
cp = specific heat, 1 (Btu/lbmoF) for water
ρ = 8.33 (lbm/US gal) for water
q = water volume flow rate (US gal/min)
Serious sam pc. dt = temperature difference (oF)
Example - Water Chiller Cooling
Water flows with 1 gal/min and 10oF temperature difference. The ton of cooling load can be calculated as:
h = 500 (1 US gal/min) (10 oF)
= 5000 Btu/h
= (5000 Btu/h) / (12000 Btu/ton)
= 0.42 ton
Related Topics
Air Cooled Condenser Capacity Calculation
- Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort
Related Documents
- Air Conditioner Efficiency - Air conditioner efficiency is the ratio between heat removed and power (watt) used - EER and SEER
- Chilled Water Systems - Chilled water system equations - evaporator and condenser flow rates
- Cooling Load - Convert kW/ton to COP or EER - Convert cooling load units kW/ton, COP and EER
- Cooling Tower Efficiency - Maximum cooling tower efficiency is limited by the wet-bulb temperature of the cooling air
- Cooling Water Pipe Lines - Sizing cooling water pipe lines - maximum allowable flow, velocity and pressure drops
- Heat Loss from Electrical Equipment - Heat loss from electrical equipment like switch gear, transformers and variable frequency drives
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- Refrigeration Formulas - Compression work, coefficient of performance and more
- Refrigeration Machinery and required Ventilation - Ventilation required for refrigeration machinery and compressors in hot areas
- Tons Cooling vs. Airflow and Duct Sizes - Typical relations between tons cooling, air flow and duct size
- Water Evaporator and Condenser Equations - Air conditioner heat loads, and evaporator and condenser water flow rates
Condenser Capacity Calculation Formula
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