Air-cooled condensers, often referred to as “remote condensers”, became more commonly used back in the 1960’s and 1970’s as the use of water-cooled systems which dumped city water down the drain became cost prohibitive or banned.
Another factor which I think boosted their popularity was the advent of the Alco Headmaster head pressure control valve, which allowed relatively trouble-free winter operation with air-cooled condensers. >>>To read this the rest of this article, you must be registered and logged in. Please return to the Home page to log in.<<< Prior the the headmaster, condensers used various methods of controls, including head-pressure actuated dampers which were prone to icing up or jamming up.
Condenser Design Calculation Pdf Converter. We have an Emtek water evaporator we are trying to convert. Between technicians and add activity CALCULATING OCCUPANT LOAD CONTINUED This. Go kart chassis engineering, heatcraft engineering manual, active skills 3rd edition. 3/60/460 Volt, design pressure high side 450 psig, low side 178 psig. Locate the column for R-404A refrigerant and read down until you locate a value equal to or just larger than 4.01. This closest value larger than 4.01 is 4.77. Read horizontally to the left to get the condenser model, DVT010. Step 5: Calculate Actual TD and Condensing Temperature. The actual condenser TD can be calculated by dividing the design. Addition to the pump on the low level design (refer to Figure II). 1.3 Mechanical Description (Refer to Figure III) Barometric condensers are constructed of cast iron, carbon steel, fiberglass reinforced plastic, Haveg, graphite and all weldable alloys. There are two (2) basic parts of a condenser: (1) the shell body, and (2) the spray device(s).
The condenser is also a heat exchanger. In this case the heat absorbed from the building, plus the work from the compressor, transfers from the refrigerant (condensing the refrigerant) to the condenser water (raising the water temperature). The condenser has the same limitations to flow change as the evaporator.
GBH Enterprises, Ltd. Process Engineering Guide: GBHE-PEG-HEA-508 Selection and Design of Condensers Information contained in this publication or as otherwise supplied to Users is believed to be accurate and correct at time of going to press, and is given in good faith, but it is for the User to satisfy itself of the suitability of the information for its own particular purpose.
The capacity of an air-cooled condenser are based on Total Heat of Rejection (THR) of the refrigeration system. The THR is equal to compressor cooling capacity plus the heat equivalent of the power input to the compressor motor, usually found in the compressor ‘s performance data sheets published by the manufacturer, and expressed as Watts (W) or kilowatts (kw). This heat energy is sometimes called the heat of compression.
The heat of compression will vary depending on the compressor manufacturer, type of compressor and the operating conditions of the compressor. Whenever possible, it should calculated by multiplying the Watts x 3.413 Btuh/watt to covert it to Btu/hr. If the performance data values aren’t available, the THR can be estimated using the following formula:
THR = (Compressor Capacity) x (Heat of Compression Factor, Table 1)
Table 1 contains heat of compression factors for hermetic and semihermetic compressors.
For refrigeration systems beyond the range of Tables 1, use the following equations to estimate THR = Compressor Capacity (BTUH) + (3413 x KW)
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The compressor capacity is effected by its altitude. If the condenser location is above sea level, an additional correction is required to the THR, as follows: THR (altitude) = THR * Altitude Correction Factor, Table 3
Selection Example:
Compressor capacity: 45,000 Evaporator temperature: +25° F Condensing temperature: 110° F Ambient temperature 95° F Refrigerant: R-404A Condenser altitude: 1,000 feet
Step 1: Estimate Condenser THR
From Table 1 for suction cooled compressors, at +25° F suction and 110°F condensing, find the heat of compression factor as 1.31.
THR = Compressor Capacity x Heat of Compression Factor THR = 45,000 x 1.31 = 58,950 Btuh
Step 2: Correct for Altitude
From Table 3 obtain an altitude correction factor of 1.02 for 1,000 feet. This will give us a corrected value of the “Actual THR” which we’ll call the “Selection THR”
Locate the column for R-404A refrigerant and read down until you locate a value equal to or just larger than 4.01. This closest value larger than 4.01 is 4.77. Read horizontally to the left to get the condenser model, DVT010.
Step 5: Calculate Actual TD and Condensing Temperature
The actual condenser TD can be calculated by dividing the design THR by the condenser rating:
Actual TD = Selection THR(MBH) / (Rating @ 1°F TD) Actual TD = 60.13 / 4.77 = 12.6°F. T.D.
The actual condensing temperature is the actual TD plus the ambient temperature:
Actual Condensing Temperature = (Actual T.D.) + (Ambient) = 18.4 + 95 = 113.4°F.