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Leading Manufacturer, Supplier & Retailer of and Air Handling Unit.

Air Handling Unit

In this write up, an energy-saving device is introduced into the air-handling unit (AHU). Due to increases in energy costs, energy saving devices or systems have become the new preferred trend in tropical countries. A primary cooling coil system is incorporated into the AHU to recycle the condensate water in order to achieve energy savings. The warm outside fresh air is drawn through the primary cooling coil to recover the latent heat of condensate water. The large temperature gradient between the warm fresh air and condensate water enlarges the amount of energy recovered. This system is well applicable to primary AHU which serves primary air to the airconditioning system. The cost of installing the device is negligible but in returning long term saving. Furthermore, the de-cooled condensate water can be drained off through non-insulated drain pipe. The idea generation is discussed in the introduction. Chapters 2 and 3 describe the preliminary calculation of the energy saving percentage. Chapter 4 shows the detailed theoretical study of the development of the energy saving system. This shows the viability of the idea. Chapter 5 will recommend the design of the primary cooling coil configuration to achieve the desired cooling effect and energy saving strategy. Lastly, the conclusion of the whole study is presented. In tropical countries such as the United Arabia Emirates (UAE) and Malaysia, the climate is always hot and highly humid throughout the year. Lots of energy is consumed for Air-Conditioning and Mechanical Ventilation (ACMV) systems. For buildings such as hotels and hospitals, energy is used to cool down the fresh air in the primary AHU and pumped into the building to achieve the internal air quality required. Due to the high humid climate, lots of condensed water is drained away as a by-product. However, the cooled condensate water actually consumes 2% of the total cooling load of the system on average. Here, we are studying the recovery of the condensed water in which the 2% energy can be saved. 2% of energy for a system running 24 hours a day can make a significant reduction for the operating cost. The condensed water is first collected by the condensate drain pan below the main secondary cooling coil. Then, the collected condensed water is pumped into the primary cooling coil for the de-cooling process. In order to maximize the energy recovery, a primary cooling coil is recommended to be installed at the fresh air intake opening of the AHU where the temperature gradient between the air outside and condensate water is greater, rather than at the side in which air returns or at the mixing plenum.

  • Specifications
    Model CFM Fan Model Coil Area (Sq Mtr.) Height (mm) Weight (mm) Depth (mm)
    DDSH-018 1100 180 0.20 750 900 1150
    DDSH-028 1400 200 0.26 800 900 1200
    DDSH-029 1800 225 0.33 800 1000 1300
    DDSH-037 2200 250 0.41 900 1100 1400
    DDSH-046 2800 280 0.51 1000 1375 1450
    DDSH-059 3500 315 0.65 1000 1375 1450
    DDSH-068 4000 355 0.74 1100 1375 1600
    DDSH-074 4400 355 0.82 1100 1425 1600
    DDSH-085 5000 400 0.94 1200 1425 1700
    DDSH-093 5500 400 1.02 1200 1550 1700
    DDSH-102 6000 450 1.12 1300 1550 1800
    DDSH-115 6800 450 1.26 1300 1650 1800
    DDSH-130 7700 500 1.43 1400 1900 2000
    DDSH-144 8500 500 1.58 1400 1900 2000
    DDSH-161 9500 560 1.77 1500 1900 2200
    DDSH-183 10800 560 2.01 1500 2050 2200
    DDSH-204 12000 630 2.23 1600 2050 2300
    DDSH-229 13500 630 2.51 1600 2350 2300
    DDSH-255 15000 710 2.79 1750 2350 2550
    DDSH-289 17000 710 3.16 1750 2650 2550
    DDSH-340 20000 800 3.72 2000 2650 2700
    DDSH-365 21500 800 4.00 2000 2800 2700
    DDSH-425 25000 900 4.65 2250 2800 2900
    DDSH-459 27000 900 5.02 2250 3000 2900
    DDSH-570 30000 1000 5.58 2500 3000 3000
    DDSH-578 34000 1000 6.32 2500 3000 3000

     

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  • Mr. Yash Verma
  • C-34, Sector No. 63, Sector 63, Noida - 201307, Noida, Uttar Pradesh - 201307, India