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About Harry Zhang


I am someone who loves reading technical books and research papers and similarly enjoys applying scientific theories (Fluid mechanics, Thermodynamics, Chemistry and Physical Chemistry) to solve engineering problems. In my leisure time, I love running, and I’ve run marathons.

With 15+ years of experience in sizing and designing air pollution control (APC) equipment and working on industrial ventilation (HVAC) systems, I am able to do field work, sales support, APC equipment selection and sizing, engineering design of a new system, and engineering calculations, based on the knowledge and hands-on experience gained through projects I finished before. You can read my blogs here to know more about my background.

Skills:

  • AutoCAD and Microsoft Office (Excel, Word, PowerPoint, Access)
  • Computer Language: Fortran and C
  • Thermal calculations (mass and energy balancespsychrometric chartcooling and heating, and moisture control)
  • Air Pollution Control (APC) equipment (Dust collection and gas contaminants removal) selection and sizing:
    • Wet scrubbers
    • High-efficiency cyclone, standard cyclone, oversized cyclone,
    • baghouse, cartridge dust collector, ceramic cartridge filter, 
    • horizontal classifier, and drop-out box
  • Engineering design (Duct sizing and Pressure loss calculation) of Industrial Ventilation /Dust collection systems
  • Packed Tower and wet scrubbing system: pumps, expansion joints, fittings, flow meters, valves (manual and auto), spray nozzles, mist eliminator, instrumentations (pH, Conductivity, and ORP sensors and transmitters, level switch, leak detect sensor, gas sensors, etc.)
  • Piping and pump system pipe sizing and pressure loss, required pump total head and available NPSH calculations, spray nozzle required pressure calculations and control valve sizing and openness calculations for wet scrubber/packed tower/Venturi scrubber systems.
  • Piping specifications
  • Physical property calculations and estimations for gas mixture and liquid solutions: viscosity, density, vapor pressure, etc.
  • Material selection for corrosion resistance (Metal, Plastics, or FRP)
  • Air volume calculation and Determination for process ventilation
  • Thermal insulation calculations for ductwork
  • Pressure vessel calculations
  • Venting of deflagration calculations for baghouse and cyclone per NFPA 68
  • Project Turnover Package (Vendor Data Book) (IOM, QC, Equipment Data Sheets)
  • Line List, Utility List, Equipment List, Lubrication ListInstrument List, and Bolt & Nuts List
  • Bill of Material (BOM): fittings, Valves, bolts and nuts, instruments, and pumps for recirculation pump and metering pump skids
  • P&IDs, General Arrangement, & whole system Functional Specifications (Operational Specifications) & Equipment Specifications

I not only can do calculations and designs in the office, but can work as a field engineer and perform field work and field surveys too. On site, I can measure, calculate and adjust the system operation and give recommendations on system improvements based on the data from measurements and calculations.

Skills:

  • Trouble-Shooting
  • Whole system Air Balancing
  • FAT (Factory Acceptance Testing)
  • Mechanical Completion walk-through: confirmation of fabrication, assembly and nonfunctional testing of a specific system(s) or facility on site to confirm the integrity of the construction and installation.
  • SAT (Site Acceptance Testing) and Deviation List
  • Mechanical Completion Punch List: a list of items from all disciplines, discovered during SAT that must be completed prior to Commissioning 
  • New system Start-up step by step and Commissioning, including system balancing, baghouse controller optimization, and fan belt tension adjustment, setpoint optimization, etc.
  • PID loop parameters adjustment
  • Comprehensive report including: complete system airflow analysis, duct & hood design review, actual & baseline performance, etc.

Popular posts from this blog

Industrial Manuals, Standards and Codes I’ve Consulted

  When doing calculations, designing, and/or on-site work, we have to figure out which standard and code (federal, state, local) we will follow.   EPA and Permits EPA Title V Operating Permits (EPA) National Emission Standards for Hazardous Air Pollutants (NESHAP), Rule 6X for metalworking operations (EPA) Method 22: visual determination of fugitive emissions from material sources (EPA) Method 9: Visual determination of the opacity of emissions from stationary sources NAAQS (National Ambient Air Quality Standards)  On-site Measurement OSHA Technical Manual (OTM) Section II: Chapter 3, on-site Measurement (EPA) Method 22: visual determination of fugitive emissions from material sources (EPA) Method 9: Visual determination of the opacity of emissions from stationary sources Airborne Contaminants Cal/OSHA Title 8 Section 5155 - Airborne Contaminants OSHA (CFR, Title 29,1910) and Subpart Z - Toxic and Hazardous Substances OSHA 3348-05: Guidance for the Identification and...

What you have to know when applying blast gate damper

  Introduction A damper is a device that adjusts the volume of airflow passing through the outlet, inlet or duct. By proper adjustment of all dampers in a system, a desired distribution of airflows in all the branches can be obtained, while minimizing the total airflow of the system to save energy— this is also termed air balancing. The most common dampers used in industrial ventilation and dust collection systems to balance airflows are slide gate dampers (The slide gate, also called “blast gate or cut-off” damper). In a slide gate damper (see Figure 1 of a straight flat slide gate damper), the slide is inserted perpendicular to the flow. Figure 1 A sample of straight flat slide gate damper As the gate is sliding into the duct, it will add resistance to the airflow and consequently reduce the volume of airflow, while increasing airflows in all other branches. Withdrawing the gate has the reverse effect on that branch and all the others in a system. Interaction between a fan ...

Why and How to do Air Balancing on Industrial Ventilation and Dust Collection Systems?

  Introduction The performances of all the hoods in the whole system normally decide the success of industrial ventilation and dust collection systems from the point of a system owner’s view. The appropriate hood design and its needed airflow rate require the application of good ventilation practice, mastery of the technical knowledge and the ability and patience to do the mathematical calculations. When more than one hood is connected to one ventilation system, the design engineer has to assure that each hood can and will receive the volume of airflow equal or above its designed value and the whole system operates with the minimum possible airflow rate to save energy. This task is termed air balancing of the system or duct balancing. Unbalanced systems cause problems On the contrary, examine the case where one or more hoods are unable to receive desired volume of airflow from an unbalanced ventilation system. It is not uncommon that many hoods are receiving airflow volumes...