How to Make a Portable Shop Air Cleaner for $200: youtube.com/watch?v=fixd7LqnWow

Simple Cyclone Dust Collector: youtube.com/watch?v=1WnitgYFnE0

HP announces autonomous floorplan-printing robots: youtu.be/2jMJ9hGjQPE

Ventilation – DIY

Fans

Axial flow fans come in a number of forms:

  • Propeller fans: Usually have inexpensive construction and are limited to low pressure applications.
  • Tube axial fans: More efficient than propeller fans, and capable of developing more useful static pressure. They can range in the number of blades, blades shapes, and the hub usually covers less than 50% of the fan tip diameter.
  • Vane axial fans: Improved design permits medium to high pressure capability and good efficiency. Most blades of this type are aerofoil in shape and can be fixed, adjustable or controllable pitch types. The hub is usually greater than 50% of the tip diameter.

Inline Mixed Flow Industrial Fan 150Ø EC thehvacshop.co.nz/products/view/1104 $275

  • Blade Fire Proofing Grace UL94V-0
  • Detachable 0%-100% speed control (potentiometer) included
  • 6-Pole Brushless Motor with Sine Wave
  • Double heavy duty NMB ball bearing, low temperature, life expectancy up to 85000 hours.
  • Locked motor protection [Auto-restart] : soft-start
  • 3-year warranty
  • IPX4 protection class, waterproof and dustproof
  • Customized Feature: PWM/ Control by 0-10v / Voltage output / Tacho output
  • Max. IP68 water-proof level available
  • Duct connection both ends
  • Model SE-A150Z
  • Fan Size 6 inch / 150mm
  • Rated Voltage 110V-240V AC
  • Max. Power C. 40 W
  • Frequency 50 Hz / 60 Hz
  • Max. Speed 5000 RPM
  • Max. Airflow 350CFM / 594M³H
  • Static Pressure 51mm H²O / 500Pa
  • Noise Level 60.0dBA
  • Housing Material – Cold Rolled Steel
  • Motor Type EC brushless Motor

Sizing a System

The average adult needs 420 to 480 liters per hour when resting. (0.48 m3/h or 7-8l/s)

The Building Code requirement for fresh outdoor air ventilation requires ventilation for occupied spaces in accordance with NZS 4303:1990 Ventilation for acceptable indoor air quality.

Occupant loading = 2 (Master BR) +1 (BR 1) +1 (BR 2) = 4 people.

Rangehood of >100cfm

For example:

  • for a house with a floor area of 400 m2 and internal volume of 1600 m3 – 32l/s = 1.9 m3/h = 1.11cfm
  • for a house with a floor area of 250 m2 and internal volume of 900 m3 – 18l/s = 1.0 m3/h = 0.62cfm

The results of the measurements and dynamic simulation showed that the heat recovery ventilation system could lead to 74 per cent energy savings of the ventilation loss, amounting to about 30 kWh m-2 per year. Life cycle cost analysis used for assessing total costs and the result showed that using this system is quite cost‐effective and investment would payback during 12 years. Impacts of heat recovery ventilators on energy savings and indoor radon level. Keramatollah Akbari, Robert Oman ISSN: 1477-7835 Article publication date: 2 August 2013

Savings of $1200-1500 per year using heat recovery in theory, probably half.

Filters

nzduct.co.nz/shop/products/filter-media

VBANK for high performance and safety: Hospitals, office buildings

POCKET for commercial buildings, schools, automotive plants, shopping centres, hotels, food processing plants and can be used as a PRE FILTER in car spray booths, electrical equipment or Superfine/Absolute (HEPA) filtration systems

Micro channel heat exchanger (MCHE) is ideal for use in residential and commercial air conditioning systems as well as in refrigeration equipment driven by energy efficiency.

danfoss.com/en/products/dcs/heat-exchangers/micro-channel-heat-exchangers/#tab-overview

Counter flow works better (Inlets at opposite ends)

Blower Door Testing

How to run a blower door test youtube.com/watch?v=wCEZhj75W0k

How to build a blower door youtube.com/watch?v=SKEEeLNWd60