Energy efficiency tip of the day (HVAC high level energy assessment)

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Energy efficiency tip of the day (HVAC high level energy assessment)

Background:

Evaluating your HVAC system is the first step to identify the credible energy saving opportunities that could be converted into actions (modifications) after proper feasibility evaluation. In this article we will present the high level assessment questions that can reveal those opportunities as a start.

How to evaluate your HVAC system

  1. Is equipment running in vacant areas?

❏ Yes

  • Shut down unneeded equipment.
  • Install timer controls to turn equipment off after business hours.

❏ No

  • Recheck periodically.
  1. Are temperatures appropriate (21°C in winter / 24°C in summer)?

❏ Yes

  • Calibrate thermostats at the beginning of the spring and fall.

❏ No

  • Set the thermostats at the lowest acceptable setting in winter and the highest acceptable setting in summer.

 

  1. Can thermostats be turned down at night?

❏ Yes

  • Check that temperatures are lower at night than in daytime (winter 2–3°C lower / summer 2–3°C higher).

❏ No

  • Install set-back thermostats in areas that are unoccupied overnight and on weekends.

 

  1. Are fan and pump belts properly aligned?

❏ Yes

  • Recheck monthly.

❏ No

  • Adjust belt tension and align couplings.

 

  1. Are vents closed? Do dampers close tightly?

❏ Yes

  • Recheck at least once a season.

❏ No

  • Repair or replace links and dampers.

 

  1. Is the building under negative pressure?

❏ Yes

  • Check for an imbalance between exhaust and make-up air (consider installing a make-up air system to correct the imbalance).

❏ No

  • Check for stratification.

 

  1. Is too much cold or hot air getting in?

❏ Yes

  • Find the leaks and close them.
  • Consider installing low-leak dampers or air curtains.

❏ No

  • Recheck at least annually.
  1. Is the intake of outdoor air more than what the American Society of Heating, Refrigerating and Air- Conditioning Engineers recommends (or any other applicable Code/standard ) or more than required for the process of dilution of contaminants?

❏ Yes

  • Consider steps to reduce the intake of outdoor air.

❏ No

  • No action required.

 

  1. Are insulation and solar shading adequate? Are all windows needed?

❏ Yes

  • No action required.

❏ No

  • Consider upgrading insulation, improving shading of windows and blocking unneeded windows.

 

  1. Are surfaces hot? Does any equipment generate enough heat to feel it?

❏ Yes

  • Add insulation.
  • Consider isolating heat-generating equipment and exhausting air.

❏ No

  • No action required.

 

  1. Is there high-volume exhaust at room temperature or higher?

❏ Yes

  • Consider a heat recovery system to preheat and pre-cool make-up air.

❏ No

  • No action required.

 

  1. Does the air-conditioning consume a lot of energy?

❏ Yes

  • Consider obtaining advice on using a space cooling and heating.

❏ No

  • No action required.

 

  1. For cold weather areas Is electric space heating widely used? Are large quantities of energy used to heat intake air?

❏ Yes

  • Consider natural gas heating.
  • Consider all of the following to warm intake air (if applicable) : – ground-source heat pump – solar heating – waste heat recovery – off-peak thermal storage

❏ No

  • No actions required, but recheck when fuel or equipment costs change.
Energy efficiency tip of the day (HVAC high level energy assessment)

Heating Ventilation and Air Conditioning at Building Roof

Magdy Aly

Energy manager, Energy efficiency consultant Passionate to help others to save Energy and Environment.

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