https://www.rundellengineering.com/blog daily 0.75 2026-03-24 https://www.rundellengineering.com/blog/chilled-water-plant-optimization-ashrae-guideline-36 monthly 0.5 2026-03-24 https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/512a6c9c-d35b-4816-a770-3016610eaee4/shutterstock_1195406662.jpg Thoughts - The Evolution of Chilled Water Plant Optimization: From First Principles to Guideline 36 - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.rundellengineering.com/blog/funding-hvac-bas-and-central-utility-upgrades-with-utility-rebate-incentives monthly 0.5 2026-02-02 https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/8e053b5c-abe5-4c18-8050-d5ffe17188b0/plumbing-1103725_1920.jpg Thoughts - Funding HVAC, BAS, and Central Utility Upgrades with Utility Rebate Incentives - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/d836db29-c332-49f4-8568-41b96bdb5a61/NJ+Custom+2.png Thoughts - Funding HVAC, BAS, and Central Utility Upgrades with Utility Rebate Incentives - Make it stand out Illustrative custom program incentive rates and cost caps for PSE&G, JCP&L, and Atlantic City Electric, shown for early project screening and planning purposes. Refer to program pages for latest rates. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/82861b4a-83ab-4c49-b0a2-43fceeb69c5f/NJ+Energy+Management+RCx+4.png Thoughts - Funding HVAC, BAS, and Central Utility Upgrades with Utility Rebate Incentives - Make it stand out Illustrative Energy Management RCx incentive rates for New Jersey utilities, shown for planning and screening purposes. Refer to program pages for latest rates. https://www.rundellengineering.com/blog/supply-air-temp-reset monthly 0.5 2023-04-21 https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/9bba3f2f-0e69-4942-a65d-8a5b5e29dac1/ventilator-349658_1920.jpg Thoughts - The Ele(fan)t in the Room (Part 2): Supply Air Temperature Reset - Make it stand out Fan energy is the highest electric consuming component in commercial HVAC. The supply air temperature setpoint is one of the single biggest factors in determining fan energy and HVAC performance. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/d9afe096-3763-4df2-9432-91d9857e395e/01+Cooling+and+Dehumidifying+2.png Thoughts - The Ele(fan)t in the Room (Part 2): Supply Air Temperature Reset - Make it stand out When the outside air is wet (summer), removal of moisture via the cooling coil is required. In this example, cooling the air to 55°F achieves the right balance of sensible and latent cooling, falling on the Sensible Heat Ratio (SHR) line. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/caa6f194-96f1-4325-887d-ada72e3f6810/02+Under+Cooling+2.png Thoughts - The Ele(fan)t in the Room (Part 2): Supply Air Temperature Reset - Make it stand out When the outside air is wet (summer), removal of moisture via the cooling coil is required. In this example, cooling the air to 61°F does not remove enough moisture from the air stream, and injects moisture into the space which will result in a humid, clammy space. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/39d414da-e8cb-4f05-abb2-d96a0282c1a9/03+Sensible+Cooling+Only+2.png Thoughts - The Ele(fan)t in the Room (Part 2): Supply Air Temperature Reset - Make it stand out When the outside air is dry (winter), the cooling is sensible-only and therefore the supply air temperature setpoint can be increased without concern of moisture control. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/8b06b055-63a6-4697-9606-cfe311c50b28/ASHRAE+G36+-+SAT+Reset.png Thoughts - The Ele(fan)t in the Room (Part 2): Supply Air Temperature Reset - Make it stand out ASHRAE Guideline 36 (G36), section 5.16.2 Supply Air Temperature Control, describes the rest of supply air temperature based on outside air conditions with a trim-and-respond approach based on terminal box cooling requests. https://www.rundellengineering.com/blog/elefant-in-room-optimization-hvac-vacancy monthly 0.5 2023-04-19 https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/0dde760a-18d8-43fe-9d82-53952fba6f88/1605778981-huge.jpg Thoughts - The Ele(fan)t in the Room (Part 1): Optimization of HVAC for Vacancy - Make it stand out Fan energy is the highest single electric energy-consuming component in commercial buildings according to US EIA data. Fan energy is rarely optimized for part load and/or vacant space conditions. Use of Occupied Standby mode and optimization of Min Primary Airflow setpoints is essential to maximizing savings of HVAC systems in these conditions. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/22f97ef3-cc65-4d36-8bea-ae383b9ae7a7/Flow+Fraction+-+RP-1515.png Thoughts - The Ele(fan)t in the Room (Part 1): Optimization of HVAC for Vacancy - Make it stand out ASHRAE RP-1515 analyzed the frequency that typical VAV boxes operate at their minimum primary airflow and found that VAV boxes often spend the majority of their time at minimum position. https://images.squarespace-cdn.com/content/v1/63a4cd39a637cd7b7249e386/b3b64195-6eb5-4cb4-bbd1-0486dd9ae4c8/shutterstock_1675204894-min.jpg Thoughts - The Ele(fan)t in the Room (Part 1): Optimization of HVAC for Vacancy - Make it stand out Occupied Standby Mode is an important tool, along with optimization of Minimum Primary Airflow Setpoints for maximizing performance of HVAC for lightly occupied and intermittently vacant spaces. 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