Topic hub · Year-round
Energy and efficiency
Envelope, insulation, economizers, commissioning, and the efficiency work that cuts operating cost.
Calculators for this work
Electrical
Energy audit and management field guide
Start with the bills and the EUI benchmark, not the walk-through, match the ASHRAE audit level to the decision, rank the fixes by payback, and prove the savings with measurement and verification.
Electrical
PV rapid shutdown (NEC 690.12)
De-energize the roof array on one action: the inside and outside boundary limits, MLPE, the listed PVRSS, the firefighter-accessible switch, and the commissioning test that proves it drops.
Electrical
Battery energy storage (BESS)
The battery that cuts the demand charge is also the biggest fire-code problem on the job. Get the chemistry, the interconnection, and the thermal-runaway rules right, because the fire code governs this install as much as the electrical code.
Electrical
Dry vs liquid transformer guide
Pick the transformer type from location, kVA, voltage, fire, and efficiency: dry-type or liquid-filled, ventilated or cast resin, mineral oil or less-flammable ester.
Electrical
Transformer acceptance testing field guide
Prove the transformer before you energize it: the turns ratio, the insulation, the winding resistance, the polarity, and the tap, then record the baseline the maintenance crew will trend against.
Electrical
Lockout/tagout field guide
Isolate every source, lock and tag each one, release the stored energy, and prove the circuit dead before a hand goes near it.
Concrete
Struck-by and caught-in hazards
Two of OSHA's Focus Four kill the most workers after falls. Keep people out of the line of fire and out of the pinch: spotters, guards, lockout, and distance from the energy.
Concrete
Curtain wall and glazing
What a curtain wall is and why a good one drains water instead of sealing it out, the systems, the glass, the thermal break, the air and water barrier tie-in, anchorage and movement, and the performance mock-up.
Concrete
Mass concrete thermal control
What makes a placement mass concrete, the two temperature limits that govern it, and how the crew holds them with the mix, precooling, insulation, and monitoring.
HVAC
Retro-commissioning existing buildings
What retro-commissioning is, why tuning the building you already have beats replacing it, how to find the drift with trend data and functional tests, and how to keep the savings from drifting back.
HVAC
FDD and building analytics field guide
What fault detection and diagnostics is, the trend-data and tagging layer underneath it, the faults it finds, how it prioritizes and diagnoses, and the detect-diagnose-dispatch-verify loop that closes the fix.
HVAC
Economizer fault detection field guide
Find the broken economizer that runs mechanical cooling unseen: stuck dampers, dead actuators, bad sensors, the wrong changeover, the FDD logic, and the functional test that proves it.
HVAC
Waterside economizer free cooling
How the cooling tower makes chilled water with the chiller off when the wet-bulb drops, the plate heat exchanger that keeps the loop clean, integrated control, and the freeze protection that keeps it from killing the plant in winter.
HVAC
VAV vs CAV air distribution
What separates constant air volume from variable air volume, how each one controls a zone, where the energy goes, and which system belongs on the building in front of you.
HVAC
HVAC preventive maintenance guide
How to run a real PM program: the schedule, the filter and coil work, the economizer nobody checks, the charge you do not top off, and the record that proves it.
Plumbing
Hot water recirculation loops
Why the loop exists, how to pick the loop type, size the pump and the return, balance every riser, hold the return temperature, and control the energy without parking the loop in the Legionella band.
Plumbing
Fixtures and water efficiency
What the water-using fixtures are, how tank and flushometer flushing split residential from commercial, and the gpf and gpm limits that decide which fixture you are allowed to install.
Plumbing
Pipe insulation field guide
Hit the energy-code thickness on hot pipe, keep cold pipe above the dew point behind a continuous vapor barrier, and stop the thermal short at every hanger so the line does not sweat, rot, or freeze.
Plumbing
Pipe freeze protection field guide
Replace the pipe's heat loss with self-regulating cable, keep it under continuous insulation, protect it with a 30 mA equipment ground-fault breaker, and megger it before anyone energizes it.
Datacenter
Digital twin for operations
What an operations digital twin actually is, why it has to be connected to live data and used for a decision, and how it is born from the commissioning handover, not a static 3D model nobody updates.
Datacenter
Data center airflow management
Getting cold air to the inlets and hot air back without mixing: hot-aisle/cold-aisle discipline, bypass and recirculation, blanking panels, containment, tile tuning, and the airflow commissioning that buys back stranded capacity.
Datacenter
Rack BBU and ride-through
Why hyperscalers put lithium battery backup units in the rack to carry the load through a power blip and bridge the seconds to the generator, what the OCP Open Rack BBU shelf is, and the fire-safety questions that come with lithium in the white space.
Datacenter
Data center waste heat reuse
Turning the heat a data center throws away into a product: low-grade heat, why liquid cooling makes it usable, the heat pump that upgrades the temperature, the offtaker, district heating, and the ERF that scores it.
Datacenter
Data center TCO cost model
What a data center costs over its life, why power and cooling dominate the number instead of the building, and how to model it per megawatt so the comparison between build, colocation, and cloud holds up.
Datacenter
Data center sustainability reporting
The full scorecard, not one number: PUE, WUE, CUE, and ERF against a defined boundary, carbon reported across scopes 1 to 3 in both market-based and location-based terms, and an honest read of the renewable-matching debate.
Roofing
Roof ponding water
What ponding water is, the NRCA 48-hour rule, why it kills the membrane and the warranty, slope versus deflection, and the tapered-insulation and drainage fixes that actually work.
Roofing
Building insulation and air sealing
Why air sealing matters as much as the R-value, the insulation types and where each fits, the continuous air barrier, climate-correct vapor control, thermal bridging, and ventilating a tight building.
Roofing
Roof attic ventilation
How a balanced attic works: intake low at the soffit, exhaust high at the ridge, the 1:150 and 1:300 net free area rule, why you never mix exhaust types, and how ventilation, air sealing, and insulation keep the deck cold.
Roofing
Cool roof reflectivity and energy
What a cool roof is, how solar reflectance and thermal emittance combine into SRI, the aged-value catch, the cold-climate tradeoff, and the code numbers you have to hit.
Roofing
Single-ply attachment and wind
How a single-ply membrane and its insulation get held to the deck against wind uplift: mechanically attached, fully adhered, induction-welded, and ballasted, matched to the FM and ASCE 7 wind design.
Roofing
Roof vapor retarder and air barrier
What the vapor retarder and the air barrier each do in a low-slope roof, why air leakage wets insulation faster than diffusion, which side the retarder goes on, and when the assembly actually needs one.