This cold chain heat recovery case study looks at a refrigerated distribution center that captures condenser reject heat to warm the dispatch area and preheat sanitation water, instead of dumping it outdoors. The Opportunity Every kW of cooling at the evaporator becomes roughly 1.2 to 1.4 kW of heat at the condenser. In cold chain […]
EU EPBD and Zero-Emission Buildings
The revised Energy Performance of Buildings Directive (EU) 2024/1275 — the EPBD — entered into force on 28 May 2024, with Member States required to transpose it into national law by 29 May 2026. It raises the bar from nearly-zero-energy to zero-emission buildings and makes heat recovery central to compliance. Key Dates Milestone Date Directive […]
District Energy Case Study
This district energy case study summarizes a representative low-carbon heating and cooling network that supplies a mixed urban district from recovered industrial waste heat plus combined heat and power (CHP). System Layout A district energy station consolidates heat from a nearby factory’s exhaust and a natural-gas CHP module. A seasonal storage buffer shifts summer cooling […]
EU Ecodesign Requirements for Ventilation Units
The European Union regulates ventilation units through Regulation (EU) 1253/2014 (the “Ecodesign” Lot 21 measure). It sets binding minimum thermal efficiency and fan-power limits for units placed on the EU market, so any AHU or ERV sold in Europe must comply. Scope Applies to residential and non-residential ventilation units with a fan electric power of […]
Heat Pump Selection Calculation
A correct heat pump selection calculation prevents both undersizing (poor performance) and oversizing (short cycling and wasted capital). The method below applies to space heating, domestic hot water, and process heat recovery alike. Step 1 — Define the Load Start from the peak heating or cooling load in kW. For recovery duties, size to the […]
ASHRAE 62.1 Ventilation and Energy Recovery
ASHRAE 62.1-2022 sets the minimum ventilation rates for acceptable indoor air quality, and its requirements directly drive how much outdoor air — and therefore how much recoverable energy — a system must handle. Energy recovery is the bridge between good ventilation and reasonable energy bills. The Ventilation Rate Procedure Section 6.2 uses the Ventilation Rate […]
Desiccant Dehumidification Heat Recovery
Desiccant dehumidification heat recovery combines moisture removal with energy recycling. A desiccant material (solid wheel or liquid solution) absorbs water vapor from process air; the now-concentrated desiccant is regenerated using low-grade heat, and that regeneration stream’s energy is recovered rather than wasted. Why Pair Desiccation with Recovery Conventional cooling-only dehumidification overcools then reheats the air, […]
ASHRAE 90.1 Heat Recovery Requirements
ASHRAE Standard 90.1 is the reference energy standard for commercial buildings in the United States, and its exhaust-air energy recovery rule is the single most common code trigger for specifying a heat recovery ventilator. This article summarizes the ASHRAE 90.1-2022 requirements that apply to designers specifying air-to-air recovery. When Recovery Is Mandatory (Section 6.5.6.1) A […]
Membrane Energy Recovery Ventilation
Membrane energy recovery ventilation (MERV) uses a stationary, non-rotating polymer membrane core to transfer both sensible and latent heat between supply and exhaust airstreams. Unlike a rotating energy recovery wheel, a membrane exchanger has no moving parts and physically separates the two airstreams, which eliminates the carryover of moisture, odors, and particulates that can occur […]
Commercial Building Heat Recovery: Offices, Hotels, Mixed-Use
The everyday opportunity Offices, hotels, and mixed-use buildings run ventilation around the clock with high fresh-air rates. Recovering that exhaust energy is the single biggest HVAC saving for most commercial stock. Technology mix Offices – balanced AHUs favor plate or rotary recovery; see AHU recovery. Hotels – guest-room ventilation plus laundry and pool loads; pair […]