California Title 24, Part 6 (the Building Energy Efficiency Standards) is the most aggressive state energy code in the U.S., and its 2022 edition — effective 1 January 2023, with a July 2024 Supplement — puts heat recovery at the center of both nonresidential and multifamily compliance. This article distills the recovery provisions that trigger […]
地热与地源空气预热
The earth a few meters below the surface stays near constant temperature all year. That stable thermal mass can be used to pre-condition ventilation air before it reaches a building, cutting heating and cooling loads. How Ground Coupling Works Outdoor air is passed through a buried pipe loop (ground heat exchanger) or across a ground-coupled […]
制药与洁净室排气热回收
Pharmaceutical plants and cleanrooms move huge volumes of HEPA-filtered air. Codes generally forbid recirculating exhaust that may carry contaminants, but the energy in that air can still be recovered using physically separated exchangers. Why Separation Is Mandatory GMP and HVAC codes require exhaust from containment areas to be discharged, not reused. Cross-contamination could compromise product […]
商业厨房热回收
Commercial kitchens run powerful hoods that throw away large amounts of hot, greasy air. Replacing it with conditioned make-up air is a major cost. Kitchen heat recovery captures the sensible heat while keeping grease and smoke out of the supply. Why Separation Matters in Kitchens Exhaust carries grease aerosol and odors, so any recovery device […]
换热器清洗与维护指南
Heat recovery equipment only delivers its rated savings if it stays clean. Dust, grease, and moisture film raise pressure drop and lower effectiveness. A simple maintenance plan protects the investment. General Inspection Schedule Environment Inspect Clean Clean office air Every 6 months Annually Dusty / industrial Quarterly When dP +15-20 % Greasy (kitchen, booth) Monthly […]
空气-空气 vs 空气-水 热回收
Heat recovery comes in two broad forms. Air-to-air exchangers move heat directly between two air streams. Air-to-water devices (like run-around coils or exhaust water heaters) transfer heat into a fluid loop that can serve distant or mixed loads. Side-by-Side Factor Air-to-Air Air-to-Water Streams Two air ducts Air + water/glycol loop Distance Short (cores co-located) Long […]
热回收系统的防冻保护
In cold climates, exhaust air can be warm and humid while intake is far below freezing. When that exhaust cools below its dew point inside the core, frost forms. Left unchecked, ice blocks the airflow entirely. Why Frost Happens Frost appears when exhaust outlet temperature drops near 0 C and the core surface is below […]
热回收标准与认证
When you specify or buy a heat recovery unit, third-party standards tell you the numbers are comparable and real. Knowing the key marks helps avoid inflated claims. Testing Standards AHRI 1060: North American rating method for air-to-air heat exchangers. EN 308: European test method for heat transfer in recovery components. ISO 16494: International method for […]
热回收投资回收计算
Before buying a recovery unit, a quick payback calculation shows whether it makes sense. You only need a few field numbers and the local energy price. The Core Formula Annual energy saved (kWh) = 1.2 x airflow (m3/h) x eta x dT (C) x hours/year / 1000 Where 1.2 is the approximate volumetric heat capacity […]
为HVAC改造选换热器
Retrofitting heat recovery into an existing building is different from designing new. Space, duct layout, and control integration usually drive the choice more than peak efficiency. Step 1: Audit the Air Streams Confirm there is a dedicated exhaust and a matching supply. Measure airflow (m³/h or CFM) and temperature profiles. Note operating hours — recovery […]