Bry Air Heat Recovery Wheel Software Applications

A heat-recovery system captures building exhaust air and reuse some of the energy to precondition the make-up air before supplying it to the building. Air-to-air heat-recovery systems for comfort applications can in general be categorized as • sensible heat (dry bulb only) systems • total heat (wet bulb - sensible heat plus latent heat) systems Sensible Heat-Recovery Systems A sensible heat-recovery systems will transfer sensible (dry-bulb) heat from the exhaust air to the supply air entering the building. Rotary wheel heat exchangers and cross flow heat exchangers are some of the common designs used in typical comfort-to-comfort sensible heat-recovery applications. The amount of heat transferred can be expressed as H = 1.08 q (t 2 - t 1) η (1) where H = heat transferred (Btu/h) q = quantity of airflow (cfm) t 1 = air temperature of the exhaust air before the heat recovery unit ( oF) t 2 = air temperature of outside air after the heat recovery unit ( oF) η = heat-recover efficiency Example - A Sensible Heat Recovery System The outside air temperature is 90ºF and the exhaust air temperature is 75ºF. The system operates at 40,000 cfm at 73 percent efficiency. Mytheatre v4 0 130 cracked 2. The sensible heat-recovery can be expressed as H = 1.08 (40000 cfm) ((90 oF) - (75 oF)) 0.73 = 473040 (Btu/h) A Sensible Heat Recovery Calculator The calculator below can be used to calculate the sensible heat recovery where the air flow, outside and inside temperature and recovery efficiency are known. Q - air flow (cfm) t 1 - outside air temperature before the heat exchanger ( oF) t 2 - outside air temperature after the heat exchanger ( oF) η - heat recovery unit efficiency Total Enthalpy Heat Recovery System For total enthalpy heat-recovery systems the heat recovered can be expressed as H = 4.5 q (h 2 - h 1) η (2) where h 1 = air enthalpy of the exhaust air before the heat recovery unit (Btu/lbºF) h 2 = air enthalpy of outside air after the heat recovery unit (Btu/lbºF) Related Mobile Apps from The Engineering ToolBox • - free apps for offline use on mobile devices.

Example - Total Enthalpy Heat Recovery System The outside air wet-bulb temperature is 70ºF (enthalpy 34.1 Btu/lbºF) and the exhaust-air wet-bulb temperature is 60ºF (enthalpy 26.5 Btu/lbºF). The system operates at 40,000 cfm at 73 percent efficiency. The total heat-recovery can be expressed like H = 4.5 (40000 cfm) ((34.1 Btu/lbºF) - (26.5 Btu/lbºF)) 0. 73 = 998640 (Btu/h) A Total Heat Recovery Calculator The calculator below can be used to calculate the total (latent and sensible) heat recovery where the air flow, enthalpy of outside and inside air and the recovery efficiency are known. Q - air flow (cfm) h 2 - enthalpy outside air before the heat recovery unit (Btu/lbºF) h 1 - enthalpy outside air after the heat recovery unit (Btu/lbºF) η - heat recovery unit efficiency. We don't collect information from our users.

Energy Recovery System/Fresh Air Solution. Treated Fresh Units Energy Recovery Ventilators Dedicated outdoor air system: Dehumidifiers and Dryers Gas Phase Filtration Adsorption Chiller Plastics Auxiliary Equipment High Temperature Heat Recovery Wheel. Desiccant wheels and energy recovery wheels are two types of wheels used in HVAC. For example in the Bry Air design manual as well as the Munters design manual. In this application the term “rotational driver” or similar has the same.

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