Automated technique of measuring room air change rates in HVAC system
First Claim
1. A method for estimating an air change rate of a room of a building using heating, ventilation and air conditioning (HVAC) equipment supplying conditioned air to the room, comprising:
- monitoring temperature of the room;
making one or more changes to air flow rate and/or supply temperature of the conditioned air supplied to the room; and
determining an air change rate of the room using a response of the temperature of the room to the one or more changes,wherein determining the air change rate includes performing a model-based mathematical calculation including one or more first-order differential equations for a relationship between a time rate of change of room air temperature and the air change rate,and wherein the model-based mathematical calculation includes a contribution to the time rate of change of room air temperature from a wall temperature of one or more of walls, ceiling and floor of the room.
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Abstract
An HVAC system employs a technique built around a system identification/modeling method that determines critical building loads and airflows experimentally without relying on design plans or statistical modeling approaches. Operation includes observing the dynamic response of individual room temperature, in response to a change of inlet air flow conditions (either air flow rate and/or supply air temperature). This empirically-based model enables development of an optimized control approach that minimizes conditioned airflow while meeting required ventilation, thermal, and humidification performance objectives. Building-wide performance is achieved by aggregating empirically determined room-level loads, thus ensuring that the coupled performance objectives can be achieved while minimizing energy use for every space within a building.
35 Citations
17 Claims
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1. A method for estimating an air change rate of a room of a building using heating, ventilation and air conditioning (HVAC) equipment supplying conditioned air to the room, comprising:
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monitoring temperature of the room; making one or more changes to air flow rate and/or supply temperature of the conditioned air supplied to the room; and determining an air change rate of the room using a response of the temperature of the room to the one or more changes, wherein determining the air change rate includes performing a model-based mathematical calculation including one or more first-order differential equations for a relationship between a time rate of change of room air temperature and the air change rate, and wherein the model-based mathematical calculation includes a contribution to the time rate of change of room air temperature from a wall temperature of one or more of walls, ceiling and floor of the room. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification