US Patent No. 9,907,214

SYSTEMS AND METHODS FOR AIR CONDITIONING A BUILDING USING AN ENERGY RECOVERY WHEEL


Patent No. 9,907,214
Issue Date February 27, 2018
Title Systems And Methods For Air Conditioning A Building Using An Energy Recovery Wheel
Inventorship James F. Dagley, Cleveland, OH (US)
Jonathan D. West, York, PA (US)
Christos A. Polyzois, Minneapolis, MN (US)
Kevin Swank, Cleveland, OH (US)
Assignee Johnson Controls Technology Company, Auburn Hills, MI (US)

Claim of US Patent No. 9,907,214

1. A system for air conditioning a building, the system comprising:
a rotatable energy recovery wheel configured to rotate successively through a first air stream and a second air stream separate
from the first air stream, wherein the energy recovery wheel is configured to transfer heat between the first air stream and
the second air stream, wherein at least one of the first air stream and the second air stream is a recirculated air stream;

a refrigeration circuit configured to circulate a refrigerant through a cooling coil arranged in the first air stream and
through a condenser arranged in the second air stream, wherein the refrigeration circuit includes a pressure sensor configured
to measure a pressure of the refrigerant at the condenser;

a first temperature sensor configured to measure a first temperature of the recirculated air stream upstream of the energy
recovery wheel and a second temperature sensor configured to measure a second temperature of the recirculated air stream downstream
of the energy recovery wheel; and

a controller configured to receive measurements from the pressure sensor and the first and second temperature sensors, wherein
the controller is configured to operate the energy recovery wheel and the refrigeration circuit based on the measured pressure
of the refrigerant at the condenser and the measured temperatures of the recirculated air stream, wherein operating the energy
recovery wheel and the refrigeration circuit comprises:

calculating a temperature differential of the recirculated air stream across the energy recovery wheel by subtracting the
first temperature from the second temperature;

activating or deactivating the energy recovery wheel based on the calculated temperature differential of the recirculated
air stream across the energy recovery wheel; and

activating or deactivating the refrigeration circuit based on the calculated temperature differential of the recirculated
air stream across the energy recovery wheel.