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Pressure controlled fresh air supply ventilation system using soil gas pressure as a reference, and method of use

  • US 5,131,887 A
  • Filed: 03/25/1991
  • Issued: 07/21/1992
  • Est. Priority Date: 12/27/1989
  • Status: Expired due to Fees
First Claim
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1. A ventilation system for use in an enclosed space, which enclosed space is equipped with a heating and/or air conditioning system comprised of a cold air return, a blower fan and an air filter;

  • which ventilation system comprises, in combination with the heating and/or air conditioning system, a series combination of an air prefilter and fresh air supply device, which air prefilter and fresh air supply device are attached to one another by way of a common duct, which common duct, at one end thereof, has access to the atmosphere outside the enclosed space, and which common duct, at the other end thereof, attaches to, and opens into the cold air return of the heating and/or air conditioning system of the enclosed space;

    which enclosed space heating and/or air conditioning system is fashioned such that essentially all air entering the cold air return passes through the air filter and is caused by the blower fan of the heating and/or air conditioning system to flow within the enclosed space and either leave through openings in the enclosed space, such as air leaks, open doors or windows, chimneys and air exhaust systems, or return to the cold air return;

    which ventilation system further comprises a pressure differential monitoring sensor, which pressure differential monitoring sensor monitors the air pressure inside the enclosed space and also monitors soil gas pressure beneath the foundation or floor of the lowest occupied level of the enclosed space, for use as a reference, without significantly altering said soil gas pressure;

    which pressure differential monitoring sensor produces a signal in response to the difference between the two identified pressures, which signal is used to regulate the operation of the fresh air supply device so as to increase inlet fresh air volume inflow rate when the air pressure in the enclosed space is at a level, when compared to the soil gas pressure, lower than a user selected level, so that the air pressure inside the enclosed space is increased, and to otherwise cause operation at a user selected minimum inlet fresh air volume inflow rate sufficient to maintain a healthy air quality environment inside the enclosed space.

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