Abstract: A gas-fired atmospheric pressure steam humidifier having high efficiency and ultra-low NOx(3) emissions is disclosed. In some examples, the gas-fired humidifier can have an efficiency of greater than 90 percent and a NOx(3) output of less than 20 parts per million (ppm). In one aspect, the humidifier includes a secondary heat exchanger having a first heat exchange section for pre-heating combustion air and a separate second heat exchange section for pre-heating make-up water, wherein the first and second heat exchange sections are in heat transfer communication with exhaust gases generated by the gas-fired burner and combustion blower assembly. In some examples, the first heat exchange section includes orifices for enabling flue gas recirculation.

Abstract: A gas-fired atmospheric pressure steam humidifier having high efficiency and ultra-low NOx(3) emissions is disclosed. In some examples, the gas-fired humidifier can have an efficiency of greater than 90 percent and a NOx(3) output of less than 20 parts per million (ppm). In one aspect, the humidifier includes a secondary heat exchanger having a first heat exchange section for pre-heating combustion air and a separate second heat exchange section for pre-heating make-up water, wherein the first and second heat exchange sections are in heat transfer communication with exhaust gases generated by the gas-fired burner and combustion blower assembly. In some examples, the first heat exchange section includes orifices for enabling flue gas recirculation.

Abstract: A gas-fired atmospheric pressure steam humidifier having high efficiency and ultra-low NOx(3) emissions is disclosed. In some examples, the gas-fired humidifier can have an efficiency of greater than 90 percent and a NOx(3) output of less than 20 parts per million (ppm). In one aspect, the humidifier includes a secondary heat exchanger having a first heat exchange section for pre-heating combustion air and a separate second heat exchange section for pre-heating make-up water, wherein the first and second heat exchange sections are in heat transfer communication with exhaust gases generated by the gas-fired burner and combustion blower assembly. In some examples, the first heat exchange section includes orifices for enabling flue gas recirculation.

Abstract: A method includes performing by a host system processor: receiving a record insert request for a database, the record insert request comprising a primary key value and a semi-unique key value, the database comprising a record structure comprising a first primary key field, a second primary key field, and a semi-unique key field, the first primary key field comprising a flag portion for which a first flag value is indicative of the first primary key field containing a primary key and a second flag value is indicative of the first primary key field containing an alternate primary key, generating an alternate primary key value based on the primary key value and the semi-unique key value, the alternate primary key value having a portion thereof corresponding to the flag portion of the first primary key field set to the second flag value, generating a record comprising the alternate primary key value in the first primary key field, the primary key value in the second primary key field, and the semi-unique key valu

Abstract: A gas-fired atmospheric pressure steam humidifier having high efficiency and ultra-low NOx(3) emissions is disclosed. In some examples, the gas-fired humidifier can have an efficiency of greater than 90 percent and a NOx(3) output of less than 20 parts per million (ppm). In one aspect, the humidifier includes a secondary heat exchanger having a first heat exchange section for pre-heating combustion air and a separate second heat exchange section for pre-heating make-up water, wherein the first and second heat exchange sections are in heat transfer communication with exhaust gases generated by the gas-fired burner and combustion blower assembly. In some examples, the first heat exchange section includes orifices for enabling flue gas recirculation.

Abstract: An enclosure includes a base. A frame includes a plurality of frame members. The frame members are coupled together and to the base using clips. Each clip includes a base coupled to a side surface of a first frame member. The clip further includes at least one lip extending from the base. The lip is sufficiently raised from the side surface of the first frame member to accept at least a portion of a second frame member between the lip and the side surface. A plurality of panels is coupled to the frame members. At least one panel is coupled to the base.

Abstract: An improved heat exchanger for the transfer of heat between a first and second fluid includes a shell enclosure, tube means, fluidized bed of particles, and a distributor plate. The first fluid is passed through the shell. Tubes positioned in the shell contain the bed particles through which the second fluid passes so as to fluidize the bed of particles. Heat is transferred between the fluids. The fluidized particles enhance heat transfer and mitigate the deposition of material on the tube walls.