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Title: Retrofit device and method to improve humidity control of vapor compression cooling systems

Abstract

A method and device for improving moisture removal capacity of a vapor compression system is disclosed. The vapor compression system is started up with the evaporator blower initially set to a high speed. A relative humidity in a return air stream is measured with the evaporator blower operating at the high speed. If the measured humidity is above the predetermined high relative humidity value, the evaporator blower speed is reduced from the initially set high speed to the lowest possible speed. The device is a control board connected with the blower and uses a predetermined change in measured relative humidity to control the blower motor speed.

Inventors:
; ;
Publication Date:
Research Org.:
Mainstream Engineering Corporation, Rockledge, FL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1295763
Patent Number(s):
9,417,005
Application Number:
13/548,828
Assignee:
Mainstream Engineering Corporation (Rockledge, FL CHO
DOE Contract Number:
SC0003289
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Jul 13
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Roth, Robert Paul, Hahn, David C., and Scaringe, Robert P. Retrofit device and method to improve humidity control of vapor compression cooling systems. United States: N. p., 2016. Web.
Roth, Robert Paul, Hahn, David C., & Scaringe, Robert P. Retrofit device and method to improve humidity control of vapor compression cooling systems. United States.
Roth, Robert Paul, Hahn, David C., and Scaringe, Robert P. 2016. "Retrofit device and method to improve humidity control of vapor compression cooling systems". United States. doi:. https://www.osti.gov/servlets/purl/1295763.
@article{osti_1295763,
title = {Retrofit device and method to improve humidity control of vapor compression cooling systems},
author = {Roth, Robert Paul and Hahn, David C. and Scaringe, Robert P.},
abstractNote = {A method and device for improving moisture removal capacity of a vapor compression system is disclosed. The vapor compression system is started up with the evaporator blower initially set to a high speed. A relative humidity in a return air stream is measured with the evaporator blower operating at the high speed. If the measured humidity is above the predetermined high relative humidity value, the evaporator blower speed is reduced from the initially set high speed to the lowest possible speed. The device is a control board connected with the blower and uses a predetermined change in measured relative humidity to control the blower motor speed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Patent:

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  • A device and method are provided to improve performance of a vapor compression system using a retrofittable control board to start up the vapor compression system with the evaporator blower initially set to a high speed. A baseline evaporator operating temperature with the evaporator blower operating at the high speed is recorded, and then the device detects if a predetermined acceptable change in evaporator temperature has occurred. The evaporator blower speed is reduced from the initially set high speed as long as there is only a negligible change in the measured evaporator temperature and therefore a negligible difference in themore » compressor's power consumption so as to obtain a net increase in the Coefficient of Performance.« less
  • Recovery of substantially all of the work associated with the expansion of a multi-component working fluid mixture in a vapor compression cycle device is enabled by conveying working fluid in a liquid phase from a condenser to a coldest portion of an evaporator assembly in a countercurrent heat exchange relationship with fluid flowing through the evaporator assembly.
  • A method for improving fluidization of a particulate material flowing through a fluid conductor is provided by controlling the rate of addition of fluid, such as aerating gas or steam at a plurality of spaced apart locations along the conduit. The composition and rate of flow of the fluidized particles, is controlled by positioning a source of penetrative radiation such as neutrons, gamma rays, or X-rays at any location along the conduit so that the radiation traverses the fluidized particulate material flowing therein. A radiation detector is positioned opposite the source so that radiation absorbed in the conduit by themore » fluidized mixture may be measured as an electrical quantity. This electrical quantity may represent the total number of gamma rays of a preselected energy interacting with a detector in a given time interval or the average number of all gamma rays generating electrical pulses by interaction with the radiation detector. In accordance with such measured electrical quantity, the flow rate of aerating gas into the conduit is adjusted to maintain a stable composition and flow rate of the particulate material. This method is applicable to a fluid catalytic cracking system to control continuously circulated catalyst in an aeration gas, such as steam. By proper control of steam at a plurality of positions along the conduits, a homogenous dispersion of gas bubbles and particulate material at a given mixture is obtained.« less
  • Cryogen spray cooling of skin surface with millisecond cryogen spurts is an effective method for establishing a controlled temperature distribution in tissue and protecting the epidermis from nonspecific thermal injury during laser mediated dermatological procedures. Control of humidity level, spraying distance and cryogen boiling point is material to the resulting surface temperature. Decreasing the ambient humidity level results in less ice formation on the skin surface without altering the surface temperature during the cryogen spurt. For a particular delivery nozzle, increasing the spraying distance to 85 millimeters lowers the surface temperature. The methodology comprises establishing a controlled humidity level inmore » the theater of operation of the irradiation site of the biological tissues before and/or during the cryogenic spray cooling of the biological tissue. At cold temperatures calibration was achieved by mounting a thermistor on a thermoelectric cooler. The thermal electric cooler was cooled from from 20.degree. C. to about -20.degree. C. while measuring its infrared emission.« less
  • Cryogen spray cooling of skin surface with millisecond cryogen spurts is an effective method for establishing a controlled temperature distribution in tissue and protecting the epidermis from nonspecific thermal injury during laser mediated dermatological procedures. Control of humidity level, spraying distance and cryogen boiling point is material to the resulting surface temperature. Decreasing the ambient humidity level results in less ice formation on the skin surface without altering the surface temperature during the cryogen spurt. For a particular delivery nozzle, increasing the spraying distance to 85 millimeters lowers the surface temperature. The methodology comprises establishing a controlled humidity level inmore » the theater of operation of the irradiation site of the biological tissues before and/or during the cryogenic spray cooling of the biological tissue. At cold temperatures calibration was achieved by mounting a thermistor on a thermoelectric cooler. The thermal electric cooler was cooled from 20 C to about {minus}20 C while measuring its infrared emission.« less