PatentsALERT XI NEW REFRIGERANTS AND REFRIGERATION SYSTEMS 35395 LEAK DETECTION IN HEATING, VENTILATING AND AIR CONDITIONING SYSTEMS USING AN ENVIRONMENTALLY SAFE MATERIAL Henry Richard Mayfield Heights, OH, UNITED STATES assigned to Bright Solutions Inc Refrigerant leakage in heating, ventilating and air conditioning systems employing hydrofluorocarbon refrigerants is determined by adding a mixture including predetermined amounts of a napthalamide optical brightner to the system. Inspection of the system under ultraviolet light provides an indication of any leakage occuring in the system of liquid and/or gas. 5586445 LOW REFRIGERANT CHARGE DETECTION USING A COMBINED PRESSURE/TEMPERATURE SENSOR Bessler Warren Schenectady, NY, UNITED STATES assigned to General Electric Company Low refrigerant charge in a refrigeration system is detected by monitoring the compressor discharge pressure and temperature. This monitoring is accomplished with a combined pressure/temperature sensor located at or near the compressor outlet. The sensor output signals are fed to a controller which produces a low charge signal whenever a combination of high discharge temperature and a low discharge pressure is detected. The controller can optionally receive input of additional operating characteristics of the refrigeration system to provide a more accurate low charge signal. The controller is connected to an indicator and/or the compressor so that the low charge signal activates the indicator and/or deactivates the compressor. 5597037 HEAT EXCHANGING APPARATUS Asada Kazuhiko; Ueno Koichi; Kashihara Shin-ichiro; Okamoto Shigemi; Kurose Katsuo; Kuwahara Kazuhiko; Mitsuhashi Ken-ichiro Takasago, JAPAN assigned to Kabushiki Kaisha Kobe Seiko Sho PCT No. PCT/JP95/00360 Sec. 371 Date Nov. 7, 1995 Sec. 102(e) Date Nov. 7, 1995 PCT Filed Mar. 7, 1995 PCT Pub. No. WO95/24595 PCT Pub. Date Sep. 14, 1995. An object of the present invention is to minimize a volume of a hollow body by a combination of a horizontal H-letter shaped type gas-liquid separator and a plurality of plate-fin heat exchangers having a larger heat exchange performance per volume. In the present heat exchanging apparatus, fluid and refrigerants flow about in the hollow body through pipes while gas and liquid phases of the refrigerants are repeatedly separated and mixed for heat exchange between the fluid and the refrigerants. The apparatus comprises a plurality of plate-fin heat exchangers for exchanging heat between the refrigerants and the fluid, and a gas-liquid separator including upper and lower accommodation portions which are hollow cylinders laid in a horizontal direction both ends of which are airtightly sealed and an intermediate accommodation portion which connects the upper accommodation portion to the lower accommodation portion so as to form a sideways H-letter shape.

5597037 Heat exchanging apparatus

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Page 1: 5597037 Heat exchanging apparatus

PatentsALERT XI

NEW REFRIGERANTS AND REFRIGERATION SYSTEMS

35395

LEAK DETECTION IN HEATING, VENTILATING AND AIR

CONDITIONING SYSTEMS USING AN ENVIRONMENTALLY SAFE

MATERIAL

Henry Richard Mayfield Heights, OH, UNITED STATES assigned to Bright Solutions Inc

Refrigerant leakage in heating, ventilating and air conditioning systems employing hydrofluorocarbon refrigerants is determined by adding a mixture including predetermined amounts of a napthalamide optical brightner to the system. Inspection of the system under ultraviolet light provides an indication of any leakage occuring in the system of liquid and/or gas.

5586445

LOW REFRIGERANT CHARGE DETECTION USING A COMBINED

PRESSURE/TEMPERATURE SENSOR

Bessler Warren Schenectady, NY, UNITED STATES assigned to General Electric Company

Low refrigerant charge in a refrigeration system is detected by monitoring the compressor discharge pressure and temperature. This monitoring is accomplished with a combined pressure/temperature sensor located at or near the compressor outlet. The sensor output signals are fed to a controller which produces a low charge signal whenever a combination of high discharge

temperature and a low discharge pressure is detected. The controller can optionally receive input of additional operating characteristics of the refrigeration system to provide a more accurate low charge signal. The controller is connected to an indicator and/or the compressor so that the low charge signal activates the indicator and/or deactivates the compressor.

5597037

HEAT EXCHANGING APPARATUS

Asada Kazuhiko; Ueno Koichi; Kashihara Shin-ichiro; Okamoto Shigemi; Kurose Katsuo; Kuwahara Kazuhiko; Mitsuhashi Ken-ichiro Takasago, JAPAN assigned to Kabushiki Kaisha Kobe Seiko Sho

PCT No. PCT/JP95/00360 Sec. 371 Date Nov. 7, 1995 Sec. 102(e) Date Nov. 7, 1995 PCT Filed Mar. 7, 1995 PCT Pub. No. WO95/24595 PCT Pub. Date Sep. 14, 1995. An object of the present invention is to minimize a volume of a hollow body by a combination of a horizontal H-letter shaped type gas-liquid separator and a plurality of plate-fin heat exchangers having a larger heat exchange performance per volume. In the present heat exchanging apparatus, fluid and refrigerants flow about in the hollow body through pipes while gas and liquid phases of the refrigerants are repeatedly separated and mixed for heat exchange between the fluid and the refrigerants. The apparatus comprises a plurality of plate-fin heat exchangers for exchanging heat between the refrigerants and the fluid, and a gas-liquid separator including upper and lower accommodation portions which are hollow cylinders laid in a horizontal direction both ends of which are airtightly sealed and an intermediate accommodation portion which connects the upper accommodation portion to the lower accommodation portion so as to form a sideways H-letter shape.