Method of using a thermal expansion valve device, evaporator and

Details Method of using a thermal expansion valve device, evaporator and Method of using a thermal expansion valve device, evaporator and

1991-04-26

1993-03-23

Wayner, William

Refrigeration

Automatic control

Refrigeration producer

62225, G05D 2330

Patent

active

051953315

ABSTRACT:
The expansion valve 103 of the refrigerating machine is controlled by the difference between the pressure in a bulb 104 containing a fixed amount of fluid and the pressure in the evaporator 2. The bulb is mounted in the discharge pipe 1 of the evaporator and is heated by a resistor. In the absence of droplets of liquid refrigerant in the flow through the discharge pipe, i.e when the refrigerant flow rate tends to become too low with respect to the cold demand, the resistor heats up the fluid in the bulb, the pressure in the bulb increases and moves the expansion valve to a more opened position. As soon as droplets hit the bulb in the discharge pipe, said droplets cool down the bulb despite the heating effect of the resistor and the expansion valve is moved to a more closed position. Thus, the flow rate control uses variations in heat transfer coefficients in the discharge pipe rather than superheat temperature in the discharge pipe. The evaporator may be small-sized because it does not have to produce superheat.

REFERENCES:
patent: 1408744 (1922-03-01), Keen et al.
patent: 1902784 (1933-03-01), Larkin
patent: 1969102 (1934-08-01), Shenton et al.
patent: 2078966 (1937-05-01), Newill
patent: 2279787 (1942-04-01), Huggins
patent: 2534455 (1950-12-01), Koontz
patent: 2624181 (1953-01-01), Erwin et al.
patent: 2857106 (1958-10-01), Porland
patent: 4467613 (1984-08-01), Behr et al.
Refrigeration & Air Conditioning, Jordon et al. May 1948, p. 45.
Engineering Thermodynamics, H. J. Stoever Sep. 1956 p. 28.

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