Method of control of thermal energy module background of the...

Details Method of control of thermal energy module background of the... Method of control of thermal energy module background of the...

2009-05-07

2010-11-16

Tapolcai, William E (Department: 3744)

Refrigeration

Processes

Accumulating holdover ice in situ

C062S139000

Reexamination Certificate

active

07832217

ABSTRACT:
A control system measures the pressure/temperature of the refrigerant within a Thermal Energy Module having a heat exchanger and calculates the thickness of ice within the Thermal Energy Module. A controller calculates an integral starting from the moment when ice accumulation begins: I(t)=∫Tr(τ)*dτ where Tr is the refrigerant saturation temperature changing with time t. The thickness of the ice on one side of the heat exchanger can be calculated using the following formula: X=√(2*I*K*Ui/ρi/ci) where Ui is the thermal conductance of ice ρi is the density of the ice Ci is the latent heat of the ice K is a correction coefficient associated with the type of the heat exchanger.

REFERENCES:
patent: 4609036 (1986-09-01), Schrader
patent: 4735064 (1988-04-01), Fischer
patent: 7363772 (2008-04-01), Narayanamurthy
patent: 7441558 (2008-10-01), Leifer et al.
patent: 7503185 (2009-03-01), Narayanamurthy

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