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Determining the coefficient of performance of a refrigeration system
| Details |
Inventors: Mathur, Anoop K.;
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Examiner: Tanner; Harry B.
Assistant Examiner:
Attorney, Agent or Firm: Mersereau; C. G., Easton; W. B.
The disclosure involves a coefficient-of-performance (COP) diagnostic method involving the use of novel algorithms for determining performance manifested faults of vapor compression type refrigeration systems. |
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DETAILED DESCRIPTION What is claimed: 1.
A method for reducing the coefficient of performance to a design value from measured temperature conditions of a vapor compression type refrigeration system of the type having series arranged compressor, condenser and evaporator units and an electric motor for driving said compressor unit, said system further having a condenser water supply line and evaporator chilled water supply and return lines, said method comprising the steps of: storing a value (CWF) for the chilled water flow through said condenser; sensing the condenser water supply temperature (T.
sub.
con), sensing the evaporator water supply and return temperatures (T.
sub.
chw,in and T.
sub.
chw,out), sensing the power input (.
phi.
) to said motor; calculating the cooling load (Q.
sub.
c)* from the expression Q.
sub.
c =CWF*(T.
sub.
chw,in -T.
sub.
chw,out); storing the manufacturers' performance data for said system comprising the condenser supply water design (T.
sub.
con,D) and the evaporator return water design temperature (T.
sub.
chw,D); storing a value (.
alpha.
.
sub.
temp) which is the ratio of the required change in condenser temperature to a unit change in chilled water temperature to maintain the same rated chiller capacity; calculating the equivalent temperature (T.
sub.
r) which compensates for variation from the given design temperatures from the expression T.
sub.
r =(T.
sub.
con -T.
sub.
con,D)/.
alpha.
.
sub.
temp -(T.
sub.
chw -T.
sub.
chw,D), storing experimentally determined coefficients b.
sub.
1, b.
sub.
2, and b.
sub.
3 for the quadratic expression .
beta.
cap=b.
sub.
1 +b.
sub.
2 *T.
sub.
r +b.
sub.
3 *(T.
sub.
r).
sup.
2 wherein .
beta.
.
sub.
cap is the ratio of the available capacity (CAP) at the actual chilled water and condenser water conditions to the design capacity (CAP.
sub.
D); calculating said .
beta.
.
sub.
cap and said CAP; calculating the part-load ratio .
GAMMA.
.
sub.
load from the expression .
GAMMA.
.
sub.
load =Q.
sub.
c /CAP, storing experimentally determined coefficients a.
sub.
1, a.
sub.
2 and a.
sub.
3 for the quadratic expression
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Heat Accumulators 
