US2014216704A1PendingUtilityA1
Method for operating an hvac system
Est. expiryFeb 7, 2033(~6.5 yrs left)· nominal 20-yr term from priority
F24F 11/63F24F 11/46F24F 11/62F24F 11/65F24F 11/30F24F 11/64F28F 27/00
48
PatentIndex Score
0
Cited by
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References
0
Claims
Abstract
A method for operating an HVAC system is provided. The method includes providing a model for an indoor temperature, y, of a building, providing predicted future outdoor temperatures, and calculating an activation time or an adjustment time interval for the HVAC system utilizing at least the model for y and the predicted future outdoor temperatures. Operation of the HVAC system can be improved with the activation time or the adjustment time interval.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method for operating an HVAC system, the HVAC system configured for cooling air within a building, heating air within the building, or both, the method comprising:
providing a model for an indoor temperature, y, of the building; providing predicted future outdoor temperatures; calculating an adjustment time interval for the HVAC system utilizing at least the model for y and the predicted future outdoor temperatures.
2 . The method of claim 1 , wherein the adjustment time interval corresponds to a period of time required for the HVAC system to adjust the indoor temperature of the building from an initial temperature, T 0 , to a final temperature, T f , wherein T 0 and T f are unequal.
3 . The method of claim 2 , further comprising:
determining an initial time, t 0 , at which the indoor temperature of the building is T 0 and a final time, t f , at which the indoor temperature of the building is T f , the adjustment time interval corresponding to the difference between t 0 and t f ; and activating the HVAC system at t 0 such the indoor temperature of the building is T f at t f .
4 . The method of claim 1 , wherein the model for y comprises a second order linear model.
5 . The method of claim 4 , wherein the model for y comprises
y k =a 1 y k−1 +a 2 y k−2 +b 1 v k−1 +b 2 u k−1
where
y k is an indoor temperature of the building at time k,
y k−1 is an indoor temperature of the building at time k−1,
y k−2 is an indoor temperature of the building at time k−2,
v k−1 is an outdoor temperature at time k−1,
u k−1 is an operating state of the HVAC system at time k−1, and
a 1 , a 2 , b 1 , and b 2 are constants.
6 . The method of claim 1 , wherein said step of calculating comprises calculating the adjustment time interval with the following:
y
f
=
CA
k
x
k
0
+
∑
i
=
0
N
-
1
CA
N
-
i
-
1
BU
i
where
C
=
[
1
0
]
,
A
=
[
a
1
a
2
1
0
]
,
B
=
[
b
1
b
2
1
0
]
,
x
k
0
=
[
y
k
0
y
k
0
-
1
]
,
U
i
=
[
v
i
u
i
]
,
and
N=k f −k 0 where k 0 is an initial time at which the indoor temperature of the building is an initial temperature, y k 0 , and k f is a final time at which the indoor temperature of the building is a final temperature, y k f .
7 . The method of claim 1 , wherein said step of calculating comprises calculating the adjustment time interval in order to minimize energy consumption of the HVAC system.
8 . The method of claim 7 , wherein said step of calculating comprises calculating the adjustment time interval with the following:
T
←
CA
N
x
k
0
+
∑
i
=
0
N
-
1
(
CA
N
-
i
-
1
B
)
1
v
i
k
*
←
k
f
-
1
while
T
<
T
f
do
T
←
T
+
(
CA
k
f
-
k
*
B
)
2
k
*
←
k
*
-
1
end
while
where
T is the indoor temperature of the building and
k* is a time value.
9 . The method of claim 1 , wherein said step of providing predicted future outdoor temperatures comprises determining predicted future outdoor temperatures based upon weather forecast data.
10 . The method of claim 9 , wherein said step of providing predicted future outdoor temperatures comprises providing predicted future outdoor temperatures using the following:
f
(
t
)
=
{
T
max
(
k
)
+
T
min
(
k
)
2
-
T
max
(
k
)
-
T
min
(
k
)
2
cos
(
π
(
t
-
t
min
(
k
)
)
t
max
(
k
)
-
t
min
(
k
)
)
t
∈
[
t
min
(
k
)
,
t
max
(
k
)
)
T
max
(
k
)
+
T
min
(
k
+
1
)
2
+
T
max
(
k
)
-
T
min
(
k
+
1
)
2
cos
(
π
(
t
-
t
max
(
k
)
)
t
min
(
k
+
1
)
-
t
max
(
k
)
)
t
∈
[
t
max
(
k
)
,
t
min
(
k
+
1
)
)
where
T max (k) is a maximum temperature on day k,
T min (k) is a minimum temperature on day k,
t max (k) is a time of day for T max (k), and
t min (k) is a time of day for T min (k).
11 . A method for operating an HVAC system, the HVAC system configured for cooling air within a building, heating air within the building, or both, the method comprising:
providing a model for an interior temperature, y, of the building; providing predicted future exterior temperatures of the building; calculating an activation time for the HVAC system utilizing at least the model for y and the predicted future outdoor temperatures.
12 . The method of claim 1 , further comprising:
turning on the HVAC system at the activation time; and running the HVAC system in order to adjust the indoor temperature of the building from an initial temperature, T 0 , to a final temperature, T f , after said step of turning on.
13 . The method of claim 1 , wherein the model for y comprises a second order linear model.
14 . The method of claim 13 , wherein the model for y comprises
y k =a 1 y k−1 +a 2 y k−2 +b 1 v k−1 +b 2 u k−1
where
y k is an indoor temperature of the building at time k,
y k−1 is an indoor temperature of the building at time k−1,
y k−2 is an indoor temperature of the building at time k−2,
v k−1 is an outdoor temperature at time k−1,
u k−1 is an operating state of the HVAC system at time k−1, and
a 1 , a 2 , b 1 , and b 2 are constants.
15 . The method of claim 1 , wherein said step of calculating comprises calculating the activation time with the following:
y
f
=
CA
k
x
k
0
+
∑
i
=
0
N
-
1
CA
N
-
i
-
1
BU
i
where
C
=
[
1
0
]
,
A
=
[
a
1
a
2
1
0
]
,
B
=
[
b
1
b
2
1
0
]
,
x
k
0
=
[
y
k
0
y
k
0
-
1
]
,
U
i
=
[
v
i
u
i
]
,
and
N=k f −k 0 where k 0 is the activation time at which the indoor temperature of the building is an initial temperature, y k 0 , and k f is a final time at which the indoor temperature of the building is a final temperature, y k f .
16 . The method of claim 1 , wherein said step of calculating comprises calculating the activation time in order to minimize energy consumption of the HVAC system.
17 . The method of claim 16 , wherein said step of calculating comprises calculating the activation time with the following:
T
←
CA
N
x
k
0
+
∑
i
=
0
N
-
1
(
CA
N
-
i
-
1
B
)
1
v
i
k
*
←
k
f
-
1
while
T
<
T
f
do
T
←
T
+
(
CA
k
f
-
k
*
B
)
2
k
*
←
k
*
-
1
end
while
where
T is the indoor temperature of the building and
k* is the activation time.
18 . The method of claim 1 , wherein said step of providing predicted future outdoor temperatures comprises determining predicted future outdoor temperatures based upon weather forecast data.
19 . The method of claim 18 , wherein said step of providing predicted future outdoor temperatures comprises providing predicted future outdoor temperatures using the following:
f
(
t
)
=
{
T
max
(
k
)
+
T
min
(
k
)
2
-
T
max
(
k
)
-
T
min
(
k
)
2
cos
(
π
(
t
-
t
min
(
k
)
)
t
max
(
k
)
-
t
min
(
k
)
)
t
∈
[
t
min
(
k
)
,
t
max
(
k
)
)
T
max
(
k
)
+
T
min
(
k
+
1
)
2
+
T
max
(
k
)
-
T
min
(
k
+
1
)
2
cos
(
π
(
t
-
t
max
(
k
)
)
t
min
(
k
+
1
)
-
t
max
(
k
)
)
t
∈
[
t
max
(
k
)
,
t
min
(
k
+
1
)
)
where
T max (k) is a maximum temperature on day k,
T min (k) is a minimum temperature on day k,
t max (k) is a time of day for T max (k), and
t min (k) is a time of day for T min (k).Join the waitlist — get patent alerts
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