Technique for fan cycling to maintain temperature within prescribed limits
First Claim
1. Method for maintaining the temperature of a served zone within prescribed limits with HVAC equipment of the type includng a supply fan which provides air into a set of cooling/heating coils or an air washer wherein a prescribed balance temperature is set;
- the fan is operated in cycles of predetermined time span in which the fan is run part of the time and idle part of the time;
the actual temperature in said served zone is sensed for a current cycle and delivered to a data processing unit; and
the fan run time in each succeeding cycle during which said fan is operated is selectively controlled by said data processing unit in direct proportion to the difference between said actual temperature in the served zone for said current cycle and said prescribed balance temperature.
0 Assignments
0 Petitions
Accused Products
Abstract
The temperature of a serviced area or zone is cost efficiently maintained within a prescribed range by establishing a prescribed fan cycle period, during which period the fan is both operative and non-operative at variable intervals. The temperature of the serviced area is monitored and averaged for each given cycle. The fan run time is then determined by a CPU for the succeeding cycle dependent upon the difference between the average measured temperature and a prescribed balance temperature.
-
Citations
8 Claims
-
1. Method for maintaining the temperature of a served zone within prescribed limits with HVAC equipment of the type includng a supply fan which provides air into a set of cooling/heating coils or an air washer wherein a prescribed balance temperature is set;
- the fan is operated in cycles of predetermined time span in which the fan is run part of the time and idle part of the time;
the actual temperature in said served zone is sensed for a current cycle and delivered to a data processing unit; and
the fan run time in each succeeding cycle during which said fan is operated is selectively controlled by said data processing unit in direct proportion to the difference between said actual temperature in the served zone for said current cycle and said prescribed balance temperature. - View Dependent Claims (2, 3, 4, 6, 7)
- the fan is operated in cycles of predetermined time span in which the fan is run part of the time and idle part of the time;
-
5. Method for maintaining the temperature of a serviced zone within prescribed limits with HVAC equipment of the type including an air supply fan which provides a controlled, variable air input to a set of cooling/heating coils or to an air washer comprising the steps of:
-
(a) setting prescribed cycle periods within which periods said fan is operative and inoperative, said cycle periods having a minimum fan run time to maintain fresh air within said serviced zone; (b) setting a prescribed limit temperature and a balance temperature for a served by the HVAC system; (c) measuring the average temperature in said zone during a prescribed current cycle to determine an actual temperature for said current cycle; (d) comparing said actual temperature in said current cycle with said balance temperature; and
, automatically adjusting by a computer the amount of time during the succeeding cycle that said fan is operative responsive in direct proportion to the difference between said actual temperature for said current cycle and said prescribed balance temperture. - View Dependent Claims (8)
-
Specification