Run time criteria to control indoor blower speed
First Claim
1. A method of selectively varying a speed of an indoor blower of a heat pump in order to reduce cold blow effect of air entering the heat pump, the method comprising the steps of:
- determining primary and secondary run time fractions of primary and secondary heating cycles, respectively, where the primary heating cycle immediately preceeds the secondary heating cycle,the primary run time fraction being a function of heat pump operating on-time of the primary heating cycle and cycle-time of the primary heating cycle,the secondary run time fraction being a function of heat pump operating on-time of the secondary heating cycle and cycle-time of the secondary heating cycle,the primary and secondary heating cycles each being one complete respective cycle of the heat pump operating (on-time) and the heat pump not operating (off-time),cycle-time of each said respective cycle being the length of time of each complete said respective cycle (on-time plus off-time);
determining a run time fraction ratio that is a function of said primary and secondary run time fractions; and
controlling the speed of the indoor blower dependent on the primary run time fraction and the run time fraction ratio.
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Abstract
A method is described of selectively varying the speed of the indoor blower of a heat pump for heating a building or other indoor area when ambient temperature drops below a predetermined level, in order to reduce the cold blow effect of air entering the building. The operating run time fraction of a heating cycle is determined, and the speed of the indoor blower is adjusted when the run time fraction crosses a predetermined threshold value, except that the speed of the indoor blower is maintained when the run time fraction is sufficiently changed compared with a previous run time fraction.
8 Citations
20 Claims
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1. A method of selectively varying a speed of an indoor blower of a heat pump in order to reduce cold blow effect of air entering the heat pump, the method comprising the steps of:
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determining primary and secondary run time fractions of primary and secondary heating cycles, respectively, where the primary heating cycle immediately preceeds the secondary heating cycle, the primary run time fraction being a function of heat pump operating on-time of the primary heating cycle and cycle-time of the primary heating cycle, the secondary run time fraction being a function of heat pump operating on-time of the secondary heating cycle and cycle-time of the secondary heating cycle, the primary and secondary heating cycles each being one complete respective cycle of the heat pump operating (on-time) and the heat pump not operating (off-time), cycle-time of each said respective cycle being the length of time of each complete said respective cycle (on-time plus off-time); determining a run time fraction ratio that is a function of said primary and secondary run time fractions; and controlling the speed of the indoor blower dependent on the primary run time fraction and the run time fraction ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of selectively varying a speed of an indoor blower of a heat pump in order to reduce cold blow effect of air entering the heat pump, the method comprising the steps of:
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determining a run time fraction of a heating cycle, the run time fraction being a function of heat pump operating on-time and cycle-time of the heating cycle, the heating cycle being one complete respective cycle of the heat pump operating (on-time) and the heat pump not operating (off-time), cycle-time of the heating cycle being the length of time of the complete heating cycle (on-time plus off-time); and controlling the speed of the indoor blower dependent on the run time fraction of the heating cycle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification