Apparatus and method for preventing an evaporating for an air conditioning system form freezing
First Claim
1. An apparatus for preventing an evaporator of an air conditioner from freezing, the apparatus comprising:
- a fan disposed at a front of a condenser for blowing an air toward the condenser;
a first temperature sensor which detects an outdoor temperature and generates a first signal;
a second temperature sensor which detects a surface temperature of the condenser and generates a second signal;
a control section which receives the first and second signals from the first and second temperature sensors and generates a control signal based on the first and second signals for varying an R.P.M. of a motor assembly, the motor assembly connected to the fan for rotating the fan; and
an inverter which receives the control signal from the control section and modulates a frequency supplied thereto from a power source based on the control signal, thereby applying a modulated frequency to the motor assembly, wherein the control section generates a first control signal for rotating the fan at a high speed when the outdoor temperature is higher than a first predetermined temperature, a second control signal for rotating the fan at a middle speed when the outdoor temperature is lower than or equal to the first predetermined temperature, and a third control signal for rotating the fan at a low speed when the surface temperature of the condenser is lower than a second predetermined temperature, thereby constantly maintaining an internal pressure of the condenser.
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Accused Products
Abstract
A method for preventing an evaporator of an air conditioner from freezing comprises the steps of (1) detecting an outdoor temperature, (2) determining whether or not the outdoor temperature is 20° C., (3) determining whether or not the outdoor temperature is in a first temperature range, (4) determining whether or not the outdoor temperature is in a second temperature range, (5) varying an R.P.M. of the motor assembly based on the outdoor temperature detected in steps (3) and (4), (6) detecting a surface temperature of a condenser and determining whether or not the surface temperature of the condenser is in a third temperature range, (7) repeating steps (1) through (6) if the surface temperature of the condenser is higher than the third temperature range, and (8) rotating the motor assembly at a low speed if the surface temperature of the condensor is lower than the third temperature range. The apparatus is the advantageous in that the apparatus constantly maintains the internal pressure of the evaporator by varing the R.P.M. of the motor assembly according to the outdoor temperature and surface temperature of the condenser so that the internal pressure of the evaporator is constantly maintained, thereby preventing the evaporator of the air-conditioning system from freezing.
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Citations
13 Claims
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1. An apparatus for preventing an evaporator of an air conditioner from freezing, the apparatus comprising:
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a fan disposed at a front of a condenser for blowing an air toward the condenser; a first temperature sensor which detects an outdoor temperature and generates a first signal; a second temperature sensor which detects a surface temperature of the condenser and generates a second signal; a control section which receives the first and second signals from the first and second temperature sensors and generates a control signal based on the first and second signals for varying an R.P.M. of a motor assembly, the motor assembly connected to the fan for rotating the fan; and an inverter which receives the control signal from the control section and modulates a frequency supplied thereto from a power source based on the control signal, thereby applying a modulated frequency to the motor assembly, wherein the control section generates a first control signal for rotating the fan at a high speed when the outdoor temperature is higher than a first predetermined temperature, a second control signal for rotating the fan at a middle speed when the outdoor temperature is lower than or equal to the first predetermined temperature, and a third control signal for rotating the fan at a low speed when the surface temperature of the condenser is lower than a second predetermined temperature, thereby constantly maintaining an internal pressure of the condenser. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for preventing an evaporator of an air conditioner from freezing, the method comprising the steps of:
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(1) detecting an outdoor temperature by a first temperature sensor while driving a motor assembly at a normal speed; (2) determining whether or not the outdoor temperature is a first predetermined temperature; (3) determining whether or not the outdoor temperature is in a first temperature range if the outdoor temperature detected in step (2) is higher than the first predetermined temperature; (4) determining whether or not the outdoor temperature is in a second temperature range if the outdoor temperature detected in step (2) is the first predetermined temperature or lower than the first predetermined temperature; (5) varying in R.P.M. of the motor assembly based on the outdoor temperature detected in steps (3) and (4); (6) detecting a surface temperature of a condenser and comparing it with a second predetermined temperature; (7) repeating steps (1) through (6) if the surface temperature of the condenser is higher than or equal to the second predetermined temperature; and (8) rotating the motor assembly at a low speed if the surface temperature of the condenser is lower than the second predetermined temperature. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification