JPH0395344A - Air conditioner - Google Patents

Abstract

PURPOSE:To diminish the growth of frost and allow high temperature air to blow out during operation at a low outside temperature by a method wherein the rotation speed of an outdoor fan is increased during heating operation only when the outside temperature is below a certain reference temperature. CONSTITUTION:When a heating operation instruction is issued by a remote controller or forced operation, an air conditioner begins to operate. At the same time, the outside temperature T1 is detected by an outside temperature detector 5, and compared by a comparator 7 with the reference outside temperature Ta set by an outside temperature setting device 6 to judge the outside temperature. When this judgment shows that the outside temperature is below the reference outside temperature, the rotating speed of an outside fan 10 is increased by an outside fan change-over device 8 and an output device 9. Then, the outside temperature is detected again to judge the outside temperature. After that, those actions above are repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to operational control of an air conditioner during normal heating operation and during heating low temperature.

Conventional technologyConventional air conditioners have the same outdoor fan speed during heating operation and during heating low temperature operation (from one defrosting operation to the next defrosting operation) [hereinafter referred to as low temperature operation].Control details Are you being controlled by? Q. What is the problem that the invention aims to solve? With conventional control, the outdoor fan speed control during heating operation and low temperature operation is the same, but a difference occurs in the outdoor heat exchanger capacity during both operations, which causes problems like during low temperature operation. As the load increases, the outdoor heat exchanger frosts up faster, and the heating capacity of the air conditioner cannot cope with the load.For example, the unit is the change in capacity for one cycle from the start of low-temperature operation to the end of defrosting operation. Expressed in terms of time (hereinafter referred to as integrated capacity), there is a tendency for this capacity (hereinafter referred to as integrated capacity) to decrease significantly during low-temperature heating operation. The purpose is to perform load-based control only when the temperature is below the specified temperature.

Means for Solving the Problems In order to solve the above problems, the present invention (1) changes the outdoor fan speed control during heating operation only when the outside air temperature is below a certain specified temperature.

Effect: The present invention increases the speed of the outdoor fan during heating operation only when the outside air temperature is below a certain specified temperature.
This reduces the length of frost formation and enables high-temperature air to be blown out during low-temperature operation, which in turn makes it possible to improve the integration capacity during low-temperature operation.

EXAMPLE Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, the first embodiment of the present invention will be described with reference to FIG. When a heating operation instruction is issued by a remote control or forced operation (step 1), the air conditioner starts operating (step 2).

At the same time, the comparing means 7 compares the outside air temperature T1 sampled by the outside air temperature detecting means 5 with the specified outside air temperature T1 determined by the outside air temperature setting means 6 (step 3), thereby determining the outside air temperature. As a result of this determination, if the outside air temperature is lower than the specified outside air temperature, the outdoor fan speed (rotation speed) is increased by the outdoor fan switching means 8, output means 9, and outdoor fan 10 (step 4). After that, the outside air temperature is sampled again and the outside air temperature is determined. Repeat this operation thereafter.

Effects of the Invention Based on the above-described content, the present invention (.) By increasing the outdoor fan speed depending on the outside air temperature, the frost formation on the outdoor heat exchanger is suppressed, and the cumulative heating capacity at low outside temperatures is improved. I can do it.

[Brief explanation of drawings]

FIG. 1 is a control flowchart showing an embodiment of the invention, and FIG. 2 is a control block diagram showing an embodiment of the invention.

Claims (1)

[Claims] temperature detection means for detecting and outputting outside air temperature; comparison means for comparing this outside air temperature and a temperature setting value and outputting a control signal; outdoor fan speed detection means for detecting and outputting outdoor fan speed; An air conditioner equipped with a comparison means that compares an indoor fan speed with a specified indoor fan speed and outputs a control signal.