KR20160118748A - Method for controlling defrost period by temperature difference of evaporator inlet/outlet and system using thereof - Google Patents

Method for controlling defrost period by temperature difference of evaporator inlet/outlet and system using thereof Download PDF

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Publication number
KR20160118748A
KR20160118748A KR1020150047343A KR20150047343A KR20160118748A KR 20160118748 A KR20160118748 A KR 20160118748A KR 1020150047343 A KR1020150047343 A KR 1020150047343A KR 20150047343 A KR20150047343 A KR 20150047343A KR 20160118748 A KR20160118748 A KR 20160118748A
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KR
South Korea
Prior art keywords
evaporator
temperature
outlet
inlet
defrost
Prior art date
Application number
KR1020150047343A
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Korean (ko)
Inventor
기호균
Original Assignee
유한회사 세계로냉동상사
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Priority to KR1020150047343A priority Critical patent/KR20160118748A/en
Publication of KR20160118748A publication Critical patent/KR20160118748A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Abstract

The present invention relates to a method for determining a defrosting period by a temperature difference between an inlet and an outlet of an evaporator and a defrosting system using the same which detect a temperature difference between an inlet and an outlet of an evaporator according to an amount of frost formed on an evaporator fin of a freezer or a refrigerator to determine an efficient defrosting period. According to the present invention, the defrosting system attaches a temperature sensor to a front end and a rear end of an evaporator to measure a temperature difference between an inlet and an outlet of the evaporator changing according to an amount of frost formed on an evaporator fin to drive a defrosting heater if the temperature difference is larger than or equal to a usual temperature deviation to remove the frost and block power to the defrosting heater when a prescribed time is completed. Therefore, the present invention can efficiently and stably defrost, save energy, and increase a service life of a heater bar.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting period determination method and a defrosting system using the same,

The present invention relates to a defrosting system for a freezer or a refrigerator, and more particularly, to a defrosting system for a freezer or a refrigerator, and more particularly, to a defrosting system for a freezer or a refrigerator which detects an effective defrosting cycle by detecting a temperature difference between an inlet and an outlet of an evaporator, And a defrosting system using the defrosting period determination method.

Generally, refrigerated or freezing warehouses are kept in a refrigerated or frozen state so that the food is not damaged. In order to maintain the quality of the stored food, the temperature should be kept low.

Refrigeration or freezing systems applied to such refrigeration or freezing warehouses require a relatively large space to be evenly refrigerated or frozen, and it is also required to keep the storage temperature evenly within a set temperature range.

In this refrigeration or refrigeration system, refrigerant is circulated in the piping by the compressor, and when the liquid refrigerant expands in the expansion valve and flows in the evaporator, air is passed between the evaporator pins by the fan, and the refrigerant vaporized by the heat exchange is sucked into the compressor The cold air is spread in the cold store or the cold store, and is chilled or frozen.

In this process, the moisture contained in the air passes between the evaporator pins, and the air is blocked by adhesion to the pipes and the pins, thereby preventing the refrigeration or freezing.

In order to solve this problem, defrosting operation is performed to remove the gaps attached to the evaporator pins.

The defrosting methods include a natural gas generating method in which the refrigerator is stopped for a certain period of time, a hot gas degassing method in which hot gas is introduced, an electric heater is installed in the evaporator, Various methods such as a thermal spraying method and a spraying method in which water is sprayed and removed are proposed.

A currently used defrosting method is a method of performing a defrosting operation by driving a heater built in an evaporator at a predetermined time regardless of whether or not it is attached to the casting by using a timer.

Generally, the defrosting system using the timer is operated for 20 to 30 minutes every 4 to 6 hours, regardless of whether or not it is attached to the castle.

However, the conventional defrosting method using the timer has the following problems.

It is very unreasonable to adjust the defrost heater driving time according to the number of times of opening or closing the door of the refrigerator or the freezer door, In short, if the electric energy lost when the heater is activated and the heat generated by the heater are further driven, the refrigerator must be further driven, so that not only a serious loss of electric energy occurs but also frequent heater operation shortens the life of the heater, You must give.

In order to compensate for the above problem, when the wind generated from the fan motor passes through the evaporator, the amount of wind passing between the pin and the pin decreases and the strength of the wind is reduced. There is a method of driving the defrosting system by detecting the presence or absence of defrosting.

However, the above-described conventional defrosting method using wind pressure is a method which is mainly applied to a household refrigerator and is not suitable for a refrigeration or freezing warehouse for storing industrial or food products or agricultural and marine products. To realize this, a prefabricated product such as an evaporator is disassembled, The system configuration to detect the wind pressure is complicated and the wind pressure may cause a malfunction due to a subtle change depending on the opening and closing of the warehouse door or the amount of contents in the warehouse.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a defrosting apparatus and a defrosting apparatus, A defrost cycle determination method using a temperature difference between an inlet and an outlet of the evaporator, and a defrost system using the defrost cycle determination method.

In order to achieve the above object, there is provided a method for determining a defrost cycle period by an evaporator inlet / outlet temperature difference according to the present invention comprises the steps of (1) providing a temperature sensor at an inlet and an outlet of an evaporator and detecting an inlet temperature and an outlet temperature of the evaporator; 2) comparing a difference between an inlet temperature and an outlet temperature of the detected evaporator with a predetermined temperature deviation, and determining a defrost cycle according to the comparison result.

At this time, when the temperature of the evaporator inlet / outlet detected becomes equal to or greater than a predetermined temperature deviation difference, it is recognized by the temperature controller and the defrost heater is operated for a predetermined time.

According to an aspect of the present invention, there is provided a defrost system for defrosting a freezer or a refrigerator, the defrost system comprising: a defrost heater; and a heater installed in the evaporator, the temperature being generated between an inlet and an outlet of the evaporator, And a controller for determining the defrost cycle according to the temperature difference measured by the sensor and driving the defrost heater in accordance with the determined defrost cycle.

In this case, the sensor is preferably a temperature sensor installed at the front end and the rear end of the evaporator and measuring the inlet temperature and the outlet temperature of the evaporator, respectively.

The temperature sensor installed at the inlet of the evaporator is attached at a position of 3 o'clock or 9 o'clock on the pipe sectional view, and the temperature sensor installed at the outlet of the evaporator is between 7 o'clock and 8 o'clock on the pipe sectional view, or between 4 o'clock and 5 o'clock In the direction of the arrow.

Preferably, the controller is a temperature controller that receives the sensing signal of the temperature sensor and drives the defrost heater when the deviation between the inlet temperature and the outlet temperature of the evaporator is equal to or greater than a preset temperature deviation.

The defrosting period determination method using the temperature difference of the evaporator inlet and outlet of the present invention and the defrosting system using the same have the following effects.

A temperature sensor is installed at the inlet and the outlet of the evaporator installed in the refrigerator or the freezer so that evaporation does not occur sufficiently in the evaporator when the frost is adhered to the pin of the evaporator and the suction pressure of the compressor is lowered and the evaporation temperature is further lowered, It is possible to efficiently and reliably defrost by determining that the temperature difference between the inlet and the outlet is increased and determining the defrost cycle at a proper time.

In other words, by determining the defrosting cycle by cold temperature, defrosting can be reduced by 20 ~ 30 minutes every 4 ~ 6 hours, and 19% energy saving effect can be expected.

Also, the temperature change in the refrigerator or the freezer due to the defrost heater is minimized, which will help maintain the freshness of the stored product.

In addition, since the defrosting time is shortened, the service life of the heater rod can be prolonged corresponding to the amount of energy saving, and at the same time, the expensive compressor due to defective defrosting can be prevented from being damaged by liquid compression.

1 is a perspective view showing a defrost system to which the present invention is applied,
2 is a side sectional view showing a state in which a temperature sensor is installed at the inlet and outlet of the evaporator,
3 (a) and 3 (b) are cross-sectional views of the piping for explaining the position of attachment of the temperature sensor at the inlet and outlet of the evaporator;

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, a defrost system (hereinafter referred to as a defrost system) using a defrost cycle determined by a temperature difference between an inlet and an outlet of an evaporator according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3 attached hereto.

The defrost system according to the present invention can prevent the temperature of the evaporator inlet 22 and the temperature of the outlet 23 from increasing due to insufficient evaporation of the evaporator pin 20 when the fins 20 in the evaporator 100 are generated. So that the defrost heater 21 is operated.

That is, the refrigerant compressed in the gas state in the compressor (not shown) is cooled and condensed in the liquid state in the condenser (outdoor unit) 30, and the liquefied refrigerant passes through the expansion valve 40 and expands, And the fan 10 rotates to pass air between the evaporator fins 20 to lower the temperature of the refrigerator and the evaporated refrigerant is sucked into the compressor again in the same condition as the refrigerant temperature immediately after the expansion valve 40. Therefore, the heat exchange with the air inside the refrigerator does not occur sufficiently in the state where the evaporator pin 20 is frozen, so that the suction pressure of the compressor is lowered and the evaporation temperature of the refrigerant is lowered so that the evaporator inlet 22 and the outlet 23, The temperature difference between the electrodes becomes larger.

At this time, when the temperature difference between the evaporator inlet 22, that is, the temperature immediately after the expansion valve 40 and the evaporator outlet 23, deviates from a normal range, defrosting is performed to determine a more efficient defrost cycle.

2, when the evaporator 100 is installed, the temperature sensors 50 and 60 are closely attached to predetermined positions of the evaporator inlet 22 and the outlet 23 so that the inlet temperature of the evaporator 100 and the outlet Measure the temperature.

At this time, the temperature sensors 50 and 60 are determined in consideration of the outer diameter of the inlet and outlet ports 22 and 23 of the evaporator 100, and the like.

3, in this embodiment, the temperature sensor 50 of the evaporator inlet 22 is installed at 3 o'clock or 9 o'clock on the pipe sectional view of (a), and the temperature sensor of the evaporator outlet 23 60 is preferably located in a position lower than the horizontal, that is, in a direction between 7 o'clock and 8 o'clock on the pipe sectional view of (b), or in a direction between 4 o'clock and 5 o'clock.

A sensitive heat tube 70 is attached to the pipe of the evaporator outlet 23 to adjust the opening of the expansion valve (TEV) 40 according to the state of the outlet refrigerant.

Referring to FIG. 2, the evaporator 100 vaporizes and evaporates the liquid refrigerant expanded through the expansion valve 40, and then flows it into a compressor (not shown).

At this time, a temperature difference between the temperature of the pin itself and air is generated in the evaporator pin 20 by performing heat exchange for absorbing heat from the introduced air. When the temperature of the evaporator pin 20 becomes lower than the apparatus dew point, the evaporator pin 20 is inspected. Not only does this performance serve as a heat resistor for obstructing heat transfer between the air and the refrigerant, but also the temperature difference between the temperature of the evaporator inlet 22 and the temperature of the outlet 23 increases due to insufficient heat exchange in the evaporator pin 20.

The temperature sensors 50 and 60 provided at the evaporator inlet 22 and the outlet 23 respectively measure the inlet temperature and the outlet temperature of the evaporator 100 and deliver the measured temperature to the temperature controller TC 80. That is, the thicker the temperature, the greater the temperature difference.

The temperature controller 80 is built in a controller (not shown). When the temperature difference measured by the temperature sensors 50, 60 is equal to or more than a predetermined temperature difference, the defrost heater 21 is activated to start the defrosting operation. The operation of the defrost heater 21 is stopped and the defrosting operation is terminated.

The present inventors have applied the above-described defrosting system to a freezer for storing mushrooms of 5 pyeong.

[Example 1]

In the construction of the freezer for storing 5 pyeong mushrooms, 100 ㎜ urethane panel was used as the wall. The cooler was installed in the PAS-050 (5HP) condensing unit manufactured by Kyungdong Industrial Co., Ltd., SDU-075L A unit cooler was installed. The unit cooler is a Finco solar evaporator. The two sensor car-heater FOX-815DT manufactured by Daesung ENG is installed as temperature sensor (50,60) to measure the inlet temperature and outlet temperature on the unit cooler side. The temperature sensors (50, 60) are interlocked with the defrosting magnet (80) to measure the temperature difference according to the amount of the defrosting, so that the defrosting system can operate when the temperature deviation is 5 degrees or more.

In order to measure the accurate power consumption, TWR-ALM3 manufactured by Seocheon Electric Communication Co., Ltd. was installed and defrosted at intervals of 30 minutes four times a day, and defrosting system of the present invention according to the temperature difference of the evaporator inlet / The results are shown in Table 1.

division Power Consumption efficiency(%) Conventional method (4 times per 30 minutes interval) 80 kW / hr 100 Determination of defrost cycle according to temperature difference of evaporator inlet and outlet 67 kW / hr 119

* Measurement conditions: The average value is calculated by operating for 10 days with the door closed five times a day, average outside temperature 30 ℃, and 1 ton of bokbun (ton).

As shown in Table 1 above, it can be seen that the defrost system according to the present invention is more efficient than the conventional defrosting method at constant time intervals regardless of the presence or absence of gender.

100: Evaporator 10: Fan motor
20: evaporator pin 21: defrost heater
22: Evaporator inlet 23: Evaporator outlet
30: condenser 40: expansion valve (TEV)
50, 60: a temperature sensor 70:
80: Temperature controller (TC)

Claims (6)

(1) providing a temperature sensor at an inlet and an outlet of an evaporator, and detecting an inlet temperature and an outlet temperature of the evaporator; And
(2) comparing the difference between the inlet temperature and the outlet temperature of the detected evaporator with a predetermined temperature deviation, and determining a defrost cycle according to the comparison result. The evaporator according to claim 1, wherein, in step (2), when the temperature of the evaporator inlet / outlet detected becomes equal to or greater than a predetermined temperature deviation difference, the temperature controller adjusts the defrost heater outlet / Determination Method of Defrosting Cycle by Temperature Difference. In a defrost system of a freezer or a refrigerator,
Defrost heater;
A sensor mounted on the evaporator and measuring a temperature difference generated between the inlet and the outlet of the evaporator according to the amount of the frost impregnated on the pin of the evaporator; And
And a controller that determines a defrost cycle in accordance with the temperature difference measured by the sensor and drives the defrost heater in accordance with the determined defrost cycle. The defrost system according to claim 3, wherein the sensor is a temperature sensor installed at a front end and a rear end of the evaporator and measuring an inlet temperature and an outlet temperature of the evaporator, respectively. 5. The method of claim 4, wherein the temperature sensor installed at the inlet of the evaporator is attached at a position of 3 o'clock or 9 o'clock on the pipe sectional view, and the temperature sensor installed at the outlet of the evaporator is between 7 o'clock and 8 o'clock or 4 o'clock And 5 o'clock. The defrost system using the evaporator inlet / outlet temperature difference. The evaporator according to claim 4, wherein the controller is a temperature controller for receiving the sensing signal of the temperature sensor and driving the defrost heater when the deviation between the inlet temperature and the outlet temperature of the evaporator is equal to or greater than a preset temperature deviation. Defrost system using temperature difference.
KR1020150047343A 2015-04-03 2015-04-03 Method for controlling defrost period by temperature difference of evaporator inlet/outlet and system using thereof KR20160118748A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190030967A (en) 2017-09-15 2019-03-25 박병남 Unit cooler with hotgas defrosting function and method of controlling the same
WO2019243561A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator by use of air temperature measurements
WO2019243106A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator
KR102109350B1 (en) 2020-02-27 2020-05-12 이복주 Automatic Defrost Detection System Using Cooling Temperature Time and Inlet Gas Pipe Temperature of Refrigerator and the operating method using it
CN112944753A (en) * 2019-12-11 2021-06-11 杭州三花研究院有限公司 Control system and control method thereof
KR102317538B1 (en) * 2021-05-17 2021-10-26 김흥식 A versatile defrosting device using near-infrared lamps capable of defrosting and dehumidifying
CN113790570A (en) * 2021-08-12 2021-12-14 珠海格力电器股份有限公司 Refrigerator defrosting control method and refrigerator
KR20220067940A (en) * 2020-11-18 2022-05-25 주식회사 제이오텍 Defrost control method using temperature sensor and defrost system implementing the same
US11365919B2 (en) 2018-07-06 2022-06-21 Danfoss A/S Apparatus for removing non-condensable gases from a refrigerant
CN114704994A (en) * 2018-03-08 2022-07-05 Lg电子株式会社 Refrigerator with a door

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190030967A (en) 2017-09-15 2019-03-25 박병남 Unit cooler with hotgas defrosting function and method of controlling the same
CN114704994A (en) * 2018-03-08 2022-07-05 Lg电子株式会社 Refrigerator with a door
CN114704994B (en) * 2018-03-08 2023-12-29 Lg电子株式会社 Refrigerator with a refrigerator body
CN112189120A (en) * 2018-06-22 2021-01-05 丹佛斯有限公司 Method for terminating defrosting of evaporator
EP3587962A1 (en) * 2018-06-22 2020-01-01 Danfoss A/S A method for terminating defrosting of an evaporator by use of air temperature measurements
EP3587964A1 (en) * 2018-06-22 2020-01-01 Danfoss A/S A method for terminating defrosting of an evaporator
CN112219075A (en) * 2018-06-22 2021-01-12 丹佛斯有限公司 Method for terminating evaporator defrost by using air temperature measurement
US20210033325A1 (en) * 2018-06-22 2021-02-04 Danfoss A/S A method for terminating defrosting of an evaporator
WO2019243106A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator
US11549734B2 (en) 2018-06-22 2023-01-10 Danfoss A/S Method for terminating defrosting of an evaporator by use of air temperature measurements
CN112189120B (en) * 2018-06-22 2022-03-04 丹佛斯有限公司 Method for terminating defrosting of evaporator
WO2019243561A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator by use of air temperature measurements
CN112219075B (en) * 2018-06-22 2022-05-31 丹佛斯有限公司 Method for terminating evaporator defrost by using air temperature measurement
US11365919B2 (en) 2018-07-06 2022-06-21 Danfoss A/S Apparatus for removing non-condensable gases from a refrigerant
CN112944753A (en) * 2019-12-11 2021-06-11 杭州三花研究院有限公司 Control system and control method thereof
KR102109350B1 (en) 2020-02-27 2020-05-12 이복주 Automatic Defrost Detection System Using Cooling Temperature Time and Inlet Gas Pipe Temperature of Refrigerator and the operating method using it
KR20220067940A (en) * 2020-11-18 2022-05-25 주식회사 제이오텍 Defrost control method using temperature sensor and defrost system implementing the same
KR102317538B1 (en) * 2021-05-17 2021-10-26 김흥식 A versatile defrosting device using near-infrared lamps capable of defrosting and dehumidifying
CN113790570B (en) * 2021-08-12 2022-11-25 珠海格力电器股份有限公司 Refrigerator defrosting control method and refrigerator
CN113790570A (en) * 2021-08-12 2021-12-14 珠海格力电器股份有限公司 Refrigerator defrosting control method and refrigerator

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