CN108266863B - Defrosting waste heat absorption and reuse control method - Google Patents

Defrosting waste heat absorption and reuse control method Download PDF

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Publication number
CN108266863B
CN108266863B CN201711480671.2A CN201711480671A CN108266863B CN 108266863 B CN108266863 B CN 108266863B CN 201711480671 A CN201711480671 A CN 201711480671A CN 108266863 B CN108266863 B CN 108266863B
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temperature
defrosting
heat
air conditioning
conditioning system
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CN108266863A (en
Inventor
杨杰
林祥明
赖长明
施永康
孙军
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Guangdong Gaoermei Refrigeration Equipment Co ltd
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Guangdong Gaoermei Refrigeration Equipment Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • F25B47/022Defrosting cycles hot gas defrosting
    • F25B47/025Defrosting cycles hot gas defrosting by reversing the cycle

Abstract

The invention discloses a control method for absorbing and recycling defrosting waste heat, after an air-conditioning system is defrosted, the control system controls the air-conditioning system to carry out heat recovery treatment on the defrosting waste heat by detecting coil temperature Tb and ambient temperature Tr, compared with the prior art, in the control method, after the defrosting of the air-conditioning heat pump system is finished, a refrigerating system firstly absorbs the heat of a heat source side heat exchanger and then starts a fan, so that the defrosting waste heat of the heat source side heat exchanger is prevented from being absorbed and wasted by low-temperature air; the control method not only reduces the heat loss of the air-conditioning heat pump system in the defrosting process of the heat source side heat exchanger, but also controls the starting and stopping of the fan through the coil temperature, the ambient temperature and the threshold value temperature delta t to ensure that the system is heated and operated at a higher ambient temperature, thereby reducing the defrosting energy loss and improving the energy efficiency ratio.

Description

Defrosting waste heat absorption and reuse control method
Technical Field
The invention relates to the technical field of air-conditioning heat pump systems, in particular to a defrosting waste heat absorption and reuse control method.
Background
The heat exchanger at the heat source side of the existing air-conditioning heat pump system is easy to frost at low environmental temperature, and the heat exchange effect and the heating capacity of a unit are influenced. In order to ensure the normal operation of a unit, the prior art carries out defrosting on a heat source side heat exchanger by detecting the temperature of a coil of the heat source side heat exchanger, when the heat source side heat exchanger frosts to a certain degree, the temperature of the coil is lower and lower, when the temperature of the coil is reduced to a set value, a refrigerating system closes a fan, and a reversing valve reverses to defrost the heat source side heat exchanger; when the temperature of the coil pipe rises to a set value, the fan is started by the refrigerating system, and the reversing valve reverses to heat.
When the defrosting of the heat source side heat exchanger is finished in the existing defrosting technology, the heat source side heat exchanger absorbs partial heat in the defrosting process to raise the temperature of the heat source side heat exchanger to defrost, the temperature of the heat source side heat exchanger is higher than that of the environment, if the system starts a fan to perform heating operation at the moment, the heat on the heat exchanger is absorbed and taken away by low-temperature air, a large amount of heat loss is caused, and the energy efficiency ratio of the air-conditioning heat pump unit is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a defrosting waste heat absorption and reuse control method;
in order to achieve the purpose, according to the control method for absorbing and recycling defrosting waste heat provided by the invention, after the air conditioning system is defrosted, the control system controls the air conditioning system to carry out heat recovery treatment on the defrosting waste heat by detecting the coil temperature Tb and the ambient temperature Tr.
Further, the method comprises the following steps:
s10, the air conditioning system is in a heating operation state;
s20, the control system detects that the ambient temperature Tr and the coil temperature Tb meet the defrosting condition requirements, the air conditioning system enters a defrosting mode and starts to defrost a heat exchanger at a heat source end until defrosting is finished;
s30, when the air conditioning system is switched to a heating operation mode after defrosting is finished, the control system controls the fan to be started or closed by comparing the relationship between the coil temperature Tb and a preset temperature value Tbs;
s40, after the air conditioning system enters heating operation, the control system detects the relationship between the coil temperature Tb and the ambient temperature Tr and the threshold temperature delta t so as to control the fan to be turned on or turned off;
and S50, when the temperature Tb of the coil pipe is less than or equal to the sum of the ambient temperature Tr and the threshold temperature delta t, starting the fan to operate.
Further, in step S20, when the air conditioning system meets the defrosting condition, defrosting is performed, and the fan is turned off during defrosting; in step S30, when the coil temperature Tb is less than the preset temperature Tbs, the fan is started, and the air conditioning system absorbs the heat of air through the heat source end heat exchanger to perform heating operation; in step S40, when the coil temperature Tb is greater than the sum of the ambient temperature Tr and the threshold temperature Δ t, the fan is kept off, and the air conditioning system absorbs the heat retained by the heat source end heat exchanger to perform heating operation; in step S40, the threshold temperature Δ t is adjusted according to the specification of the air conditioning system to adapt to the air conditioning system to keep operating efficiently under normal heating conditions.
The invention adopts the scheme, and has the beneficial effects that: 1) and (3) reducing defrosting heat loss: compared with the prior art, the control method has the advantages that after defrosting of the air-conditioning heat pump system is finished, the refrigerating system firstly absorbs heat of the heat exchanger on the heat source side and then starts the fan, so that waste of defrosting waste heat of the heat exchanger on the heat source side is prevented from being absorbed by low-temperature air; 2) the energy efficiency ratio is improved: compared with the prior art, the control method not only reduces the heat loss of the air-conditioning heat pump system in the defrosting process of the heat source side heat exchanger, but also controls the starting and stopping of the fan through the coil temperature, the ambient temperature and the threshold temperature delta t to ensure that the system is heated and operated at a higher ambient temperature, thereby reducing the defrosting energy loss and improving the energy efficiency ratio.
Drawings
FIG. 1 is a logic diagram of a defrosting waste heat absorption control method of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1, in the control method for absorbing and recycling defrosting waste heat according to the embodiment, after the air conditioning system defrosts, the control system controls the air conditioning system to perform heat recovery processing on defrosting waste heat by detecting the coil temperature Tb and the ambient temperature Tr.
In the embodiment, the defrosting waste heat absorption and reuse control method is implemented in a low-temperature heat pump system: the existing low-temperature air source heat pump system runs at a low ambient temperature, a heat source end heat exchanger is easy to frost, and the heating capacity and the energy efficiency ratio of a unit are affected.
When the air conditioning system meets the defrosting exit condition, the air conditioning system stops defrosting, and the reversing valve reverses to heat the using end; however, when the air conditioning system directly starts the fan to heat the user end after defrosting is finished, the defrosting waste heat of the heat source end heat exchanger is taken away by low-temperature air, and heat loss is caused.
When Tb is less than Tbs, that is, the coil temperature Tb is less than the preset temperature Tbs, it indicates that the temperature of the heat source end heat exchanger is lower than the set temperature Tbs, and the defrosting residual heat is less, then the air conditioning system can start the fan during heating operation, and the heat source end heat exchanger absorbs the air heat for heating.
When Tb is larger than or equal to Tbs, namely the temperature of the coil is larger than or equal to the preset temperature value Tbs, the temperature of the heat source end heat exchanger is higher, the heat exchange end heat exchanger still retains waste heat after defrosting is finished, the air conditioner can firstly absorb the heat retained by the heat source end heat exchanger for heating, and the phenomenon that the fan absorbs the part of the waste heat to discharge the waste heat to the outside to cause heat loss is avoided. Therefore, when Tb is larger than or equal to Tbs, the air conditioning system absorbs heat of the heat source side heat exchanger to perform heating operation when the fan is in a closed state.
When the fan is in a closed state, the heat source end heat exchanger is absorbed to perform heating operation, the temperature of the heat source end heat exchanger is lower and lower, when the temperature of a coil pipe of the heat source end heat exchanger is reduced to a certain value, the fan needs to be started, the air conditioning system absorbs air heat to perform heating, and efficient heating operation of the refrigeration system is ensured. Therefore, when the air conditioning system performs heating operation in the fan-off state, the control system starts to detect the coil temperature Tb and the ambient temperature Tr.
When Tb is larger than Tr plus delta t, namely the temperature Tb of the coil is larger than the ambient temperature Tr plus the preset threshold temperature delta t, the temperature of the heat source side heat exchanger is higher than the ambient temperature, so that the cooling system keeps the fan closed, and the cooling system performs heating operation.
When b is less than or equal to Tr plus Deltat, namely the coil temperature Tb is less than the ambient temperature Tr plus a preset threshold temperature Deltat, the temperature of the heat source side heat exchanger is similar to the ambient temperature, and the refrigerating system starts a fan, so that the heat of air is absorbed by the heat source side heat exchanger to keep the high-efficiency heating operation of the refrigerating system.
Therefore, when Tb is less than or equal to Tr plus delta t, the refrigerating system starts the fan to perform heating operation.
In the operation process of the air conditioner, each temperature monitoring point has certain hysteresis, namely the actual temperature of the air conditioning system is possibly higher or lower than the detected actual temperature, and the actual temperature probe is fed back to the control system after heat transfer through a copper pipe, therefore, in order to prevent the temperature of the heat exchanger in the process of absorbing the defrosting waste heat of the air conditioning system from being lower than the ambient temperature, the air conditioning system is not started, the control system can be adjusted to be larger or smaller according to different refrigeration systems by adding a value temperature delta t, namely, when the air conditioning system absorbs the defrosting waste heat to perform heating operation, the coil temperature Tb is slightly larger than the actual ambient temperature Tr when the fan is started and stopped after the temperature of the fan is increased by a threshold temperature delta t, so that the refrigeration system can timely absorb higher heat source heat to perform heating operation.
By the control method, the defrosting waste heat absorption and reutilization function of the low-temperature air source heat pump system is controlled through the coil temperature Tb, the coil temperature Tbs set by the system, the ambient temperature Tr and the threshold temperature delta t.
Further, after defrosting is finished, when Tb is larger than or equal to Tbs, the air conditioning system heats and then starts the fan.
Further, after defrosting is finished, when Tb is less than Tbs, the air conditioning system starts the fan to perform heating operation.
Further, after the air conditioning system closes the fan heating operation, when Tb is larger than Tr plus delta t, the unit continues to close the fan heating operation.
Further, after the air conditioning system closes the fan to perform heating operation, when Tb is less than or equal to Tr plus delta t, the unit starts the fan to perform heating operation.
A defrosting waste heat absorption and reuse control method comprises the following steps:
s10, the air conditioning system is in a heating operation state;
s20, the control system detects that the ambient temperature Tr and the coil temperature Tb meet the defrosting condition requirements, the air conditioning system enters a defrosting mode and starts to defrost a heat exchanger at a heat source end until defrosting is finished;
s30, when the air conditioning system is switched to a heating operation mode after defrosting is finished, the control system controls the fan to be started or closed by comparing the relationship between the coil temperature Tb and a preset temperature value Tbs;
s40, after the air conditioning system enters heating operation, the control system detects the relationship between the coil temperature Tb and the ambient temperature Tr and the threshold temperature delta t so as to control the fan to be turned on or turned off;
s50, when the temperature Tb of the coil is less than or equal to the sum of the ambient temperature Tr and the threshold temperature Deltat (Tb is less than or equal to Tr plus Deltat), the fan is started to operate.
Further, in step S20, when the air conditioning system meets the defrosting condition, defrosting is performed, and the fan is turned off during defrosting.
Further, in step S30, when the coil temperature Tb is less than the preset temperature Tbs (i.e., Tb < Tbs), the fan is started, and the air conditioning system absorbs the heat of the air through the heat source end heat exchanger to perform the heating operation.
Further, in step S40, when the coil temperature Tb is greater than the sum of the ambient temperature Tr and the threshold temperature Δ t (i.e., Tb > Tr + Δt), the fan is kept off, and the air conditioning system absorbs the heat retained by the heat source side heat exchanger to perform a heating operation.
Further, in step S40, the threshold temperature Δ t is adjusted according to the specification of the air conditioning system to adapt to the air conditioning system to keep operating efficiently under normal heating conditions.
The air conditioning system controls the starting and stopping of the fan and the heating operation of the air conditioning system through the temperature of the coil pipe, so that the heat which is reserved on the heat source side in the defrosting process of the unit is absorbed and reused, and the heat is prevented from being absorbed and taken away by low-temperature air to cause heat loss; in the heating operation process of the air-conditioning system by absorbing the defrosting waste heat, the control system controls the temperature of the coil, the ambient temperature and the threshold value temperature delta t to ensure that the air-conditioning system can efficiently absorb the defrosting waste heat at a reasonable coil temperature; in the process of absorbing the defrosting waste heat by the air conditioning system, the starting and stopping temperature of the fan is limited by the environment temperature and the threshold temperature delta t, and the threshold temperature delta t is set as an adjustable temperature value, so that the heating operation of the system for absorbing the defrosting waste heat by the air conditioning system with different heating capacities can be effectively controlled by the control method.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent variations made according to the idea of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical solution of the present invention.

Claims (1)

1. A defrosting waste heat absorption and reuse control method is characterized by comprising the following steps: after the air conditioning system defrosts, the control system controls the air conditioning system to carry out heat recovery treatment on defrosting waste heat by detecting the temperature Tb of the coil and the ambient temperature Tr; the method comprises the following steps:
s10, the air conditioning system is in a heating operation state;
s20, the control system detects that the ambient temperature Tr and the coil temperature Tb meet the defrosting condition requirements, the air conditioning system enters a defrosting mode and starts to defrost a heat exchanger at a heat source end until defrosting is finished;
s30, when the air conditioning system is switched to a heating operation mode after defrosting is finished, the control system controls the fan to be started or closed by comparing the relationship between the coil temperature Tb and a preset temperature value Tbs;
s40, after the air conditioning system enters heating operation, the control system detects the relationship between the coil temperature Tb and the ambient temperature Tr and the threshold temperature delta t so as to control the fan to be turned on or turned off;
s50, when the temperature Tb of the coil pipe is less than or equal to the sum of the ambient temperature Tr and the threshold temperature delta t, starting a fan to operate;
in step S20, when the air conditioning system meets the defrosting condition, defrosting is performed, and the fan is turned off during defrosting;
in step S30, when the coil temperature Tb is less than the preset temperature Tbs, the fan is started, and the air conditioning system absorbs the heat of air through the heat source end heat exchanger to perform heating operation;
in step S40, when the coil temperature Tb is greater than the sum of the ambient temperature Tr and the threshold temperature Δ t, the fan is kept off, and the air conditioning system absorbs the heat retained by the heat source end heat exchanger to perform heating operation;
in step S40, the threshold temperature Δ t is adjusted according to the specification of the air conditioning system to adapt to the air conditioning system to keep operating efficiently under normal heating conditions.
CN201711480671.2A 2017-12-29 2017-12-29 Defrosting waste heat absorption and reuse control method Active CN108266863B (en)

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