CN2222333Y

CN2222333Y - Air return heating device for hot pump wood drying machine

Info

Publication number: CN2222333Y
Application number: CN 95239772
Authority: CN
Inventors: 金苏敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-18
Filing date: 1995-05-18
Publication date: 1996-03-13
Anticipated expiration: 2005-05-18

Abstract

The utility model provides an air return heating device for heat pump wood dryers. The cold capacity in low temperature air is utilized for precooling the air before the air enters an evaporator. The dehumidifying ability of the heat pump dryer is increased. The air return heating device for heat pump wood dryers is composed of two groups of same finned tubes of an air precooler and an air preheater, wherein, the air precooler is arranged in front of the evaporator; the air preheater is arranged behind the evaporator; a plurality of rows of tubes of the air precooler are connected with a plurality of rows of tubes of the air preheater by ascending tubes and descending tubes to form a plurality of groups of tube banks, and a working medium of a low boiling point is charged inside the tubes.

Description

Air backheating device on the heat pump wood dryer

The utility model relates to heat transfer and removal moisture drying field, is the air backheating device on a kind of heat pump wood dryer specifically.

At present, the heat pump wood dryer has obtained application more and more widely at home and abroad, its operation principle is, the higher air of relative humidity is flowed through behind the evaporimeter of heat pump, the temperature of humid air reduces, separate out and deaeration in contained moisture content, then when air is flowed through condenser, air is again by heat pump, and air becomes the lower dry air of relative humidity.All temperature reduces now both at home and abroad all wood dryers behind the evaporimeter for air is flowed through, and Cryogenic air directly flows through the condenser heating then, and the cold that advances like this in the Cryogenic air of condenser does not fully utilize.

The purpose of this utility model then is the problem at above-mentioned existence, a kind of air backheating device that is applicable on the heat pump wood dryer is provided, it utilizes the cold in the Cryogenic air to come precooling to advance the preceding air of evaporimeter, and the dehumidifying effect of heat pump drier is increased greatly.

The utility model technical solution:

Air backheating device on a kind of heat pump wood dryer, before it is characterized in that air precooler is placed in evaporimeter, after air preheater is placed in evaporimeter, the plurality of rows pipe of air precooler is connected by tedge and down-comer respectively with the plurality of rows pipe of air preheater and forms some groups of pipe rows, air precooler, air preheat organ pipe have added fin, charge into low boiling working fluid in the pipe.

The utility model has following advantage compared to existing technology:

1, because the air precooler and the air preheat organ pipe outer air side of regenerator can be by coming enhanced heat exchange with fin, so the effectiveness of regenerator height of this regenerator;

2, this regenerator has been owing to all added fin in cold and hot both sides, thus this regenerator can be under the little temperature difference operate as normal;

3, the heat pump wood dryer can make moisture removal than increasing greatly originally after increasing this regenerator.In air themperature is 40 ℃, and relative humidity is 80% o'clock, and dehumidifying energy loss-rate is reduced to 0.311 degree electricity/removal, 1 kg of water, than original economize on electricity 24% by original 0.410 degree electricity/removal, 1 kg of water;

4, the action effect of this regenerator improves with the relative humidity reduction of air, and this is that relative humidity is more little because humid air is when thermal discharge is identical, and temperature drop is big more, and the regenerator effectiveness of regenerator is high more like this.This situation is to preventing that the drying of wood cracking from being favourable, timber drying (particularly hardwood material), bigger in dry initial stage humid air relative humidity, require rate of drying slow, and it is lower at the later stage of drying relative air humidity, require rate of drying fast, the effect of this regenerator conforms to therewith.

Fig. 1 is the utility model structural representation.

Below in conjunction with accompanying drawing the utility model is further described:

The utility model is made up of 3 liang of identical finned tube exchangers of group of air precooler 1 and air preheater.1～6 array of pipes of air precooler 1 is connected by tedge 4 and down-comer 5 respectively with 1～6 array of pipes of air preheater 3 and forms 1～6 group of pipe row, charges in the pipe as low boiling working fluids such as acetone, fluorine Lyons, ammonia, absolute ethyl alcohols.The hot humid air air precooler 1 of at first flowing through, air heat air precooler 1, the heat transferred intraductal working medium, evaporation flowed into air preheater 3 through tedge 4 after working medium absorbed heat, hot humid air continues cooling through evaporimeter 2 again and becomes Cryogenic air after air precooler 1 cooling, Cryogenic air flow through again go after the low boiling working fluid heating that air preheater 3 flowed into by tedge 4 condenser further heating become heated drying air, while low boiling working fluid in air preheater 3 itself is condensed into liquid and flow back in the air precooler 1 through down-comer 5, working medium constantly circulates, and just finishes the heat recovery process of air.

Claims

1, the air backheating device on a kind of heat pump wood dryer, before it is characterized in that air precooler is placed in evaporimeter, after air preheater is placed in evaporimeter, the plurality of rows pipe of air precooler is connected by tedge and down-comer respectively with the plurality of rows pipe of air preheater and forms some groups of pipe rows, air precooler, air preheat organ pipe have added fin, charge into low boiling working fluid in the pipe.

2, the air backheating device on the heat pump wood dryer according to claim 1,1～6 array of pipes that it is characterized in that air precooler are connected by tedge and down-comer respectively with 1～6 array of pipes of air preheater and form 1～6 group of pipe row.

3, asked air backheating device on the heat pump wood dryer of 1 brief biography of a deceased person according to right, be it is characterized in that low boiling working fluid is acetone, fluorine Lyons, ammonia, absolute ethyl alcohol.