JPH0534034A - Absorption type freezer - Google Patents

Abstract

PURPOSE:To reduce power of a cooling water pump and further to reduce the pipe size or the cleaning tower capacity by a method wherein the cooling water is fed into a front-stage path of an absorbing device and after the cooling water is fed into a condensor, the cooling water is lastly fed into a rear stage path of the absorbing device. CONSTITUTION:A double functional absorption type freezer is comprised of an evaporator 1, an absorbing device 4, a condensor 7 as well as a low temperature regenerator, a high temperature regenerator, a heat exchanger, a solution pump and a refrigerant pump. In this case, a heat transfer pipe of the absorption device 4 is divided into three paths. Cooling water 5 is fed into the first path (lower-most stage) and the second path (middle stage) of the front stage of the absorption device 4 and after into the condensor 7, the cooling water is fed to the third path (upper-most stage) and fed out of a freezer. In turn, rich solution within the absorption device 4 is dispersed from above (the third path), fed down to the middle stage path and the lower- most stage path in sequence to cause itself to become lean solution, thereafter the lean solution is fed out at the bottom part of the absorption device. With such an arrangement, the power of the cooling water pump is reduced and at the same time a pipe size or a cooling water capacity is made low.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an absorption refrigerating machine using an aqueous solution of lithium bromide and water for general air conditioning and general industry.

[0002]

2. Description of the Related Art It is a generally adopted method to flow cooling water from an absorber to a condenser. As an application example, (1)
Run parallel to absorber and condenser. (2) Flow from condenser to absorber. There is an example that it was adopted for special conditions (special cooling water temperature, heat pump, etc.), but for normal air conditioning applications,
There is no example of devising a method of flowing cooling water.

[0003]

The cooling water used in the conventional double-effect absorption refrigerator is 32 ° C. at the inlet and 37.4 at the outlet.
C, the amount of water is usually about 1.6 to 1.8 times the amount of cold water,
On the other hand, the cooling water of the turbo chiller, which has been a mainstream product in the market in the past, has an inlet temperature of 32 ° C., an outlet temperature of 37 ° C., and an amount of water that is 1.2 to 1.25 times the normal amount of cold water.

Although the absorption refrigerator has a large amount of cooling heat and is limited in terms of cycle, this is good.
When the existing turbo refrigerator is replaced, if the same level of cooling water is realized, the replacement cost can be reduced or the replacement cannot be performed.

In the present invention, it was attempted to keep the conventional product cost at 32 ° C. at the cooling water inlet and 40 ° C. at the outlet so that the water amount was about 1.2 to 1.25 times the cold water amount.

[0006]

In the prior art, the cooling water temperature at the absorber is 32 ° C. at the inlet and about 36 ° C. at the outlet, and in the condenser, the inlet is about 36 ° C. and the outlet at about 37.4 ° C. The specifications are as follows: inlet 32 ℃, outlet 37.4 ℃,
If the inlet of the cooling water is kept unchanged at 32 ° C. and the outlet is set to 40 ° C. in order to simply reduce the amount of the cooling water by a predetermined amount, the condensing temperature rises, and the high temperature regenerator pressure of the cycle rises, which does not hold.

Therefore, for example, if the absorber is divided into a former stage (for example, 2/3 of the absorber electric heating tube) and a later report (remaining 1/3), first, cooling water is introduced to the former stage of the absorber, and the inlet is introduced. 32
℃, pre-stage outlet 36 ℃, then condenser inlet 36 ℃, outlet 38
℃ Finally, introduced into the latter stage of the absorber, inlet 38 ℃, outlet 40
Since the temperature conditions in the condenser are hardly changed when the temperature is set to ℃, if the inlet 38 ℃ and the outlet 40 ℃ can be processed in the latter stage of the absorber, then the specification of 32 ℃ -40 ℃ will be established.

On the other hand, in the absorber, 50
A concentrated solution (usually 62-64% concentration) of 35 ° C to 55 ° C absorbs the evaporated refrigerant and a dilute solution of 35 ° C to 40 ° C (usually 57 to 40%).
(59%), the sensible heat of the solution and the amount of heat generated by absorption are cooled.

Therefore, if the heat transfer tube of the absorber is divided into the front stage and the rear stage in this way, heat exchange between the front stage and the low temperature range of the solution in the absorber and the rear stage with the high temperature solution are performed. The purpose can be achieved by performing predetermined heat exchange without deteriorating the apparent average heat transfer coefficient in the absorber.

[0010]

According to the present invention, the cooling water of the absorption chiller is first put in the former stage pass of the absorber, then in the condenser, and finally again in the latter stage pass of the absorber, so that the cooling water pump power is reduced. The size of the piping and the capacity of the cooling tower can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The heat transfer tube of the absorber 4 is divided into three passes, and the cooling water 5 passes through the first pass (lowermost stage) and the second pass (middle stage) which are the preceding stages of the absorber, and then the condenser 7. And then again
It can be taken out of the plane through the third pass (uppermost stage) of the absorber.

A conventional method is shown in FIG. Cooling water 5
Passes through all the paths of the absorber 4, passes through the condenser 7, and exits the aircraft. Cold water is the same as in FIGS. 1 and 2.

On the other hand, in this embodiment, the concentrated solution in the absorber 5 is sprayed from the top (third pass), flows down to the middle and bottom paths, becomes a dilute solution, and flows out from the bottom. By effectively combining with this solution spraying method, if there is the required number of heat transfer tubes (in relation to the cooling water flow rate) in the conventional method, even if the temperature difference between the cooling water and the solution becomes small,
A predetermined heat exchange becomes possible (about 3 to 4 ° C. smaller).

Further, in both FIGS. 1 and 2, the solution flow in the absorber and the cooling water path arrangement are opposed to each other.
Compared with the case of the general example, in which the solution and cooling water in the absorber are not made to flow counter-currently, the effect of the present invention becomes greater, the amount of cooling water is reduced, and It is possible to reduce the number of heat transfer tubes.

[0015]

The effect of the present invention is 3 without increasing the heat transfer area of the conventional machine.
Satisfies the cooling water specifications of 2 to 40 ° C, and as a result, (1) Reduction of cooling water pump power.

(2) The cooling water pipe size is reduced.

(3) Miniaturization of the cooling tower.

Can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a relationship between a flow direction of cooling water and a path according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a prior art example.

[Explanation of Codes] 1 ... Evaporator, 2 ... Cold water inlet, 3 ... Cold water outlet, 4 ... Absorber, 5 ... Cooling water absorber inlet, 6 ... Cooling water absorption outlet, 7 ...
Condenser, 8 ... Cooling water condenser inlet, 9 ... Cooling water condenser outlet.

Claims (1)

Claim: What is claimed is: 1. A double-effect absorption refrigerator including an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a heat exchanger, a solution pump, and a refrigerant pump. Is first put in the front stage pass of the absorber, then put in the condenser, and finally put in the latter stage pass of the absorber again.