JPS59217452A - Heat collector utilizing solar heat - Google Patents

Abstract

PURPOSE:To increase the heat collecting amount of air per unit sunshine heat receiving area by a method wherein a heat collecting unit is constituted so as to be a fin tube type in which heat collecting fins are laminated in the axial direction of heat collecting tubes with specified spaces and the space between the heat collecting tubes is specified to a specified value. CONSTITUTION:The device is provided with a refrigerant enclosing circuit, in which a compressor 1, a condenser 2, an expansion valve 3 and the heat collecting unit 4 collecting the heats of the sun and air are connected sequentially, and a hot-water supplying circuit, in which a water heater 5 having the condenser 2 and a heat exchanging means, a hot-water reserving tank 6 and a water circulating pump 7 are connected, while the heat collecting unit 4 is constituted so as to be the fin tube type, in which the heat collecting fins 4b are laminated in the axial direction of the heat collecting pipes 4a with spaces of 4-6mm. and the spaces between the heat collecting pipes 4a are determined so as to be 40-60mm.. As a result, the heat collecting amount of air per unit sunshine heat receiving area is increased, the heat collecting unit is miniaturized and a space for mounting the unit is reduced. The heat absorbing amount of air and the efficiency of heat collecting operation become maximum when no wind is blowing at outside of a house.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat collecting device that uses a fluorocarbon-based refrigerant as a working medium and uses its latent heat to collect solar heat and air heat.

Conventional Structures and Problems There are two types of heat collectors that collect solar heat: forced circulation types that use water as a working medium, and natural circulation types. However, since both utilize the sensible heat of water, as the heat collection time elapses, the water flowing into the collector becomes hotter and the heat collection efficiency decreases. Therefore, even if the amount of solar radiation is sufficiently large, the amount of heat collected will be small. In addition, in order to improve the heat collection efficiency, the weight and cost of the heat collector are considered important, as are measures taken to equip the heat collector with glass, heat insulating materials, etc. Also, of course, there is the problem that heat cannot be collected when the amount of solar radiation is low.

Another heat collecting device is a refrigeration cycle using a fluorocarbon refrigerant as a working medium and sequentially connecting a compressor 1, a condenser 2, an expansion valve 3, and a heat collector 4 as shown in FIG. 5. A water heater having a heat exchange relationship with the condenser 2. Hot water tank6. There is a device consisting of a hot water supply circuit connected to a water circulation pump 7. In this case, the heat collector 4 can collect not only solar radiation but also atmospheric heat due to low-temperature heat collection, increasing the amount of heat collection.

In addition, the heat collector does not require glass, heat insulating materials, etc., making it possible to make it lighter and smaller. However, the heat collecting pipe 4 shown in FIG.
The flat plate type heat collector 4 is made by joining the heat collecting fins 4b and 4b.
Since the air ψ11 heat transfer coefficient is low, and the heat transfer area on the air side is not used effectively, the solar 1-1 radiation/reception%'Vj+'
! , because the amount of air heat absorbed per unit area is small, the collection ρ
, the equipment becomes larger, the installation space and equipment costs increase, and the amount of refrigerant sealed in the system increases. However, since the amount of refrigerant sealed is limited due to the reliability of the system equipment, the size of the heat collector is restricted. Therefore,
There is a problem with not being able to secure a sufficient amount of heat collection.

Purpose of the Invention The present invention fqi: Solve the problems listed in item 1, such as insufficient heat collection amount, increase in the size of the heat collector, installation space, increase in equipment cost, etc., and the reliability of equipment, and improve heat collection operation efficiency.-4 This is for the purpose of two things.

Structure of the Invention In order to achieve the above objects, a refrigeration cycle is constructed by sequentially connecting 11' (-compressor, condenser, expansion) F1 heaters.
, one heat problem configuration: 4 to 4 heat collecting fins in the axial direction of the heat collecting pipe.
By using a fin tube type in which XJ':L is overlapped at 6 mm intervals and the interval between the heat collecting pipes is constant at 40 to 60 holes, the amount of air heat collected per unit area of receiving solar radiation increases, and the heat collector It is smaller and requires less installation space.

In addition, by setting the heat collection fin spacing to 4 to 6 times, the amount of heat absorbed by the air is maximized when there is no wind outdoors (<C), and the heat collection operation efficiency is optimized.

Also, the interval between heat collecting pipes should be 40 to 60 mm (/
From rc, the heat collection operation efficiency is optimized from both aspects of fin efficiency, heat collection performance due to refrigerant side pressure loss, and equipment reliability due to the amount of refrigerant sealed.

Description of examples An embodiment of the heat collecting device of the present invention will be described with reference to FIG.

In FIG. 2, solid lines indicate the direction of coolant flow, and broken lines indicate the direction of water flow. 1 is a compressor, and 2 is a condenser, which performs the mixing action of refrigerant. 3 is an expansion valve, and 4 is a heat collector. As shown in FIG. It has a fin-tube type structure with intervals of 5p-4 to 60, and collects solar heat and air heat to evaporate the refrigerant. The compressor 1, condenser 2, expansion valve 3, and heat collector 4 are sequentially connected to form a closed circuit 6,
5) A water heater, which has a heat exchange relationship with the condenser 2 and raises the temperature of water. 6 is a hot water tank, and 7 is a water circulation pump.

Further, the water heater 5, hot water storage tank 6, and water circulation pump 7 are connected to form a hot water supply circuit.

Next, the effect will be explained. The high-temperature, high-pressure refrigerant gas compressed by the compressor 1 flows into the condenser 2, where it is condensed and liquefied as a supercooled liquid, flows into the expansion valve 3, is depressurized, and flows into the heat collector 4. Then, solar heat and air heat from natural ventilation are collected, evaporated, and returned to the compressor 1. On the other hand, condenser 2
The water heater 5, which has a heat exchange relationship with the water heater 5, uses condensation heat to raise the temperature of water sent from the water circulation pump 7,
Go back and complete one cycle. Then, the water temperature in the hot water tank 6 is gradually increased as the operation time elapses.

Here, since the heat collector 4 has a fin tube type configuration consisting of a heat collection pipe 4a and a heat collection fin 4b, the heat transfer area on the air side with respect to the total pipe length of the heat collection pipe 4a is extremely large, and the amount of heat absorbed by the air increases. do. Furthermore, as shown in FIG.
a l /nlb''C) becomes larger. However, since the fin spacing 5p is large, the number of heat collecting fins 4b decreases, and the air side heat transfer area Ao becomes smaller. Therefore, the air heat absorption amount QE-an・Ao・Since it is expressed as ΔT, if ΔT (outside air temperature - temperature of heat collecting fin 4b) is constant, air heat absorption QE is proportional to 12n-Ao.Therefore, as shown in FIG. If the interval 5p is 4 to 6 mm, a n-Ao will be maximum, so the air heat absorption will be maximum.Also, the interval Pp between the heat collecting pipes 4d is as shown in Fig. 5.
If Pp is made smaller, the performance will be improved by improving the fin efficiency of the heat collecting fins 4b and increasing the heat transfer area. However, P
Even if p is made smaller than a certain value, there will not be much improvement. This is because reducing Pp increases the overall length of the heat collection pipe 4a in the heat collector 4, which increases the pressure loss on the refrigerant side, and also reduces the improvement in fin efficiency. . Furthermore, if Pp is made smaller, the amount of refrigerant to be filled will increase and there is a possibility that it will exceed the allowable amount of the refrigerant to be filled in the equipment, which is not preferable from the standpoint of equipment reliability.

- BubaPp If k is increased, the performance will drop sharply from a certain value due to a decrease in fin efficiency and heat transfer area. Therefore, the spacing between the heat collecting pipes is 40 to 6
0 mm is optimal.

As explained in Section 2 of ``Effects of the Invention'', the present invention constructs a refrigerating cycle consisting of a closed circuit by sequentially connecting a compressor, a condenser, an expansion valve, and a heat collecting dyk, and collects solar heat and air heat. Heat collector [
The configuration of the heat collector in b- is a fin tube type structure in which heat collecting fins are stacked at regular intervals in the axial direction of the heat collecting pipe, and the heat collecting fin spacing is 4 to 6 mm, and the heat collecting pipe spacing is 40 to 60 mm, the air heat absorption per unit area of solar radiation heat receiving increases by 1;゛, making it possible to miniaturize the heat collector, reduce installation space and equipment costs, and reduce the heat absorption when there is no wind outdoors. (during natural convection), the amount of heat absorbed by the air increases.Also, the maximum performance can be achieved while ensuring the reliability of +d:÷.

[Brief explanation of the drawing]

Figure 1 (is a configuration diagram showing a conventional solar heat collector; Figure 2
The figure is a configuration diagram of a solar heat collector according to an embodiment of the present invention, Figure 3 is a plan view of the heat collector in the solar heat collector, and Figures 4 and 5 are characteristics of the collector. It is a diagram. 1... Cotton compressor 2... Condenser, 3...
...Expansion valve, 4... Heat collector, 4a...
・Heat collection pipe, 4b...Heat collection fin, 5...
...Water heater, 6...Hot water tank, 7...
・Water circulation pump. Name of agent Patent attorney Toshio Nakao and 1 other person - C Ball Figure 3 fρ Inter-fin V height (mm+

Claims (1)

[Claims] A refrigerant closed circuit in which a compressor, a condenser, an expansion device, and a heat collector for collecting solar heat and air heat are connected in sequence, and the condenser is connected to a water heater having a heat exchange means, a hot water storage tank, and a water circulation pump. The heat collector has a fin-tube type structure in which a plurality of fins are stacked at intervals, and the fin interval is 4 to 6 mm, and the tube interval is 4.0 to 4.
6 o'clock solar heat collection device.