JPS61128043A - Air conditioner having heat accumulating circuit - Google Patents

Abstract

PURPOSE:To cause meeting of a load even when emergency occurs without needing complicated control, by a method wherein a heat accumulating tank, a switching valve, a flow rate regulating means, and a pump are connected to the secondary side circuit of a heat exchanger to constitute the secondary side circuit in an open type cold and hot water piping system. CONSTITUTION:The secondary side circuit of a heat exchanger includes a heat accumulating tank 23, a pump 24 for heat accmulation and endothermic use, endothermic switching valves 31, 32, 33, 34, 35 and 36, and a thermostat 41. The switching valves 31 and 32 are also functioned as a flow rate regulating valve. further, a flow switch 22, adapted to control the starting and a stop of the pump 24 on the secondary side through detection of a flow, and a thermostate 42 are inserted in the primary side circuit. When the load on the air conditioner 11 side is decreased, a water quantity on the heat source side is excessively increased in feed, and a flow in a direction A is produced in a bypass circuit. The flow switch 22 detects said flow to start the pump 24, and the switching valves are respectively opened and closed to form a circuit for accumulating heat in the heat accumulating tank.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat storage type air conditioner suitable for heating and cooling buildings such as hospitals and animal research institutes that require air conditioning even in emergencies.

Many buildings require air conditioning for life safety, even in emergencies when conventional technology air conditioning equipment breaks down or is shut down for repairs. For this purpose, an air conditioning system equipped with a heat storage tank is adopted, but the heat storage tank is generally installed in the open cold/hot water piping system of the air conditioner, so it becomes a large capacity heat storage tank that can accommodate a large flow rate. Not only does this increase equipment and operating costs, but it also requires corrosion-resistant piping treatment. Therefore, a system has been proposed that switches the piping system between an open type and a closed type, but this not only complicates the piping system but also makes the piping switching operation difficult. There is a risk that some parts of the product may be damaged.
Practical implementation was fraught with difficulties.

Hospitals often use cold/hot water generators, but since it is not possible to keep the cold water out at a very low temperature, measures such as increasing the number of rows of cooling coils or increasing the pump head are needed to increase the dehumidification capacity. This had the disadvantage of increasing running costs.

In JP-A No. 57-65527 ``Air conditioning system for high-rise buildings'', a bypass circuit is installed in parallel to the circuit connecting the heat storage tank and the chiller, and a heat exchanger is placed in the bypass circuit to improve the thermal efficiency of the entire system. Raising the straw.

However, in this piping system, the heat storage tank is directly connected to the open cold/hot water piping system, which not only requires corrosion prevention measures as mentioned above, but also increases costs such as equipment costs and operating costs. As such, it does not result in much cost reduction. In addition, there is a drawback that control becomes complicated.

Problems to be Solved by the Invention An object of the present invention is to provide an air conditioner that has low initial cost and running cost, does not require complicated control, and can meet the load even in an emergency.

Means for Solving Problems and Their Effects The above-mentioned object of the present invention is to provide a bypass circuit in parallel with a cold/hot heat source in a closed cold/hot water piping system of an air conditioner, and to install a heat exchanger in the bypass circuit. Insert the bypass circuit to make the primary side circuit of the heat exchanger, and connect the heat storage tank, switching valve, flow rate adjustment means, and pump to the secondary side of the heat exchanger [circuit] to make the secondary side circuit open type. This is achieved by configuring the cold and hot water piping system.

According to this configuration, the closed cold/hot water piping system connected to the air conditioner remains a closed system, and the flow rate flowing through the heat exchanger and bypass circuit only increases during partial load, but there is no effect on the entire system. do not have. Since the flow rate through the secondary circuit of the heat exchanger does not need to be large, the heat storage tank may be small, and the pump and control equipment do not need to be complicated. The fluid stored in the heat storage tank via the heat exchanger can be used as a backup heat source or a peak cut heat source in an emergency.

BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the invention will become clearer from the following description, which refers to the embodiments of the accompanying drawings.

Embodiment FIG. 1 shows an air conditioning system according to a preferred embodiment of the present invention, which includes an air conditioner 11, a refrigerator or a hot water boiler 1.
2. Secondary pump 13 for cold water or hot water, secondary pump 14 for cold water or hot water, load adjustment valve 15, pressure relief valve 16,
In a closed cold/hot water piping system including an expansion tank 17,
A bypass circuit 20 is provided in parallel with the cold/hot heat source, and a heat exchanger 21 is inserted into the bypass circuit to complete the bypass circuit 20.
is connected as a primary circuit of the heat exchanger 21. The secondary circuit of the heat exchanger includes a heat storage tank 23, a heat storage/heat absorption pump 24, and heat storage/heat absorption switching valves 31, 32, 33, 34.
, 35, 36 and a thermostat 41.

The switching valves 31, 32 also act as flow regulating valves. Furthermore, a flow switch 22 and a thermostat 42 are inserted into the primary circuit to detect the flow and control the start and stop of the secondary pump 24.

Since the air conditioning system of the present invention is configured as described above, the load on the air conditioner 11 side and the refrigerator (or hot water boiler) 1
If the heat supply from the two sides matches, the bypass circuit 20
The flow rate flowing through becomes zero, and the flow switch 22 becomes OF.
F and the pump 24 is stopped.

When the load on the air conditioner 11 side decreases, the amount of water on the heat source side becomes excessively supplied, causing an incoming flow into the bypass circuit as shown in FIG. The flow switch 22 detects this flow, starts the pump 24, and opens and closes the switching valves to form a circuit for storing heat in the heat storage tank. In order to keep the temperature of the heat stored water constant, the temperature Tl of the thermostat 41 is
The flow rate adjustment valve 32 is throttled using the .

If the heat storage tank 23 has already stored enough heat, the pump 24 is stopped even if there is a flow in the incoming direction. The pump 24 is also stopped when the heat storage operation is completed.

In this way, the heat storage operation is performed almost automatically.

In an emergency when the refrigerator (or hot water boiler) cannot be operated due to breakdown or repair, the switching valve is operated to form an endothermic circuit as shown in FIG. 3. A flow in direction B is generated on the primary side of the heat exchanger by the operation of the pump 14 (FIG. 1). In order to keep the water temperature in the bypass circuit 20 constant, the flow rate regulating valve 31 is throttled using the temperature T2 of the thermostat 42.

The device of the present invention can also be used for a relatively long period of time as a peak cut operation when one of the refrigerators (or hot water boilers) stops when there are multiple refrigerators (or hot water boilers).

Effects of the Invention As explained in detail above, according to the present invention, a backup heat source can be obtained by equipping a relatively small heat storage tank, heat exchanger, and fluid equipment. Compared to conventional heat storage type equipment, the initial cost and running cost are significantly lower, and there is no need for complicated control.
Its effects are extremely remarkable, such as being able to meet the load even in an emergency.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an air conditioner according to the present invention;
FIG. 2 is a system diagram showing the operation of storing heat in the heat storage tank, and FIG. 3 is a system diagram showing the operation of absorbing heat from the heat storage tank. 11... Air conditioner 12... Freezer 13.1
4... Pump 15.16... Valve 20... Bypass circuit 21... Heat exchanger 22... Flow switch 23... Heat storage tank 24... Pump 3
1-36・＠-Sho41.42・φ・Thermostat Patent Applicant Shinryo Corporation Representative Patent Attorney Tadashi Ninomiya Komaku 15 #2 Diagram #3 Diagram

Claims (1)

[Claims] 1. In a closed cold/hot water piping system of an air conditioner, a bypass circuit is provided in parallel with the cold/hot heat source, a heat exchanger is inserted into the bypass circuit, and the bypass circuit is connected to the heat exchanger. The primary circuit is the heat exchanger's secondary circuit, and the heat storage tank, switching valve,
An air conditioner characterized in that a secondary circuit is configured as an open cold/hot water piping system by connecting a flow rate adjusting means and a pump. 2. The air conditioner according to claim 1, wherein the operation of the pump in the secondary circuit is controlled by detecting at least the flow in the primary circuit out of the flow in the primary circuit and the water temperature in the secondary side. Device.