JPH0245725Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention operates a refrigerator in an air conditioner for places such as computer rooms and measurement control rooms that require annual cooling and require highly accurate temperature and humidity. During the summer to mid-season and winter months, the refrigerator is stopped and air conditioning is performed using cold water cooled by the atmosphere.When switching to cooling water cooling operation, the temperature of the blown air is kept as constant as possible. This is an air conditioner to keep things cool.

Generally, when operating a refrigerator for cooling, appropriate reheating is required to keep the blown air constant in situations where the cooling load decreases and the refrigerator output becomes excessive. Let's do it.

There are two ways to do this: cooling water that has passed through a condenser and has become hot water is sent to a reheater to reheat the blown air (condenser reheat), or refrigerant gas (hot gas) is sent from the refrigerator to the condenser. ) is reheated by sending it to a reheater (hot gas reheating).

All of these methods are systems in which a refrigerator is operated continuously to cool the blown air.

However, from the middle season to the winter season, the outside air temperature drops to a state where the temperature of the cooling water is lower than the temperature of the air blown by the air conditioner. In such a case, the chilled water in the above state can be created by stopping the refrigerator and passing the cooling water that circulates through the condenser through the cooling tower, and this cold water cools the blown air. be able to. The method carried out in this manner is referred to as the above-mentioned cooling water cooling, and since cooling can be performed by stopping the refrigerator, the energy saving effect obtained by this method is extremely large.

However, in order to operate continuously and maintain the temperature of the blown air at a constant temperature, it is necessary to remove the heat stored in the condenser reheater and hot gas reheater and the heat stored in the piping (cooling) when the refrigerator starts and stops alternately. It will be difficult to switch to cooling water cooling unless the heat from the water is removed.

Therefore, an object of the present invention is to provide a device that can control the blown air while maintaining a stable temperature state without causing the blown air to be heated even temporarily as described below.

In the figure, 1 is the air conditioner body with free access 2
The casing is placed on the floor of the air conditioner, and each component of the air conditioner is housed in the casing.

A cooling unit is formed by disposing a cooler 4, a refrigerator 5, a condenser 6, a blower 7, and a driving electric motor 8 installed in a cooling air passage 3 in the air conditioner.

Further, a heat exchanger 9 and a hot gas reheater 10 are installed below the cooler 4, which function as a reheater or a cooling water cooling coil.

11 is an indoor air inlet, 12 is an outlet, 13,
14 is a bypass damper, and 15 is an air filter.

The refrigerant piping system includes a refrigerant three-way solenoid valve 16, refrigerant solenoid valves 17, 18, 19, and refrigerant stop valves 20, 21,
22 and 23 are attached.

The cooling water piping system includes a three-way valve 2 for the heat exchanger 9.
4, a three-way cooling water valve 25, a cooling tower 26, and a cooling water circulation pump 27 are provided.

28 and 29 are hot gas pipes connecting the refrigerator 5 and the condenser 6, 30 is a hot gas pipe to the hot gas reheater 10, 31 is an auxiliary hot gas pipe for reheating to the cooler 4, and 32 is a hot gas pipe connecting the refrigerator 5 and the condenser 6; A liquid pipe 34 runs from the condenser 6 to the expansion valve 33, and a suction gas pipe 34 runs from the expansion valve 33 through the cooler 4 to the refrigerator 5.

35 is a cooling water pipe connecting the cooling tower 26 to the condenser 6, 36 is a cooling water pipe connecting the condenser 6 to the reheater 9, and 37 is a cooling water pipe connecting the heat exchanger 9 and the cooling tower 26. Cooling water pipe connected to 3
8 is an auxiliary cooling water pipe (bypass pipe) connecting the cooling water pipes 36 and 37; 39 is the cooling water pipe 35;
Auxiliary cooling water pipe (bypass pipe) connecting and 37
It is.

40 is a thermostat that detects the indoor temperature, 4
1 is a thermostat that senses the outside temperature, 42
43 is a thermostat that senses the temperature of the cooler 4; 43 is a thermostat that senses the blowout temperature and controls the three-way valve 24 for the heat exchanger 9; and 44 is a thermostat that senses the blowout temperature and controls the refrigerant three-way solenoid valve 16. It is a thermostat that is activated.

Next, to explain the operation, the indoor air is
The air is sucked in from the indoor air suction port 11 and passes through the cooler 4, the heat exchanger 9 that serves as a reheater or a cooling water cooling coil, the hot gas reheater 10, and the bypass dampers 13 and 14. It is mixed with air and blown out from the outlet 12 under the floor.

In the cooling operation, the air is cooled by the cooler 4 through a normal refrigeration cycle, and the three-way valve 24 is controlled to prevent hot water from flowing into the heat exchanger 9 by the thermostat 43 located at the underfloor outlet. During operation, the temperature of the blown air is kept almost constant.

In the condenser reheat operation, the thermostat 43 automatically controls the three-way valve 24 so that hot water flows into the heat exchanger 9, reheats the air cooled by the cooler 4, and cools the blown air. It is operated with the temperature kept almost constant.

In cooling operation and condenser reheat operation,
The thermostat 40 disposed at the indoor air intake port 11 controls the capacity control mechanism of the refrigerator 5 in two stages, controlling the capacity in stages from 100% to 66% and from 66% to 33%, while also controlling a portion of the cooling in between. By closing the solenoid valve 18 installed in the refrigerant liquid pipe to the cooler 4 and cooling the air with only one circuit of the cooler 4,
%, 50% to 33%, and performs three-stage control to maintain a stable temperature of the blown air during light-load operation, and to shift to energy-saving operation that reduces power consumption.

In addition, in order to accelerate startup during startup in winter, thermostat 4 is installed at the underfloor air outlet.
4, the refrigerant three-way solenoid valve 16 is configured to pass hot gas from the refrigerator 5 to the hot gas reheater 10.
is activated to quickly stabilize the startup state.

In addition, a thermostat 42 disposed on the air outlet side of the cooler 4 and a refrigerant solenoid valve 19 controlled by the thermostat 42 are electrically connected, so that the temperature on the air outlet side of the cooler 4 is lower than the set temperature. When the refrigerant solenoid valve 19 is exhausted, hot gas is passed through the cooler 4 to keep the evaporation pressure of the cooler 4 constant, thereby keeping the temperature of the cooler surface constant and stabilizing the air outlet temperature. That's what I do.

The cooling operation, condenser reheating operation, that is, switching from the operation of the refrigerator 5 to the cooling water cooling operation is performed when the temperature of the outside air reaches the temperature condition set by the thermostat 41 located outdoors, and
The three-way valve 24 is configured to stop the flow of high-temperature cooling water to the reheat heat exchanger 9 when the temperature of the cooling water reaches the temperature condition set by the water temperature detection end installed in the cooling water piping system. The water in the heat exchanger 9 is cooled by cold air passing through the cooler 4.
Also, a timer (not shown) is operated for a set time so that the three-way valve 25 of the circulating water is forcibly opened and the entire amount of water is circulated to the cooling tower 26 to lower the temperature of the cooling water.

During this time, the refrigerator 5 is still working, so the air flowing into the room through the cooler 4 becomes too cold.

In this invention, in order to prevent this temporary over-cooling, the thermostat 44 placed at the underfloor outlet as described above operates, and the refrigerant three-way solenoid valve 16 is automatically controlled thereby, causing the refrigerator 5 to be discharged. A part or all of the hot gas in the hot gas pipe 28 is sent to the hot gas reheater 10 to reheat the cold air that has come out of the cooler 4, thereby achieving the effect that the blown air is blown at a constant temperature. be. Therefore, the operation and operation of electronic computers etc. is stabilized.

After this operation is completed, the refrigerator 5 is stopped,
The thermostat 43 and the three-way valve 24 arranged at the underfloor outlet automatically control the amount of water flowing through the heat exchanger 9 as a cooling water cooling coil, so that cooling water cooling operation can be performed while keeping the temperature of the blown air constant. I have to.

Note that when the cooling water cooling operation is continued, when the temperature rises above the set temperature by the thermostat 43 located at the underfloor outlet, and when the temperature exceeds the set intake temperature by the thermostat 40 located at the indoor air intake port 11. When the temperature rises further, the cooling water cooling operation can be switched to the refrigerator operation.

In that case, thermostat 43 and three-way valve 24
The heat exchanger 9, which was working as a cooling water cooling coil, is used as a reheater to automatically control the water flow rate, and the circulating water three-way valve 25 is automatically controlled so that the temperature of the cooling water is set. After the refrigerator is put into operation, the refrigerator 5 is started and the refrigerator is operated normally.

During condenser heat operation, the outside air temperature is checked at 3 points with the thermostat 41 placed outdoors, and when the set conditions are met,
When the temperature of the intake air reaches the set condition by the thermostat 40 disposed at the indoor air intake port 11, the capacity control mechanism of the refrigerator 5 is operated, and the operation is switched to cooling water cooling operation.
This has the effect of reducing power consumption.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of the air conditioner according to this invention. In the drawings, reference numeral 1 is the air conditioner body, 2 is the casing, 3 is the passage, 4 is the cooler, 5 is the refrigerator, 6 is the condenser, 7 is the blower, 8 is the electric motor, 9 is the heat exchanger,
10 is a hot gas reheater, 11 is an indoor air inlet, 12 is an outlet, 13 and 14 are bypass dampers, 15 is an air filter, 16 is a three-way solenoid valve, 1
7, 18, 19 are refrigerant solenoid valves, 20, 21, 2
2, 23 are refrigerant stop valves, 24, 25 are three-way valves, 26
is a cooling tower, 27 is a cooling water circulation pump, 28,2
9, 30, 31 are hot gas pipes, 32 is a liquid pipe, 3
3 is an expansion valve, 34 is a suction gas pipe, 35, 3
6, 37, 38, 39 are cooling water pipes, 40, 41,
42, 43, and 44 are thermostats.

Claims (1)

[Scope of utility model registration request] A refrigerator 5, a condenser 6, a cooler 4, a blower 7, and a cooling tower 26 installed outdoors are provided inside the air conditioner body 1.
Among the cooling water pipes 35, 36, and 37 for the condenser 6 of the refrigerator circuit formed by the above, the cooling water pipe 37 leading from the heat exchanger 9 to the cooling tower 26 has a cooling water pipe disposed on the outlet side of the heat exchanger 9. a three-way valve 24 provided therein, and the blower 7 electrically connected to the three-way valve 24.
A thermostat 43 for detecting the outlet temperature, a three-way valve 25 disposed on the inlet side of the cooling tower 26, and an outdoor thermostat 41 electrically connected to both the three-way valves 24 and 25, A cooling water pipe 38 that short-circuits the heat exchanger 9 is connected to the cooling water pipes 36 and 37 arranged on the inlet side and the outlet side of the heat exchanger 9, and a cooling water pipe 38 is connected to the inlet side and the outlet side of the cooling tower 26. A cooling water pipe 39 that short-circuits the cooling tower 26 is connected to each of the cooling water pipes 37 and 35, and a thermostat 44 for sensing the temperature of the blowing air from the blower 7 is connected from the refrigerator 5 through the hot gas pipe 28. A hot gas pipe 30 is interposed between the refrigerant from the refrigerant three-way solenoid valve 16 controlled by the refrigerant three-way solenoid valve 16, and the hot gas from the refrigerant three-way solenoid valve 16 is The refrigerant three-way solenoid valve 16 closes the hot gas pipe 30 on the hot gas reheater 10 side during reheat operation. When the thermostat 41 detects the set temperature, the three-way valve 24 is closed so that the water flow to the heat exchanger 9 is stopped, and the three-way valve 25 is closed so that water is passed to the cooling tower 26. After a predetermined period of time, the refrigerator 5 is stopped, and then the opening degree of the three-way valve 24 is automatically controlled by the thermostat 43, and the hot gas pipe 29 on the condenser 6 side is opened during cooling operation. An air conditioner characterized by comprising: