TWM507506U - Direct expansion heat recovery energy saving device - Google Patents

Description

Direct expansion heat recovery energy saving device

This creation belongs to the field of air-conditioning technology, especially refers to a direct expansion multiple heat recovery energy-saving device, which is especially suitable for applications where temperature and humidity control are required. This creation only needs to start the compressor, and it can be cooled at the same time by heat recovery. Dehumidification, reheating and humidification.

China is an island-type climate. In most of the year, most of the days are wet weather. Various industries have realized the importance of temperature control and humidity control in order to achieve product quality improvement or develop high-tech technology. . Along with the progress of the times, various industries seek to achieve product quality improvement or develop high-tech technology, and their working environment needs to be in a state of constant temperature and humidity, and many electronic devices installed in the data center are provided with circuit boards. And electronic components, if the surrounding environment of the data center is too dry, the static electricity is easily generated between the circuit board and the electronic components, or the surrounding environment is too humid, and the circuit board and electronic components are prone to rust in the environment for a long time. Therefore, high-efficiency constant temperature and humidity air conditioning equipment must be installed in data centers or other working environments.

Generally, the constant temperature and humidity air conditioning equipment processes the air by passing the indoor air through the cooling and dehumidifying coil, so that the air is simultaneously cooled and dehumidified, until the dew point temperature lower than the indoor air temperature and humidity is reached, and then the air is sent to the room. The indoor air temperature and humidity are simultaneously reduced. However, during operation, the indoor air temperature is easier to reach the set point than the humidity first. In order to maintain the temperature Constant, while the cooling dehumidification coil can continue to dehumidify, so after the air passes through the cooling dehumidification coil, the heater is set to heat the air, so that the indoor air temperature is kept constant until the indoor air humidity reaches the set point, then the cooling and dehumidification coil is controlled to be lowered. The energy, but the use of electric heat as a reheat device, its cost is low, but the running electricity bill is very wasteful. That is to say, the compressor of the conventional direct expansion constant temperature and humidity system has only the cooling and dehumidifying functions, and the reheating and humidifying functions must be replaced by an electric heater and an electric humidifier.

Moreover, the heat dissipation (or heat absorption) of the conventional heat exchanger is to control the flow rate of the refrigerant or the air (or water) of the heat exchanger to achieve the required heat transfer amount, or temperature and humidity conditions, for example, control. The flow rate and temperature difference of the primary side fluid (refrigerant) of the heat exchanger to achieve the required heat exchange amount (high temperature or low temperature), or to control the flow rate and temperature difference of the secondary side fluid (water or air) of the heat exchanger to achieve The amount of heat exchange required (high or low temperature). However, because the compressor refrigerant discharges high-pressure gas is high-pressure gas, first, the flow rate is difficult to control, and second, when controlling the refrigerant flow rate and pressure change, it will indirectly affect the operation of the compressor.

Because the refrigerant system is not easy to control, there are secondary refrigerant systems, such as frozen brine systems, air conditioning ice water systems or hot water systems, with secondary refrigerants for cooling, dehumidification, and heating, but the system is more complicated. And huge. That is, the conventional heat exchanger heats (or absorbs heat) to control the temperature difference of the flow of the primary side fluid (secondary refrigerant such as brine, ice water or hot water) to achieve the required heat transfer, or temperature. , humidity conditions, for which it is missing.

In view of the lack of the aforementioned conventional technologies, the creators of this case have accumulated many years of practical knowledge in the design and construction of air-conditioning products. After continuous research and improvement, the creation of this creation has been successful and made public.

The reason is that the main purpose of this creation is to provide a direct expansion heat recovery energy-saving device, which is mainly composed of a compressor, a condenser, an expansion valve and an evaporator to form a complete refrigeration cycle, which is characterized in that the condenser is the first one. The condenser and the second condenser are connected in series.

In the creation of the evaporator described above, the first evaporator and the second evaporator are connected in series.

The present invention further includes a third condenser and a fourth condenser connected in series, and the third condenser and the fourth condenser connected in series are connected to the first condenser and the second condenser in series. Parallel, and equipped with a solenoid valve (S) to control the start heat recovery heating or heat recovery humidification function.

The fourth condenser described above is a humidifier.

The humidifier of the present invention includes an external water source control device for controlling the humidification water level, a high temperature refrigerant pipe connecting the heat recovery high temperature refrigerant, heating the humidified water to generate moisture, and the compressed air pipe connecting the air compressor to utilize the compressed air. Air bubbles are generated to increase the contact area of air with water and increase the amount of humidification.

The present invention further includes a second compressor that is connected to the compressor and connected back to the original refrigeration cycle.

(COM)‧‧‧Compressors

(COM2)‧‧‧Second compressor

(CON)‧‧‧Condenser

(CON1)‧‧‧1st condenser

(CON2)‧‧‧2nd condenser

(CON3)‧‧‧3rd condenser

(CON4) ‧ ‧ 4th condenser

(EXP)‧‧‧Expansion valve

(EVP)‧‧Evaporator

(EVP1)‧‧‧1st evaporator

(EVP2)‧‧‧2nd evaporator

(HC) ‧ ‧ reheat coil

(CC)‧‧‧Cooling coil

(S)‧‧‧ solenoid valve

(HR)‧‧‧Humidifier

(HRA)‧‧‧External water source control unit

(HRB)‧‧‧High temperature refrigerant piping

(HRC)‧‧‧Compressed air lines

(HRD)‧‧ Air compressor

(1) ‧‧‧ body

(10) ‧‧‧Device space

(11) ‧ ‧ constant temperature and humidity space in the cabinet

(2) ‧ ‧ ‧ outside the cabinet constant temperature and humidity space

(SF)‧‧‧Air blower

(SA)‧‧‧Air outlet

(RA) ‧‧‧ return air outlet

Fig. 1 is a conventional basic refrigeration cycle pressure map; Fig. 2 is a compression cycle diagram of the present creation cycle; Fig. 3 is a schematic view of the apparatus of the first embodiment of the present creation; and Fig. 4 is a schematic view of the apparatus of the second embodiment of the present creation Figure 5 is a schematic view of the apparatus of the third embodiment of the present invention; Figure 6 is a schematic view of the present humidifier; Fig. 7 is a schematic view showing the apparatus of the fourth embodiment of the present invention; Fig. 8 is a schematic view showing the apparatus of the fifth embodiment of the present invention; and Fig. 9 is a schematic view showing the fifth embodiment of the present invention applied to the industrial space.

This creation is about a direct expansion heat recovery energy-saving device that only needs to start the compressor. With heat recovery, it can simultaneously have cooling, dehumidification, reheat and humidification functions.

Please refer to the traditional basic refrigeration cycle pressure map of Figure 1, which can be seen as follows:

1. Compression process a-b (compressor)

W _c = G ×( h _b - h _a )

2. Condensation process b-c (condenser)

Q _c = G ×( h _b - h _c )

3. Throttling process c-d (expansion valve)

h _d = h _c

4. Evaporation process d-a (evaporator)

Q _e = G ×( h _a - h _d )

Compressor balance

Q _c = Q _e + W _c

If Qc and Qe are unbalanced, the compressor will trip due to high and low voltage abnormalities.

Formula symbol description:

W _c = compressor power KJ/S (KW)

G=refrigerant mass flow rate KG/S

h=refrigerant value KJ/KG

Q _c = heat dissipation per unit time of the condenser KJ/S (KW)

Q _e = heat absorption per unit time of the evaporator KJ/S (KW)

Please refer to Figure 2 for the creation of the refrigerating cycle pressure map, which can be seen as follows:

1. Compression process a-b (compressor)

W _c = G ×( h _b - h _a )

2. Condensation process b-c (condenser)

Q _c =Q _{c 1} +Q _{c 2}

Q _{c 1} =G(h _b - h _X )= G _{f 1} ×C _{f 1} ×△ T ₁

Q _{c 2} =Q _c -Q _{c 1} =Q _c - G _{f 1} ×C _{f 1} ×△ T ₁

Note: Qc=constant under fixed conditions, so the value of Qc1 can be precisely controlled by precisely controlling the value of Qc1.

3. Throttling process c-d (expansion valve)

h _d = h _c

4. Evaporation process d-a (evaporator)

Q _e =Q _{e 1} +Q _{e 2}

Q _{e 1} =G(h _Y - h _d )= G _{f 2} ×C _{f 2} ×△ T ₂

Q _{e 2} =Q _e -Q _{e 1} =Q _e - G _{f 2} ×C _{f 2} ×△ T ₂

Qe = constant under fixed conditions, so precise control of the value of Qe1 can accurately control the value of Qe2.

Compressor balance

Q _c = Q _e + W _c

(Q _{c 1} +Q _{c 2} )=( Q _{e 1} + Q _{e 2} )+ W _c

Qc1 and Qc2, Qe1 and Qe2 form a complementary relationship, so the total amount of Qc, Qe and Wc is easy to balance, and it is not easy to cause high and low pressure abnormalities of the compressor and tripping.

Formula symbol description:

W _c = compressor power KJ/S (KW)

G=refrigerant mass flow rate KG/S

h=refrigerant value KJ/KG

Q _c = total heat dissipation per unit time of the condenser KJ/S (KW)

Q _{c 1} = heat dissipation per unit time of the condenser KJ/S (KW)

Q _{c 2} = heat dissipation of the condenser 2 unit time KJ/S (KW)

G _{f 1} = mass flow rate KG/S of the secondary side fluid (water or air) of the condenser 1

C _{f 1} = condenser 1 secondary side fluid (water or air) specific heat KJ / KG ° C

ΔT ₁ = temperature difference of the secondary side fluid (water or air) of the condenser 1 °C

Q _e = total heat absorption per unit time of the evaporator KJ/S (KW)

Q _{e 1} = total heat absorption per unit time of the evaporator 1 KJ/S (KW)

Q _{e 2} = total heat absorption per unit time of evaporator 2 KJ/S (KW)

G _{f 2} = secondary flow (water or air) mass flow rate KG/S of evaporator 1

C _{f 2} = evaporator 1 secondary side fluid (water or air) specific heat KJ / KG ° C

ΔT ₂ = temperature difference of the secondary side fluid (water or air) of the evaporator 1 °C

In the creation heat dissipation process, at least two condensers (CON1~2) are connected in series to control the amount of heat dissipation (Qc2) required for the second condenser, instead of controlling the flow temperature difference of the primary side fluid (refrigerant) of the second condenser, It is proportionally controlling the heat dissipation amount (Qc1) of the first condenser, that is, forming the X point on the heat dissipation process line on the second drawing, so that the X point can be moved left and right, thereby achieving the precise heat required for controlling the second condenser. The quantity (Qc2), that is to say the total amount of heat dissipation in the condensation cycle condensation process is limited (under fixed conditions), the total amount of heat dissipation - heat dissipation = the required heat dissipation amount, ie Q _c -Q _{c 1} =Q _{c 2} .

This endothermic process creation of at least two evaporators (EVP1 ~ 2) connected in series, the heat absorption (Q _{e 2)} required for the second evaporator, the second evaporator instead of controlling the primary-side fluid (refrigerant) flow temperature, Rather, proportionally control the heat absorption (Q _{e 1} ) of the first evaporator, that is, form a Y point on the endothermic process line on the second drawing, so that the Y point can be moved left and right, thereby achieving precise control of the second evaporator. The required heat absorption (Q _{e 2} ), that is to say the total amount of heat absorption in the freezing cycle evaporation process is limited (under fixed conditions), the total heat absorption - the heat absorption = the required heat absorption, ie Q _e -Q _{e 1} = Q _{e 2} .

In order to achieve the above-mentioned technical means for the purpose of the present invention, the embodiments are listed, and the descriptions of the drawings can be better understood by the reviewing committee on the structure, characteristics and effects achieved by the present reviewer.

The creation is a direct expansion heat recovery energy-saving device, which is a disadvantage of improving the traditional direct expansion constant temperature and humidity system. The compressor of the traditional direct expansion constant temperature and humidity system only has the functions of cooling and dehumidification, and the reheating and humidifying functions must use electric heating. Heater and electric humidifier. This creation only needs to start the compressor. With heat recovery, it can simultaneously have cooling, dehumidification, reheat and humidification functions.

The heat exchanger mentioned in this manual mainly refers to the heat exchanger of compressor COM (COMPRESSOR) refrigeration cycle refrigerant. In the basic refrigeration cycle, only the name of evaporator EVP (EVAPERATOR) and condenser CON (CONDENSER) However, this creation places the evaporator and condenser in different positions and has different names, but its main function (heat exchange) remains unchanged. For example, the cooling coil CC (COOLING COIL) is also an evaporator (EVP), the reheat coil HC (HEATING COIL) is also a condenser (CON), and the humidifier HR (HUMIDIFIER) is also a condenser (CON).

The heat exchanger described in this specification is described in an air-cooled manner, that is, the refrigerant exchanges heat with air. However, if partial or full replacement is water-cooled, that is, the refrigerant exchanges heat with water. All functions and principles also apply.

Most of the air-cooled fans described in this manual are described as axial fans. However, if partial or full replacement is made with a centrifugal fan, all functions and principles are also applicable.

Please refer to FIG. 3, which shows that the present embodiment is mainly composed of a compressor (COM), a condenser (CON), an expansion valve (EXP), an expansion valve EXPANSION VALVE, and an evaporator (EVP). The refrigeration cycle is characterized in that the condenser (CON) is composed of a first condenser (CON1) and a second condenser (CON2) connected in series. The amount of heat required to control the second condenser (CON2) is proportionally controlled to control the amount of heat dissipated by the first condenser (CON1) to accurately control the amount of heat required for the second condenser (CON2), and the second condenser It is used as a heat recovery heater and does not affect the normal operation of the compressor. That is to say, only the compressor needs to be started, and by heat recovery, the cooling, dehumidification and heating functions can be simultaneously performed. It is suitable for industries that require low-humidity constant temperature (low temperature), such as food low-temperature drying processes, warehouses, etc. The second condenser (CON2) of the present invention may be a reheat coil (HC), and the evaporator (EVP) may be a cooling coil (CC).

Referring to Fig. 4, the evaporator (EVP) of the present invention is composed of a first evaporator (EVP1) and a second evaporator (EVP2). In this embodiment, the amount of heat required to control the second condenser (CON2) is proportionally controlled to control the amount of heat dissipated by the first condenser (CON1) to accurately control the amount of heat required for the second condenser (CON2). 2 The condenser is used as a heat recovery heater, and does not affect the normal operation of the compressor. The heat absorption required by the second evaporator proportionally controls the heat absorption of the first evaporator to precisely control the second evaporation. The heat absorption required by the device, the second evaporator is used for cooling and dehumidification purposes. When the capacity is lower than the heat recovery heater, the system has a high temperature heating effect and does not affect the normal operation of the compressor. That is to say, only the compressor needs to be started, and by heat recovery, the cooling, dehumidification and heating functions can be simultaneously performed. Suitable for low-temperature drying process of food, etc. (higher temperature) industry. The second evaporator (EVP2) of this creation is a cooling coil (CC).

Referring to Figure 5, the creation further includes a third condenser (CON3) and a fourth condenser (CON4) connected in series, and the third condenser (CON3) and the fourth condenser (CON4) in series. Then, the first condenser (CON2) and the second condenser (CON2) connected in series are connected in parallel and connected in parallel, and a solenoid valve (S) [solenoid valve SOLENOID VALVE] is provided to control the start of heat recovery heating or heat. Recycle humidification function. That is to say, only the compressor needs to be started, and by heat recovery, it can simultaneously have the functions of cooling, dehumidification, heating and humidification. Applicable to the computer room, electronic constant temperature and humidity machine, dewaxing casting shell mold drying process, etc., which requires constant temperature and humidity.

The fourth condenser (CON4) of the present invention is a humidifier (HR), as shown in Fig. 6, the humidifier (HR) mainly includes humidified water, an external water source control device (HRA), and a high temperature refrigerant. Tube (HRB), compressed air line (HRC) and air compressor (HRD), the external water source control unit (HRA) is used to control the humidification water level, and the high temperature refrigerant line (HRB) is connected to the third condenser at one end ( CON3), the other end is connected back to the expansion valve (EXP) to recover the high temperature refrigerant supplied by the third condenser (CON3), heat the humidified water to generate moisture, and the compressed air line (HRC) is connected to the air compressor ( HRD), using compressed air to generate bubbles to increase the contact area between air and water, increasing the amount of humidification [The high temperature refrigerant provided by the third condenser (CON3) is not high enough to effectively evaporate water and gas, and must be exposed The gas device is a compressed air line (HRC) and a air compressor (HRD), which increases the heat exchange area between water and air. The calculation formula is as follows].

The calculation of the humidification amount of the aforementioned heat recovery humidifier: in an open water tank, the evaporation of water from the water surface depends on the saturation humidity ratio corresponding to the water temperature, the humidity ratio in the air, and the contact area between the air and the water ( The water level and the water surface), and the velocity of the air above the surface. The amount of water evaporated can be expressed as: G _h = ( θA ₁ + C ₃ A ₂ ) (X _s - X )

Formula description:

G _h = amount of water evaporated per hour (kg/hr)

θ = (C1 + C2 V) = evaporation coefficient (kg / m ² h)

C1 = constant (no unit) under fixed conditions

C2 = constant (no unit) under fixed conditions

C3 = constant (kg/m ² h) under fixed conditions

V = the speed of the air above the water surface (m / s)

A1=contact area of air and water on the horizontal plane (m ² )

A2 = contact area of microbubble air with water in the horizontal plane (m ² )

X _s = humidity ratio of saturated air water at this water temperature (kg/kg)

X = humidity ratio in air (kg/kg)

note! The units θ, C3 do not match because this is an empirical formula - the result of the experiment.

Referring to Fig. 7, the present invention further includes a second compressor (COM2) which is connected in parallel with the compressor (COM) and connected back to the original refrigeration cycle. Real The example is a water-cooled dual-compressor heat recovery device, that is, only the compressor needs to be started, and the heat recovery can simultaneously have the functions of cooling, dehumidification, heating and humidification. Applicable to the computer room, electronic constant temperature and humidity machine, dewaxing casting shell mold drying process, etc., which requires constant temperature and humidity.

Referring to Figure 8, the creation further includes a third condenser (CON3) and a fourth condenser (CON4) connected in series, and the third condenser (CON3) and the fourth condenser (CON4) in series. Then, the first condenser (CON2) and the second condenser (CON2) connected in series are connected in parallel and connected in parallel, and a solenoid valve (S) [solenoid valve SOLENOID VALVE] is provided to control the start of heat recovery heating or heat. Recycle humidification function. That is to say, only the compressor needs to be started, and by heat recovery, it can simultaneously have the functions of cooling, dehumidification, heating and humidification. Applicable to computer room, electronic constant temperature and humidity machine, sauna oven space, dewaxing casting shell mold drying process, etc. Need constant temperature and humidity industry.

The actual application of this creation is applied to the industrial space. Taking Figure 9 as an example, the creation also includes an organism (1). The body (1) is separated by a device space (10) and a constant temperature and humidity space (11) in the cabinet to set The foregoing components of the creation include a constant temperature and humidity space outside the cabinet (2), and the constant temperature and humidity space (11) in the cabinet is provided with a blower fan (SF) to connect the air outlet of the constant temperature and humidity space outside the cabinet (2) (SA) ), the constant temperature and humidity space outside the cabinet (2) Another return air inlet (RA) is connected to the constant temperature and humidity space (11) in the cabinet for use in various industries.

This creation directly restores the high temperature of the refrigerant to the temperature and humidity conditions required by the system, completely replacing the electric heater or electric humidifier currently used on the market. There may be other different heat recovery methods on the market (such as heat storage heat pump heat recovery), but the creation system is simple, stable and simple to control, and is the best choice for direct expansion of constant temperature or humidity systems.

The foregoing embodiment of the present invention is only for convenience of understanding. The above only describes the most basic circulation system of single-stage compression single-stage expansion, if applied to multiple compressor parallel systems, multi-stage compressors. The above-mentioned working principle is also applicable to the system, the refrigerant circuit parallel system, the multi-stage expansion system or the multi-element refrigerant system, and will not be repeated here.

In summary, the "direct expansion heat recovery energy-saving device" disclosed in this creation is unprecedented, and has not been seen in publications published at home and abroad. It has a novel patent requirement, and this creation can indeed eliminate the use of the application. The lack of technology and the achievement of the purpose of creation have also fully complied with the patent requirements, and the application has been filed according to law. I would like to ask your review committee to give a review and give the patent in this case.

However, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. For those skilled in the art, the equivalent structural changes made by the present specification and the scope of the patent application are It should be included in the scope of this creation patent.

(COM)‧‧‧Compressors

(CON)‧‧‧Condenser

(CON1)‧‧‧1st condenser

(CON2)‧‧‧2nd condenser

(CON3)‧‧‧3rd condenser

(CON4) ‧ ‧ 4th condenser

(EXP)‧‧‧Expansion valve

(EVP)‧‧Evaporator

(EVP1)‧‧‧1st evaporator

(EVP2)‧‧‧2nd evaporator

(HC) ‧ ‧ reheat coil

(CC)‧‧‧Cooling coil

(S)‧‧‧ solenoid valve

(HR)‧‧‧Humidifier

Claims (7)

The utility model relates to a direct expansion heat recovery energy-saving device, which mainly comprises a compressor, a condenser, an expansion valve, an evaporator and a compressor connected to a compressor to form a complete refrigeration cycle, wherein the condenser is composed of a first condensation. The second condenser is connected in series, and the amount of heat required to control the second condenser is proportionally controlled to control the amount of heat released by the first condenser to accurately control the amount of heat required for the second condenser, and the second condensation The device is used as a heat recovery heater and does not affect the normal operation of the compressor. The direct expansion heat recovery energy-saving device according to claim 1, wherein the evaporator is composed of a first evaporator and a second evaporator, and the heat absorption required for the second evaporator is proportionally controlled. The heat absorption of the first evaporator is used to precisely control the heat absorption required by the second evaporator, and the second evaporator is used for cooling and dehumidification purposes. When the capacity is lower than that of the heat recovery heater, there is a high temperature heating effect. And will not affect the normal operation of the compressor. The direct expansion heat recovery energy-saving device according to claim 1, further comprising a third condenser and a fourth condenser connected in series, wherein the third condenser and the fourth condenser in series are connected in series The first condenser and the second condenser are connected in parallel in parallel with each other, and a solenoid valve is provided to control the start heat recovery heating or the heat recovery humidification function. The direct expansion heat recovery energy-saving device according to claim 3, wherein the fourth condenser is a humidifier. The direct expansion heat recovery energy-saving device according to claim 4, wherein the humidifier mainly comprises humidification water, an external water source control device, a high-temperature refrigerant pipe, a compressed air pipeline, and an air compressor, the foregoing external The water source control device is used to control the humidification water level. One end of the high-temperature refrigerant line is connected to the third condenser, and the other end is connected back to the expansion valve to recover the high-temperature refrigerant supplied from the third condenser, and heat the humidified water to generate moisture. a compressed air line is connected to the air compressor to generate air bubbles by using compressed air to Increase the contact area between air and water to increase the amount of humidification. The direct expansion heat recovery energy-saving device according to claim 3, further comprising a second compressor connected to the compressor and connected to the original refrigeration cycle. The direct expansion heat recovery energy-saving device according to claim 2, further comprising a third condenser and a fourth condenser connected in series, wherein the third condenser and the fourth condenser in series are further The serially connected first condenser and the second condenser are connected in parallel in parallel with each other, and a solenoid valve is provided to control the start heat recovery heating or the heat recovery humidification function.