CN100451492C - Integrated air-conditioning system of solar-assisted soil source CO2 trans-critical heat pump - Google Patents
Integrated air-conditioning system of solar-assisted soil source CO2 trans-critical heat pump Download PDFInfo
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- CN100451492C CN100451492C CNB2007100626091A CN200710062609A CN100451492C CN 100451492 C CN100451492 C CN 100451492C CN B2007100626091 A CNB2007100626091 A CN B2007100626091A CN 200710062609 A CN200710062609 A CN 200710062609A CN 100451492 C CN100451492 C CN 100451492C
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- 239000002689 soil Substances 0.000 title claims abstract description 32
- 238000004378 air conditioning Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 13
- 238000005057 refrigeration Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 239000008236 heating water Substances 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 6
- 239000003643 water by type Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
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Abstract
The invention discloses a solar-energy soil ultra-critical carbon dioxide heat pump air-conditioning system. The invention comprises an ultra-critical carbon dioxide heat pump medium circulator, a solar-energy collector, an underground tube heat exchanger, and an indoor air-conditioning tube. The invention arranges heat exchange coil tube, evaporator/gas cooler in the heat accumulating box, via four-way valve and valves to connect them into one air-conditioning system. The invention can work in five modes as heating, refrigerating, heating water, heating-heating water, and refrigerating-heating water, to heat water, refrigerate and supply heat.
Description
Technical field
The invention belongs to solar energy utilization and air-conditioning technical scope, particularly a kind of solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system.Be that solar thermal collection system is combined with the soil source CO 2 trans-critical heat pump air-conditioning system specifically, by the cooperation of solar thermal collection system, heat transfer system of underground heat exchanger and heat pump type air conditioning system, form heat, the integrated system of refrigeration and hot water tri-generation.
Background technology
Carbon dioxide is comparatively desirable cold-producing medium as a kind of natural material, that its advantage is is nontoxic, do not fire, have zero odp value, greenhouse effects very low, cheap, need not reclaim, environment is not had unpredictalbe side effect etc.As a hot research field on refrigeration circle, the research work of the critical-cross carbon dioxide refrigerated air-conditioning system whole world launches rapidly at present, and many researchers predict that carbon dioxide will be a cold-producing medium of future generation.In the critical-cross carbon dioxide circulation, the exothermic process of carbon dioxide carries out under supercritical pressure, therefore there is bigger temperature to fall after rise, this process is particularly suitable for heating the hot water of family expenses, and the carbon dioxide heat-pump water heater is the heat-pump water heater that generally acknowledged at present each side is better than conventional working medium such as R22, R134a.State scholars' such as Austria, Norway, Japan this heat pump hot-water system annual COP value that studies show that can reach more than 3, and 90 ℃ of hot water still can be provided under-20 ℃ of environment, with electrical heating or gas heater specific energy consumption reduction by 75% mutually.
Along with people to improving constantly that comfortableness requires, the energy consumption that is used for air conditioning and domestic hot-water constantly increases.And in the prior art, generally separate with the hot water supply system for the air handling system of small-sized family formula, have oneself independently circuit system separately.And the cycle of operation of the apparatus of air conditioning all has very big intermittence, has so just caused the idle of equipment, and cost is increased.For solar thermal collection system independently, be subjected to inside even from weather serious, exist very big intermittence and unstability; Be far longer than cooling time for independently soil source heat pump system, especially northern area heating time, can cause the reduction of the soil moisture, thereby the coefficient of performance can descend constantly.
Summary of the invention
The purpose of this invention is to provide a kind of solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system.
The technical solution used in the present invention, described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system comprise solar thermal collection system, heat transfer system of underground heat exchanger, CO 2 trans-critical heat pump air-conditioning system and indoor fan coil system four parts.So-called critical-cross carbon dioxide circulation is meant that carbon dioxide absorbs heat in evaporimeter under the condition of subcritical pressure, and (rather than " condenser " in the conventional compression refrigerating system) heat release in cooler under the supercritical pressure condition.
Described solar thermal collection system is for to be connected to hot water storage tank 11 by heat collector inlet valve 13 and heat collector flowing water Valve 12, first water pump 10 respectively on the both sides of solar thermal collector 9;
Described soil source adopts heat transfer system of underground heat exchanger that low level heat energy is provided, the left side one tunnel, the 3rd valve 18 and the 4th valve 19 of first valve 16, second water pump 15, second valve 17, first evaporator 3 of leading up to of underground heat exchanger 14 connects into the loop, and the 9th valve 25 is connected in parallel on the two ends of the series loop of first valve 16, underground heat exchanger 14, the 4th valve 19; Second valve, 17 two ends are respectively by the 5th valve 21, the 6th valve 22 and the 8th valve 24, the 7th valve 23 connects with the water tank heat exchange coil in the hot water storage tank 11 20, water tank heat exchange coil 20 1 ends are by the 6th valve 22, the tenth valve 26 and the 11 valve 27, the node of the 15 valve 33 connects, water tank heat exchange coil 20 other ends are by the 7th valve 23, the 14 valve 32 is connected with the right one road of second evaporator 7 and the node of the 12 valve 30, and the 15 valve 33 is by interconnective the 3rd water pump 29, the 13 valve 31 is connected respectively to the right one road and the indoor fan coil system 28 of second evaporator 7; Indoor fan coil system 28 is connected with the 12 valve 30 again;
The compressor 1 of described CO 2 trans-critical heat pump air-conditioning system, first cross valve 2, fluid reservoir 8, internal exchanger 5 are connected into the loop, and the left side one tunnel and first cross valve 2 of the right one tunnel by first cross valve 2, first evaporator 3, second cross valve 4, second evaporator 7 connect into the loop; Wherein internal exchanger 5 is also formed loops with second cross valve 4, choke valve 6.
Described heat pump type air conditioning system adopts critical carbon dioxide as working medium, and the critical piece of heat pump type air conditioning system and pipe-line system should satisfy the requirement of withstand voltage of 15MPa.
The water loop system and the refrigeration system of described solar thermal collector can be separate.
Described hot water storage tank 11 inner water-tank heat exchange coils 20 both can be used as the hot water storage tank that the domestic hot-water is provided, and can be used as the low level heat energy that heat is provided again.
The described low level heat energy that heat is provided (if simple soil source as low level heat energy, temperature is greatly between 5-20 ℃) adopts independent hot water storage tank loop or soil source and hot water storage tank series loop.
The invention has the beneficial effects as follows solar thermal collection system, heat transfer system of underground heat exchanger, CO 2 trans-critical heat pump air-conditioning system are closely cooperated, heat, freeze, heat to adapt to the spring, summer, autumn and winter Various Seasonal+hot water, different demands such as refrigeration+hot water, hot water, reach facility compact, complete function, the requirement of energy efficient.
The present invention at first adopts this green working medium of carbon dioxide, and next adopts solar thermal collection system, has utilized reproducible solar energy, has the advantage of energy-conserving and environment-protective.Adopt soil as low level heat energy once more, improved the coefficient of performance, and " urban heat land effect " of having avoided employing air heat transmission equipment to bring.
Description of drawings
Fig. 1 is a solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system structural representation.
Among the figure: the 1-compressor; 2-first cross valve, 4-second cross valve; 3-first evaporator; 7-second evaporator; The 5-internal exchanger; The 6-choke valve; 12-heat collector flowing water Valve; 13-heat collector inlet valve; The 8-fluid reservoir; The 9-heat collector; 10-first water pump, 15-second water pump, 29-the 3rd water pump; The 11-hot water storage tank; The 14-underground heat exchanger; 20-water tank heat exchange coil; The 28-fan coil system; All the other are two-way valve.
The specific embodiment
This system by the cooperation of solar thermal collection system, underground buried tube system and heat pump type air conditioning system, can reach the three kinds of functions that heat water, heat and freeze under different weather conditions.Generally speaking, there are 5 kinds of mode of operations in this system, is respectively: (1) hot water operating mode; (2) heating condition; (3) heat+the hot water operating mode; (4) cooling condition; (5) refrigeration+hot water operating mode.Introduced respectively below:
(1) hot water operating mode
A) under the enough situation of intensity of illumination, need not open heat pump, solar energy heating water loop system by solar thermal collector 9, heat collector inlet valve 13, hot water storage tank 11, first water pump 10 and heat collector flowing water Valve 12 compositions, can directly reach predetermined temperature is the bathing temperature, and scope is greatly between 30-60 ℃.
B) when intensity of illumination is not enough, open compressor 1, the first cross valve 2 and second cross valve 4 and switch respectively, enter the heat pump heating mode.Low level heat energy adopts soil source, greatly between 5-20 ℃; Soil source is made up of underground heat exchanger 14, first valve 16, second water pump 15, second valve 17, first evaporator 3, the 3rd valve 18 and the 4th valve 19.Water tank heating system loop is made up of second evaporator 7, the 3rd water pump the 29, the 15 valve 33, the tenth valve 26, the 6th valve 22, water tank heat exchange coil 20, the 7th valve 23 and the 14 valve 32.
(2) heating condition
At first, start the heat pump heating mode.The loop, hot junction is made up of fan coil system the 28, the 12 valve 30, second evaporator 7, the 3rd water pump 29 and the 13 valve 31.And the low level heat energy loop is divided into following two kinds of situations:
A) when water tank temperature close with the soil source temperature, can alternately utilize solar heat-preservation water tank thermal source and soil heat source.Soil source is made up of underground heat exchanger 14, first valve 16, second water pump 15, second valve 17, first evaporator 3, the 3rd valve 18 and the 4th valve 19, and the hot water storage tank loop is made up of water tank heat exchange coil 20, the 7th valve 23, the 8th valve 24, first evaporator 3, the 3rd valve 18, the 9th valve 25, second water pump 15, the 5th valve 21 and the 6th valve 22.
B) be higher than the soil source temperature when water tank temperature, can use soil heat source and two kinds of low level heat energies of solar heat-preservation water tank simultaneously, thereby further improve the low level heat energy temperature.Mixing low temp thermal source loop is formed by burying ground heat exchanger 14, first 16 on valve, second water pump 15, the 5th valve 21, the 6th valve 22, water tank heat exchange coil 20, the 7th valve 23, the 8th valve 24, first evaporator 3, the 3rd valve 18 and the 4th valve 19.
(3) cooling condition
A) when cooling load less, can not start compressor, only utilize the cold of soil source, carry out the water route circulation at underground heat exchanger and fan coil system, closed circuit is made up of underground heat exchanger 14, first valve 16, second water pump 15, second valve 17, the 8th valve the 24, the 14 valve the 32, the 12 valve 30, fan coil system the 28, the 13 valve the 31, the 15 valve the 33, the 11 valve 27 and the 4th valve 19.
B) when cooling load is big, start compressor 1, the first cross valve 2 and second cross valve 4 and switch respectively, enter refrigeration mode.At this moment, low level heat energy is a fan coil system, and the loop is made up of fan coil system the 28, the 12 valve 30, second evaporator 7, the 3rd water pump 29 and the 13 valve 31.With heat absorption, heat-radiation loop is made up of underground heat exchanger 14, first valve 16, second water pump 15, second valve 17, first evaporator 3, the 3rd valve 18 and the 4th valve 19 by soil source in the hot junction.
(4) heat+the hot water operating mode
A) when solar thermal collection system can provide enough domestic hot-waters, can adopt independent hot water storage tank loop or soil source and hot water storage tank series loop with reference to low level heat energy in above-mentioned the 2nd kind of heating condition.
B) when solar thermal collection system can not provide enough domestic hot-waters, temporarily the heat supplying loop that fan coil system the 28, the 12 valve 30, second evaporator 7, pump 29 and valve 31 are formed switches to the water tank heating circuit that second evaporator 7, the 3rd water pump the 29, the 15 valve 33, the tenth valve 26, the 6th valve 22, water tank heat exchange coil 20, the 7th valve 23 and the 14 valve 32 are formed.When water tank temperature arrives assigned temperature, switch back again.
(5) refrigeration+hot water operating mode
A) when solar thermal collection system can provide enough domestic hot-waters, can be separate by the water loop system and the refrigeration system of solar thermal collector.Refrigeration system is with reference to above-mentioned the 3rd kind of cooling condition operation.
B) when solar thermal collection system can not provide enough domestic hot-waters, temporarily the heat-radiation loop that underground heat exchanger 14, first valve 16, second water pump 15, second valve 17, first evaporator 3, the 3rd valve 18 and the 4th valve 19 are formed switches to water tank heat exchange coil 20, the 7th valve 23, the 8th valve 24, first evaporator 3, the 3rd valve 18, the 9th valve 25, second water pump 15, the 5th valve 21 and the 6th valve 22 composition water tank heating circuits.
Claims (5)
1. solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system, described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system comprises solar thermal collection system, heat transfer system of underground heat exchanger, CO 2 trans-critical heat pump air-conditioning system and indoor fan coil system four parts, it is characterized in that
Described solar thermal collection system is for to be connected to hot water storage tank (11) by heat collector inlet valve (13) and heat collector flowing water Valve (12), first water pump (10) respectively on the both sides of solar thermal collector (9);
Described soil source adopts heat transfer system of underground heat exchanger that low level heat energy is provided, the left side one tunnel, the 3rd valve (18) and the 4th valve (19) of first valve (16), second water pump (15), second valve (17), first evaporator (3) of leading up to of underground heat exchanger (14) connects into the loop, and the 9th valve (25) is connected in parallel on the two ends of the series loop of first valve (16), underground heat exchanger (14), the 4th valve (19); Second valve (17) two ends are respectively by the 5th valve (21), the 6th valve (22) and the 8th valve (24), water tank heat exchange coil (20) in the same hot water storage tank of the 7th valve (23) (11) connects, water tank heat exchange coil (20) one ends are by the 6th valve (22), the tenth valve (26) and the 11 valve (27), the node of the 15 valve (33) connects, water tank heat exchange coil (20) other end is by the 7th valve (23), the 14 valve (32) is connected with the right one road of second evaporator (7) and the node of the 12 valve (30), and the 15 valve (33) is by interconnective the 3rd water pump (29), the 13 valve (31) is connected respectively to the right one road and the indoor fan coil system (28) of second evaporator (7); Indoor fan coil system (28) is connected with the 12 valve (30) again;
The compressor of described CO 2 trans-critical heat pump air-conditioning system (1), first cross valve (2), fluid reservoir (8), internal exchanger (5) are connected into the loop, and the left side one tunnel and first cross valve (2) of the right one tunnel by first cross valve (2), first evaporator (3), second cross valve (4), second evaporator (7) connect into the loop; Wherein internal exchanger (5) is also formed the loop with second cross valve (4), choke valve (6).
2. according to the described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system of claim 1, it is characterized in that described CO 2 trans-critical heat pump air-conditioning system adopts critical carbon dioxide as working medium.
3. according to the described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system of claim 1, it is characterized in that the water loop system and the refrigeration system of described solar thermal collector can be separate.
4. according to the described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system of claim 1, it is characterized in that, described hot water storage tank (11) inner water-tank heat exchange coil (20) both can be used as the hot water storage tank that the domestic hot-water is provided, and can be used as the low level heat energy that heat is provided again.
5. according to the described solar-assisted soil source CO 2 trans-critical heat pump integrated air-conditioning system of claim 4, it is characterized in that the described low level heat energy of heat that provides adopts independent hot water storage tank loop or soil source and hot water storage tank series loop.
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| CNB2007100626091A CN100451492C (en) | 2007-01-11 | 2007-01-11 | Integrated air-conditioning system of solar-assisted soil source CO2 trans-critical heat pump |
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| CNB2007100626091A CN100451492C (en) | 2007-01-11 | 2007-01-11 | Integrated air-conditioning system of solar-assisted soil source CO2 trans-critical heat pump |
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| CN100451492C true CN100451492C (en) | 2009-01-14 |
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