CN101008537A - 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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- CN101008537A CN101008537A CN 200710062609 CN200710062609A CN101008537A CN 101008537 A CN101008537 A CN 101008537A CN 200710062609 CN200710062609 CN 200710062609 CN 200710062609 A CN200710062609 A CN 200710062609A CN 101008537 A CN101008537 A CN 101008537A
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- 239000002689 soil Substances 0.000 title claims abstract description 31
- 238000004378 air conditioning Methods 0.000 title claims abstract description 29
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound 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- 238000005057 refrigeration Methods 0.000 claims description 10
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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 room conditioning pipe-line 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 that solar thermal collector 9 both sides are connected to hot water storage tank 11 by valve 13 and valve 12, water pump 10 respectively; Open compressor 1, cross valve 2 and 4 switches respectively, enters the heat pump heating mode.
Described soil source circuit system adopts heat transfer system of underground heat exchanger that low level heat energy is provided, the underground buried tube pipe laying depth is generally more than 5 meters, the left side one tunnel, valve 18 and the valve 19 of valve 16, pump 15, valve 17, first evaporator 3 of leading up to of underground heat exchanger 14 connects into the loop, and valve 25 is connected in parallel on the two ends of the series loop of valve 16, underground heat exchanger 14, valve 19; Valve 17 two ends are connected with the water tank heat exchange coil 20 in the hot water storage tank 11 by valve 21, valve 22 and valve 24, valve 23 respectively.Water tank heat exchange coil 20 1 ends are connected with the node of valve 27, valve 33 by valve 22, valve 26, water tank heat exchange coil 20 other ends are connected with the right one road of second evaporator 7 and the node of valve 30 by valve 23, valve 32, and valve 33 is connected respectively to the right one road and the indoor fan coil system 28 of second evaporator 7 by interconnective pump 29, valve 31; Indoor fan coil system 28 is connected with valve 30 again;
Described CO 2 trans-critical heat pump air-conditioning system is connected into the loop by compressor 1, cross valve 2, fluid reservoir 4, internal exchanger 5, and the left side one tunnel and the cross valve 2 of the right one tunnel by cross valve 2, first evaporator 3, cross valve 4, second evaporator 7 connect into the loop; Wherein internal exchanger 5 also and cross valve 4, valve 6 composition loops.
Described heat pump type air conditioning system adopts critical carbon dioxide as working medium, and corresponding critical piece 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, the 4-cross valve; 3-first evaporator; 7-second evaporator; The 5-internal exchanger; The 6-choke valve; The 8-fluid reservoir; The 9-heat collector; 10,15, the 29-water pump; The 11-hot water storage tank; The 14-underground heat exchanger; 20-water tank heat exchange coil; 28 fan coil systems; 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, by the solar energy heating water loop system that solar thermal collector 9, valve 13, hot water storage tank, water pump 10 and valve 12 are formed, 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, cross valve 2 and 4 switches respectively, enters the heat pump heating mode.Low level heat energy adopts soil source, greatly between 5-20 ℃; Circuit system is made up of underground heat exchanger 14, valve 16, pump 15, valve 17, evaporimeter 3, valve 18 and valve 19.Water tank heating system loop is made up of cooler 7, pump 29, valve 33, valve 26, valve 22, water tank heat exchange coil 20, valve 23 and valve 32.
(2) heating condition
At first, start the heat pump heating mode.The loop, hot junction is made up of fan coil system 28, valve 30, cooler 7, pump 29 and 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.The soil source loop is made up of underground heat exchanger 14, valve 16, pump 15, valve 17, evaporimeter 3, valve 18 and valve 19, and the hot water storage tank loop is made up of water tank heat exchange coil 20, valve 23, valve 24, evaporimeter 3, valve 18, valve 25, pump 15, valve 21 and valve 22.
B) be higher than the soil source temperature when water tank temperature, soil heat source and two kinds of low level heat energies of solar heat-preservation water tank simultaneously, thus further improve the low level heat energy temperature.Mixing low temp thermal source loop is formed by burying ground heat exchanger 14, valve 16, pump 15, valve 21, valve 22, water tank heat exchange coil 20, valve 23, valve 24, evaporimeter 3, valve 18 and 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, valve 16, pump 15, valve 17, valve 24, valve 32, valve 30, fan coil system 28, valve 31, valve 33, valve 27 and valve 19.
B) when cooling load is big, start compressor, cross valve 2 and 4 switches respectively, enters refrigeration mode.At this moment, low level heat energy is a fan coil system, and the loop is made up of fan coil system 28, valve 30, evaporimeter 7, pump 29 and valve 31.With heat absorption, heat-radiation loop is made up of underground heat exchanger 14, valve 16, pump 15, valve 17, cooler 3, valve 18 and 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 28, valve 30, evaporimeter 7, pump 29 and valve 31 are formed switches to the water tank heating circuit that cooler 7, pump 29, valve 33, valve 26, valve 22, water tank heat exchange coil 20, valve 23 and valve 32 are formed.When water tank temperature arrives assigned temperature, switching back.
(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, the heat-radiation loop that temporarily will bury ground heat exchanger 14, valve 16, pump 15, valve 17, evaporimeter 3, valve 18 and valve 19 compositions switches to water tank heat exchange coil 20, valve 23, valve 24, evaporimeter 3, valve 18, valve 25, pump 15, valve 21 and valve 22 and forms the 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 room conditioning pipe-line system four parts, it is characterized in that
Described solar thermal collection system on the both sides of solar thermal collector (9) respectively by valve (13) and valve (12, water pump (10) is connected to hot water storage tank (11);
Described soil source circuit system adopts heat transfer system of underground heat exchanger that low level heat energy is provided, the left side one tunnel, valve (18) and the valve (19) of valve (16), pump (15), valve (17), first evaporator (3) of leading up to of underground heat exchanger (14) connects into the loop, and valve (25) is connected in parallel on the two ends of the series loop of valve (16), underground heat exchanger (14), valve (19); Valve (17) two ends are respectively by valve (21), valve (22 and valve (24), water tank heat exchange coil (20) in the same hot water storage tank of valve (23) (11) connects, water tank heat exchange coil (20) one ends are by valve (22), valve (26) and valve (27), the node of valve (33) connects, water tank heat exchange coil (20) other end is by valve (23), valve (32) is connected with the right one road of second evaporator (7) and the node of valve (30), and valve (33) is by interconnective pump (29), 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 valve (30) again;
The compressor of described CO 2 trans-critical heat pump air-conditioning system (1), cross valve (2), fluid reservoir (4), internal exchanger (5) are connected into the loop, open the right one tunnel, the cross valve (4) of cross valve (2), first evaporator (3), the left side one tunnel and the cross valve (2) of second evaporator (7) connects into the loop; Wherein internal exchanger (5) also and cross valve (4), valve (6) composition loop.
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, and corresponding critical piece and pipe-line system should satisfy the requirement of withstand voltage of 15MPa.
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 middle 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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