1 Study on heat transfer and mass transfer in soil
At the bottom of the overall system is the secondary subsystem of the buried heat exchanger. In this system, the main concern is the heat exchange process between the buried heat exchanger and the surrounding soil. Since the soil is a multiphase dispersion consisting of a solid soil skeleton, liquid and gaseous water, and air, the simple composite unsteady heat conduction used in most of the current researches attribute the transport of water and air to The added value of a thermal conductivity coefficient to describe the thermal mass coupling in the soil obviously brings about a large error. Corresponding results, the size of the buried heat exchanger of the soil source heat pump is too large, and the initial investment of the heat pump device is increased ( Buried heat exchangers typically cost 20% to 30% of the total cost of a heat pump system and cannot compete with conventional air conditioning systems.
Therefore, the urgent solution is to describe the heat exchange process between the buried heat exchanger and the soil by using a more complete mathematical model, and comprehensively consider the heat transfer and mass transfer process. The porous media hydrodynamics approach may be a powerful tool. Some researchers have proposed to use irreversible thermodynamics to study, and it is also a new and feasible method. Other researchers have proposed using fractal methods to study the thermal conductivity in soil, which may simplify the mathematical model and make the research less difficult.
Another purpose of studying the heat and mass transfer process in soil is to find a new type of filling material for heat transfer enhancement. Researchers in foreign countries have conducted research in this area and have reported it. Of course, the ultimate goal is the same, that is, to minimize the initial investment cost of the soil source heat pump buried heat exchanger, but no similar research reports have been seen in China.
2 Study on the coupling process with heat pump device
The purpose of studying the coupling process with the heat pump device is to optimize the performance of the heat pump device subsystem. Due to the use of soil as a heat source, whether in winter or summer, the operating conditions of the heat pump system (the operating point of the outdoor side heat exchanger) are different from the working points of the conventional air heat pump or the general water source heat pump, thus causing the whole The operating characteristics of the heat pump system vary. Specifically, in the temperature of the new outdoor side heat exchange fluid, how to configure the corresponding evaporator, condenser, compressor and even the entire system components, so that the heat cycle performance of the heat pump is optimal, and the soil source heat pump is maximized. Energy saving potential. Therefore, it is necessary to adopt the thermodynamic method of the refrigeration system.
3 Economic analysis of the annual energy consumption of the system of soil source heat pump
From the thermal system diagram of the soil source heat pump, it can be seen that the third level of the problem to be studied is the annual energy consumption analysis of the entire heat pump system. For the case where air conditioning is required throughout the year, the conclusion that the soil source heat pump is superior should be based on the results of the annual energy consumption analysis.
This is especially important when determining the solution for a soil source heat pump. For different meteorological conditions and different building functional requirements, the heating and cooling load of the building in winter and summer may be different. Winter heating should be given priority. The shortage of summer cooling load is supplemented by traditional air conditioning systems (such as the installation of cooling towers). Is it based on the summer cooling load and the auxiliary heat source mode in winter? Based on the annual energy consumption analysis, the initial investment and operating costs of the system should be fully considered, and the investment recovery period should be used as the basis for judgment.
Therefore, based on the understanding and understanding of the heat transfer process of the underground heat exchanger and the dynamic thermal characteristics of the heat pump system, combined with the annual dynamic load of the building, the superiority of the soil source heat pump can be achieved. It can be fully utilized to achieve energy conservation and environmental protection.
1. Application:
Sanitary diaphragm valves are widely used in the process of producing wine, dairy, and beverage, food industry as well as in pharmaceutical field, and play the role as control box switch in order to control the pipeline fluid.
2. Working principle:
Diaphragm valves is closed in a normal state, the diaphragm close to the body cavity, closed pipe flow leads to the path, When the diaphragm valve needs to clean western open, just need to manual rotating the hand wheel or drive control actuator to stimulate the stem upward movement if the spherical diaphragm followed up bending.
So that the valve to form a conduction state, shell realization cleaning and the purpose to open. The diaphragm to the lower part of the body cavity and the upper valve cover cavity separated from the stem at the upper part of the diaphragm, spool and other parts from the corrosive media, eliminating the need to packing seal structure, and will not produce the media leak. Optimized body design, so that the cleaning solution completely excretion. There is no retention.
3. Material:
Steel parts: Stainless steel 304, stainless steel 316L.
Sealing: EPDM+RTFE
Standard: DIN, 3A, ISO,SMS,RJT
Control mode:Manual Type & Pneumatic Type
Size:DN10-DN100,other size can be customized
Available connection:Clamp/weld/thread/special connection
FAQ:
1.Are you a trader or manufactory?
We are a manufactory (Own Forging workshop and CNC machining workshop )
2.Can your products reach to FDA , CE and 3A requirements?
Yes, all of our material can reach to the requirements of FDA, ISO and 3A Certificate).
3.We can supply:
Sanitary Butterfly Valve, Sanitary Check Valve and Diaphragm Valves, as well as Various Tank Accessories: Sight Glass, Strainers/Filter, Cleaning Ball, And other Pipe Fittings, (Pipe Unions: SMS, DIN, IDF, RJT, 3A,DS; Fittings: Ferrule,Elbow, Tee, Reducer and all other Non-standrad fittings), each products are tested well by our strictly Quality Control System, and we also have excellent service to support you and promote your business.
4.Lead Time:
For large quantity, as usual, it can be sent out within 20-40 days.
Small parcel will be dispatched by DHL, FedEx, UPS OR TNT Courier.
Big cargo will be delivered by Air freight or By Sea.
5.Our Service:
About payment:
Payment methods: L/C, T/ T, Paypal,Western Union
6.About samples:
We can provide samples production and service. Usually 2 to 5 days, the sample can be sent to your hands. We will choose the shipping way as you required: By sea, by air or by express. Any question about samples, please contact us.
7.For OEM products:
We will finish the production within 20-40 days after payment has been confirmed.
About delivery and shipping:
We will choose the delivery way as you required: By sea, by air, by express ect. Save your cost is our mission.
8.Warranty:
Any question or problem will be respond within 12 hours.
9.Lifetime service:
Any problem happened to our product, we will do our best to help client to solve it, spare parts will be half price in lifetime.
10.Problem solve:
If you can't solve the problem in your local, please delivery the product to us, we will repair it and then back to you.
11.Quality control:
All the products are calibrated with real working condition, and tested before shipping as qualified product.
12.Purpose:Attitude is everything.
Diaphragm Reducing Valve,Diaphragm Regulating Valve,Stainless Steel Valve,Diaphragm Control Valve
Wenzhou Qili Fluid Equipment Co., Ltd. , http://www.qlssvalve.com