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"cooling And Heating," Air Source Heat Pump System And Analysis by big tree
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"cooling And Heating," Air Source Heat Pump System And Analysis by BIG TREE
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| Article Posted: 09/24/2010 |
| Article Views: 15 |
| Articles Written: 1033 - MORE ARTICLES FROM THIS AUTHOR |
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"cooling And Heating," Air Source Heat Pump System And Analysis |
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Figure 2 Schematic of Heat Recovery Unit
Refrigerant circulation loop: compressor 1, four-way valve connecting the exhaust port in turn 4, the air-side heat exchanger 5, one-way valve 7, high pressure liquid receiver 8, 9, thermal expansion valve, check valve 11, water side heat exchanger 16, four-way valve 4, gas-liquid separator 14, and then return to the compressor 1, the suction mouth, the one-way valve 11 one-way valve 7 export and the export of one-way valve 12 between the thermal expansion valve 9 the temperature of the package 13 installed in the four-way valve 4 and gas-liquid separator 14, the connection between the pipeline;
1.2.2 Characteristics of the Heat Recovery Unit
(1) air conditioning unit in the compressor exhaust port and four-way valve between the entrance to set up a heat recovery heat exchanger, the compressor exhaust heat recovery heat exchanger with the refrigerant inside the entrance channel connected to the heat recovery heat exchanger exit and the entrance of four-way valve connected to the respective import and export of domestic hot water channel into the water with hot water and heat recovery heat exchanger connected to the entrance of the water channel.
(2) in the air conditioning compressor unit and the exhaust heat recovery heat exchanger port settings between the electromagnetic three-way valve, the electromagnetic three-way valve in the inlet and outlet compressor connected to the other two exits and four-way valve in the inlet and the refrigerant heat recovery heat exchanger connected to the entrance channel, heat recovery heat exchanger refrigerant channel of exports and four-way valve connected to the entrance.
(3) programs to address the traditional hot water pipe is easy scaling of the problem, in addition to additional descaling device in hot water piping, the exhaust pipe and also the compressor heat recovery heat exchanger set between the electromagnetic three-way valve, three-way valve conversion by electromagnetic flow of the refrigerant temperature in the hot water heating device without running water, so high temperature gaseous refrigerant refrigerant heat recovery without directly into the electromagnetic four-way bypass valve, to avoid the high temperature gaseous refrigerant within the heat recovery heat exchanger to heat water pipes caused by water fouling.
2 Components 2.1 Compressor The heat recovery unit compressor selection of cold hot water unit with the same general style, that is based on various models of the compressor cooling capacity and evaporator temperature, condensing temperature curve (characteristic curve) generally provided by the manufacturer . Absence of performance curve as a reference, according to samples provided by the compressor gas transmission capacity selection.
Example earlier in this article that the recoverable heat can reach 17% in theory, but in actual operation, because one side is the gas heat transfer, thermal resistance, so even with high heat transfer efficiency of plate heat exchanger, may failed to achieve so much. To design a 20kW of heat recovery unit, for example, an instance of the general engineering, hotel required cooling capacity for hot water heating is about 20-30% [5], can be appropriately selected, larger capacity compressor, which evaporating temperature and condensing temperature constant, cooling capacity increase of 1.2-1.3 times the design load to meet the hot water for heat. In this article, the design itself, or to ensure the cooling effect is the prerequisite for recovery of waste heat as possible. Greater demand in the winter under water, also need to use auxiliary heat source.
Related Reading: Water loop heat pump system with variable amount of water running and related issues
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