Study on off design characteristics of the hottest

Research on the off design characteristics of water source heat pump units

1. Overview at present, because water source heat pump system is a new energy-saving, efficient and environmental protection system that can both heat and cool using the earth's surface or shallow water sources (such as groundwater, rivers and lakes) and artificial renewable water sources (industrial wastewater, reclaimed water, geothermal tail water, etc.), it is increasingly being tested by construction institutions, design units, real estate developers Attention and application of manufacturers and the public. The characteristic of water source heat pump unit is that the cold and heat source medium and working temperature range change greatly, so it is more necessary to study the off design characteristics of water source heat pump unit. This paper attempts to study the variable condition characteristics of the water source heat pump unit, through theoretical analysis and scientific calculation, theoretically establish the variable condition model of the water source heat pump unit, and analyze the variable condition characteristics of the unit, which has a certain reference and practical value for the future research on other aspects such as the optimal design of the water source heat pump unit and its air-conditioning system. This is a performance value that is highly responsible to the country and the people for the country. Here, the research on the off design characteristics of water source heat pump units involves the main components: compressor, condenser and evaporator. As the internal volume of the throttling device of the unit is relatively small compared with the whole water source heat pump unit, the actual transaction price of the throttling device is slightly lower than the market quotation, and the impact on the unit is very small and can be ignored. 2. Study on the off design characteristics of the compressor of water source heat pump unit; first of all, we need to establish its mathematical model. The form of the compressor mathematical model of water source heat pump unit depends not only on the nature of the research object, but also on the nature of the problem to be solved. The purpose of this paper is to select the appropriate compressor, which is conducive to the optimal design of the water source heat pump unit. Therefore, when establishing its mathematical model, it is not required to accurately reflect the internal working process of the compressor of the unit, but to focus on reflecting the parameters that affect the performance of the water source heat pump unit. The purpose is to select the appropriate compressor to make it match well with other components of the unit. In order to grasp the main contradiction, we first analyze the theoretical cycle of the compressor of the water source heat pump unit. 2.1 theoretical off working condition characteristics the theoretical cycle diagram of the compressor of the water source heat pump unit is shown in Figure 1. When analyzing the theoretical off working condition characteristics of the compressor of water source heat pump unit, with reference to Literature (3), the following assumptions can be made first: (1) the variation law of vaporization latent heat with temperature: (1) the formula represents the critical temperature of the working medium, which is a constant depending on the working medium. (2) The specific heat of working fluid at constant pressure is constant, and the heating process line of liquid at constant pressure coincides with that of saturated liquid. (3) The enthalpy of saturated liquid corresponding to the evaporation temperature of the working medium is taken as the calculation reference point of the enthalpy value of the working medium. (4) When solving the power consumption of water source heat pump unit, in order to simplify the problem analysis, the original exothermic process 2-4 of working medium can be replaced by process line 6-4. After making the above assumptions and comparing with figure 1, the power consumption of the water source heat pump unit can be derived from the analysis that the polyethylene material has good chemical stability: (2) in the above formula, it is the condensation temperature, the evaporation temperature, the liquid constant pressure specific heat of the working medium, and the refrigerant flow. Under the heating condition, the heat release capacity in the condenser of the water source heat pump unit is: (3) under the cooling condition, the cooling capacity of the water source heat pump unit is: (4) since the cooling and heating conditions of the water source heat pump unit are not the same cycle, it is necessary to clarify the above formula:. If,, is taken, the theoretical performance coefficient of the water source heat pump unit: (5) if supercooling and dry compression are considered, the approximate value is