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机：它只能交替地以制冷/采暖方式进行运转，而不能同时具备两种功能；2)同时制冷与采暖型：它在工作时可以同时完成制冷与采暖循环; 3)同时制冷、采暖与供应生活热水型：它的优点是设备利用率高，可以节省机房的面积。
Direct combustion absorption air conditioning unit in natural gas, liquefied petroleum gas, fuel for energy, combustion within the high voltage generator, heat, high temperature flue gas as the heating source, using the basic principle of absorption refrigeration cycle, for making hot and cold water, for summer cooling and winter heating. It combines the advantages of the absorption chiller and boiler, have the function of the multi-usage. Direct units have used by units and different two kinds of forms: single cooler unit with functions of cooling, only in hot weather to provide chilled water for air conditioning system; Different has the dual function of cooling and heating, can provide chilled water, can also provide heat sources and hot water. According to the different means of heating cycle, and different can be divided into the following several types: 1) the refrigeration, heating machine: it can only be alternately operating on the basis of refrigeration/heating, and can't have two functions at the same time; 2) type refrigeration and heating at the same time, it can be done at the same time in work cycle refrigeration and heating; 3) cooling supply, heating and living hot
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water operated at the same time, it has the advantage of high utilization rate of equipment, can save the area of the room. 2.3 冷热电三联产系统
2.3 cold hot electricity cogeneration system
冷热电三联产系统是一种对燃气进行梯级利用的系统，可以有效的提高一次能源利用率。为了有效利用燃气，不仅要提高耗能设备效率，尽量减少排放热损失，而且要使燃气产生的能量由高温到低温实行多阶段多次利用，也就是按能量品位的高低，安排好功、热和物料热力学能的各种能量之间的合理配合，实现不同形式、不同品位能量的梯级利用，以获得整个系统能量综合利用最佳效果。
Cold and hot electricity cogeneration system is a system of cascade utilization of gas, can effectively improve the utilization rate of energy at a time. In order to effectively use of gas, not only to improve the efficiency of energy consumption equipment, heat loss, decrease as far as possible emissions and to generate energy from high temperature to low temperature gas for multi-stage repeatedly used, namely according to the energy grade of the high and low, arranged work, heat and material thermodynamics can cooperate between various energy reasonable, implement different forms, different grade energy cascade utilization, in order to obtain the best effect of comprehensive utilization of energy of the system. 冷热电三联产系统是由一种一次能源连续产生两种以上的二次能源
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的系统，燃气燃烧把化学能转化为热能，高品位的热能用来发电(燃料电池冷热电三联产系统直接把天然气的化学能转化为电能)，低品位的热能用于供热或者为吸收式、吸附式制冷系统提供驱动热源，从而实现对燃气化学能的多级多次利用。
Cold hot electricity cogeneration system is composed of a primary energy continuously produce two or more of the two energy system, fuel gas combustion to convert chemical energy into heat energy, high grade heat energy used to power generation, fuel cell cold hot electricity cogeneration systems directly convert the chemical energy of gas for electricity), low grade heat energy used for heating or for absorption and adsorption refrigeration system driving heat source, so as to realize multi-stage repeatedly used for gas chemical energy.
根据采用的原动机不同，冷热电联产系统分为两类：
Depending on the prime mover, cold hot electricity co-generation system is divided into two categories: 1)以燃气机为原动机的系统
1) gas machine as the prime mover system
燃气机与柴油机类似，同属内燃机，为往复运动机械，再将往复运动转变为回转运动, 驱动发电机组。发电效率为（20～35）%，热电综合利用效率为80%。排热回收形态主要为（400～600）℃的排气与（85～90）℃的热水，可用于采暖、供热水与制冷。发电量规模一般
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为（15～1000）kW的中小型容量，日本已有容量（15～300）kW机组型的产品[1]。
Gas machine similar to diesel, belong to the internal combustion engine, for reciprocation machinery, then reciprocating motion into rotary motion, drive the generator. Power generation efficiency is (20 ~ 35) %, comprehensive utilization of thermoelectric efficiency of 80%. Main exhaust heat recovery form for exhaust (400 ~ 600 ℃) and (85 ~ 90 ℃ of hot water, can be used for water heating, heating and refrigeration. Output size is commonly (15 ~ 1000 kW) of small and medium capacity, Japan's existing capacity type (15 ~ 300 kW units products [1].
2)以燃气轮机为原动机的系统
2) gas turbine as the prime mover system
可直接传递回转能带动发电机组，发电效率为（20～40）%，热电综合利用效率为80%.不用冷却水，排热回收形态主要是排气，排气温度（400～550）℃，排气经废热锅炉产生蒸汽或热水，用于采暖、供热水与制冷，也可将排气直接用于吸收式制冷机组制冷。发电规模为（1000～3000）kW的大型容量。但随着微型燃气轮机的发展，小容量的发电机组得到发展。日本已生产以城市煤气为能源的微气体发电机组，最小容量为290kW[1]。
Can directly turn to drive the generator set, power efficiency (20 ~ 40) %, comprehensive utilization of thermoelectric efficiency was
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80%. No cooling water, mainly is the exhaust heat recovery form, exhaust temperature (400 ~ 550 ℃), exhaust gas after waste heat boiler to produce steam or hot water, and used for heating water, heating and refrigeration, and exhaust can be directly used for absorption refrigeration refrigeration unit. For wind farm scale, large capacity (1000 ~ 3000 kW). But with the development of the miniature gas turbine, small capacity of the generating set was developed. Japan has been in the production of city gas as the energy micro gas generating set, the minimum capacity of 290 kw [1].
2.4 天然气除湿空调系统
2.4 gas desiccant air conditioning system
普通的空调器的除湿功能只有在被冷却的房间温度低于露点时，才具有一定的除湿能力，但也是有限的，其调节能力较差，因此需要专门具有除湿功能的空调系统[2]。目前，以天然气作为驱动能源的除湿空调系统主要有如下两种形式：
Ordinary dehumidification function of air conditioner only when in the cooling room temperature below the dew point, only has a certain dehumidification capacity, but it is also limited, its adjustment ability is poorer, so need special dehumidification function of air conditioning system [2]. At present, the main energy with natural gas as a driving desiccant air conditioning system has