【 Weak current College 】 direct-fired LIBR absorption chiller room design---Power By 【 China power house network 】

Direct-fired LIBR absorption chiller (hereinafter chiller) applies to the following areas:

1. user area is rich in oil, gas resources;

2. local environmental protection requirements do not allow the use of coal-fired boiler and electric tension or expensive tariffs;

3. oil and gas can be used, should carefully weigh the use of, or the success of fuel gas. General priority using city gas, city gas supply if not, you should consider using a light oil. Heavy oil with a sulphur content higher, generally should not be used.

Been fired LIBR absorption chiller models selection principle

1. choose the burning machine models

Chiller from its use of energy can be divided into fuel oil-, gas-and oil and gas on the dual-purpose type; from functionality can be divided into three-(with refrigeration, heating and sanitary hot water three functions), air conditioning (with refrigeration, heating function) and single cooling (with cooling function). Single cooling two cheaper than before, three-and-price close to the air conditioning. Selection should be based on the user's requirements for water supply parameters; it should also be an economic comparison, to reduce the room for a time investment.

2. determination of load

Determine chiller for cooling (heat) load, except in the calculation of air conditioning load, increasing the unit itself and water system in the cold (hot) loss (usually lo% ~ 15%), consideration should be given to the cold (hot) water and cooling water dirt factors, on the amount of cold (heat). Unit in the refrigeration system of hot water at the same time, the cooling capacity corresponding lower, unless the increase high-voltage generator, this factor should also be considered. Different cold (hot) load, you should choose the burning machine.
General direct machine rated heating capacity is its rated cooling capacity of 80 percent. But they can according to user's requirements, select the quantityof heat is greater than or equal to the cooling capacity of special models. The heating capacity chiller is the heating of heat and hot water heat health, or either (both of which can be individually rated heating capacity).

3, the number of

General use 2-4 chiller, small and medium-sized project selection 2, a large selection of 3, 4 large selection. Unit between mutual as spare and rotate. From easy maintenance management perspective, try to use the same model, same specifications unit, from the standpoint of energy and, if necessary, you can also choose different models and different load unit combination.

4. determination of working pressure

Chiller work pressure, directly affect the cost of its cost and system safety and reliability, should be based on appropriate air-conditioning system, heating and water system, hot water system in the unit set the elevation at the pressure of work, to determine the chiller evaporator, condenser and water heaters work pressure. Homemade chiller of evaporator, condenser and water heater tube bundles of working pressure is 0, 8MPa (standard type) to meet the General requirements of the building, design, priority should be to reduce equipment costs. Located at the top or bottom of super high-rise building basement or absorption unit, its pressure is often more than 0, 80MPa. If you consider that the use of air conditioning water system vertical not partition scheme for safe, reliable and economically reasonable, you can special order to manufacturer selection pressure 0.81 — 1.6MPa's enhanced unit. Otherwise, should take water system partition, decompression measures to reduce the pressure on the bottom of the unit, so that less expensive ordinary unit to apply.

5. determination of fuel

Choose what kind of fuel, according to the local economy of fuel supply situation and identify the technical results of the comparison. When there are reliable sources (city gas or natural gas, etc.), youshould first use gas; when only oil (light or heavy fuel oil), you should first consider the use of light gas oil (diesel). A light oil system, heavy oil system simple and convenient to run management, eliminating the need for heating oil. Of course, if you have a cheap source of heavy fuel oil, should also be taken into account. If the user to predict gas does not completely meet your needs (daily gas peak cause gas shortage or years less than a season volume), you can select the oil and gas dual-fuel dual-purpose type units, in order to meet the different stages of the supply of the particular circumstances of different fuels. Dual-fuel units because it has a dual function, expensive, users should be on the increase and decrease operating costs, reasonable comparison.

2 architectural design of direct-fired machine room

Since chiller for negative pressure operation equipment, its room settings can be set according to the architectural characteristics of flexible. And since chiller to burn oil and gas, natural gas, etc., so the engine room security comparison strict, must meet the national standard specifications for the design of the boiler room, the senior civil building design fire protection standard, the architectural design fire protection standard, the town gas design code, and other requirements.

1, room location

Room location should be set at the desired place of cold, cold load centres in General should consider building the first layer to save covers.

Basement, ground floor, floor, roof can be set in the engine room, but fuelled with liquefied petroleum gas (LPG) and density than air greater gas should not be set in the semi-underground and ground floor of a building or structure. For high-rise building, computer room in the basement or ground floor yishe. Located in the basement, ventilation and drainage more difficult; for super high-rise building, consider room located in the floor or roof. Set up, will bring a rangeof issues, such as water pump room noise and vibration, the crew hoisting, maintenance more difficult, the equipment load on structural design requirements are higher, at present, the lack of experience, must be taken seriously.

If direct combustion in the engine room must be located in the basement, you should think about ventilation and drainage problems, you should also consider lifting and hoisting plan population and reserved; if located in the floor and the roof, you should consider water system design and structural load-bearing and lifting scheme, etc.

Cooling water, cold water pressure too high occasions (e.g. more than o.8MPa), consider room located on the floor or roof. Noise and vibration due to the pump. Water pump room and the host application wall separates the House.

Large and medium-sized cooling machine room should be set first, control room, garage and toilet facilities, or in combination with other room (such as water pumping station, the air conditioning room, etc.). Conditions should be set.

2, room size is OK

First of all should meet the requirements of the unit itself, should stay out of maintenance space, the space around the basic unit of not less than: above about side 1.2m, as 1.5m; the other side as before and after the end of the o.8m 1.5m at one end and leave a washing pipe space (equivalent to the body length in order to facilitate the cleaning of heat exchanger tube). Washing pipe space can take advantage of doors, Windows. Setup 2 or more units when maintenance space can share; second, you should also consider pumping stations, water treatment equipment, power distribution control room, rest room and other subsidiary room dimensions. Located in the basement of the House, if too many over the pipeline, for easy installation, reduced pipe fighting, part of the pipeline underneath the unit. At this time, the room storey you should also consider unit below the overhead piping space (normally clear height of not less than 0.5m) height.