1、 INCH - POUND MIL-PRF-32424 13 September, 2012 PERFORMANCE SPECIFICATION HEATER, SPACE - CONVECTIVE, SELF-POWERED, LIQUID FUEL, SHC 90K This performance documentation is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This documentation covers the p
2、erformance and acceptance requirements for a self-powered, liquid fuel burning, convective space heater 1.2 Classification. Space Heater Convective (SHC 90K), 90,000 BTU/hr Comments, suggestions, or questions on this document should be addressed to U.S. Army Soldier Systems Center, Natick, MA 01760-
3、5018 or emailed to Joseph.A.Mackoul.civMail.Mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil . AMSC N/A FSC 4520 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
4、thout license from IHS-,-,-MIL-PRF-32424 2 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional informatio
5、n or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. The following d
6、ocuments form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) cited in the solicitation. Unless otherwise specified, the issues of
7、 documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). MIL-STD-810 Environmental Test Methods and Engineering Guidelines (Copies of these documents are available online at https:/assist.dla.mil or from the Standardization Document Order Desk, 700 Rob
8、bins Avenue, Building 4D, Philadelphia, PA 19111-5094) 2.3 Non-Government Publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the Department o
9、f Defense Index of Specifications and Standards (DoDISS) cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY OF HEATING, REFRIGERATION AND AIR CONDITIONING ENGINE
10、ERS (ASHRAE) ASHRAE 51 Laboratory Methods of Testing Fans for Rating Purposes (Application for copies should be addressed to American Society of Heating, Refrigeration and Air Conditioning Engineers, 1791 Tullie Circle N.E., Atlanta, GA 30329. The web address is http:/www.ashrae.org .) AMERICAN SOCI
11、ETY FOR TESTING AND MATERIALS (ASTM) ASTM D2156 Standard Test Method for Smoke Density in Flue Gases from Burning Distillate Fuels (Application for copies should be addressed to American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959. The web address is http
12、:/www.astm.org .) 2.4 Order of Precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obta
13、ined. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32424 3 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to a first article inspection in accordance with 4.1.1. 3.2 Conformance and end item examin
14、ation. Items furnished under this specification shall be subjected to conformance inspection and end item examination in accordance with 4.1.2 and 4.1.3. 3.3 Operating requirements. The heater shall satisfy the following user-oriented requirements. 3.3.1 Description. The SHC 90K shall be a 90,000 BT
15、U, lightweight, portable, multi-fuel, self-powered heater that operates outside military tents and provides forced hot air recirculation via sealed, detachable, quick connect, flexible air ducts, without the need for an external power supply. The SHC 90K shall operate on diesel and JP-8 fuels and ge
16、nerate its own internal electrical power without any moving parts. Fuel ignition will be accomplished by a one-switch startup procedure on a remote control located inside the tent. The remote control will have a visual display to show heater functions and fault codes. Heater operation will include c
17、ompletely automatic safety and temperature controls as well as built-in troubleshooting diagnostics. The SHC 90K will be equipped with an internal fuel tank to provide a minimum of 15 hours of continuous operation and will have the capability to operate on an external fuel supply as well. It will ha
18、ve a protective enclosure that can withstand extreme environmental and field conditions. It will be forkliftable and have handrails/handles and wheels if required to support local movement and positioning. 3.3.1.1 Heat output. The heater shall provide a minimum of 90,000 BTU/Hr (1,500 BTU/hr) heat o
19、utput when the thermostat is not satisfied using JP-8 fuel and a maximum of 60,000 BTU/Hr (+4,000 BTU/hr) heat output with JP-8 when the thermostat is satisfied at altitudes up to 5,000 ft. Heat output shall be derated 15% at altitudes up to 10,000 ft. 3.3.1.2 Indicated efficiency. The burner system
20、 shall operate, during any temperature setting, at a minimum of 80 % indicated combustion efficiency. 3.3.1.3 Burner smoke spot. After 5 minutes of burner operation the heater shall not produce a smoke spot number greater than 3, per ASTM D2156, in any mode of operation under any identified performa
21、nce test condition. 3.3.1.4 Fuel capability. The heater shall be safely operated with all of the fuels listed in Table I at the corresponding environmental conditions, with no operator adjustments required to accommodate varying fuel types. The primary fuel will be JP-8 and the alternate fuels will
22、be K-1, DF-A, DF-1, JP-5 and DF-2. TABLE 1. Compatible Fuels Ambient Temperature Range National Stock Number Military Symbol CONUS Above +25F 9140-01-286-5294 DF-2 Above +10F 9140-01-286-5286 DF-1 Above -25F K-1 Above -60F 9130-01-031-5816 JP-8 Above -60F 9140-01-286-5283 DFA Provided by IHSNot for
23、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32424 4 3.3.1.5 Operational temperature range. The heater shall operate in a temperature range of +60F to -60F. 3.4 Fuel system. The fuel system shall permit the heater to operate continuously without flooding. The he
24、ater shall operate from either an integral fuel tank or from an external fuel supply. A fuel system diagram shall be mounted on the heater. 3.4.1 Integral fuel tank. The heater shall have an integral fuel tank of sufficient capacity to provide a minimum 15 hours (Threshold) and 24 hours (Objective)
25、of operation at maximum rated heat output. 3.4.1.1 Fuel tank material. The fuel tank shall be constructed of corrosion resistant materials or treated to provide protection against corrosion and deterioration that may be encountered in any applicable operating and storage environment. The fuel tank s
26、hall be compatible with the fuels specified in Table 1. 3.4.1.2 Fuel tank equipment. The fuel tank shall be equipped with an overflow vent, water drain, quantity gauge, a removable filler strainer, and a filler neck/cap recessed flush with the enclosure exterior surface. The fuel tank filler shall b
27、e accessible for easy fueling. The cap shall be captive to prevent loss of the cap. The captive cap shall permit unobstructed refueling of the tank. The fuel tank shall be equipped with a drain connection separated from the fuel supply line. The drain connection shall be leak proof. The fuel tank dr
28、ain shall be labeled, well-located, and protected from transportation damage and excessive heat. 3.4.2 Operate from external fuel supply. The heater shall be capable of operating from an external fuel supply. The fuel system shall permit the heater to operate continuously without flooding, with the
29、fuel container 12 inches below the base of the heater and up to 10 feet above the heater. 3.4.2.1 External fuel fitting. A quick disconnect fitting shall be flush mounted on the heater exterior for mating with an external fuel hose. 3.4.2.2 External fuel hose. A 25-foot external fuel hose shall be p
30、rovided. It shall be inch ID hose and must meet or exceed the requirements of MIL-DTL-8794, conform to SAE standards for low pressure, for fuel transfer from an external fuel supply. The fittings must meet the requirements of MIL-DTL-5070 and the hose assemblies shall meet or exceed the requirements
31、 of MIL-DTL-8795. The fuel hoses shall have an operating temperature range of 60 to +250F. The hose shall have captive protective caps. One end of the hose shall have quick disconnect fittings for connection to the heater. For connection to the external fuel supply, the other end of the hose shall b
32、e a female flare connector with the designation 5/16” JIC by ” pushlock barb. 3.4.3 Manual fuel valve. The heater shall be equipped with a manual fuel valve to permit operation from either the external fuel supply or the integral fuel tank. Provided by IHSNot for ResaleNo reproduction or networking
33、permitted without license from IHS-,-,-MIL-PRF-32424 5 3.4.4 Fuel filtering and water separation. A fuel filtering device, capable of running in a military environment, shall be incorporated to remove foreign particles-and suspended ice crystals, separate water from the fuel, and protect the fuel sy
34、stem downstream. The filtering device housing shall be clear to allow for visual inspection. The filter shall be located within a protected area and shall not break due to freezing of entrapped water. Access to the filter for service and replacement shall be simple and rapid. 3.4.5 Automatic shut-of
35、f capability. Fuel flow shall stop within 2 seconds when the heater start switch is turned to the off position or when a fault is detected by the system controller during operation. When the start switch is in the off position, and the heater is connected to an internal fuel supply, no fuel shall fl
36、ow from the filter assembly when disassembled for cleaning. 3.4.6 Residual fuel. The heater shall provide a means to drain residual fuel from the fuel system reservoir areas such as the tank, filter element, and float after operation. 3.4.7 Trapped air. Bleeding of any trapped air in the fuel line a
37、nd fuel system shall be automatic and without fuel leakage during use of internal fuel tank. An air purge mechanism shall be provided for use with the external fuel supply. 3.5 Heated air system. The heater shall provide clean, heated, re-circulated, breathable air for shelters. 3.5.1 Airflow volume
38、. The heated air system shall provide a minimum of 1000 CFM ( 100 CFM) indicated heated air at 0.50 (Threshold), 0.75 (Objective) inches water gauge when the thermostat is not satisfied using both air ducts. 3.5.2 Maximum air outlet temperature. The maximum outlet air temperature measured at the out
39、let end of the flexible duct shall not exceed 225F. The heater shall automatically shut off if the heated air at the outlet of the flexible duct exceeds 225 F. 3.5.3 Modular fan system. The blower or fan system shall be modular to permit simple removal for service or replacement. 3.5.4 Fresh air mak
40、eup. If required, the heater shall be capable of delivering fresh makeup air up to a minimum 5 percent of the total heater airflow. The fresh makeup air inlet shall be adjustable. Intakes for fresh makeup air shall be positioned to minimize the introduction of contaminated air from the exhaust openi
41、ng. 3.5.5 Air inlet and outlet openings. The air inlet opening and heated air outlet opening shall incorporate a debris and finger guard to prevent any objects larger than ” diameter from entering the enclosure. The air inlet and outlet openings shall be fitted with a rigid collar. The inlet collar
42、shall have three J-slot connectors located 120 degrees apart, and the outlet collar shall have three pins located 120 degrees apart for making connection to flexible ducts. 3.5.6 Flexible air ducts. A 10 ft. heated air supply duct and a 10 ft. return duct shall be provided. The heater ducts shall be
43、 sized for compatibility with standard shelter openings. The duct construction shall conform to AIA/NAS 1369. Attaching the ducts to the heater shall require no tools and be performed wearing anti-contact gloves NSN 8415-00-227-1220. The duct rigid collar shall have J-slot connectors located 120 deg
44、rees apart on the inlet end, and three pins located 120 degrees apart on the outlet end. The heater return air duct shall have a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32424 6 debris guard installed in the tent end of this duct assem
45、bly preventing debris larger than ” diameter entering into the duct. The outer liner of the ducts shall meet FAR 25.853 flammability requirements. The duct assembly shall meet NAS1369 Type B, Form C duct requirements. The ducts shall be stowable with the heater. The duct color shall be olive drab. T
46、he flexible air ducts shall not off-gas or create a haze with air temperatures up to 250F. 3.6 Major components. The following major components shall be provided with the heater. 3.6.1 Internal power generation system. The heater shall contain an internal electrical power generation system that is s
47、ilent, contains no moving parts, is self-contained, and requires no adjustments before, during, or after heater operation. No special periodic maintenance shall be required. The generator output wattage shall provide sufficient electrical power to operate the heater during all thermostat settings du
48、ring and after battery charging. The generator system shall have built-in “FAIL-SAFE” protection from overheating, overcharging, shock hazards, etc. The generator and related components shall be modular for ease of repair and replacement. 3.6.2 Power storage battery. The power storage battery shall
49、be mounted to the heater and shall not require installation or removal when the heater is in use or being transported. It shall be included in the overall weight of the heater. The battery shall be replaceable by one person within 15 minutes. The battery shall have a minimum storage life of two years. 3.6.2.1 Battery safety. The battery shall be fuse protected within the battery case. The fuse holder(s) shall
